Vizio VX32L turns on with backlight, no video or sound

[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

Thats from the label on the back of the LCD screen

[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

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.

[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...

[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

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

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

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

[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.

[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

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.

[woodyfl]

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

I cant seem to find out what is the equivalent of the U10

CAC 1084 0721 NL regulator? I guess

Where can one purchase this? Thanks in advance

[selldoor]

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

@woodyfl perhaps we could make relevant suggestions if you were to update your profile with at least your country and while your in there mains voltage



Have you tested it - doesnt look burnt or anything

[woodyfl]

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

@woodyfl perhaps we could make relevant suggestions if you were to update your profile with at least your country and while your in there mains voltage



Have you tested it - doesnt look burnt or anything

Ok I fixed it. Here we get 110 to 115v at 60hz. no I didnt test it I am not really sure how to do that. I was assuming that it wasnt supposed to look like that. it was my impression most of these components were very low priced if one could find them.

[tom66]

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

What are the voltages on the pins of that device? Check with the black probe in a spare screw hole and the red probe on each pin in succession (except the chopped off one, include the tab/fat pin at the top.)

[retiredcaps]

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

Oh ok D for diodes that explains the arrows.

http://en.wikipedia.org/wiki/Electro...e_designations

[woodyfl]

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

The board is not hooked up to the TV yet again. I just want to be clear where we are going and make sure if we get there i am capable of completing the tasks. i havent used a soldering iron since the 70's. So are exploring the possibility that that component is still good and some how the connecting wire just got fried? If so for me it would be easier to just repair the connection while the component is out of the TV. I am a little nervous about testing voltages on a live board. I will probably need a stiff drink to steady my hand and then thats not such a good idea as well obviously. I am just being frank here I'm not a technician, I learned that years ago. Thanks for your patience. And I appreciate your trying to help me.

[selldoor]

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

"I just want to be clear where we are going and make sure if we get there i am capable of completing the tasks"

OK we can explain things at whatever level is needed.
Obviously we cant do the soldering or testing but can give step by step instructions. Whilst the set will be connected to the mains and on, most of the measurements will be low voltage so as long as you are careful to stay away from the HIgh voltage (Hot) side of the board except when guided to do so, you will be ok. I guess it was just a saying but drink and fixing electronics tend not to go well together.
Is your soldering iron electric and what wattage is it? 40 is often best. If you have time practice - just on any old bits of wire or electrical item. Similarly with your meter - practice on different setting check battery/cells car battery fuses bulbs power adapters - anything. It all helps you to get used to holding the probes and looking at the meter.- When it comes to the board checking there are two good rules.
Measure resistance = Power OFF
Measure voltage = Power ON.

You can get some practice on this board just measure resistance of various components and at the same time learn the board descriptions and what they look like.

Getting to the component in question, it is not fried-it is not meant to have 3 legs connected. The centre leg is meant to be cut off short, so that is why I suspect as it is not burnt it will be ok.

Unfortunately many of the tests to try and find the fault on the board rely on voltages and signals it receives from the other boards so it has to be connected.

It would be great if you tried to fix this as there are a lot of reported problems with this set and at least in your case it seems certain a problem on this board. If we can fix it then it will be something to help others in the future.

[killian6pk]

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

SellDoor is correct there are several versions of that Regulator Package (how it looks) Some have 3 legs and some have only 2 legs soldered with the middle leg cut off. In that case usually the wide metal tab at the top takes the place of the middle leg. I found a datasheet for this Regulator (not sure it is the exact same). It should give you some idea about these and their different packages.

http://pdf1.alldatasheet.com/datashe...X1084-1.5.html

Also on your Fuses they should be small white surface mounted (soldered on each end) and be marked as F1 and/or F2. Often there is written on the board the Amps and the Voltage of the Fuse. You can check them with a Digital MultiMeter set on Ohms with a probe on each end the DMM should read no more than 0.1 ohms. If it reads more than that the Fuse is probably bad. Good news is that they are cheap as are most of the other components on the board. Find the Fuse or Fuses and report back the Amps and Volts you got.