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Showing posts from January, 2013

Apple A1181 Repair

 The A1181 this machine I repair to three a 945 a 965, I heard there is a single bridge, but no repair to ado, disassemble it, hundreds of times. Ripped out the motherboard will. This motherboard K36A OEM number. The motherboard around the CPU above a lot of traces of corrosion of the influent. (I do not have a camera..) First test several large inductance of the main power, and did not see signs of a short circuit. It seems the problem is not large. The location clean water. So dry the power-on test. There is no standby voltage. DC first micro-power indicator light (normal in this board is not connected to the CMOS battery should be self-boot). Isolation protection circuit should not be working properly, open the drawing test. First find the   F6900 The test voltage of about 16V, no output level after the test D6901. Playing the output stage to resistance around 500, seems stage short-circuit. Measured the amount of D6901 pros and cons are infinite, open circuit, the fi