Any help much appreciated.
Vizio E421VA - LCD
Black screen - no image using flashlight method. Standby powers on, logo lights up when plugged in. No sound. No obvious burnt components. No swollen caps. CPU does not seem hot.
Power supply connector - Power off - voltages
Standby - 5.2
Standby - 5.2
PS/On - 0
24v - .1
24v - .1
Gnd (3) - 0
12v -.1
12v -.1
P DIM - 0
On/Off - 0
Power supply connector - Power ON - voltages
Standby - 3.7
Standby - 3.7
PS/On - 3.0
24v - 25.2
24v - 25.2
Gnd (3) - 0
12v - 12.4
12v - 12.4
P DIM - 2.5
On/Off - 0.1
The On/Off at 0.1v seems suspicious. I'm not sure, but I think this supposed to tell the Power Supply to send voltage to the inverters(?)
Other data, if it helps.
Connector CN4402 - T-Con board, with power on:
Gr - 12.4
Yel - 12.4
Or - 0
R - 0
Br - 3.6
Bl - 3.6
Data cable on T-Con - no voltages on any of the lines.
Disconnecting both T-Con power and data cables and cycling power made no difference.
The 2 single wires that run from the Power Supply to the inverters (?) - no voltage.
I'm assuming that there's something wrong with the main board, but no one has them in stock. So I'll try to fix at the component level.
What should I check next?
Vizio E421VA - LCD
Black screen - no image using flashlight method. Standby powers on, logo lights up when plugged in. No sound. No obvious burnt components. No swollen caps. CPU does not seem hot.
Power supply connector - Power off - voltages
Standby - 5.2
Standby - 5.2
PS/On - 0
24v - .1
24v - .1
Gnd (3) - 0
12v -.1
12v -.1
P DIM - 0
On/Off - 0
Power supply connector - Power ON - voltages
Standby - 3.7
Standby - 3.7
PS/On - 3.0
24v - 25.2
24v - 25.2
Gnd (3) - 0
12v - 12.4
12v - 12.4
P DIM - 2.5
On/Off - 0.1
The On/Off at 0.1v seems suspicious. I'm not sure, but I think this supposed to tell the Power Supply to send voltage to the inverters(?)
Other data, if it helps.
Connector CN4402 - T-Con board, with power on:
Gr - 12.4
Yel - 12.4
Or - 0
R - 0
Br - 3.6
Bl - 3.6
Data cable on T-Con - no voltages on any of the lines.
Disconnecting both T-Con power and data cables and cycling power made no difference.
The 2 single wires that run from the Power Supply to the inverters (?) - no voltage.
I'm assuming that there's something wrong with the main board, but no one has them in stock. So I'll try to fix at the component level.
What should I check next?
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