Re: LG 42LE5900 PSU issue

The TV works, the loud buzzing is a bit concerning though..

Using the menu system or displaying anything white increases the load enough to make the buzzing really quite loud.

If you power it up with the back off, the noise does seem to be located around the pair of (what I assume are) inductor coils- labelled 10S-LP01 B. Though it could equally be from the large voltage regulator under the adjacent heatsink..

I've recently inherited an LG 42LE5900 via a friend; who got it off a colleague who upgraded to something better.

Unfortunately, having powered it up there is a loud buzzing noise from the power supply – increasing when there is a increase in the load on the PSU.
I've cracked it open, the caps on the front side all look fine, the output voltages are okay etc; but that's as far as I can get with the LG service manual - which doesn't cover the power board…

Looking at the back of the board, it looks like one of the surface mount diodes may have overheated....

Re: New Members - please post your introductions here

Hello All,

I'm looking for some advice troubleshooting a faulty tv power supply from a TV I've inherited.