To begin the repair process, I found and removed four bulging capacitors. Once they were out of the way, I could see a severely burned area on the pc board.
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Re: Lc-b350atx
To begin the repair process, I found and removed four bulging capacitors. Once they were out of the way, I could see a severely burned area on the pc board. -
Re: Lc-b350atx
Guess that my post did belong here then haha, I asked do you know how to check for S/C ?Leave a comment:
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Re: Lc-b350atx
Sounds like a short on one of the outputs. Measure the resistance between ground and each of the 12V, 5V, 3.3V pins.
Here is a circuit diagram:
http://electro-tech.narod.ru/schemat...y-b200-atx.gifLeave a comment:
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Lc-b350atx
Today I have a L&C antique, Model LC-B350ATX. With power applied, the 5vsb comes up. But when I turn the ps-on switch on, I get a fan twitch and a growl.Attached Files -
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So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.
In the process of poking around, I also lost a zener diode that stabilize the voltage coming from... -
Hi,
Finally replaced all of the shorted 4148's and resistors and an blown tl431 on my FSP300-60GTF after 5VSB going crazy and destroying it self. Those components also made the secondary transistors appear shorted (while in reality they weren't).
Powered it on through my dim bulb tester and they (bulbs) only flash once meaning primary caps are getting charged, but that's it. No 5VSB, PS_ON voltages.
I am sure I have replaced the components correctly and that there weren't any shorted/blown traces left.
Any ideas where to go next? -
Hello...
I got my self a dead CM V700 PSU, with nothing on +5vsb
I have tried to fix it for the past 2 week, and I'm stuck... so i guess i post it here to get some pointer before i scrap it..
As you can see in photo, the psu still pretty clean, no visible damage or bulging cap.. when i got it, it still has CM seal on it
The +5vsb system use ICE2QR4765, I have trace and measure the voltage on ICE2QR4765 and the only voltage reading i got is in VCC 4.8v, Drain 310v and FB 3v.
I have read the datasheet and and still can not... -
Rescued this one
Started it up in the computer case, and noticed that it would shut down after about 10s in the BIOS
Took it out, connected to hard drive and it loses all power on all rails (except for 5VSB) after about 40s or so. (the same result happens without a hard drive connected)
The 5VSB drops to 2.5V when it 'shuts down'
And the voltage across the primary cap falls from 335V to 330V at the same moment
I think that the 5VSB is regulated by an A6069H PWM chip (which was initially dropping to 2.5V even before the the PS-ON was grounded - but it now stays at... -
Hey there guys. I've got a Corsair power supply that's come across my bench dead. I usually don't mess with power supplies, but it's a slow week so I'm giving it a whirl.
Taking it apart I heard a screw rattling around inside, and when I got it apart I found a couple blown components near what I think is the 5VSB area.
There's a 22ohm resistor that's melted and open, but it still has the bands.
The other part is a zener diode and it's top went to jesus, so I can't read the marking.
It looks like the diode connects the source and drain of a TNY284...
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