a little troublesome maintenance experience - appliance repair

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A Sharp LCD-32L120A sound black screen, thought it was a backlight problem, I did not expect to open the cover test machine, the backlight turned out to be bright, through the upper side of the iron gap measurement edge board has 12V screen power supply, initially judged as the screen board or screen problem, Say good screen problems with the customer, need to bring back the repair, the probability of repair can be 50%, the customer agrees.
Going home to open the iron cover on the screen, revealing all the side panels, measuring the screen power supply VGH, VGL and other voltages, even zero V, returning 12V power supply is also zero, strange, 12V power supply is actually shorted to the ground, after When the TV power supply chip MAX17126 is removed, the short circuit disappears. Why is the 17126 short-circuited, and then measured to the later stage. When the 3.3V power supply is detected, it is also short-circuited. It is also a toss. When removing the MT71168 When the 3.3V short circuit point disappears.
From Wenzhou, a screen board was removed, and two chips were removed and replaced with a 12V insurance. The boot turned out to be a white screen. Later, I found out that it was the edge of the screen and the edge board. With the experience of manually changing the edge board, I was not too worried about this danger. I simply blow down the screen line and re-weld it. Powered up the test machine, and finally the small work was completed.
Another experience sharing is that the MAX17126 is the same as the CM501. I have compared it and can use it. It is recommended to buy the MAX17126 for children who can't buy a good CM501.
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