LG 55LH40-UA Wont stay on

[sdubb]

Re: LG 55LH40-UA Wont stay on

Yes I did have the main board disconnected when I jumped the 5.2V to the PWR_ON

[sdubb]

Re: LG 55LH40-UA Wont stay on

What ohm resistor?

You may need to also jump the other 5.2v to the INV-ON

Okay I jumped the PWR_ON to 5.2V and the INV_ON to the 5.2V and the LCD lit up then started clicking like crazy but stayed on. I didnt let it do it very long for fear I was doing damage. Does this mean anything?

[budm]

Re: LG 55LH40-UA Wont stay on

When it shuts itself off these are the readings

0.0 NC
0.62 ADIM
0.0 NC
0.01 24V
0.0 GND
0.0 12V
0.0 GND
5.24 5.2V
5.24 5.2V
0.0 GND
0.0 GND
0.0 NC

0.01 PDIM
0.01 ERR
0.01 INVON
0.01 24V
0.0 GND
0.0 12V
0.0 GND
5.24 5.2V
5.24 5.2V
0.0 GND
0.0 GND
0.07 PWRON

Are these readings from the connector to the main board removed? If they are, the main board just went dead.

[sdubb]

Re: LG 55LH40-UA Wont stay on

So strange.
I swapped the PSU unit with the other one the previous owner had, fired it up and it worked for a good couple of minutes. I thought great I will slap it back on the wall. Put it back up and fired it started to watch a show and a few minutes later same exact thing as the old board. Shows a picture for a couple of seconds then then flashes off and on then shuts off. Does anybody know if this TV has to have a signal or it will it shut itself off quickly if no signal is detected?
Anyway thats enough playing around for the night. Good night

[budm]

Re: LG 55LH40-UA Wont stay on

It will go into standby if Video signal is not detected, some set will be in < 10 seconds, some will do it in 2~5 minutes.

[sdubb]

Re: LG 55LH40-UA Wont stay on

Are these readings from the connector to the main board removed? If they are, the main board just went dead.

Yes with the main board removed, but these reading are after the TV shuts its self off after it tries to turn on. I think that was what newtothis was asking "Can you get us the readings when its shut itself down?" unless I did it all wrong.

[budm]

Re: LG 55LH40-UA Wont stay on

Yes you did it wrong.
We need to have all the boards connected, no resistors, no force on.
We just want to see what signals or Voltages are missing when the screen goes black after the power switch is activated.
But at this point, does the TV stay on with Video signal?

[sdubb]

Re: LG 55LH40-UA Wont stay on

Well its strange, I was just going thru the menus with the remote and browsing around looking at all sorts of info that the TV had and it never turned off (good 5 mintues or so). So I hooked up my Roku and it was showing a great image. So decided to try to play a show then BAM it shut off. Powered back on with the remote and tried again to use the Roku then it shut off. Well now after waiting 5 minutes I am trying again and watching a few clips and it hasnt shut off.... wow the longest it has run going on 7 minutes... and thats it, it was fun while it lasted.
Now its back to power on, shows image, then dims, blacks out, shows image, dims, blacks out, then turns off.

[budm]

Re: LG 55LH40-UA Wont stay on

Well if we do not get those Voltages of those connector pins when the TV shut off then we will have no idea what Voltages or signals are missing, cannot help you on that without the info, it is as simple as that to start with or we can keep going round and round.