Repair SMPS PC (for example, JNC SY-300ATX)

Repair and modernization

Hello everyone, this is an article about repairing SMPS PC.

theories will not, because it's not the topic of the article, but I will say to themselves that if you start to repair

something with their hands, then the whole theory with practice. (That alone should podchitat, the other does

not know.)

And here we go.

Was I my favorite kompik, stump 4. I decided to turn it on, that would be sure to check out electronics-lab.ru,

well and decide what to write this in the first contest, and all that I have heard so it's a shot and the smoke from

the case. =)

I just would not have burnt motherboard, and that overhead costs are financial. Looked closely and figured it

was the PSU. Since the money for a new PSU had decided to get experience in the repair.

And so, digression aside, go to practice. Chassis Intrusion BP: Start checking, especially paying attention to

the damaged, discolored, blackened or burnt parts. 1. a little glass of fuse blown fuse faulty input rectifier

diodes or transistors or key scheme standby (I have lost all :) probably from old age) 2. Blown Transistor

c5027s, ripped body: 3. Blown (blown) transistor C945 (duty room) 4. Bulging capacitors 470Mf 10V, 16V

1000Mf (output filters and duty room) 5. No photo, but I will say that burned optocoupler 817 (duty room). 6.

Blown bridge rectifier (diode). Diodes must be rated for 4 to 8 amps. 2A diodes found in cheap blocks, just

Capacitors High-voltage and low-voltage capacitors, development and production

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change it to something more powerful. Well, sort of all. :) repair itself: I started out replacing burned.

Capacitors - 470Mf 10V - 16V 1000Mf - transistor c5027s for s3150 (from another PSU) - transistor C945 for

the same (unsoldered from the board burned UPS) - optocoupler 817 for the same - replaced the fuse

Checked-duty power to the purple wire +5 VSB (all ok) then start closing the PSU +5 VSB to the black wire, it

worked cooler whirred and appeared full range of +5 V on a red, a yellow +12, +3.3 on the orange wire.

Modernization: - Replace the jumper on the throttle - burned the bridge diodes KBL406 - dopayal missing

varistor 472 2KV - spread his fins - greased with silicone oil cooler (now runs very quietly) Tested resistors,

diodes, etc. piping nothing else burned. soldered-line filter capacitor ( not pictured.) I also want to replace the

discrete diodes rectifier modules (to improve performance PSU). I also want to add that I'm after a bit carried

away by repairing the PSU. And what an interesting time to see, so that's what I'm living in rural areas, and

transformers and other electrical filling our supply area still from the Soviet era. In short, poor quality 170-270

volt electricity, etc. :). I caught about 8 power supplies, which were swollen capacitors (signs of someone like,

restart the PC does not turn on, constantly flew in 1-2 days well, windows, etc.) resolder and it worked perfectly.

Below is a photo report.

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