Vizio vw42l hdtv10a flicker problem

[topfli8979]

Picked up a vizio vw42l hdtv10a, works good till it gets warm. then the backlight flickers really fast. Probably a main board issue?

[XmouseX]

Re: Vizio vw42l hdtv10a flicker problem

I have had a bad capacitor on the backlight/inverter board.

[awyatt2]

Re: Vizio vw42l hdtv10a flicker problem

two caps on each inverter board. four total. there is a mod posted somewhere on this forum for the inverter boards which i think are phillips.

[topfli8979]

Re: Vizio vw42l hdtv10a flicker problem

one on each board is slightly bulged, I will replace and see what happens.

[awyatt2]

Re: Vizio vw42l hdtv10a flicker problem

best if you replace all 4, chances are they all 4 are bad.

[budm]

Re: Vizio vw42l hdtv10a flicker problem

Inverter mod if it uses these inverter boards.

[topfli8979]

Re: Vizio vw42l hdtv10a flicker problem

My invertor boards are 702 and 703, but they look very similar. Thanks for the info guys.

[topfli8979]

Re: Vizio vw42l hdtv10a flicker problem

All you guys here are amazing, I really appreciate all your help.

I replaced the 4 caps, unit is working prefectly now.

Thank you all.

[capkid]

Re: Vizio vw42l hdtv10a flicker problem

Inverter mod if it uses these inverter boards.

Did you order the actual kit, or did you purchase the components individually? Where did you purchase the components? I have Rev 1.2 6632L-0470A and 6632L-0471A inverters. I was going to order the components from Digikey, but I want to make sure I get parts with the correct specs.

Thanks.

[capkid]

Re: Vizio vw42l hdtv10a flicker problem

It looks like these SMD caps and resistors will work based on physical size measurements I took. I went for a 250V cap and a 0.4W resistor:

http://www.digikey.com/scripts/DKSea...28849335903022

http://www.digikey.com/scripts/DKSea...28849335903022

I'm still unsure of the appropriate 33V TVS zener diode. Digikey lists quite a few unidirectional and bidirectional diodes with that voltage: Does step 3.5 of the mod instructions indicate that either diode type will work?

[capkid]

Re: Vizio vw42l hdtv10a flicker problem

I applied the version II mod as part of the fix; it failed after about a week, and I have no sound or picture. At first glance, it appears that a component on the master inverter died.

[whome5972]

Re: Vizio vw42l hdtv10a flicker problem

I have replaced 4 caps on the inverter boards.At first no change .picture is now is on but inverters buzzing and some flicker on one side(left).The inverter on that side(slave)seems to be buzzing louder.Any ideas why?It had a very fast constant flicker over entire picture before.