Vizio P50hdtv10a vertical bar

[topfli8979]

Got ANOTHER p50hdtv10a with flickering screen, replaced shorted ipms on the y board. Now I have a vertical bar in center of the screen when powered on, goes from top to bottom. I push input the vertical bar goes away, and a green distorted 8-inch box pops up in the left corner, but it is not readable. here is a picture, lower buffer is disconnected as of now, reason for only half screen.

[tom66]

Re: Vizio P50hdtv10a vertical bar

Try with both buffers installed. You probably have bad FETs on the buffers.
http://blog.coppelltvrepair.com/2010...-lines-in.html

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

I initially had both buffers hooked up, same vertical bar top to bottom. I will check the fet's.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

all 3 fets on the upper buffer did not ohm out, was showing about 12 ohm each, replaced. But still have short to ground. All my ic's look good.no pin holes.

[tom66]

Re: Vizio P50hdtv10a vertical bar

I would try applying a low current across supply and ground, around 500mA or so, max 5V, and see what heats up.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

Found 2 shorted fets after further testing, replaced them, short is gone from the buffer board. BUT, now when installed in tv, I get no picture, no screen "prime" glow at all. The y sustain is humming like it should. I dont wanna buy another y board.

[tom66]

Re: Vizio P50hdtv10a vertical bar

Check you secured all connection cables, including the one between the Y buffers present on some of these sets.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

All cables are secure, I did find some voltage quite odd. At the 5v test point on the upper buffer board connected to ysus, I am getting -112 volts? How is this happening?

[tom66]

Re: Vizio P50hdtv10a vertical bar

5V on there is relative to Vsc or -Vy voltage. it's floating 5V.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

That makes sense. I got no luck with getting any "glow" to the screen. Im thinking panel may be shot. But wouldnt the tv go into protection if something was faulty?

[tom66]

Re: Vizio P50hdtv10a vertical bar

The panel will usually buzz loudly if it is bad. I highly doubt the panel is bad. Aside from cracked screens, these panels are reliable.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

Im only getting 11 ohms on the upper buffer board, shouldnt i be getting between 300-600 ohms for it to be functioning properly?

[tom66]

Re: Vizio P50hdtv10a vertical bar

You should get infinity / OL one way and around 600mV drop the other way (diode mode, not ohms. You can't use ohms mode to get accurate reading on these boards.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

I think I got my buffers sorted,now for the y sustain. On the VSC test points one is measuring -101 v and other is +11v, these should be higher?

[steinerk]

Re: Vizio P50hdtv10a vertical bar

Good stuff guys, I have one of these tv's of my own that I am repairing. P50HDTV10A
I found that three of my six total FETS on the buffer boards were shot so I replaced all of those at the same time and I am also about to begin trouble shooting my Ysus. Is it possible when the Buffer FETs went they took an IPM with them? (I have to wait for a cable to come in the mail before I can work on the set anyway since my cat chewed through it.......*facepalm*)

[steinerk]

Re: Vizio P50hdtv10a vertical bar

Sorry for the double post, but does anyone know where to get ahold of the IPM's for this set?

[johnboy1313]

Re: Vizio P50hdtv10a vertical bar

Ebay

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

What is the NC pin above the vs+ on the power supply board? What should it be reading on the meter?

[tom66]

Re: Vizio P50hdtv10a vertical bar

No connection. Don't need to check it.

[topfli8979]

Re: Vizio P50hdtv10a vertical bar

LOL of course!