During the on-site maintenance of a Changhong 3D58B6000i smart LCD TV, the issue was that the screen would automatically dim to zero after a failure. After observing the fault, I felt familiar with the process and started by checking the most common issues first. I removed the remote control batteries and then opened the casing to inspect the button cable. The problem persisted even after unplugging the button line or removing the sound board. The key control circuit on the motherboard didn't show any obvious short circuits, so based on past experience, I initially suspected the motherboard was damaged. However, since replacing the motherboard is expensive and not always necessary, I decided to check the peripheral circuits first.
The motherboard also had an external Bluetooth remote control receiver board. I disconnected this small board and tested the TV again. The issue was still present, but when I disconnected the volume control from the small board, the screen no longer went to zero. At this point, I realized the problem might be related to the Bluetooth receiver board. The user had a set-top box at home, so I suggested they try using it first to confirm if the issue was with the TV itself.
After a few days, I planned to replace the small board and continue troubleshooting. This case reminded me how important it is to systematically eliminate possible causes before assuming major component failure. It's always better to start with simpler solutions and only move to more complex ones when necessary.
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