Christmas, I shop a collective out of joy, carnival into the night 2:00 after eating barbecue could not sleep, up and repair A8M. Customer sent internal display is not lit there is no word, add-in is good. This situation a bit strange, high-pressure or a lamp or bad that screen there must be some word ah, it is the screen line and screen, screen line and motherboard interface I can only one check, and according to my maintenance experience, one has not been repaired countless The machine can not display line or screen high-pressure lamp is unlikely to a bad two, more than two. So, first check the motherboard and the screen-line interface, the problem is not the first rule and found himself or herself, to do high-pressure board-point for the next screen lamp bright exclusion, and got a screen for a month the same situation, screens are also excluded, and on the left screen line, and I up and down both sides of a one amount, but also a good ah. This even-screen lines are also excluded. Canadian welding the next screen wire interfaces and high-voltage interface, billows. Prior to repair case, the graphics cold solder joint will also appear this situation. Lazy, directly on the BGA plus welding graphics. The same situation. It seems I can only step by step and checked. More than 1 hours had passed, I will light screen panel above the fuse voltage-free, high-pressure plate above the switch signal is not, 3.3V. With the screen-line interface 30.27.29P figured as + LCD-VCC, high-pressure plate 6P for + LCD-VCC,
Took over the L7 to the Q5 4P get out, good, it seems clearly one issue that came out, 4P-free 3.3V OUT, then the amount of Q8A 2PLCD-VDD-EN, 3.. 3V ah, this proved that with the Northbridge does not matter, and on this line the above questions, the amount of D1-free 3.3V, note that, the drawing above is to Q8A, Q8B separate mapping, the physical top on a Q8 6P pipe. R192 above have 3.3V, night vision is not good, with a magnifying glass a look, R192 resistance corrupted. Drag welding resistance, 3.3LCD-VCC out, and a resistor got to me dawn, and I would like to go home to bed. For maintenance or carefully is the first to be a few. . . . . . . . . . .
English 
العربية