My Vizio model m420nv TV recently had the sound go out. I tried to see if I could get sound out of the audio jack, but it didn't work. I switched from the DirectTV box to the DVD player to see if it was an input problem, but it didn't have sound either. After some research, some people reported the audio setting changes in the menu by itself. I tried to check the menu, but the remote doesn't work (fresh batteries), and the button on the TV itself only accesses the quick menu, which only has volume, power, input, and channel options. I tried researching more, but it seems like everyone has video or power problem, which I do not, and their sound is fine. I was going to see if I could replace the main board, but can't find any in stock. I do see the eeprom available, but am not sure if that is the issue. I've also looked into voltage regulators, but am not sure if any are bad (I will list my results below). Does anyone have an idea of what else I can check? Or where I should go from here?
Thanks,
Brian
Voltage Regulator Results (only ones i could find)
1117 Type
U2
1 - 5.24v
2 - 3.27v
3 - 2.02v
U4
1 - 3.30v
2 - 1.24v
3 - 0.00v
U46
1 - 5.22v
2 - 3.29v
3 - 2.04v
1084 type
U3
1 - 5.21v
2 - 3.30v
3 - 2.05v
7805 Type
U8
1 - 5.03v
2 - 0.00v
3 - 12.01v
Thanks,
Brian
Voltage Regulator Results (only ones i could find)
1117 Type
U2
1 - 5.24v
2 - 3.27v
3 - 2.02v
U4
1 - 3.30v
2 - 1.24v
3 - 0.00v
U46
1 - 5.22v
2 - 3.29v
3 - 2.04v
1084 type
U3
1 - 5.21v
2 - 3.30v
3 - 2.05v
7805 Type
U8
1 - 5.03v
2 - 0.00v
3 - 12.01v
Comment