During on-site maintenance of a Changhong 3D58B6000i smart LCD TV, the issue was that the screen would automatically dim to zero after a failure occurred. After observing the problem, I felt confident about the next steps. First, I checked the remote control battery and found it to be dead. Then I opened the back panel and disconnected the button line plug, but the issue remained unchanged. The key control channel on the motherboard didn't show any short circuit, so based on my past experience, I suspected the motherboard was damaged. However, since replacing the motherboard is expensive, I decided to check the peripheral circuits first.
The motherboard has an external Bluetooth remote control receiver board. I removed this small board and disconnected the volume control from the wife board. After doing this, the screen no longer went to zero. Since the user had a set-top box at home, I let them test the TV with it first. A few days later, I planned to replace the small board and continue troubleshooting if needed. This approach helped save time and costs while ensuring the customer could still use the TV temporarily.
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