Re: LG LCD power supply

Actually, upon re-reading your message, I'll have to get back to you about the relay. I can't remember if I heard the relay clicking upon On/Off. Will get back to you tonight.

Re: LG LCD power supply

Yes, I hear the Relay. Upon further research and testing, I believe my problem is the PSU. Some posting I found states that both the AC Detect and 5V ST should measure 5V. My AC Detect is 0.01V. As I don't have a schematic for the PSU board and I don't know much troubleshooting, I'm relaying on the internet and support from different people, like yourself, to help me out.

If you have any thoughts on parts in the PSU that I should test, please feel free to share.

Thanks!!!

Re: LG LCD power supply

Call me crazy, but I put everything back together, except for the cover, and placed a jumper between the 5V ST and ON. The I plugged the TV into the AC outlet and the front LED came on. Then I pressed the Power button, and the TV actually came on.

Any thoughts? Do you think I still have a bad mainboard? Perhaps any hints on circuits to check? No bulged capacitors found in the mainboard.

Re: LG LCD power supply

Wrog, were you able to fix your LCD TV? I'm having the same issue as yours. I have not done as much testing as you have, but I have tested multiple components, i.e. diodes, capacitors, resistors, standby transformer, etc. by removing them and haven't been able to find the culprit.

A while back a measured 5V ST before, and I get a reading too.

No LED flashing in the TV.