I haven't posted in a while, and I'm really sorry for the long silence. Life has been busy, so I hope you can forgive me. A few days ago, a friend of mine had an issue with his Sanyo LCD TV. The symptoms were: it would boot up, but the image kept flickering with horizontal lines, sometimes turning into a single color, then going to a white screen, while the sound remained normal.
From my experience, since the audio was fine, I suspected the logic board. This particular model has a small logic board, as shown below:
I checked the voltage on the logic board and found 12V to be normal. So I immediately ordered a replacement from Taobao. After a few days, the part arrived, and I replaced the board right away, thinking the problem was fixed. But when I turned the TV on again, I was shocked—the same issue still existed.
Upon closer inspection, I noticed that when the image flickered, the sound had a slight "squeaky" noise. That made me think the power supply might be causing interference. I checked all the filter capacitors on the board, but none seemed faulty. At this point, I was stuck and didn’t know what else to do.
I lit a cigarette, stared at the motherboard for a while, and started to suspect the mainboard itself. Then I noticed that the shielded metal casing on the motherboard was slightly rusty. Maybe the TV had been stored in a damp place? Perhaps the motherboard had gotten wet and was causing some kind of corrosion?
I turned the TV back on, and the image flickered again. I ignored it and went online to play some bubble cats. After about 30 minutes, the image miraculously became stable! I turned it off, waited a few minutes, and turned it on again—but the flickering came back. However, after more than 20 minutes, the image was back to normal again!
This made me even more convinced that moisture was the culprit. I decided to take the motherboard out, wash it three times with isopropyl alcohol (no water!), make sure it was completely clean, blow it dry with compressed air, and let it air dry. After re-installing it and powering it on, the beautiful image returned—perfectly normal.
After leaving it cooling for over an hour, everything continued to work without any issues. It looks like the logic board wasn’t the real problem after all. Sorry, logic board brother—your time may come later, but not this time.
**Summary:** Sometimes, replacing parts isn’t the first step. Careful observation and a bit of patience can save you time and money. This case taught me that even a simple issue like moisture can cause complex symptoms. I hope this story helps someone out there. Thanks for reading!
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