I saved another screen! This is a repair log for a Skyworth 20L98TV. A few days ago, I got a call from a customer saying their TV wasn’t working. I asked them to come over for a repair. I asked about the model and brand, but they didn't know—just said it was several years old, worth thousands of dollars, and now there's no sound or image. It was mounted on the wall, and I thought it was a big job. But when I arrived, it turned out to be an elderly man in his 60s who enthusiastically showed me a 20-inch Skyworth TV hanging on the wall. I thought it would be a good repair, but as soon as I saw the model, my heart dropped. It was the old 20L98TV, which is known for being tricky to fix. The customer mentioned that he had already called another repairman, who suggested replacing the mainboard, but the problem remained. Then they said the screen was broken and that changing it would cost a lot. They even said not to change the screen and just buy a new one. But then they claimed a friend told them I could fix it. I joked that fixing the screen is like doing a major surgery on a patient—it’s risky. I warned them upfront that if anything went wrong, I couldn’t guarantee it, but I offered to fix it at a reasonable price. He agreed and let me take the TV home.
At night, I opened the TV and found that the screen was very dim. It was an AU screen, model A201SN02. I powered up the logic board with 5V and checked the power supply from the motherboard and power board. Everything looked normal. When I disconnected the screen cable, the display was bright, but when connected, it turned gray. From the brightness changes, I suspected some components on the logic board weren’t functioning properly. However, there wasn’t much information available on the logic circuit, and without pin data, it was hard to trace the issue. I took a break, sipped some tea, and thought about what could be wrong. Then I noticed the screen felt slightly warm. I decided to try the temperature test—turning it off and checking each component one by one. When I touched an IC labeled AS34-G, it was extremely hot, almost unbearable. I quickly cooled it down and tested again. After a minute, other parts were just warm, but the AS34-G stayed too hot to touch. I first checked the external components—capacitors, resistors, and transistors—but they all tested fine. I concluded that the AS34-G was faulty. I ordered a replacement from a local supplier, installed it, and to my surprise, the screen came back to life! It was a real miracle.
Here are some photos of the repair process. I’m still a rookie, not an expert, but I’ve learned a lot through hands-on experience. Feel free to leave comments or ask questions—I'm always happy to help!
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