LG 50ps3000 power fault

[steved271]

Re: LG 50ps3000 power fault

on another note.... there is a posibility i may be picking one of these up on friday evening to repair, so may me able to help out better then

[dick_barton]

Re: LG 50ps3000 power fault

Have you seen ReeceyBurger123 Youtube video

https://www.youtube.com/watch?v=66SeSEFVc-8

[Alastair E]

Re: LG 50ps3000 power fault

With everything connected and set plugged in--

Check for the Stby-5V supply to Mainboard--Will be marked on the PSU.

IF OK, Locate the PS-On pin of PSU and check voltage while turning set on.

Let us know......

BTW--Its Easily Possible to KILL the CONTROL-BOARD on these sets if--
You unplug the 5V supply to the Cont Board, with Mainboard Still Connected to the Cont Board, and Powering set Up....

--I suspect that this may have happened. (One VERY GOOD reason--NOT to randomly Unplug boards and power set up, if you dont know Exactly What you're doing!!)

Check for shorts on the two Voltage-Regs on bottom edge of Cont Board, and the electrolytic caps near them....

[Mr.deep]

Re: LG 50ps3000 power fault

No problem. I will try get some pictures up this evening. Thanks

[Mr.deep]

Re: LG 50ps3000 power fault

With everything connected and set plugged in--

Check for the Stby-5V supply to Mainboard--Will be marked on the PSU.

IF OK, Locate the PS-On pin of PSU and check voltage while turning set on.

Let us know......


BTW--Its Easily Possible to KILL the CONTROL-BOARD on these sets if--
You unplug the 5V supply to the Cont Board, with Mainboard Still Connected to the Cont Board, and Powering set Up....

--I suspect that this may have happened. (One VERY GOOD reason--NOT to randomly Unplug boards and power set up, if you dont know Exactly What you're doing!!)

Check for shorts on the two Voltage-Regs on bottom edge of Cont Board, and the electrolytic caps near them....

I will try investigate this evening.. I have been trying not to unplug anything with the mains connected.

Thanks for your time and patience. I am a complete novice but at the same time feel it's fixable with guidance.

Thanks

[charis]

Re: LG 50ps3000 power fault

Hi.Its well know problem.
If your set start even after 15 minutes the problem is mainboard bga chip.
Put the power supply out of the set and jump it to measure VA VS.
If you have voltage put it back then put you meter on the pin who sent the power signal to power (from logic)and see when you start the tv if you have 3,2v.
If not take the mainboard out check for cold joint and reflow the bga with hallogen lamp.
If your YSUS and ZSUS dont work you hear a ham and the set are completely dead ,the led on logic board dont light.