Hisense TPW4211 plasma maintenance information - remember the hard experience of the first plasma maintenance of Xin Yonghua - appliance repair - Huaqiang Electronics

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

MOS power IC full range

Photocoupler

In July 2010, I came across a Hisense TPW4211 plasma TV that had no sound and a black screen. I had never worked on an LCD plasma TV before, but I was eager to practice. The customer said they would go home, so I decided to take a look myself. The TV looked intact with no visible damage. I did some research online and found that many people were talking about capacitors C523 and C524 being too close to the heat sink, causing them to degrade over time due to high temperatures. They suggested replacing those capacitors. I didn’t want to pay for repairs, so I asked the after-sales service to check it. They said they’d charge 50 yuan for the inspection if it wasn’t repairable. I agreed. Later, they told me the power board was faulty and quoted me 1,200 yuan. But since the user had already moved, I got it for a lower price. After thinking it over, I realized 1,000 yuan was still expensive. I feared it might fail again later. So I consulted a senior engineer who said there was no such issue. I then decided to open the board and see what was wrong. I hadn't considered buying online before, but during the Spring Festival, I saw a power board for sale online at just 400 yuan. However, I was worried about the quality and reliability of mail-order parts. So I put it aside. Eventually, I joined an online forum where many tech enthusiasts shared their experiences. Inspired by their stories, I decided to try repairing the power board myself. It was a big TV, costing over 10,000 yuan back then, but I just wanted to learn. I spent several days on the forum, making new friends and learning from others. Power Board Text: When I tested the power board, the relay clicked, and the power supply seemed okay. I checked the small LED on the logic board. If it stayed lit, it meant a problem with the signal processing board. I checked for short circuits in the signal board’s power supply and whether the high-frequency section was getting power. I also checked the VPC3230D’s power supply. If the LED blinked steadily, the signal and logic boards were fine, and the issue was likely in the drive circuit or the rear stage of the power board. After observing the LED, I noticed it blinked steadily, which meant the signal and logic boards were working. The problem was probably in the drive circuit or the power board's rear stage. I removed the power board and shorted the PS_ON pin of CN802 to ground. If the board worked, the voltage on each channel should be normal. The standby 5V was fine, and the VS voltage slowly rose to 30V (it should reach 91V). The B+PFC voltage was 380V, which was normal. This indicated the power board had issues. I carefully measured the components and found two capacitors were damaged. I replaced them using parts from a scrap board. Test machine, hahahaha! ! ! I can’t even describe how happy I was! I saved a 13,000 yuan plasma TV without spending a penny. What a great feeling! Here are some details about my repair process. I hope this helps others. Also, plasma TVs aren’t as hard to fix as they seem! Plasma TV TPW-4211 principle and maintenance.part1.rar Hisense tpw42110.pdf Plasma TV TPW-4211 principle and maintenance.part2.rar

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