Re: LG 42PJ350 Clicking PSU (TL;DR inside)
Just an update. TV is now back up and running. I replaced IC801 (L6599AD) which was overheating and now TV stays on. Ignore my standby voltage reading on fuse F302, because I was measuring from chassis ground and not on "hot" ground which is on PSU.
So in short, if you have blown Q801, Q802, check IC801 if it's overheating.
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: LG 42PJ350 Clicking PSU (TL;DR inside)
Already replaced R927 and R929. On this board they are 22 Ohms 5W. I also reflowed and added 60/40 solder to all transformer pins and elements mounted on heat sink in case of dry solder.
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LG 42PJ350 Clicking PSU (TL;DR inside)
Hello!
TL;DR: Replaced blown Q801, Q802 and fuse, but it didn't fix the problem.
I'm trying to repair this TV, since it developed clicking symptom. I disconnected Y-SUS and Z-SUS boards, but PSU was still clicking, so then I was sure problem lies in PSU. When you plug it in, you can hear 2 clicks from relay and then one click when it shuts down. I found two shorted mosfets Q801, Q802 and blown fuse F801. I replaced those elements, but it's still doing the same.
After some research, I found out resistors R108-113 need to be checked and sure one was showing...
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