Vizio VX32L turns on with backlight, no video or sound

[woodyfl]

Re: Vizio VX32L turns on with backlight, no video or sound

d usually stands for diodes try retesting these on diode test they should read in one direction only

Oh ok D for diodes that explains the arrows. D stands for dummy me too.

Luckily upon further inspection it seems the old U10 has seen better days so I guess its the culprit hope this is the only problem.

Man does that iphone take great closeups.

[vinceroger69]

Re: Vizio VX32L turns on with backlight, no video or sound

d usually stands for diodes try retesting these on diode test they should read in one direction only

[woodyfl]

Re: Vizio VX32L turns on with backlight, no video or sound

Hello I have a similar problem with a Vizio VX32L i picked up cheap since I have a VW32L and VX37L working fine.

Vizio light would glow but nothing else. When I swapped out the main board from the VW32L the TV worked So the problem is narrowed down to this board.

Its removed from the TV so I located the fuses with the help of this forum.

D32- ok
D30 - BAD
D45 - ok
D53 - BAD
D9 - ok
D54 - BAD

Does this seem likely that 3 fuses all went bad? I dont know how to identify these to find replacements. Any help would be greatly appreciated.

I read as much as I could here so i hope i've not repeated a common issue.

I havent tried to tackle something like this since 10th Grade electronics class back in the late '70's but im getting bored with my regular job and getting cheaper as I age.

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

So is it possible white screen could be from bad caps on main board? There's a lot of them

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

Better pics but not great - All the caps that are bent are they simply bent and not the plugs coming out at the bottom? Also check none are snapped off In the bottom right hand corner of pic 1 there is an ic with 16 legs it has a brown mark on it. Is that just the pic, just some lacqer stain or a burn? The bigger cap leaning over it also has brown on the end is that just the pic or has it leaked.
Its also not good news to see that they are mainly Taicon

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

Im trying this is my camera phone it seems if I go back far enough to get the whole board in there is too little detail so here are 2. I think I can increase resolution if necessary.

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

I keep coming back to this - there are loads of caps on that board I have a small faulty tv with a similar number, perhaps more, and I just cant get my mind round replacing them all.
Can you try for better picture of it to see if we can spot anything and also
one of the power supply. I think cashkennedy had a problem on this set
with a faulty trace so the regulators sometimes measured ok and sometimes they didnt. I believe it is a holiday weeekend in the us so I guess there are less members online.

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

I'm also seeing one cap on the main board that appears to have a 'slight' bulge, hard to tell but looks a little bulged compared to the others...

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

So assuming 5v is OK, still can either be main board OR LCD controller board is bad? I found this from a book:
Bad Main board- Yes a faulty Main board itself can’t send signals
to the Controller IC. A defective voltage regulator, Scalar IC,
MPU, EEprom and shorted surrounding SMD components could
cause white display problem. Make sure there is signals flowing to
the Controller board before you confirm is the Main board
problem. You can test it by using Oscilloscope on the points at the
connector either in the Main board or the Controller board side.

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

OK Sorry - I was reading the number upside down on the board and
the part that was the same registered the rest didnt. I have searched on the other board numbers and came up with this, which suggests 5v is ok
A Later Version VT is 12v. but perhaps budm will confirm.

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

Thats from the label on the back of the LCD screen

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

I am not sure but I think he means the label on the actual screen panel
I think you think he means the label of the tcon? Some panels use 5v and some use 12v

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

The part # on the label is 59.31T03.061/01
Hope that helps

[budm]

Re: Vizio VX32L turns on with backlight, no video or sound

I am not sure if your panel is 5V or 12V panel, most 32" I worked on use 12Vdc for powering the T-CON. Can you see the label on the panel so I can look up the spec?

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

5vdc

[budm]

Re: Vizio VX32L turns on with backlight, no video or sound

What DC voltage do you get at the T-CON fuse?

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

All 3 fuses tested good Anything else I can check?

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

Ok Main board pic is not really clear enough for trouble shooting, having said that there are two fuses I can see just above the second connector from the left.
They are white rectangles with gold? ends- board may be marked as F1 & F2 but I cant read it.
On the Tcon there is a white fuse near the right hand end of the connector at the bottom of the pic - it looks to have a red marking on it.

There may be others - now you know what to look for you can look.

To test these POWER OFF for 5 mins Meter set on OHMS 200 one probe on each end - should be the same as touching the probes together. Post results

[kevinm34232]

Re: Vizio VX32L turns on with backlight, no video or sound

Pics of VX32L main and T-Con board...

[selldoor]

Re: Vizio VX32L turns on with backlight, no video or sound

May as well do both while youve got the camera going - its only to help you locate the fuses at the moment. Go carefully if the T con is attached to the panel.