One day, a middle-aged woman came into the store asking if I could repair her LCD TV. I asked for the size, and she said "42." I agreed to take it in, thinking that the front section had already found someone to replace the board, which cost over 900 yuan, and only the machine was included. I was shocked inside—had maintenance fees really gone up so much? Later, I realized that the shop had probably overcharged.
I scheduled a time to come to her house. When I arrived, the TV screen looked faintly white, and I suspected some kind of fraud. Checking the back, I saw it was actually a plasma TV, not an LCD! I hadn’t repaired plasma TVs before, and I didn’t know much about them, but I wasn’t going to pay that kind of fee just for a diagnosis. When I turned it on, the power indicator blinked a few times and then died. She mentioned that sometimes the front section could still turn it on, but now it wouldn’t light up at all.
After opening the unit, there were no obvious signs of previous repairs, but I suspected the motherboard might be faulty. I told her to bring it back to the store for further testing. If I couldn’t fix it, I would have to increase the price.
Back at the store, I did some online research, but found very little information on plasma TVs. The screen model was Samsung S43AX-YB01/YD01, and I couldn’t find a self-test method. After trying several tests, nothing worked. I measured the power board’s 5VSB and noticed it was unstable. The motherboard sent a normal boot signal, and the voltages from each channel were mostly normal, but the VS and VA voltages dropped suddenly to near zero, and PS-ON went high in standby. Forcing a boot didn’t help. Repeatedly unplugging and plugging cables didn’t work either. When I removed some cables, the VS voltage didn’t rise. During the power-on test, I heard a “click†sound, and the Y-board screw wasn’t properly attached. I measured and found that the VSVA was zero, and the Y-board had one IGBT shorted and several fuses open.
I suspected the power board was faulty, but even replacing it didn’t solve the problem. It turned out the power board was modified, which made things more complicated. I went to the same place and got an old Y-board, replaced the IGBT, and tried it again. The machine booted up with sound, but the screen still didn’t light. After multiple attempts, the new IGBTs kept burning out. I was really worried, and the customer called me every day reminding me.
Finally, I decided to buy a full set of boards from Taobao (XYZ or something like that), and after repairing, I returned the old board for red and black. I thought as long as the screen wasn’t damaged, I’d fix it even if it was an old version.
Today, I opened the package and found just a single Y-board. I contacted the seller and said, “Sorry, I’ll get it replaced immediately.†I took the Y-board machine and tested it—it worked perfectly, with good sound and image. I returned it to the seller and said I didn’t have time to wait. I already used SF Express to send it back to them at the exchange price. At this point, my heart felt relieved. After several hours of testing, everything was fine. I will contact the owner tomorrow and send it back to her.
This was my first time repairing a plasma TV, and it was quite embarrassing. I think the power board had been broken before, and I accidentally damaged the Y-board. It was really awkward. I went to a forum for help, and although I couldn’t find a solution right away, I finally managed to fix it. In the end, I charged her green, blue, and brown, and didn’t lose anything.
To sum up, here are some tips for beginners:
1. Don’t quote prices for plasma TVs. The Y-board is expensive and often the weak point. Many faults can’t be accurately diagnosed.
2. Test the power board separately. Usually, ground PS-ON, connect VS-ON to D5.3V, and use a 100W bulb to check load capacity. Make sure other voltages are normal.
3. Some boards must be fully connected during testing. Otherwise, the consequences can be serious. This particular Y-board had grounding issues and fuse resistors.
4. If you’re unsure about the screen’s self-test method, don’t try it. Some cables may damage the board if unplugged while powered. Unplug the cable tester, reinsert it, and wait for the voltage to drop before plugging it back in.
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