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Re: Proscan inverter board won't power o, Any ideas?
you din't mention what happened after you disconnected the main board. unplug and plug is not bypassing.to bypass the main board you have to keep it disconnected.if the back lights come on and stay on after main board disconnected, the main board is defective.
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Sounds like a mainboard/Digital board. Might be the panel too. Vizio makes substandard TVs and they tend to fail very easily. As much as I like to see devices repaired, this one may not be worth your hassle. Power problems caused by lightening can be the most damaging. You may even need both power and digital boards to repair it. I would buy boards from someone who will take them back in case the panel failed too.
KDF 60XS955 intermittently turns off green light blinking then on after...
The frequency and color of the blinks will indicate the issue. There is a hold-down button sequence to try to backdoor your way into the set to see if the panel will light. You may have simply racked up too many "weird tuner faults" and need to reset it. My suspicion is that it's either that or bad panel backlight.
Unplug set, press and hold (on set) volume-down and channel-down and hold them while pluging in set. Will come on with "k" on screen, or will crash again if backlight bad. If it stays on, use your remote and arrow right then look for "fact init" and any other reset and turn them on. Arrow back up to "fact init" and hit enter. Let set recycle to green and unplug/re-plug in 5 seconds: the set should be in OOB state
ref: Sharp lcd tv power button flashing
Just FYI: I had a friend with an Insignia NS-32E570-A11 with a backlight problem, and it turned out to be one of the actual LEDs in the backlight array was burned out, causing some sort of over-voltage condition that made the backlight sometimes work, and sometimes just flicker for a moment at TV startup and then turn off. We took the panel apart and bypassed the one bad LED (it had a dark spot on it and failed continuity - you can test each LED with a continuity tester and see them light up!), and now the TV/backlight works! Be aware this is tricky bypassing the bad LED, as it is ultrasonically welded to the LED array strip (same technique used to make ICs), so you need to be a very good solderer to bypass it without it breaking the connection.
Note that if it is a backlight inverter board problem you will still have sound. SInce you have no sound I would suspect a power supply or main A/B board malfunction. Do you know how to use a multimeter?
Hi Leslie, It could be your power supply is dead. The 4 cable wire is the 12v axillary power supply for the graphics. When unplugged you will get no graphics when plugged in nothing will work if that rail of the power supply is faulty. Hank
may be a mainboard problem. If you can see the orange light it usualy means that there is power running through the TV... usually inverter boards are a problem when you do not see any backlight at all.