Vizio XVT3D424SV, orange standby light, no other signs of life

[mmac1488]

I have the above mentioned tv, when plugged in the orange Vizio light illuminates but nothing else via remote or power button. I have 5V stqndy on all respective locations on power board, but nothing else. No bl on, no 12v or 18, naturally since nothing is telling it to turn on. I was able to find 3.3v at the power button, and trace it back via a tiny ribbon cable to main board. Soon as it hits main board and comes out the backside of ribbon connector, its gone. It does respond to pressing jog wheel up to that point. I was able to jump the 5v to the bl on pin and at that point had 12v on all respective pins. 18v pins we're a little high around 20.5v. at the led connections at top of power board I was seeing 180v on both connectors. Still no backlights or any signs of life. Any help would be appreciated. Thanks

[mmac1488]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

Power board 0500-0607-0080 main board 0171-2272-0150 (4c)

[mmac1488]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

Sorry I will add photos when im home, phone giving me trouble

[Andrew F. Ali]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

Part of original post by mmac1488
I was able to jump the 5v to the bl on pin and at that point had 12v on all respective pins. 18v pins we're a little high around 20.5v. at the led connections at top of power board I was seeing 180v on both connectors. Still no backlights or any signs of life. Any help would be appreciated. Thanks

Normally with the connector to the Main Bd. disconnected,we would, connect a jumper from standby pin to PS-ON pin and test to see if the 12V, etc came up. Then leaving that 1st jumper in place we would put a 2nd jumper from standby pin to BL-ON pin and see if the backlights come ON. So putting a jumper on from 5V pin to BL-ON pin and getting 12V and 18V doesn't make sense to me.

[budm]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

Yep, made no sense to me either.

[ecking767]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

this model vizio have a boot up process, the power LED suppose to flash amber and white, then stop on amber. Then you can power on your TV.


if you are not getting the flashing of the power LED then your main board CPU need to be reball or replace the main board

[mmac1488]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

What I meant was when I apply 5v to the black remember on/off pin 13 on connector cn202 and at that point I had the above mentioned voltages in their respective locations on the power board. 18v on cn203 (actually reading about 20) and 165v on the v-led labled pin (1) on lcn201

[mmac1488]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

I got the labeling wrong when I said I put 5v to the bl on pin. My mistske.

[mmac1488]

Re: Vizio XVT3D424SV, orange standby light, no other signs of life

And no, no backlights when I put 2nd jumper to bl_on. It ld on/off pin 15. Not sure what that is honestly.