Skyworth LCD TV 26L08HR image light, flash, color trailing fault phenomenon maintenance - android - Phones Developers

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I recently worked on a Skyworth LCD TV model 26L08HR that was showing some unusual symptoms. The boot image was flickering, with light issues and color trails. After initial checks, it became clear that the problem likely stemmed from the logic board. However, since the logic board and screen COF are integrated, replacing the board wasn’t an option. I started by checking the key voltages: VIN12.15V, VGH28.8V, VGL-5.35V, VDC3.28V, and VDA13.3V were all within normal ranges. But when I measured the VSCM voltage, it was only 3.5V — significantly lower than expected. VSCM is commonly referred to as VCOM, which is the internal drain voltage of the TFT panel in the screen. After carefully inspecting the RC components in the VSCM circuit and finding no obvious faults, I traced the issue back to a REF adjustable resistor. It turned out that the resistor had some corrosion or poor contact, which was affecting the voltage. After cleaning and adjusting it, the VSCM voltage improved, and the image quality also got better. Eventually, I adjusted the VSCM voltage to the standard value of 6.3V, which is about half of the VDA voltage — the ideal range for proper display performance. The result was a fully functional TV with clear colors and no more flickering. This experience reminded me that sometimes even complex-looking problems can be solved with simple voltage checks and careful troubleshooting. It’s important to stay patient and methodical when diagnosing electronics. Sharing these experiences helps others in the industry learn and grow.