Repairing a Konka LED32F3300CE, the phenomenon of failure, plugging in the main power supply flashing red light, press the button, press the remote control to turn on the red light does not flash but still does not boot, the machine is a three-in-one integrated board, first saw this head It is big, when the red voltage of the measurement voltage flashes, 3.3V and 2.5V are normal, but 100V and 12V are only half. After pressing the button and pressing the remote control, the voltage is the same (later know that only half of the standby time), so I immediately went to the forum to find the drawings. Find information. . . There are two common problems with this machine, one is the two voltage regulators are bad, one is the power supply chip used 6755, first find two regulator tubes to remove the test machine failure is still, there is no 6575 chip in hand, online check information Can be replaced with 1271, there are just two in the hand, after the replacement, the fault is still the same, no problem, most of the online said that the 6755 chip problem will be able to boot for a while, it will not be able to boot from a treasure 6555 chip Come back, the fault is still the same, there is no way, the main power supply red light flashes and flashes to prove standby, press the button, the remote control after the red light does not flash, prove the boot. . It is suspected that the red light flash is unstable voltage, and the resistance of the sampling circuit chip resistor is checked one by one against the drawing. . . It was found that the resistance of a sampling resistor of 100V became smaller, and it was immediately changed. . Then boot, the red light is on and not flashing, the second boot is normal, and it is in the machine.
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