LG 60PZ550: Sound, No Picture

[SCCrepairstu]

I have come into a LG 60PZ550 and am trying to fix the problem. I have done the pattern test with no results and am needing further advice. Please advise as I am quite at a stand still.
Thanks.

[sordids999]

Re: LG 60PZ550: Sound, No Picture

Posting Clear pictures of the back of your tv showing the boards with clear pictures may help you more with fixing your problem

[sordids999]

Re: LG 60PZ550: Sound, No Picture

Have you tested VA/VS/VSC voltage test points ?

[SCCrepairstu]

Re: LG 60PZ550: Sound, No Picture

Here is what I have done thus far.

1)Co-worker said plasma had blue/pink spot in certain areas of screen.
2)Confirmed screen issue
3)Research lead me to the multiple threads about the cracked joints on the inductors.
4) Pulled ZSUS and YSUS out and indeed had cracked joints.
5)Resolder all cracked joints. Resoldered all joints that appeared dull, disturbed,cold, etc...
6)Reinstalled boards, but TV would come on for a second then shut off. I could hear the relay switching on and off on the supply board.
7)Tried TV with only ZSUS board connected. TV came on but no picture. Measured voltages off supply board to ZSUS. Nominal.
8)Tried TV with YSUS board. TV would come on then shut off.
9)Measured voltage to YSUS from supply board with YSUS board removed. Nominal.
10)Used both DMM and Scope to see if I could observe a transient voltage off the supply board with the YSUS board connected. None.
11) Suspected YSUS has shorts. Found several IGBJTs with shorted leads.
12)TV was time sensitive to owner, so he opted to buy new YSUS board.
13)Installed new YSUS board and TV now comes on and stays on. Sound is present, but no picture.

[SCCrepairstu]

Re: LG 60PZ550: Sound, No Picture

Disregard previous message. VSC and VY are not nominal as seen below.

Ok so I have measured the voltages and here is what I got

VS 199V
VA 53V
VSC 1KV+
VY 1KV+
VZB 108V

[sordids999]

Re: LG 60PZ550: Sound, No Picture

Disregard previous message. VSC and VY are not nominal as seen below.

Ok so I have measured the voltages and here is what I got

VS 199V
VA 53V
VSC 1KV+
VY 1KV+
VZB 108V

VSC is low are you sure the replacement Ysus you purchased was ok ?

[sordids999]

Re: LG 60PZ550: Sound, No Picture

have you also tested the buffer board for shorts ?

[syaoran123]

Re: LG 60PZ550: Sound, No Picture

Does the control board have a green blinking led when turned on?