Re: Vizio LED Driver



Where is the BGA located on the mainboard? I've already tried replacing the eeprom but no luck....

Re: Vizio LED Driver



There is one labelled On/Off and DIM, but neither are connected to anything. Might be because this TV supports dynamic back light, which is probably controlled by the motherboard. Here is a picture from Shopjimmy of the board.


[url]https://assets.shopjimmy.com/media/catalog/product/cache/1/image/f8f28dc4a19c21aeb55ee5774693fb5d/s/h/shopjimmy-adtve2425xb6-top.jpg[/url]Re: Vizio LED Driver<br /> <br /> ...is TV supports...

Re: Vizio LED Driver




cn801,2,3,4 is:
cn801
cn802
cn803
cn804
They all have 0v on all pins, so no power is going to the LED's.


ZD801: 24.3v and 4.3v
D865: 4.03v and 0.05v
C8027: Not shorted...

Re: Vizio LED Driver



I don't see anything labelled BL-ON. But I get 2.9V for PS-ON.






PS-ON = 2.9v
BL-ON = Don't see anything labelled BL-On

[B]cn805[/B]
Black - 0
Brown - 0
Red - 3.1v
Orange - 0
Yellow - 0
Green - 0
Blue - 0
Purple - 4.9v
Grey - 0.05v (pin 9)
White - 12.14v


[B]cn801,2,3,4 = 0v[/B]


It looks like the issue may be with CN805 pin 9 since I'm only getting 0.05v....

Re: Vizio LED Driver

Thought I'd also mention that if the TV is left plugged in, the power indicator comes on then begins to flash then turns off. It keeps doing this until I plug it in. Sometimes I have even heard audio coming from the TV, but not always.

My Vizio P502UI-B1 TV has no backlight and from what I can tell no image. The TV power indicator turns on for a few minutes then begins flashing for about 30 seconds then turns off. I've tested Power board and that looks good. Even changes the eeprom, but that didnt help. One thing I noticed is that the LED driver board has no power going to the LED plugs. In my image, I can see there is power on the green connection/capacitors but I get no power on the red connections/capacitors. Is it safe to say that the led driver board is bad? Anything else I can check before ordering a new board?
...

Re: New Members - please post your introductions here

Hi all, found this site while trying to troubleshoot my Vizio tv. Looks like this forum has a lot of knowledgeable people and a lot of helpful topics. Looking forward to diving in.