50PC1D Flashing Image Thread/Repair Video

[ReeceyBurger123]

Getting a Lg 50PC1D with a flashing screen and no image at all. The panel tried to sustain but somethings causing it to shutdown. From what I read common issue is a shorted ERC Imp module which blows some mosfets on the buffer boards.

I will be diagnosing it shortly and will be doing a video of the final repair and what I find. In the mean time any suggestions are appreciated.

[aaronwt6]

Re: 50PC1D Flashing Image Thread/Repair Video

I've seen several in this state myself. It's what happens when the IPM partially fails rather than a catastrophic failure that results in a blown fuse on the YSUS as well. End result though is the same -- IPM or total board replacement.

[ReeceyBurger123]

Re: 50PC1D Flashing Image Thread/Repair Video

Right heres what I have found so far, will diagnose further tomorrow Im back at college now so the Tv messing time is limited especially today. So far I have found:

Q101 & Q103 on the lower buffer are both shorted however the Ysus is still not working even with that buffer out, it is building the Setup ramp then collapsing it meaning the Ysus is faulty on going into overload other voltages act the same way.

On the Ysus I found -Vy to be totally dead the transistor mounted on HS3 has low ohms across which is abnormal, this is for -Vy rail as well. The part number is W9NK70Z I will remove it tomorrow and test.

The power IPM's from what I have tested so far are testing perfect.

The Psu also has several badcaps on it, of you have this set replace any Samwha WB and WL caps on the power supply these are known to fail and cause issues. I will be doing this for this power supply.

I will update tomorrow.

[Moreno83]

Re: 50PC1D Flashing Image Thread/Repair Video

Good luck , curious on the video!

[ReeceyBurger123]

Re: 50PC1D Flashing Image Thread/Repair Video

Cheers mate, it wont be too long been a long day lol hopefully get this beast back up and going fairly cheap