LG 50pa5500 plasma clicks twice wont power on

[mc25a]

Hi everyone,

I have an lg plasma tv model 50pa5500 (2 1/2 years old) that suddenly stopped working. We turned it on as usual. There was a loud pop, and it cut off. I went right to it but did not notice any smell or see any smoke. Now it clicks once when you turn it on followed by a second click a second or two later. No picture or sound.

The capacitors look normal, I can't see anything that looks like an obvious failure. I've been looking at some common failures for these on this board. Thanks ahead of time for the great resource.

Also in the picture I do realize that the power connector is unplugged from the power supply. I did this after I opened it up just to make sure the kids didn't plug it up and mess with it.

[paulstef]

Re: LG 50pa5500 plasma clicks twice wont power on

1. remove the upper right connector . Try to turn on, do you have VS, VA 5V?
2. Remove the lower right connector, power the PSU unit, does it turn on and stays on? If yes connect the cable again and measure M_ON, RL_ON, STBY, 5.2V. Post the results here.

Check all fuses and bigger semiconductors on this board for shorts.

[mc25a]

Re: LG 50pa5500 plasma clicks twice wont power on

Thanks for the quick reply. When I unplug the upper right connector the tv clicks on once and stays on.

VS is 204, VA is 53, m5v is 5.17

With both of them unplugged it also turns on and stays on. If I plug in the upper and remove the lower it wont stay on.

With both out I get the following voltages:
M_ON = 4.00
RL_ON = 4.85
STBY = 5.17
5.2V = 5.18

Thank you for your help

[mc25a]

Re: LG 50pa5500 plasma clicks twice wont power on

Also if I plug everything back up to the P.S. but remove the connector from the zsus to the ysus it comes on and stays on with a noticeable hum from the ysus

[mc25a]

Re: LG 50pa5500 plasma clicks twice wont power on

Any other ideas on this one?