Hi, I've been stalking the site trying to diagnose the problem with my Vizio M60-C3. When turned on, the screen remains black and there is no audio. There is nothing displayed on the screen using the flashlight test, but the status light does illuminate and the optical audio out port does illuminate. The symptoms are almost identical to https://www.badcaps.net/forum/showthread.php?t=51443.
On the power supply board (60CAP090), with the TV off, everything reads ~0V except for the two +12V rails (pins 8 & 9 on the connector the main board (CN201)), which read 12.57V, and the AC-DET (pin 12), which reads 3.79V.
When I press the on switch, the status light illuminates and then starts to flash, indicating some kind of problem.
On the connector to the LED driver board (CN301) top right connector on the power supply board), the X00020 pins (pins 3-8) read 26.48V, and the pin labeled VSNS changes from 0V to 2.45V. Pin 12 stays at 0V. So the power supply is providing 24V power to the drivers.
On the connector to the main board (CN201), the T CON ON (pin 15) and 12V T CON (pin 14) both remain at 0. Likewise, the power supply provides 0V to the T CON board through pins 1-4 on the connector at the top left (CN202). The 12V rails (pins 8 & 9) remain ~12.55V. The 12V-AU (pin 4) gets activated to 12.55V, although no audio is produced. The PS-ON (pin 3) signal is provided from the main board at 5.12V, and the AC-DET (pin 2) stays at 3.77V.
On the LED driver board, the power feeds in at 26V through CN102. All of the pins for the CN101, which I believe from reading through the other posts is the BL-ON signal, read 0V.
There aren't any obviously blown connections, FETs, or capacitors on any of the boards.
I'm guessing this is a main board problem because there isn't a signal telling the T CON and BL to activate. Am I correct? Is there something else I should check before I try to hunt down a new main?
Thanks so much!
On the power supply board (60CAP090), with the TV off, everything reads ~0V except for the two +12V rails (pins 8 & 9 on the connector the main board (CN201)), which read 12.57V, and the AC-DET (pin 12), which reads 3.79V.
When I press the on switch, the status light illuminates and then starts to flash, indicating some kind of problem.
On the connector to the LED driver board (CN301) top right connector on the power supply board), the X00020 pins (pins 3-8) read 26.48V, and the pin labeled VSNS changes from 0V to 2.45V. Pin 12 stays at 0V. So the power supply is providing 24V power to the drivers.
On the connector to the main board (CN201), the T CON ON (pin 15) and 12V T CON (pin 14) both remain at 0. Likewise, the power supply provides 0V to the T CON board through pins 1-4 on the connector at the top left (CN202). The 12V rails (pins 8 & 9) remain ~12.55V. The 12V-AU (pin 4) gets activated to 12.55V, although no audio is produced. The PS-ON (pin 3) signal is provided from the main board at 5.12V, and the AC-DET (pin 2) stays at 3.77V.
On the LED driver board, the power feeds in at 26V through CN102. All of the pins for the CN101, which I believe from reading through the other posts is the BL-ON signal, read 0V.
There aren't any obviously blown connections, FETs, or capacitors on any of the boards.
I'm guessing this is a main board problem because there isn't a signal telling the T CON and BL to activate. Am I correct? Is there something else I should check before I try to hunt down a new main?
Thanks so much!
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