Hi folks.
So this thing has been in storage for a while and I got it back home yesterday. Amazingly it turned on with no problems... until I opted to install the latest software. The download went fine, then the update process began (a spinning arrow) and it appeared to complete because the picture came back. Then it powered down, flashed red three times in a loop, and wouldn't turn back on again. Attempting to power up resulted in a couple of relay clicks and that's it.
Following the service manual, it indicated that I had a bad main board. I figured this might have been corrupted firmware but maybe it was coincidence. Testing the power board I was getting 3.3V standby voltage on pin 27 of CN6401, plus when I tried to power on I would get 12V supply momentarily on the relevant pins.
Next I removed and tested the filter caps. They all appeared to be within 5% tolerance but I can't measure ESR at the moment so inconclusive. Refitted the caps, installed the board - same error. But when I started measuring voltages at the other end of the connector on the main board, the backlight came on and it suddenly started working! Of course by the time I had screwed the rear panel back on and tried it again it didn't work, but now it's a different problem. The TV powers on but there's no backlight.
I reckon it's the power board, but I wondered if anyone can provide reference voltages for the LD connector? I'm measuring 41.3V on the VLED_VCC pins, but I'm sure I measured 36V earlier.
Thanks.
So this thing has been in storage for a while and I got it back home yesterday. Amazingly it turned on with no problems... until I opted to install the latest software. The download went fine, then the update process began (a spinning arrow) and it appeared to complete because the picture came back. Then it powered down, flashed red three times in a loop, and wouldn't turn back on again. Attempting to power up resulted in a couple of relay clicks and that's it.
Following the service manual, it indicated that I had a bad main board. I figured this might have been corrupted firmware but maybe it was coincidence. Testing the power board I was getting 3.3V standby voltage on pin 27 of CN6401, plus when I tried to power on I would get 12V supply momentarily on the relevant pins.
Next I removed and tested the filter caps. They all appeared to be within 5% tolerance but I can't measure ESR at the moment so inconclusive. Refitted the caps, installed the board - same error. But when I started measuring voltages at the other end of the connector on the main board, the backlight came on and it suddenly started working! Of course by the time I had screwed the rear panel back on and tried it again it didn't work, but now it's a different problem. The TV powers on but there's no backlight.
I reckon it's the power board, but I wondered if anyone can provide reference voltages for the LD connector? I'm measuring 41.3V on the VLED_VCC pins, but I'm sure I measured 36V earlier.
Thanks.
Comment