Hello all, I've been troubleshooting some issues with our TV and got to a point over the weekend where I just was not sure whether I should get a replacement T-Con board or consider the LCD potentially faulty and just get a new TV.
Background -
Sony Bravia KDL-40XBR6 we have had since late 2008. About a week and a half ago came home one day and it would not come on. Was getting 3-blink error (mainboard or PS). I did some troubleshooting and it appeared that PS was ok and mainboard had issues. I was able to track down at least one blown pico fuse on it and a mosfet bank IC that had smoked. I ordered those and soldered them in when I got them as well as another used mainboard off ebay just in case I could not fix it. The spare mainboard was for a KDL-46XBR6 but same model board and I had read that it should be interchangable. After soldering in the replacement components it made it a bit further but found an additional pico fuse blown I did not catch the first time around. Got that ordered and soldered in. Once I put it back together screen powered up and looked like it was coming up but then began to fail with vertical stripes and/or 14blink message. Swapped out mainboard for other one I had gotten on ebay and that got rid of the stripes but still failing with 14blink HFR error. Ok that is where I am right now.
Here are the last few things that I was hoping for some expert feedback on.
When power is applied now the LCD backlights turn on and I get a brief few second screen on the LCD saying system time was lost, etc before it shuts off and starts the 14blink error. I checked power at the PS and all the 12V reg lines going to mainboard read 11.9V, 3.3standby reads 3.3. On the T-con board I am also reading 11.9V and all the fuses appear to be intact. The service manual I was able to find did not have a schematic for the T-Con board though so I may be missing some if they are on the back of the board.
Is it possible that the T-Con board could still have gone bad when I am seeing that brief output on the screen? Should I replace that or is it more likely there is an issue with the LCD itself?
Thanks for any response.
- Aaron
Background -
Sony Bravia KDL-40XBR6 we have had since late 2008. About a week and a half ago came home one day and it would not come on. Was getting 3-blink error (mainboard or PS). I did some troubleshooting and it appeared that PS was ok and mainboard had issues. I was able to track down at least one blown pico fuse on it and a mosfet bank IC that had smoked. I ordered those and soldered them in when I got them as well as another used mainboard off ebay just in case I could not fix it. The spare mainboard was for a KDL-46XBR6 but same model board and I had read that it should be interchangable. After soldering in the replacement components it made it a bit further but found an additional pico fuse blown I did not catch the first time around. Got that ordered and soldered in. Once I put it back together screen powered up and looked like it was coming up but then began to fail with vertical stripes and/or 14blink message. Swapped out mainboard for other one I had gotten on ebay and that got rid of the stripes but still failing with 14blink HFR error. Ok that is where I am right now.
Here are the last few things that I was hoping for some expert feedback on.
When power is applied now the LCD backlights turn on and I get a brief few second screen on the LCD saying system time was lost, etc before it shuts off and starts the 14blink error. I checked power at the PS and all the 12V reg lines going to mainboard read 11.9V, 3.3standby reads 3.3. On the T-con board I am also reading 11.9V and all the fuses appear to be intact. The service manual I was able to find did not have a schematic for the T-Con board though so I may be missing some if they are on the back of the board.
Is it possible that the T-Con board could still have gone bad when I am seeing that brief output on the screen? Should I replace that or is it more likely there is an issue with the LCD itself?
Thanks for any response.
- Aaron
Comment