Vizio P50HDTV10A can't find bad board

[Badplasma]

Hello All,
I am hoping someone can help me track down a problem with a vizio p50hdtv10a that won't turn on or off. The tv is always on I can only turn it off by using a powerstrip. I had the bad caps on the psb and the problem with the picture not staying on so I replaced the psb and the ysus boards but it still wont turn on or off. If I unplug the 7pin connector on the left side of the psb(see photos) the tv will power up, relays click on and i have a backlight, three led lights on one of the boards to the left and below the psb come on. If that connector is plugged in I get nothing but the green light on the front of the tv.

[Alastair E]

Re: Vizio P50HDTV10A can't find bad board

Hmm-

No Backlight, Its a Plasma-They dont have 'em, an LG X3 probably from what I see in the pics, or poss a V8.

--Try the Ext-Auto-Gen on the control-board, confirm test-patterns, but Mainboard is prob dead or has missing supplies...

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

I may be using the wrong terminology. when the set is on and without the seven pin connector plugged in the screen will have faint light all over.
It is definitely a plasma of that I am sure. What I don't know is which of the three boards is bad. I am guessing one of the has a short somewhere, but I don't know how to track it down.
Thanks for your help with this

[Alastair E]

Re: Vizio P50HDTV10A can't find bad board

Test-Patterns...?

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

Here are some more pics.

I hope this helps

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

OK I hope this is what you are asking for, I am not an expert at this but I have a multi-meter and I am not afraid to use it. Testing the four pins for dc voltage from left to right I have 0.0, 3.3, 3.3, 0.0

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

There is no image on the screen if that is the "test patterns" you are asking for I have no way getting them. I can test for ohms , ac and dc voltages and for shorts. when the seven pin connector is plugged in I have no dc-v on the Vs or Va and nothing on psb or ysus fuses. the fuses all test good but no power to them. I don't mind replacing boards, but I would rather replace just the bad one and not the rest of them.This is a pic of the seven pin connector that seems to short out everything.

Thank you all for any assistance you can give me.

[Alastair E]

Re: Vizio P50HDTV10A can't find bad board

On Ext-Auto-Gen, you short out pins 1-2 or 3-4 and you'll get test-patterns. You need to disconnect the LVDS cable first, then power it up.

LVDS is cable from cont. board (One with Auto-Gen on) to mainboard.

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

ok the set is on (still no image on screen) the lvds cable is unplugged and the ext_auto_gen pins 1 and 2 are shorted. what am I looking for?

[Alastair E]

Re: Vizio P50HDTV10A can't find bad board

Well--there should be images on-screen, usually cycling through...

If not, you have display issues, prob one of SUS boards or the PSU. Check voltages, Vs Va, VSC -Vy and VZ-Bias

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

Vs is 191.2dcv at psb ysus and zsus boards. Va is 60.2dcv on all three. sorry for not understanding the others.

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

Further testing the connector from psb to main is P800
with it unplugged led's on the ctlr board d2-0ff d3,d4 and d5 on. when i test the p800 pins (ac-d 4.8 then 0.0 testing shuts down ps)(rl-on 0.0 testing shuts down ps)(5Vsb 4.9-5v)(DET 4.6v)(VS-ON 1.1v)(5V-D 5v)(GND 0.0). I have seen two threads with similar problems but they end without a solution being posted.

Thank you all for your help

[Badplasma]

Re: Vizio P50HDTV10A can't find bad board

I replaced the main board the ctrl board the ysus board and the power supply board. Good news is the TV works and has really good picture (for a 720p). Bad news is now the remote control doesn't work which is weird because it worked perfect before I fixed everything else. anyone know how to test a IR board, or do I need to reset the remote somehow after replacing most of the TV's insides? Any help would be greatly appreciated.