LG 60pv450 no picture but has sound

[Al79]

I've taken the back off and looked at the caps they all look good. I've also checked fuses they all are good. I've done some voltage checks but this is the first time I've worked on a TV so I'm not totally sure what I'm looking for. So the voltages I'm seeing are VS 203, VA 55, VY 180, VSC 150, VZB 14. Anything sticking out as a red flag? Is VZB suposed to be low (14v)?

[Hamie]

Re: LG 60pv450 no picture but has sound

Are all voltages matching the panel sticker?

[Shinju]

Re: LG 60pv450 no picture but has sound

Check out my troubleshooting thread on this exact plasma display.

https://www.badcaps.net/forum/showthread.php?t=42901

[Shinju]

Re: LG 60pv450 no picture but has sound

I am going to say your vbz at 14v is a huge red flag that your ZSUS board is shot.

[tom66]

Re: LG 60pv450 no picture but has sound

Agreed; A common issue seems to be the ER inductor solder joints failing, which causes the Z-sustain IGBTs to fail after some time.

[Al79]

Re: LG 60pv450 no picture but has sound

Ok. So I've checked the sticker all voltages are good but the VZB (14v). I tried unhooking the ribbon cable and the buffer and still I only get 14v. I pulled the card out and it looks find nothing burnt and the inductor solder joints are fine. I've looked to buy a z-sustain board but no one seems to have one. It's a Lge pop 100920 board 60r3_z partno EAX62076601 rev G if any one has one please let me know.

[Al79]

Re: LG 60pv450 no picture but has sound

Can anyone tell me how to put this tv into a test pattern?

[tom66]

Re: LG 60pv450 no picture but has sound

Really no point if Vzb is so low. But, if you want... Jumper EXT AUTO GEN on control board and disconnect LVDS cable (runs between main & control boards)

That'll engage the test pattern - without the Z-sus it'll be very distorted though...

[Al79]

Re: LG 60pv450 no picture but has sound

Tom66 thanks. The only reason I asked this as I was told that the logic board could be the problem and this could also give a low voltage on the vzb.

[Al79]

Re: LG 60pv450 no picture but has sound

Ok so everyone knows my tv is fixed. It turns out that my z-sustain card was fine but my control board was shot. If anyone is in need of z- sustain I have a spare and it's tested.

[HPJ]

Re: LG 60pv450 no picture but has sound

Sorry to revive an old thread but AL79 any chance you still have the zsus?