I have a Vizio VT420M that has the orange vizio light when turned on and no backlight. Here are the voltages reading on the power supply/main board connector CN9102.
OFF:
o/f-.001
PDIM-.000
12vdc-.072
12vdc-.072
GND-0
GND-0
GND-0
24vdc-.006
24vdc-.006
PS_ON-0
5vdc-5.14
5vdc-5.14
ON
o/f-.095
PDIM-3.641
12vdc-11.43
12vdc-11.43
GND-0
GND-0
GND-0
24vdc-23.30
24vdc-23.30
PS_ON-4.99
5vdc-5.12
5vdc-5.12
I have tried to short the 5v line to the o/f pin with the main board pin disconnected with a 1k resistor and no luck getting the back light to turn on. The o/f pin end of the resistor shows 1.44vdc with it connected to the o/f pin and disconnected shows just under 5vdc. almost like something is drawing it down. Anyone have any suggestions of what to try? I am leading to the main board but am open to ideas. Thanks in advance.
OFF:
o/f-.001
PDIM-.000
12vdc-.072
12vdc-.072
GND-0
GND-0
GND-0
24vdc-.006
24vdc-.006
PS_ON-0
5vdc-5.14
5vdc-5.14
ON
o/f-.095
PDIM-3.641
12vdc-11.43
12vdc-11.43
GND-0
GND-0
GND-0
24vdc-23.30
24vdc-23.30
PS_ON-4.99
5vdc-5.12
5vdc-5.12
I have tried to short the 5v line to the o/f pin with the main board pin disconnected with a 1k resistor and no luck getting the back light to turn on. The o/f pin end of the resistor shows 1.44vdc with it connected to the o/f pin and disconnected shows just under 5vdc. almost like something is drawing it down. Anyone have any suggestions of what to try? I am leading to the main board but am open to ideas. Thanks in advance.
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