Vizio XVT3D474SV Completely Dead

[dadunn1960]

About 3 weeks back my Vizio started acting up and would have to be reset and this solved all problems. A few days ago hit the remote and nothing happened, went through the reset procedures and nothing happened to include the orange Vizio logo doesn't even light up. I contacted Vizio and they referred me to a company for repair, but they are not in my area and there is actually nobody locally I can find for repair.

So I began my troubleshooting and reading and have found several articles about bad capacitors and resistors with Vizio. I did check that 120 volts is going into the power board, but from there really have no idea. All the boards look ok and really don't see anything suspicious. Really at a lost and would appreciate anyone with any advice on what and how to troubleshoot.

My thought is the main power board (part # 050005050860) has gone south.

Thanks,
David D

[budm]

Re: Vizio XVT3D474SV Completely Dead

Please start with this:
https://www.badcaps.net/forum/showthread.php?t=39740

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Hope the Pics help!

[budm]

Re: Vizio XVT3D474SV Completely Dead

The connectors on the power supply board have labels for each pin to tell us what they are for, so please take the DCV reading when the TV is plugged in but the power switch is NOT activated, then take the readings again after the power switch is activated so we can see what are missing. Make sure to put the pin names for each pin next to the Voltage readings, they are must have info.
We also need the pictures of the whole back side of the TV so we can see how all the boards are connected together.

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

I did record all the pins positions for 5 connections, however when push the off/on switch nothing happens and there is no change.

CN201 Pin 6 and 7 +12V:nothing Pin 8 and 9 +5.1VSB: 5.1 and no change with on/off

CN202 Pin 1,2,3,4+5.1VSB and only reading 5.1 on pins 1 and 2 and nothing on 3,4. PIN 5-9 are GND: nothing on all except 8, 9 which both have 5.1
Pin 10, 11, 12 +12V:Nothing

Note that CN202 is a double row of pins and the diagram just list 1-16 straight across, not sure if my evaluation is correct?

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Any suggestions? I did swap out the power control board with no changes

Thanks!

[ecking767]

Re: Vizio XVT3D474SV Completely Dead

You have no orange light on the TV power indicator, maybe the main board bad.

check the main board processor heat sink shield with the TV power plug in. Touch with your hand to see if it is getting too hot or remaining cold.

also disconnect the two ribbons cable and the power cable going to the pc board. this is a 240hz TV and this board is known to fail, see picture

something is keeping the processor from powering on.

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

The Vizio logo does turn orange when plugged into AC power. Did check the processor and no change at all. What do I need to check when disconnecting the two ribbon cables.

Also nothing happens when I press the on/off switch.

Thanks for the Help!

[ecking767]

Re: Vizio XVT3D474SV Completely Dead

About 3 weeks back my Vizio started acting up and would have to be reset and this solved all problems. A few days ago hit the remote and nothing happened, went through the reset procedures and nothing happened to include the orange Vizio logo doesn't even light up. I contacted Vizio and they referred me to a company for repair, but they are not in my area and there is actually nobody locally I can find for repair.

you said the Vizio logo doesn't even light up a little, confuse. I think the main board is bad, mainly the flash memory chips the store the firmware is corrupt. replace your main board

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

The Vizio logo does light up orange when I plug into AC power. The main board is the one in the center? Any recommendations as to where I can find the board?

Thanks

[budm]

Re: Vizio XVT3D474SV Completely Dead

http://www.shopjimmy.com/catalogsear...zio+XVT3D474SV

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Shopjimmy is closed for renovation. I did find some boards online but some of the parts numbers were not exactly the same?
I do have a question, I went back and checked for power on the power board (CN202) and pins 1-4 have 5.1 VDC and 10, 11, 12 have nothing. CN201 pins 6 and 7 have nothing and pins 8, 9 have 5.1
Wandering why I have the 5.1 VDC but no 12 VDC on either 201 or 202?

[budm]

Re: Vizio XVT3D474SV Completely Dead

Because the Main board has to send the PS-ON (pin 13 REMOTE ON/OFF) signal to turn on the rest of the power supplies, do you have >2VDC in that pin when power switch is activated?
Good pictures provided by Shopjimmy.
Pin 14 is for BL ON/OFF, it should be >2VDC when power switch is activated.

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Pin 13 has nothing and pin 14 has .006 VDC. No changes when I press the off/on switch.
Would the next step be to replace the main board or more troubleshooting? Is the main board the same one that ecking767 recommended in post 10?

[budm]

Re: Vizio XVT3D474SV Completely Dead

You will have to match the numbers on the barcode sticker, go to Shopjimmy site to get more info.

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Do you recommend replacing the main board3 647-0342-0150 (4B)? I did go there but they did not have the (4B) after the part number, is this something I need to ask for?

Thanks

[budm]

Re: Vizio XVT3D474SV Completely Dead

I would contact Shopjimmy.

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Contacted Shopjimmy, but they do not have the part available, found the part at TV Central Parts.
After I install the new part, is there any software that has to be loaded or any special procedures required?

Thanks

[dadunn1960]

Re: Vizio XVT3D474SV Completely Dead

Thanks to ALL those that helped me with the troubleshooting and providing technical guidance, part came in today and that fixed the Vizio. Only issue is the remote control isn't working, not sure why. If anyone has any ideas I will certainly be willing to try.

Thanks again!!