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TCL color TV AT25266B no video failure repair - android - Phones Developers
I recently visited a customer's home to diagnose a TCL TV model AT25266B. Upon testing, I found that Video 1 had no sound and no image. I tried replacing the AV cable, but the issue remained. Then, I connected a Panasonic DVB box from the customer, but the problem still persisted. When switching to Video 2, there was also no picture.
From this, I concluded that the AV cable and the "Snow White" S6 receiver were not at fault. The issue must be with the TV itself. I opened the back panel and discovered two 4052 video converters on the board. I first replaced the 4052 responsible for Video 1 (which had no sound), but after testing, the fault remained unchanged.
At this point, I was confused. If the 4052 for Video 1 was faulty, replacing it should have fixed the issue. But both Video 1 and Video 2 were still not working. Could it be that the main chip was damaged? That would complicate things significantly.
Instead of jumping to conclusions, I decided to think more carefully. What if the 4052 for Video 2 was faulty, and that was affecting Video 1 as well? I considered swapping the 4052 from Video 2 with the one from Video 1. Since the original Video 1 4052 had already been replaced and didn’t cause any improvement, I assumed it was working properly. So, I swapped them.
To my surprise, after the swap, both Video 1 and Video 2 worked perfectly. The image and sound were clear, and even when connecting to the sixth signal source, everything functioned normally.
Now, I’m reaching out to experts to understand why a faulty 4052 in Video 2 could cause Video 1 to fail completely, resulting in no image and no sound. It seems like the two channels are more interconnected than I initially thought.
Chen139691 explained that these two 4052 chips serve different purposes: one handles video conversion, while the other is responsible for audio. In this case, what the user called Video 1 is actually an audio converter. When the video conversion block (Video 2) fails, it can cause both Video 1 and Video 2 to malfunction.
Yang Donglin added that AV1 and AV2 are handled by separate 4052 chips—AV1 handles both video and audio, while AV2 is dedicated to video only. Understanding this distinction makes troubleshooting much easier. The repair involved replacing the audio conversion chip first, then the video conversion chip. With the right approach, even complex issues can be resolved efficiently.