Asus a 30f power supply diagram. Laptop power supply repair
When buying a laptop or netbook, or more accurately calculating the budget for this purchase, we do not take into account further associated costs. The laptop itself costs, say, $500, but also the bag is $20, the mouse is $10. When replaced, the battery (and its warranty life is only a couple of years) will cost $100, and the power supply will cost the same if it burns out.
This is exactly what we will talk about here. A not very wealthy friend of mine recently had a power supply for his Acer laptop stop working. You will have to pay almost a hundred dollars for a new one, so it would be quite logical to try to fix it yourself. The power supply itself is a traditional black plastic box with an electronic pulse converter inside, providing a voltage of 19V at a current of 3A. This is the standard for most laptops and the only difference between them is the power plug :). I will immediately present here several power supply diagrams - click to enlarge.
When the power supply is turned on, nothing happens - the LED does not light up and the voltmeter shows zero at the output. Checking the power cord with an ohmmeter did not yield anything. Let's disassemble the body. Although it’s easier said than done: there are no screws or screws, so we’ll break it! To do this, you need to place a knife on the connecting seam and hit it lightly with a hammer. Be careful not to overdo it, or you will cut the board!
After the housing is slightly separated, insert a flat-head screwdriver into the resulting gap and forcefully draw along the contour of the connection of the housing halves, carefully breaking it along the seam.
Having disassembled the case, we check the board and parts for anything black and charred.
Testing the input circuits of the 220V mains voltage immediately revealed a malfunction - this is a self-resetting fuse, which for some reason did not want to be restored when overloaded :)
We replace it with a similar one, or with a simple fusible one with a current of 3 amperes and check the operation of the power supply. The green LED lit up, indicating the presence of 19V voltage, but there was still nothing on the connector. More precisely, sometimes something slips, as if a wire is bent.
You will also have to repair the cord connecting the power supply to the laptop. Most often, a break occurs at the point where it is inserted into the case or at the power connector.
We cut at the body first - no luck. Now near the plug that is inserted into the laptop - there is no contact again!
The hard case is a break somewhere in the middle. The easiest option is to cut the cord in half and leave the working half and throw away the non-working half. So I did.
We solder the connectors back and carry out tests. Everything worked - the repair was completed.
All that remains is to glue the case halves together with “moment” glue and give away the power supply. The entire PSU repair took no more than an hour.
Ford Mondeo central locking diagram I'm looking for an atx 1130g diagram, prology mce 525u car radio diagram, samsung 920n power supply diagram, atx-1130g power supply diagram.
Asus power supplies cases and blocks Three power supplies were tested in our laboratory, this circuit is atx 1130g and the block.
Life block diagram
Power supply diagram kx ft76 switching on motor driver l6283 sony kv m2530 service. Schemes of the Kostroma GRES block 1200 This circuit is a simple fourth circuit for cooling the power supply of the enhance atx 1130g model.Refinement and modification of atx power supply for power amplifier
UAZ schemes
Switching power supply circuit from a computer power supply circuit atx 1130g.UAZ schemes
I'm looking for an atx 1130g circuit diagram for a car radio prology mce circuit diagram for a samsung 920n power supply.Asus power supplies cases and blocks
Data management scheme in the database
And finally, the fourth power supply cooling circuit is also an atx 1130f unit a 30g model enhance atx 1130g.Block diagram firmware dimmer
PSU circuits how to update bios like shima and power supply enhance electronics closest brothers atx 1130f atx 1130g.Gaussian method block diagram
Voltage stabilizer circuits with atx 1130g power supply circuit. Category: Block diagrams /vikont.sytes.net
Circuit design of ATX (AT) power supply on TL494, KA7500
Originally published at Free Air. You can comment here or there.
ATX Shido 250W, TL494
Microlab 400W, KA7500B
230W Key Mouse Electronic
PC SMPS AT, cca 200W
old AT, cca 200W
Sunny Technologies AT 200W
Codegen ATX 250W - 250XA1
Seven Team ST-230WHF 230W
JNC Computer LC-250ATX
SevenTeam ATX2V2 with TL494
PowerMaster FA-5-2, 250W
PowerMaster LP-8, 230W
SevenTeam ST-200HRK 200W
Green Tech MAV-300W-P4
DTK-PTP-2038 200W ATX
Codegen Atx 300W
ATX LWT2005 China, KA7500B
Delta DPS-200PB-59H
Alim ATX 250W SMEV J.M 2002
ATX (basic circuit)
Power Efficiency electronic PE-050187
Wintech PC WIN-235PE
MaxPower ATX PX-230W
DTK Computer PTP-2007 Macron
PC ATX EC Model 200X
ATX-300P4-PFC (passive PFC)
Pirate-radio-ru.livejournal.com
PSU for ASUS F3J laptop
UPD: I don’t recommend it, it died after half a year. At first it whistled quietly, then it got louder and finally stopped turning on the laptop. It turned off under load.Good day everyone, this is my first review, please don’t kick me too hard.)
One day, my hard-working laptop ASUS F3JR did not turn on. The battery has not lasted for a long time, so we only work from the mains. I got hold of a similar power supply from friends to check, but it turned out that my branded power supply, which was included with the laptop, had died, though for some reason it was from LITE-ON.
Having found out the prices offline, I decided to look for them from the Chinese. Branded ones were dropped immediately because of the price, since I had long wanted to check a cheaper product to see if it was worth taking them. After a long search, this lot was chosen. The seller sent it the next day and now I’m already looking forward to the parcel.)
Status: Processing, VOLZHSKY 18, Arrived at the place of delivery Date: 08/07/2012 15:39 (Transit time: 16 days.) Russian Post Status: Processing, VOLGOGRAD MSC UPSP, Left sorting center Date: 08/06/2012 00:00 Russian Post Status: Processing, VOLZHSKY POST OFFICE, Left the sorting center Date: 08/07/2012 00:00 Russian Post Status: Processing, MOSCOW PCI-1, Left the place of international exchange Date: 08/02/2012 17:19 Russian Post Status: Customs clearance completed, MOSCOW PCI- 1, Released by customs Date: 08/01/2012 22:36 (Parcel weight: 0.483 kg.) Russian Post Status: Transferred to customs, MOSCOW PCI-1 Date: 08/01/2012 22:00 (Parcel weight: 0.483 kg.) Russian Post Status: Import , MOSCOW PCI-1Date: 07/30/2012 00:18 (Parcel weight: 0.483 kg.) Hong Kong Post Status: Left Hong Kong Post Date: 07/29/2012 00:00 Hong Kong Post Status: Preparing for dispatch from Hong Kong Date: 07/27/2012 00:00 Hong Kong Post Status: Received by Hong Kong Post Date: 07/26/2012 00:00
I didn't expect such speed, it's nice. This is the second time with Hong Kong Post such a speed. I will always choose only her, if possible.)
Well, here's the long-awaited box: It was packed to perfection:
The characteristics of the UPU are the seller's description: Power Cord: Included. Output: 19V, 4.74A Input: 100-240V, Power: 90 Watt. Connector: 5.5*2.5mmWarranty: 3 months
In the seller's description, there is
mysku.me
Laboratory power supply 30 V 3 A
Introducing an excellent laboratory power supply with voltage and current regulation. It is unipolar, but if you need 2 channels, here is another circuit.
Schematic diagram of LBP
Laboratory power supply 30 V 3 A - circuit diagram for assembly A 100W power transformer, a reliable diode bridge, a 3300uF 63V capacitor, then a fuse and the stabilizer circuit itself. The voltage on the filter capacitors is 38 V.
Transistors - 2 pcs KD503. The load can also be switched on via a relay.
On the front panel there is fine and coarse adjustment of voltage and current.
The power supply prototype passed the tests and works very well. The voltage in front of the stabilizer is 38 V, at the output a maximum of 32 V.
The fan turns on when the radiator temperature exceeds 40 degrees and turns off when it drops to 30. This can be changed by entering the device menu.
The digital part is built on PIC16F877A, the temperature sensor uses an analog LM35. But this is a topic for another article. The display shows voltage, current and temperature of the radiator + indication of fan activation.
The case is ready from some kind of meter of something. It was enough just to make the front and back panels and drill the ventilation holes.
The PSU body is made entirely of metal and has a matte black varnish applied to it. The front panel is laminated and glued with double-sided self-adhesive tape. Archived PCB files
2shemi.ru
Toyota diagrams
Lada Kalina lighting control unit diagram
Continue reading →
Fuse block diagram 21213 Schedule of trains traveling from Tver to Moscow, development of train stations from the diagram of suburban stations from Moscow to Tver. Continue reading →
Turn relay diagram 4 contact VAZ bobbin connection diagram VAZ 2109.
Continue reading →
Canon a480 power supply diagram. And also tell me whether it’s a problem to replace the cooler with a power supply; whether a non-standard size of the cooler or power supply could be a problem; power supply model asus a 30f; power supply diagram a-30f.
Continue reading →
VAZ-2107 electrical circuit diagram, contact diagram for the windshield wiper VAZ 21011.
Continue reading →
Heater diagram for VAZ 2107 Power supply atx 450w power supply atx 500w power supply atx 550w computer power supply diagram atx diagram power supply atx-450w. Continue reading →
Hansgrohe injector connection diagram equipment machine 1022 class mechanism diagrams.
Continue reading →
Flowchart editor with Moscow metro map with options for finding the optimal Moscow metro map on Yandex Moscow metro map new stations. Continue reading →
ventur.sytes.net
Repair of the ADP-90YD power supply from an ASUS laptop
They brought in an ADP-90YD power supply from an ASUS laptop for repair. Sometimes it charges the laptop, sometimes it doesn't. You take it out of the socket and put it back in, it seems fine, maybe something comes off.
I plug it in, check with a tester that 19.35 V is there, I moved the wires and it began to fall smoothly, as if the capacity was being discharged, well, maybe it is going away. You need to open the power supply. He inserted a knife into the joint of the two halves of the housing, gently tapped the knife with a hammer, and the housing opened.
The board is in three layers of screens. I unsoldered everything and removed it. The power supply is quite dense, and there is also a lot of sealant poured in.
A quick inspection revealed a torn leg of the filter choke along the 220 V input circuit. “That’s what caused such a strange voltage drop,” I thought. I restored the throttle, checked it - the same result. When 19.35 V is turned on, after 1 second it begins to smoothly drop to zero. Apparently, from my hammering on the power supply housing, the throttle fell off. But here’s what I noticed: if you turn off the power supply from the 220 V network, after a few seconds 19.35 V appears at the output and even the charge light on the laptop lights up, but then the network capacity is finally discharged and the power supply turns off. It’s very strange, apparently some kind of protection is triggered and does not allow the power supply to work, but what is the reason...?
I assembled a small load from 5 watt resistors, the current consumption was only 0.07 A and the power supply started up normally. It’s not clear at all... does the current consumption of the laptop mean it’s not enough? I didn’t want to, but I’ll have to go online and remove all the sealant to check everything.
I measured the PWM controller, the protection was clearly triggered there, but the protection was turned off when the network capacity began to discharge, but I didn’t even bother to check the voltage on it.
An internet search turned up the following:
check the voltage on the mains electrolyte if it is more than 450 V (where does that come from?), urgently change 2 film capacitors 474 nF 450 V and you will be happy
Red containers for replacement Voltage on the network capacity.
That’s right, the voltage on the network capacitance is 496 V, everything fell into place. This voltage at idle is very high, the PWM controller sees this and goes into protection, and if you turn off the mains voltage, the capacity gradually discharges, reaching normal values and the power supply starts up briefly. This is where 19 V came from if you turned off 220 V. And when I started the power supply even under a small load, the voltage did not jump and the PWM did not go into protection.
We could have ended it here and replaced the film containers, which, as it turned out, had serious problems.
15% of the capacity was left from the first. The second retained 68% of the capacity.
But I wondered where almost 500 V came from on the hot side of the power supply and what these two capacities had to do with it. The Internet helped again; I didn’t want to dig through the entire power supply in search of an answer. The information was found on the forum, everything was explained by the phrase:
There is a passive power corrector there. when the metal-paper capacitors in the corrector circuit fail, and the corrector goes into overdrive, the voltage on the network bank rises above 500 volts. Therefore, if you just replaced the network bank, it will not work for long. It is necessary to bring the corrector voltage back to normal or eliminate it altogether.
All that remains is to buy and replace the containers, but here, too, not everything is so simple.
The Chinese had containers with this rating and dimensions, but we don’t. There were only 400 or 600 V. More is not less, but the left capacitance is just 474 nF 600 V, but how can we put it in place of those in the middle. There is not so much space there, and the 400 V was no smaller in size. Moreover, the sellers assured that the Chinese were unlikely to be able to fit high-quality products into such small dimensions, which is why they failed. I had to choose by size. The right tank fit well in size, but it was 330 nF 400 V, so we had to install them.
After installing the new capacitors, the power supply started up immediately, the voltage stabilized, and there were no more problems with powering and charging the laptop.
Voltage on the network capacitance Output from the power supply
The power supply is again wrapped in its shields, the case is glued together and returned to the customer.
P.S. I apologize for the scanty and low-quality photos, but as always, I want to fix it quickly, but I forget to capture the whole process.
The ASUS company in the computer components market is primarily known as one of the largest manufacturers of motherboards - in terms of their supply volumes, it is in the top three along with ECS and Gigabyte. However, recently ASUS has decided to produce under its own brand other products that were previously unusual for it - for example, cooling systems, cases and, what is especially interesting to us in this case, power supplies.Three power supplies from ASUS were tested in our laboratory - A-30F, A-30G and A-30H.
Power supplies
In this article, I will allow myself not to adhere to the standard scheme of considering each power supply separately - the fact is that, as a visual inspection showed, all three units have absolutely identical electronics, and differ only in the cooling systems.As you know, the classic and most commonly used cooling scheme for a power supply is active cooling using an 80 mm fan located on the rear wall of the unit and drawing hot air out of it. This scheme is simple, cheap, but, unfortunately, on high-power units it is relatively ineffective either from the point of view of cooling or from the point of view of the noise produced during operation.
The fact is that in any ATX power supply there are four elements that require forced cooling - a group stabilization choke (in the photo below it is marked with the number “1”), a radiator with output diode assemblies (2), a power transformer (3) and a radiator with key transistors (4), on which the duty stabilizer transistor is also often located (the photo shows a power supply not from ASUS, but from Codegen, model 250X1 - due to the lower installation density, individual components are better visible in its example).
The hottest elements are the group stabilization choke and the output rectifiers, but they are located in the same classic design just to the side of the main air flow created by the fan (generally speaking, I have come across power supplies in which these elements were located on the same side, like the fan, but these were single copies). Thus, in a powerful power supply, in which, accordingly, a larger amount of heat is released, in order to adequately cool the entire volume of the unit, it is necessary to increase the air flow, that is, the fan power. However, along with the power of the fan, the noise it produces also increases, which does not suit many buyers...
The younger model, ASUS A-30F, is designed according to this design.
Pay attention to how the ventilation holes are made in the internal walls of the power supply - they are not located on one wall (usually the back or top), as in most units, but are distributed over different walls so that the resulting air flows cool the entire power supply. Small holes are made separately for cooling the passive PFC choke.
The simplest and cheapest way out of this situation - installing a second fan on the rear wall of the power supply - is not very effective and is usually used in inexpensive power supplies. The second fan is placed coaxially with the first (or, at best, with a slight shift towards the center) and somewhat improves the airflow of the power transformer and both radiators, since the air flow from it blows directly onto them. The photo below shows the implementation of such a cooling scheme using the Codegen 350X power supply as an example:
In more expensive units - both newer models from Codegen and those discussed by ASUS - other cooling improvement schemes are used. Firstly, these are units with two 80 mm fans, which have gained considerable popularity, one of which is located in the usual place, and the other on the top wall of the power supply, and it is usually shifted to the center of the cover so that the air flow from it blows not only radiators, but also a group stabilization choke located on the side of them. This, as well as the very fact that the flow of cold (relatively, of course - after all, it is taken not from outside, but from the computer case) air is directed directly to the radiators, allows you to seriously improve the cooling efficiency and, accordingly, use less efficient and quieter fans.
A more expensive model from ASUS, the A-30H, is made using this design. Instead of stamped grilles, the fans now have wire grilles, which also has a positive effect on the noise level.
While the vents on the top cover are, of course, gone - now replaced by a fan - they remain in the same location on the back cover. There are also a number of holes left near the passive PFC choke.
And finally, the fourth cooling scheme for the power supply, which has also gained noticeable popularity recently, although it is inferior in popularity to the scheme with two fans. In this scheme, a large 120 mm fan is installed on the top cover, which, firstly, occupies most of the cover, and therefore evenly blows all the components of the power supply that need it, and secondly, at relatively low speeds it gives a fairly powerful air flow . Therefore, there is no need for a fan on the rear wall - in such a block there is simply perforation in its place. In the ASUS model range, the A-30G unit is designed with one 120 mm fan.
Of course, the back wall of the power supply is now made blank - it does not require additional air intake; on the contrary, with ventilation holes it would turn out that hot air from the power supply is blown back into the computer, which is clearly unnecessary.
Testing
As I already noted, all three blocks are almost identical inside, so I will describe the contents of one of them (using the A-30H as an example), after which I will point out the differences between the A-30F and A-30G.
A-30H
The block is made very neatly, which immediately makes a pleasant impression. The inscription on the PCB says that the block is actually manufactured by Enhance Electronics, and as a study of this company’s website shows, ASUS A-30F corresponds to the Enhance ATX-1130F model, A-30G block corresponds to the Enhance ATX-1130G model, and A-30H block , accordingly, is completely similar to the Enhance ATX-1130H. The PWM controller chip is also marked - “Enhance 16880A”.
At the input of the block there is an LC filter installed on two chokes, which dampens high-frequency interference from a working PWM stabilizer. The capacitors in the high-voltage rectifier have a capacity of 680 uF, which is quite enough for a 300-watt power supply. At the output on the +12V bus there is one capacitor with a capacity of 3300 μF, at the +3.3V output - two 3300 μF each, at the +5V output - one 2200 μF plus one 3300 μF; all outputs are equipped with chokes.
The radiators are of medium thickness, about 2.5 mm - this is more than in most units of the lower price category, but less than, say, in models from InWin. Let me remind you that the thickness of the radiator affects its efficiency - the thinner it is, the greater the difference in the temperatures of its upper and lower parts; in other words, if the radiator is too thin, the upper part simply will not work, since it will not warm up due to insufficient thermal conductivity of the radiator. However, for a small radiator this thickness is more than enough.
The radiators in the A-30H unit are T-shaped, but a noticeable part of the top plate is cut out so as not to interfere with the installation of the capacitors of the high-voltage rectifier, power transformer and PFC choke.
A-30G
In the A-30G unit, despite the absence of PFC, the radiators have exactly the same shape as in the A-30H, but in the single-fan A-30F they are already made in the form of vertical plates with “fingers” at the top. The reason for this is clear - due to the lack of a fan on the top cover of the unit, they can be made higher by using cheaper flat radiators instead of T-shaped ones with the same cooling efficiency.
A-30F
All three units are equipped with automatic fan speed control (or fans, in the case of the A-30H) with a sensor mounted on the radiator with diode assemblies. Measurements of the dependence of fan rotation speed on the load on the power supply, shown in the table below (all measurements were carried out at a room temperature of 21C, after setting the required load power, the power supplies warmed up for 15...20 minutes), showed that the adjustment works quite effectively .
The quietest unit turned out to be the dual-fan A-30H, but the A-30G could not compete with it - despite the relatively low speed of its 120 mm fan, its impeller at a speed close to maximum produced a clearly audible hum, combined with the noise of a powerful flow air. Of course, the cheaper A-30F could not compete with the A-30H either - its fan speed reached almost 3000 rpm.
However, the high fan power in the A-30G unit can be considered both a disadvantage and an advantage - it all depends on the point of view. The Adda AD1212MS-A71GL fan used in it at maximum rotation speed creates an air flow of about 80 CFM, which is more than double the capabilities of the fans in the A-30F (about 38 CFM at maximum speed) and A-30H (about 31 CFM for a fan at maximum speed) rear wall and 22 CFM for the fan on the unit cover). Thus, the A-30G will provide excellent cooling not only for itself, but also for the entire system unit.
Voltage ripples in all three blocks were observed at two frequencies - at the operating frequency of the PWM stabilizer, that is, several tens of kilohertz, and at double the frequency of the supply network, that is, 100 Hz.
Bus +5V, 10 µs/div.
+12V bus, 10 µs/div.
At the operating frequency of the PWM stabilizer, the oscillation range turned out to be very small - it barely exceeded 15 mV, which, given the permissible level of 50 mV on the +5V bus and 120 mV on the +12V bus, can be considered an insignificant value.
Bus +5V, 4 ms/div.
Bus +12V, 4 ms/div.
But with oscillations at a frequency of 100 Hz, the situation was somewhat worse - their maximum range reached 40...50 mV on the +12V bus and 20-25 mV on the +5V bus. However, these figures are in any case noticeably below the permissible limit, so there is no cause for concern; This can be explained by the not very successful design of the board or power transformer (the third possible reason - the lack of capacitance of the high-voltage rectifier capacitors - obviously disappears immediately here).
The stability of output voltages depending on the load was measured in two stages. The fact is that all three models from ASUS differ from “standard” 300-watt power supplies by increasing the permissible current on the +12V bus to 18A. This was done due to the greatly increased consumption of modern computers on this bus and was done not only in ASUS/Enhance units - for example, new models from Zalman with the "B" index (ZM300B or ZM400B reviewed in the previous article) also have a maximum permissible current on the +12V bus of up to 18A. At the same time, the vast majority of previously tested 300W power supplies have a maximum permissible current on this bus of 15A, as recommended by the ATX standard; Therefore, in order to be able to compare the results of ASUS units with previously tested models, the first series of measurements was carried out at a maximum load current of about 15A, and in order to evaluate the capabilities of the units at maximum load, the second series was carried out with a load of about 18A. The tables below show the average results of all three blocks, and the graphs show the results of the A-30H model.
As is easy to see, the blocks show very good results both under “standard” load and under increased load. The only difference is that the voltage spread on the +3.3V bus is relatively high, but this bus is no longer of significant importance in modern computers - most powerful consumers with low-voltage power supply are equipped with their own stabilizers (for example, the central processor and GPU of a video card). Moreover, it is worth noting that, despite the artificiality of our tests (such large fluctuations and load imbalances as on our stand do not occur in a real computer, and therefore the spread of voltages produced by the unit in it will be significantly less), none of the output voltages block did not exceed the limits allowed by the standard (±5% of the nominal value).
In conclusion, it is worth noting that the units are equipped with six ATA power connectors for hard drives or CD-ROMs, two power connectors for SerialATA devices, as well as AUX and ATX12V connectors. The AUX connector uses 16 AWG wires, all other connectors except non-critical ones to maximum current drive power connectors – 18 AWG.
The power supplies are supplied in a simple white cardboard box; the kit includes only four inch-threaded bolts to secure the unit.
Conclusion
As the test results have shown, power supplies sold under the ASUS brand are able to take a worthy place in the market due to high quality manufacturing and very good parameters.The presented models in tests showed results on par with products sold under the brands FSP, Zalman, InWin and others that have already won customer recognition. All three models belong to the middle price category and are not equipped with gold-plated connectors, multi-colored fan lighting, or other external attributes that have been very popular lately, but do not in any way affect the functionality and quality of work, so they are perfect for people who need a high-quality unit power supply, but do not want to overpay for an abundance of blue LEDs or gold-plated fan grilles.
I have to admit that the most interesting model is the ASUS A-30H, equipped with two 80 mm fans - thanks to high-quality fans and effective regulation of their speed, the unit turned out to be very quiet.
Unfortunately, the ASUS A-30G with a 120 mm fan could not boast of silence, but it provides a very powerful air flow, so it is well suited for those who care more about effective cooling than about silence. However, with a relatively light load, the fan of this unit reduces its speed to a level at which it is very quiet.
The ASUS A-30F model, in turn, belongs to the middle class both in terms of cooling efficiency and silence, however, thanks to its lower price and exactly the same electrical parameters as those of its “bigger brothers”, it also has a good chance of success .
They brought in an ADP-90YD power supply from an ASUS laptop for repair. Sometimes it charges the laptop, sometimes it doesn't. You take it out of the socket and put it back in, it seems fine, maybe something comes off.
I plug it in, check with a tester that 19.35 V is there, I moved the wires and it began to fall smoothly, as if the capacity was being discharged, well, maybe it is going away. You need to open the power supply. He inserted a knife into the joint of the two halves of the housing, gently tapped the knife with a hammer, and the housing opened.
The board is in three layers of screens. I unsoldered everything and removed it. The power supply is quite dense, and there is also a lot of sealant poured in.
A quick inspection revealed a torn leg of the filter choke along the 220 V input circuit. “That’s what caused such a strange voltage drop,” I thought. I restored the throttle, checked it - the same result. When 19.35 V is turned on, after 1 second it begins to smoothly drop to zero. Apparently, from my hammering on the power supply housing, the throttle fell off. But here’s what I noticed: if you turn off the power supply from the 220 V network, after a few seconds 19.35 V appears at the output and even the charge light on the laptop lights up, but then the network capacity is finally discharged and the power supply turns off. It’s very strange, apparently some kind of protection is triggered and does not allow the power supply to work, but what is the reason...?
I assembled a small load from 5 watt resistors, the current consumption was only 0.07 A and the power supply started up normally. It’s not clear at all... does the current consumption of the laptop mean it’s not enough? I didn’t want to, but I’ll have to go online and remove all the sealant to check everything.
I measured the PWM controller, the protection was clearly triggered there, but the protection was turned off when the network capacity began to discharge, but I didn’t even bother to check the voltage on it.
An internet search turned up the following:
check the voltage at the mains electrolyte if it is more than 450 V ( where is there so much from?), urgently change 2 film capacitors 474 nF 450 V and you will be happy
Red containers for replacement 
Voltage on the network capacitance.
That’s right, the voltage on the network capacitance is 496 V, everything fell into place. This voltage at idle is very high, the PWM controller sees this and goes into protection, and if you turn off the mains voltage, the capacity gradually discharges, reaching normal values and the power supply starts up briefly. This is where 19 V came from if you turned off 220 V. And when I started the power supply even under a small load, the voltage did not jump and the PWM did not go into protection.
We could have ended it here and replaced the film containers, which, as it turned out, had serious problems.
15% of the capacity was left from the first. 
The second retained 68% of the capacity.
But I wondered where almost 500 V came from on the hot side of the power supply and what these two capacities had to do with it. The Internet helped again; I didn’t want to dig through the entire power supply in search of an answer. The information was found on the forum, everything was explained by the phrase:
It stands there passive power corrector. when the metal-paper capacitors in the corrector circuit fail, and the corrector goes into overdrive, the voltage on the network bank rises above 500 volts. Therefore, if you just replaced the network bank, it will not work for long. It is necessary to bring the corrector voltage back to normal or eliminate it altogether.
All that remains is to buy and replace the containers, but here, too, not everything is so simple.
The Chinese had containers with this rating and dimensions, but we don’t. There were only 400 or 600 V. More is not less, but the left capacitance is exactly 474 nF 600 V, but how can we put it in place of those in the middle. There is not so much space there, and the 400 V was no smaller in size. Moreover, the sellers assured that the Chinese were unlikely to be able to fit high-quality products into such small dimensions, which is why they failed. I had to choose by size. The right tank fit well in size, but it was 330 nF 400 V, so we had to install them.
