LCD TVs are now entering the maintenance period, the power supply part of the fault accounted for the majority, and now many machines pay for the power supply using the 6575 management chip, and the most common fault with the 6755 power supply is occasionally not booting, or suddenly power off after the power, After a while, it will work.
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Here are two examples of non-boot failures caused by the 6755 power chip:
1: A Konka 42-inch LED TV, the user reflects that the night is good, the second morning does not turn on the indicator light. I disassemble the machine, +5V no output, the fuse is intact, +300V is normal, check the secondary has no short circuit, check the power chip 6755 6th foot + VDD3.2v normal, 1 foot by +300v via 1M resistor step-down power supply is also normal , the 5th foot has no drive voltage output. After replacing the 6755 with the maintenance experience, the power supply returned to normal and the fault was eliminated.
2: Panasonic 50-inch plasma: The user reflects that the machine does not turn on after a sudden power failure during normal playback, and sometimes it can malfunction normally after a period of time. The disassemble check is also +5 no output, the fuse is intact, the 6575 chip has no drive voltage output at 5 feet, and the power is turned on after replacing the power supply chip 6755.
Combined with the experience in maintenance, the 6555 power management chip machine, Oul does not start or suddenly power off does not start, the fuse is good +300 normal, most of the power chip 6755 itself problem, you may wish to replace the power supply when you encounter the same fault Chip 6755, will get twice the result with half the effort, the above experience is combined in the repair, we have any better experience can be shared together to learn together
November 25, 2022