I haven't posted in a while, and I'm really sorry for the silence. Life has been pretty busy lately, 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 interfering. Sometimes the screen turned into a single color, then went white, while the sound remained normal.
From my experience, since the audio was fine, I suspected a problem with the logic board. This particular model's logic board is quite small, as shown here:
![]()
I checked the power supply voltage on the logic board, and 12V was normal. So I immediately ordered a replacement from Taobao. After a few days, the new part arrived, and I replaced the board right away, thinking the problem was fixed. But when I turned it on, the same fault still existed—this was a real shock.
After careful observation, I noticed that during the flickering, the sound had a slight "squeaky" noise. That made me think the issue might be related to the power supply. I checked all the filter capacitors, but none of them showed any signs of failure. At this point, I was stuck.
I lit a cigarette, sat down, and stared at the motherboard. I started to think the problem might actually be with the mainboard. Then I noticed something unusual—the shielded metal cover on the mainboard was rusted. I realized this TV might have been stored in a damp place, possibly in an old person’s room. Could moisture have caused a short or leakage on the circuit board?
I turned the TV on again, and the image flickered once more. 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 back on—still flickering. But after over 20 minutes, the image was back to normal again.
This gave me a clue. I decided to take the motherboard out and clean it thoroughly. I washed it three times with isopropyl alcohol, making sure to remove any residue. After drying it with compressed air, I reinstalled it and turned the TV on. The beautiful picture came back, and after running it for over an hour, everything stayed normal.
So, it wasn’t the logic board after all—it was the mainboard, likely affected by moisture. I feel bad for doubting the logic board earlier.
![]()
**Summary:** Sometimes, even if you replace parts, the real issue might be elsewhere. In this case, careful observation and a bit of patience helped me find the real cause. I hope this story helps someone else facing similar issues. Thank you for reading!
Banana Plug Connector,Gold Lantern Type Adaptor,2Mm Black Red Banana Plug,Gold Lantern 2Mm Banana Plug
Changzhou Kingsun New Energy Technology Co., Ltd. , https://www.aioconn.com