Hey everyone, thanks for taking a look at this issue.
I've received a TV that I was tasked to fix by my father in law (if possible).
The main issue is there is no backlight and no display. I've attempted the flashlight trick and am getting no indication any pixels are being lit etc. the green power led does come up on the front of the TV, and the unit is responsive to the remote control etc.
So I disassembled it last night after reading a Vizio W37 thread on here that was of great help to me. I was able to diagnose some things
I've verified that the 3.3V input from the Main board to the PSU is good, and I am getting the full 5 volts on the PSU side. I am NOT getting 12VA (pins 3,4) and am also not getting 12VCC (pins 8,9) (Picture 1)
I am also not getting voltage on the 24VLED outputs to the inverter. (Picture 2)
I've traced this back to the secondary side of the transformer. When I power on the TV I get 1-2 volts with the meter, for roughly 1 second, and then it goes back down to zero.
I found a refurbished power supply board on ebay and just ordered it. It has a 14 day money back guarantee. But I wouldn't mind trying to find out the faulty components and maybe repairing this one and selling it to recoup the costs.
I've verified i'm getting voltage off of the big capacitors (getting 167v on each one) But im not sure if that is within the spec. Next to try is the rectifier circuit voltage. I've verified the AC fuse is good (first thing i checked).
Does anyone have the spec/manual on the Chicony PK101V3120I power supply board handy? I've been looking all over online and can't find one for it. Even emailed Chicony and haven't heard back at all.
Thanks for any/all help ahead of time.
I've received a TV that I was tasked to fix by my father in law (if possible).
The main issue is there is no backlight and no display. I've attempted the flashlight trick and am getting no indication any pixels are being lit etc. the green power led does come up on the front of the TV, and the unit is responsive to the remote control etc.
So I disassembled it last night after reading a Vizio W37 thread on here that was of great help to me. I was able to diagnose some things
I've verified that the 3.3V input from the Main board to the PSU is good, and I am getting the full 5 volts on the PSU side. I am NOT getting 12VA (pins 3,4) and am also not getting 12VCC (pins 8,9) (Picture 1)
I am also not getting voltage on the 24VLED outputs to the inverter. (Picture 2)
I've traced this back to the secondary side of the transformer. When I power on the TV I get 1-2 volts with the meter, for roughly 1 second, and then it goes back down to zero.
I found a refurbished power supply board on ebay and just ordered it. It has a 14 day money back guarantee. But I wouldn't mind trying to find out the faulty components and maybe repairing this one and selling it to recoup the costs.
I've verified i'm getting voltage off of the big capacitors (getting 167v on each one) But im not sure if that is within the spec. Next to try is the rectifier circuit voltage. I've verified the AC fuse is good (first thing i checked).
Does anyone have the spec/manual on the Chicony PK101V3120I power supply board handy? I've been looking all over online and can't find one for it. Even emailed Chicony and haven't heard back at all.
Thanks for any/all help ahead of time.
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