[Help] LG 49LH570T Random Shutdowns

[manubali]

Hi, i was wondering if anyone can help me troubleshoot LG 49LH570T tv, initially it came for no power issue, but after leaving everything unplugged overnight, it started working in the morning when i was about to start diagnostics process.
It will turn on for 10 minutes and will die afterwards, and when i try to turn it on, a solid red LED will come up for few seconds, followed by two short blinks and then it completely shutdown, i have examined power supply and main board for visible damage or shorts, but its all fine.
The power supply PCB number is EAX66851401 REV 1.0.
One thing that i have noticed is that PSU makes hissing noise constantly

[Storyteller12]

Re: [Help] LG 49LH570T Random Shutdowns

Sounds like the caps may be bad. You can try heating them with a hair dryer next time it won’t turn on and see if it works Or if you have esr tester

[nomoresonys]

Re: [Help] LG 49LH570T Random Shutdowns

Look over the solder joints of powerboard very closely, reflow any that look suspect just in case, can search bad solder joints to see images if needed.

[nomoresonys]

Re: [Help] LG 49LH570T Random Shutdowns

Sounds like the caps may be bad. You can try heating them with a hair dryer next time it won't turn on and see if it works Or if you have esr tester

+10, heat m up see if tv stays on longer.

[manubali]

Re: [Help] LG 49LH570T Random Shutdowns

Fixed, After checking for cold/broken solder joints and hair dryer method, i focused on main board, and reflowing XD engine (LGE2111A-T8) BGA chip fixed the issue.
Thanks everyone.

[nomoresonys]

Re: [Help] LG 49LH570T Random Shutdowns

Glasd to hear it, if you can get a fan blowing on your bga it will last a lot longer.