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TCL color TV AT25266B no video failure repair - android - Phones Developers
The TCL TV model AT25266B is experiencing a video issue. Specifically, the video 1 input has no sound and no image, while the video 2 input also shows no picture. Initially, I thought the problem might be with the AV cable or the external DVB receiver, but after testing with different cables and devices, the issue remained. This led me to conclude that the problem was with the TV itself.
After opening the TV, I found two 4052 ICs responsible for video conversion. I first replaced the 4052 chip on video 1, as it was suspected to be faulty due to the lack of sound and image. However, after replacement, the issue persisted. That made me question whether the problem was actually with the 4052 chips or something else, like the main processor.
I then considered the possibility that the second 4052 (for video 2) could be faulty and might be affecting video 1 as well. So I swapped the 4052 from video 1 with the one from video 2. After retesting, both video inputs worked perfectly—image and sound were restored. It was a surprising but successful fix.
Now, I'm trying to understand why a faulty 4052 on video 2 would cause issues on video 1. According to some experts, the two 4052 chips serve different functions: one handles audio conversion, and the other handles video conversion. In this case, the "video 1" input was actually being handled by the audio conversion chip, while "video 2" was the real video converter. If the video conversion chip (video 2) was damaged, it could affect both video 1 and video 2, leading to the observed symptoms.
This experience taught me to double-check component functions and not assume that each input corresponds directly to its labeled function. Sometimes, the root cause lies in a different part of the system than initially expected. It's always good to approach repairs step by step, especially when dealing with complex circuits like those found in modern TVs.