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LCD TV common fault summary
LCD TV common fault summary
LCD TV common faults, no matter what kind of electrical appliances have been used for a long time, there will be a variety of faults, today we look at the common faults of LCD TVs:
Fault one; black screen
The screen must be bright to meet two conditions; first, the 24V of the power board to the backlight should be normal. Second, the BLKON/OFF start pin voltage should be normal (generally at 3.3V/4.95V). If the 24V is abnormal, the power board should be faulty. If the voltage of BLK is not available, it should be that the motherboard has an abnormality. Both voltages are still black screen, which may be that the backlight board and the screen itself are bad.
Fault two; boot protection
The boot screen flashes a black screen. If this fault occurs, the startup voltage of 24V.BLK is measured during protection. If it is normal, it is definitely a bad backlight. The sound of the boot protection is generally bad. (Note: Xoceco HU models are more chaotic, the power board is divided into several types, there is a power board suffix with a small board, this small board plays the role of backlight control, he will also cause boot protection, there is When there is an aging black screen, there is a sound.
Fault three; no characters
A boot screen does not have a PRIMA display without a blue screen, and the backlight is lit. There are several reasons for this failure: First, the motherboard. Second, the logic board. Third, the screen itself. Whether the motherboard is bad or not, as long as the power supply to the logic board is normal, the normal voltage is generally 5V or 12V. If this voltage is positive, the motherboard is good. The logic board can only be replaced. If the fault persists after replacement, it is definitely the screen itself is broken. (Note: The possibility of a bad motherboard is very small, almost no need to apply for a motherboard)
Fault four; white screen
If there is a white screen failure, the motherboard does not need to be replaced, and the logic board is replaced first. If the fault persists, the screen itself is bad.
Fault five; Huaping
If there is a flower screen failure, it is best to provide a photo to further reduce the fault.
The above is for you to introduce some common faults of LCD TVs. Non-professionals should not operate.