Vizio vt471xvt

[techtip]

Hi Guys, This tv started with no picture sound ok, i found the problem to be in power supply/inverter, replaced module with a used one. picture looked normal after that, put the cover back on, tried the tv again and this is what i get! (see picture) any idea what can cause this??

[newtothis]

Re: Vizio vt471xvt

Check connections to T-CON

[techtip]

Re: Vizio vt471xvt

reseated ribbon cables,cleaned all connectors with contact cleaner,still same problem.
are there any test points that can be checked?

[newtothis]

Re: Vizio vt471xvt

Since it was fine until you replaced the back cover I'm wondering if you dislodged the ribbons that enter the driver boards across the LCD panel.. Did you check those?

[techtip]

Re: Vizio vt471xvt

I can see them by looking at the end of the ribbon cables and they seem to be in contact with the sockets? Can the power supply cause something like this,the voltages are dead on also checked for ripple and its ok.

[newtothis]

Re: Vizio vt471xvt

Possibly.
if voltages are OK i wouldn't look that way though.


Re seat those cables just in case, seems mighty odd that when you put the back on it started doing it, those cables could of easily been dislodged slightly

[techtip]

Re: Vizio vt471xvt

Ok i'll try that tomorrow. Thanks

[techtip]

Re: Vizio vt471xvt

Ok,Placed wrong screws in wrong holes! That chewed up some of the prints on the panel board. Repaired all prints, Should have been a surgeon! Bu now i believe i have a problem with tcon board. there is a 3a fuse not blown, 11.75v on it there is a regulator not sure probably 3.3v the main ic is running a bit warm,any more input will be greatly appreciated.

[newtothis]

Re: Vizio vt471xvt

Before you put the back on was the picture fine?

[techtip]

Re: Vizio vt471xvt

Yes, I am thinking that maybe the screws shorted something out when i switched the tv on.

[newtothis]

Re: Vizio vt471xvt

Ok what board did the screw hit.. T-con?

Take a pic please

[techtip]

Re: Vizio vt471xvt

It is the screen driver baords

[techtip]

Re: Vizio vt471xvt

can't upload picture for some reason,will try again later.

[newtothis]

Re: Vizio vt471xvt

You mean the boards with the tab bonds that go to the panel?!!!!

[techtip]

Re: Vizio vt471xvt

Yes.

[newtothis]

Re: Vizio vt471xvt

Really need to see a picture of the damage, but its my thought that the damage is beyond any repair

See what Tom thinks too

[tom66]

Re: Vizio vt471xvt

Yeah, if you damaged the panel board and you can't fix it... game over sorry.

[techtip]

Re: Vizio vt471xvt

Yes the panel board was damaged,had to jumper a total of 8 traces, did a continuity on all traces and test ok. No components were damaged.

[tom66]

Re: Vizio vt471xvt

OK, so does the fault look different? The same?

[techtip]

Re: Vizio vt471xvt

The fault now looks totally different.If i can get thttps://www.badcaps.net/forum/images/attach/jpg.gifhese pictures to upload!??/