LG 60PZ950S - No Sound , No Picture

[Piotr07]

Story of the repair: TV had some cold solders of coils on the Z-SUS , the board has been resoldered but after mounting the board I forgot to tighten all scews . When I power on the TV, I found some overcurrent on the Z-SUS , of course it was because of my mistake. Z-SUS board has been checked and any faults, the Y-SUS ans PSU also works correctly.
The problem is on the Main , because TV wakes up from the STBY but no voltages M5/Va/Vs or Z/Y-SUS boards. The display works correctly on the AutoTest(autonomous mode) - of course, the Main is unplugged on this test. So, the PSU+YSUS/ZSUS should be OK when the display works on the AutoTest.
I suppose that the Main has some protect mode(after overcurrent error), then does not start all voltages(M5/Va/Vs) .
Do you know how to get into Service/No protect/ mode on this plasma TV chassis PD12C / PD12A . I think should be some service mode that the overcurrent faults can be removed.
Or have you some dumps of the SPI/EPROM for this Mainboard EAX63525103 for 60PZ950S or 50PZ950 ?
Greetings from Poland

[freakaftr8]

Re: LG 60PZ950S - No Sound , No Picture

I wouldn't suspect main board at fault at 1st I would try disconnecting ysus or zsus power connector and see if power supply rails come up.

[Piotr07]

Re: LG 60PZ950S - No Sound , No Picture

I wouldn't suspect main board at fault at 1st I would try disconnecting ysus or zsus power connector and see if power supply rails come up.

Please look again at my description, I was writing that the display works OK on SelfTest Mode so the SUS boards should be OK .

[freakaftr8]

Re: LG 60PZ950S - No Sound , No Picture

Right. Want at i meant is you mentioned overcurrent on x sus. Something senses this as a fault. If mainboard will not power the ps_on then maybe you should look at an overcurrent issue in zsus by disconnecting it out of circuit then see if mainboard trips overcurrent.

But I believe overcurrent is handles solely on power supply. So I suppose it could be a main fault as well. What are your ps_on and error det pins doing to mainboard?

[Nick's Tvs]

Re: LG 60PZ950S - No Sound , No Picture

If you have the test pattern show up properly then indeed it is a bad main. It would be cracked solder joints on the BGA chip. You would need to get the Main board reworked/reballed.

https://www.nickstvs.com/store/p1363/EBT61582702