How to fix vizio XVT323SV XVT373SV XVT423SV XVT473SV XVT553SV

[Nick's Tvs]

Hello again everyone,

Earlier this week, I posted on the M470NV and M550NV Vizio TVs and how to fix the most common issues. Well it turns out that all the models of tvs below use almost exactly the same Main board and all experience the exact same failures. If you have one of the TVs below, please follow this link to the original thread for details on how to fix your TV dependent on the symptoms:

https://www.badcaps.net/forum/showth...ghlight=M550nv

1. Symptoms of a bad main board:
2. TV turns on, but the on screen vizio logo freezes and the tv eventually cycles off and back on again. (this can sometimes happen endlessly or until power plug is removed)
3. TV turns on, both sound and picture come through, however the TV menu is very slow to navigate and seems to freeze a lot.
4. TV turns on, the menus and component/coaxial input work, however the HDMI ports don't appear as optional inputs
5. TV turns on, menus work smart apps work, but the HDMI ports have no sound and no picture. (No signal keeps appearing)
6. TV turns on and HDMI ports work, but no sound
7. TV does not turn on, and the small vizio logo at the bottom of the frame keeps flashing white to orange endlessly
8. Tv does not seem to turn on, the vizio logo on frame does not flash but stays orange.
9. Tv logo goes from orange to white but the TV does not turn on.

M470NV Main board model 3647-0302-0150
M550NV Main board model 3655-0102-0150 Both use board number 0171-2272-3235


XVT323SV Main board model 3632-1182-0150
XVT373SV Main board model 3637-0592-0150
XVT423SV Main board model 3642-0962-0150 All use board number 0171-2272-3237
XVT473SV Main board model 3647-0312-0150
XVT553SV Main board model 3655-0122-0150


XVT3D424SV Main board model 3642-1132-0150
XVT3D474SV Main board model 3647-0342-0150 All use board number 0171-2272-3454
XVT3D554SV Main board model 3655-0222-0150