Vizio P42HDTV10A Plasma - No sound, picture, or voltages

[drpj23]

I have a Vizio P42HDTV10A plasma set that is having some problems.
Before going on, I know there are similar posts to this on here but none exactly matched my problem.

Upon plugging it in, I can hear the relay click about 3 times.
Then upon hitting the power button you hear the relay click on then off with another click after that. The power light is green and can be cut back off and on again.
Tried a new power supply, but same results. Power supply acts the same with all connections disconnected (except for the main A/V board).
Without the main A/V board nothing happens (no clicks).
So I would guess the A/V board would be causing this? Or possibly another bad P/S?
Also, one of the fuses was blown on the Z-SUS board. That was replaced with no difference in result.
The only other thing is that possibly the secondary P/S is messing with the A/V board? All voltages looked good for that board and voltages to cut on the P/S were about 3v.

[drpj23]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

Here are some pics.

[tom66]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

I've seen this caused by a bad ac detect, but that was on a bad PSU... Still, check the ACD pin on your PSU. It should stay at 5V dead.

[hoadle]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

"Also, one of the fuses was blown on the Z-SUS board. That was replaced with no difference in result." are you replaced new fuse or replaced new Z-SUS board?
I had Vizio P42HDTV10A same problem, find out Z-SUS board is bad, Mainboard tell Power Supply board to turn on ( you can hear click is relay turn on & off) but not pass testing and shut the TV off
Here the replace board
http://www.ebay.com/itm/Vizio-6871QZ...item43af8a232d

Here the parts replace
http://www.ebay.com/itm/Vizio-P42HDT...item27b5cdedb6
Good luck

[drpj23]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

hoadle, I have replaced the fuse within the Z-SUS board.
Luckily I am working on another tv, an LG plasma (42PC3D), and since both tv's are based off of an LG panel I believe both Z-SUS boards can be swopped.
The Z-SUS was bad on the LG (by cutting on for about 10 min and seeing which board was warm or not (for there was no picture but sound)) so I am going to see if it is bad for the Vizio as well.

And tom66, I will definitely check that as well.

Thanks for the replies and I will definitely get back with my findings.

[hoadle]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

hoadle, I have replaced the fuse within the Z-SUS board.
Luckily I am working on another tv, an LG plasma (42PC3D), and since both tv's are based off of an LG panel I believe both Z-SUS boards can be swopped.
The Z-SUS was bad on the LG (by cutting on for about 10 min and seeing which board was warm or not (for there was no picture but sound)) so I am going to see if it is bad for the Vizio as well.

And tom66, I will definitely check that as well.

Thanks for the replies and I will definitely get back with my findings.

Please check the parts # on both board if same you can swopped, if not you will blowed some thing

[drpj23]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

The part numbers are different but shopjimmy offers both to be interchangeable.
Yes, I normally too would not do this, but I felt there was enough reason for it so I tried it.
So the LG PSU relays clicked on and off just like the Vizio, so faulty Z-SUS for both.

I looked at the ACD pin and nothing connects to it nor is there a voltage showing on the meter but when ACD and RLY ON is connected together the relay clicks on.

I guess I'll know more once the Z-SUS boards come in.

[tom66]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

ACD to GND? (Case?)

It should measure 5V if it is good. On mine it was dropping between 5V and 0V randomly.

[drpj23]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

ACD does show a voltage (4.4v)....ya that was bugging me why it tripped w/o a voltage lol. Had a bad ground, sorry

[drpj23]

Re: Vizio P42HDTV10A Plasma - No sound, picture, or voltages

Ok, so although board has not come in yet, I have unhooked everything but the main board (and little sub power supply since that is what give that power) and am still having power issues or relay issues lol. But when I jumper the ACD and RLYON pin together it double clicked and when I let off, it clicked again like I would figure it should.

So main A/V board and Z sus (since it had no luck in the LG plasma)?