Vizio VA26LHDTV10T no backlight

[fuxxy]

Hey guys! Me again!

This time it's a Vizio VA26LHDTV10T

The TV powers on, Vizio logo turns white. Screen doesn't appear to display any output. Press "Menu" and shine a light on the middle of the screen, and the menu comes up.

Have not tested audio output, have not attached any input devices..

So we're getting display on the LCD, but no backlight.

What's my next step?

[martyparish]

Re: Vizio VA26LHDTV10T no backlight

I am new here like you, but I'm sure they(the resident experts) will ask you to upload some closeup pictures of the boards in the TV so that they know what they are working with.

[awyatt2]

Re: Vizio VA26LHDTV10T no backlight

first thing is to check the voltage to the inverters if led should be around 24 volts you need service manual to confirm, most run 24v. the power supply board has a label with voltage stamped near the terminals. if in fact you are getting correct voltage at inverters then you need to post clear pics here of the inverter boards if no voltage the power supply pics. if someone can spot the problem then you get the input if not we at least know what to check. be careful around the heatsinks some can have voltage and some get very hot.

[fuxxy]

Re: Vizio VA26LHDTV10T no backlight

I tested each red wire that was labeled 24V to each black wire labeled GND, I got 24V on every red and a ground on every ground.

I do not see any obvious problems, so I've attached some high res photos of the inverter board.

[selldoor]

Re: Vizio VA26LHDTV10T no backlight

I suggest you remove the pictures and repost them (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

[fuxxy]

Re: Vizio VA26LHDTV10T no backlight

Done.

[awyatt2]

Re: Vizio VA26LHDTV10T no backlight

check f1 0n the inverter board and look for any other fuses there, it is a smd fuse. also read rules on posting about size of pics the higher res photos while good takes a while for dial up to load. i believe the max size is 200x200

[fuxxy]

Re: Vizio VA26LHDTV10T no backlight

I just saw the thread about the same inverter board F1 fuse here: https://www.badcaps.net/forum/showthread.php?t=17214

On my board, the closest component near the markings "F 1A/76V" is the F1 fuse. It appears to be open. Would you guys recommend bridging with a wire for the purpose of testing only? or just locate the correct component and don't touch it till it's correct?

[selldoor]

Re: Vizio VA26LHDTV10T no backlight

No we wouldnt recommend using a wire - however a 1 Amp fuse with a different voltage would be ok for a test. We would normally say same voltage or higher but not sure why it has 76 volts cant be that high on the board?

[tom66]

Re: Vizio VA26LHDTV10T no backlight

Check from both ends to ground for a short.
If no short found then bridge it, but replace the fuse with a proper one before you assemble it.

[tom66]

Re: Vizio VA26LHDTV10T no backlight

76V is just cheapest they could probably get with necessary specs.
Regularly see 125V fuses on inverter boards too.

[selldoor]

Re: Vizio VA26LHDTV10T no backlight

If you have a radioshack nearby you could use one of these for a temp fix
http://www.ebay.com/itm/74-MF1A-B-2-...item257968d816

It is 1A 125v


Sorry meant this one
http://www.radioshack.com/product/in...uctId=12580058

[budm]

Re: Vizio VA26LHDTV10T no backlight

I use PICO II fuse. It looks like this:
http://s807.photobucket.com/albums/y...%20Littlefuse/
Fixed many of this model due to blown inverter fuse.
http://s807.photobucket.com/albums/y...0VA26LHDTV10T/

[fuxxy]

Re: Vizio VA26LHDTV10T no backlight

http://www.ebay.com/itm/2PCS-1A-125V...-/140737094068

Is it slow blow or instant?

[tom66]

Re: Vizio VA26LHDTV10T no backlight

Time delay (T) also called slow blow is the most common.

[fuxxy]

Re: Vizio VA26LHDTV10T no backlight

And it works! I will have the correct replacement fuse on it's way - Thanks guys for your help!