lg 46LD550

[ixiboneheadixi]

so i have this TV and it turns on but all that happens is the LED turns on but not picture on the screen and i have no idea why this is happening, i have attached some pics if that will help anyone.

[ixiboneheadixi]

Re: lg 46LD550

i've done a bit of research but all i can find is check the caps, all the caps seem to be fine to me. is there anything else i should try to do? what would cause the led light to be on but not the picture or sound to come on

[budm]

Re: lg 46LD550

I am not sure if this power supply inverter board combo has built-in pull up resistors on the PS_ON and bl_on PIN or not, so for quick test, unplug the TV from the outlet and then disconnect the cable between the power supply board and the main board, then plug the TV into the outlet to see if the backlights will come on.

[ixiboneheadixi]

Re: lg 46LD550

I am not sure if this power supply inverter board combo has built-in pull up resistors on the PS_ON and bl_on PIN or not, so for quick test, unplug the TV from the outlet and then disconnect the cable between the power supply board and the main board, then plug the TV into the outlet to see if the backlights will come on.

i disconnnected the cable from the two boards and the red LED light would not come on after i plugged it in to the wall again.

[budm]

Re: lg 46LD550

"i disconnnected the cable from the two boards and the red LED light would not come on after i plugged it in to the wall again." that is normal because we remove the power feeding the main board you removed the cable. So the backlights did not come on then?
Next we will need to test the voltages.

[ixiboneheadixi]

Re: lg 46LD550

"i disconnnected the cable from the two boards and the red LED light would not come on after i plugged it in to the wall again." that is normal because we remove the power feeding the main board you removed the cable. So the backlights did not come on then?
Next we will need to test the voltages.

no backlights have come on at all that i can tell even with the two boards connected.

[ixiboneheadixi]

Re: lg 46LD550

"i disconnnected the cable from the two boards and the red LED light would not come on after i plugged it in to the wall again." that is normal because we remove the power feeding the main board you removed the cable. So the backlights did not come on then?
Next we will need to test the voltages.

yeah the only thing that has come on at all either way is the red LED light nothing else. no sound or picture or anything. and all the caps are fine

[budm]

Re: lg 46LD550

http://www.shopjimmy.com/media/catal...9506-top_2.jpg

On that white connector p201, you need to check the DC Voltage on the 'POWER' pin, use the metal chassis as the ground ref point for the meter, you should see the voltage on the 'POWER' pin toggle betweedn < 1V and > 2VDC when the power switch is toggle on and off.

[ixiboneheadixi]

Re: lg 46LD550

http://www.shopjimmy.com/media/catal...9506-top_2.jpg

On that white connector p201, you need to check the DC Voltage on the 'POWER' pin, use the metal chassis as the ground ref point for the meter, you should see the voltage on the 'POWER' pin toggle betweedn < 1V and > 2VDC when the power switch is toggle on and off.

ok, could you recommend me a cheap meter to measure voltage with then? ive not had to deal with this before so i will have to order something from amazon or go to walmart or something.

[budm]

Re: lg 46LD550

I have no idea what is available at Wallmart or Sears since I have never buy meter from those place before. Me someone can chime in. I would say $50~75 meter should be good enough for now.

[ixiboneheadixi]

Re: lg 46LD550

I have no idea what is available at Wallmart or Sears since I have never buy meter from those place before. Me someone can chime in. I would say $50~75 meter should be good enough for now.

http://m.homedepot.com/p/Klein-Tools...149/204367271/ should something like this do the job

[ixiboneheadixi]

Re: lg 46LD550

http://www.shopjimmy.com/media/catal...9506-top_2.jpg

On that white connector p201, you need to check the DC Voltage on the 'POWER' pin, use the metal chassis as the ground ref point for the meter, you should see the voltage on the 'POWER' pin toggle betweedn < 1V and > 2VDC when the power switch is toggle on and off.

ok i just bought a multimeter, exactly how would i go about doing this. ive never used one before and i dont know what setting to put it on or where to but the red or black wires. http://www.walmart.com/ip/Digital-Mu...10709/14521541 is what i have

[vinceroger69]

Re: lg 46LD550

have you used a multi meter before? maybe post a picture of your meter up so we can advise you what settings to have it on.

[ixiboneheadixi]

Re: lg 46LD550

have you used a multi meter before? maybe post a picture of your meter up so we can advise you what settings to have it on.

no i have not, and i just edited my last post of what one i have.

[ixiboneheadixi]

Re: lg 46LD550

anyone?

[tibimakai]

Re: lg 46LD550

https://www.badcaps.net/forum/showth...hlight=46ld550

[Shinju]

Re: lg 46LD550

I actually do have a question, does your mainboard have a LED status light what color does it illuminate when you turn it on or apply power? your LG lay out is very similar to the 42LH50-UC unit I am currently trying to figure out!

[ixiboneheadixi]

Re: lg 46LD550

I actually do have a question, does your mainboard have a LED status light what color does it illuminate when you turn it on or apply power? your LG lay out is very similar to the 42LH50-UC unit I am currently trying to figure out!

not that i could see, i just have the normal LED light at the bottom of the TV itself. i will check again to be sure though. i just have no idea how to fix this damn thing lol

[blucube]

Re: lg 46LD550

Guessing since it's been a few months, there was no resolution to this. However I am having more or less the same problem, will probably start another thread...