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

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Skyworth LCD TV 26L08HR faulty machine, boot image is light, flashing, color trailing, this phenomenon is generally caused by logic board failure. Disassemble, logic board and screen COF board are integrated, it is impossible to change the logic board. Measuring VIN12.15V normal, VGH28.8V, VGL-5.35V, VDC3.28V, VDA13.3V These voltages are normal, only 3.5V when measuring VSCM voltage, the problem is here, VSCM is what we usually say VCOM voltage That is, the internal voltage of the drain of the TFT inside the screen. After carefully checking the RC component of the VSCM circuit, no bad is found. Finally, it is found that the VSCM voltage is applied to the screen through a REF adjustable resistor. Traced, washed with washing water, adjusted, VSCM voltage has changed, the image has also improved, indicating that the resistance is not bad, but the rust is not good contact, the resistance is wrong. Then adjust the VSCM voltage to the normal value of 6.3V, the VSCM voltage is about half of the VDA voltage, normal is best not to exceed half of it, the image is normal, colorful, fault repair. In fact, the failure of the logic board is not so complicated by some friends. Any fault phenomenon will eventually appear on the voltage of the relevant circuit. Only careful analysis will carefully measure the voltage at the key point and eventually find the faulty component. Maintenance experience, poorly written, shared with friends in the same industry.