Chosen Solution
Hey guys I’ve seen many similar situations but not quite the same as what I have here. I have an LG plasma, 60pv400, that turns on and works fine for about 10 minutes, but then the screen goes black and I only get sound. It works like nothings wrong for those first minutes. I can pull up the menu and everything. Turning it off and then turning it back on even fixes it, albeit for a decreasing amount of time. The weird thing is, the temporary fix I found is to go to menu and place the energy saving mode to maximum, which makes the screen very dark! This is fine at night, but during the day it’s not enough brightness to watch very well. Interestingly enough it never shuts off this way. So as far as solutions go, I’ve looked into several troubleshooting things to try and ultimately have changed out the power board and the y buffer boards, but to no avail. So I’ve decided to post on here in hopes someone who’s more knowledgeable can help me out. Now, where to start? Can anyone point me in the right direction? I’ve got my multimeter on standby. Update (06/03/2019) Hey! Thank you for getting back to me so quickly! I’m sorry it took so long to respond!
(tv with open back)
So the sticker that has the voltages reads: 5V/Va:55/Vs:203. When I put one probe to ground and one to the test points on the power board, I get 55v and 201v. I also get these voltages on the connectors of both the y and z sustain.
(power board with test point near top) As for the voltages you noted, on my y sustain, I get 150 volts (at the Vsc test points) and then on the Z sustain I get 110 volts when testing the Vzb test points.
(y sustain with close up on test points)
(z sus with close up on test points) I don’t see where it says what the Vsc/Vzb voltages should be, but I do notice that below the Va Vs readings on the sticker, it also says 180/150/n.a./110, maybe that’s a clue? My guess is that those voltages are ok? Anything to try next?
Spoiler alert: it was the ysus board. Changed it, and now it works like a charm!
@polkalosses that is a tough one. Usually it’s the Y-sustain or Z-sustain. Check to see if there is a label on top of the panel with some voltages. Should be something like Va,Vsc and Ve(Z-bias) check those voltages against the test points on your boards. Ve(Z-bias) should be marked as VZB on the Z-sus board. Vsc and Vy on the Y-sustain. Ve(Z-bias) should be around 70-150 v. this is really a tricky one and it may help to see your boards. Post some good images so we can see what you see. Adding images to an existing question
