To summarize, I found this TV by the side of the road with a sign saying it needs a backlight.
I opened it up and saw four diodes had burned, and a bunch more scattered around tested as bad.
This TV has six rows, each consisting of two strips that link together.
I replaced all the LED strips.
Now only one half (the lower half) light up. The upper half do not.
I tested voltage output from the board. Sure enough, the lower half shows 300 V DC when the LEDs are disconnected, and the upper half output shows nothing.
I suspect when the LEDs shorted closed circuit, the owner kept running it and put addition load on the driver circuitry? I don't know a lot about this.
The power board is BN44-00670A. It also has L65G1_DHS on it.
A schematic, anywhere to look would really be appreciated. Maybe a MOSFET went bad? I'm so close to getting this one fixed! Thanks.
I opened it up and saw four diodes had burned, and a bunch more scattered around tested as bad.
This TV has six rows, each consisting of two strips that link together.
I replaced all the LED strips.
Now only one half (the lower half) light up. The upper half do not.
I tested voltage output from the board. Sure enough, the lower half shows 300 V DC when the LEDs are disconnected, and the upper half output shows nothing.
I suspect when the LEDs shorted closed circuit, the owner kept running it and put addition load on the driver circuitry? I don't know a lot about this.
The power board is BN44-00670A. It also has L65G1_DHS on it.
A schematic, anywhere to look would really be appreciated. Maybe a MOSFET went bad? I'm so close to getting this one fixed! Thanks.
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