A customer sent a Skyworth LCD TV model 42E65SE for repair. The TV would not turn on — no light and no sound. After opening the case, I checked the power supply and tested the backlight board interface by pressing the remote's standby button multiple times. The BL terminal always showed 0V. Then, I measured the output voltage of the power board, which was normal. Next, I moved to the motherboard and checked the voltages: U24/3.3V was 3.38V, U20/1.2V was 1.29V, U18/1.8V was 1.79V, and U19/5.0V was 4.98V. I also checked the big chip RTD2692D (296-pin) for power, clock, and reset signals but found nothing suspicious. Initially, I thought the motherboard was fine. However, suddenly the TV turned on, the backlight lit up, and I could hear the boot music. I could even watch the program by connecting a video signal. At first, I thought it might be a software or FLASH issue, possibly related to the motherboard (model 5800-A8R632-0P20) or a virtual soldering issue with the RTD2692D. After re-soldering the large chip, I still felt uncertain. I tried turning the machine on several times, and it worked for a while, but after about two hours, it returned to the same problem. I decided to use an oscilloscope to check the LDO outputs on the motherboard. When I scanned U24, I found some noise, and the noise was even more significant when I moved the probe to U20. This indicated a power supply issue. I replaced the filter capacitors at U24 and U20 — originally orange capacitors of 100μF/16V, which were of poor quality. I replaced them with high-quality blue capacitors of 200μF/16V. After that, I checked again with the oscilloscope and found no more noise. The output voltages stabilized: U24 was 3.28V and U20 was 1.19V. I let the TV cool down for 2–3 hours, and then it booted up perfectly without any issues. The motherboard was fully repaired. I shared this experience here in hopes that it helps others facing similar problems. Air Pressure Type Heat Shrink Tubing For Fibre Optic Connector Box Air pressure type heat shrink tubing for fibre optic connector box Air pressure type heat shrink tubing for fibre optic connector box,Heat-shrink tube,Heat shrinkable tubing,thermal contraction pipe,Shrink tube Mianyang Dongyao New Material Co. , https://www.mydyxc.com