Re: No power (blackscreen) with MD3021PH -> AI-0088 the reason?
The AO4606 is actually two FETs in one package. Pins 1, 2, 7, and 8 are the N-channel FET while pins 3, 4, 5, and 6 are the P-channel FET. Of these, pins 2 and 4 are the gates. A problem on the gate drive signal would most likely be responsible for the premature failure. I would trace the signals back to the inverter controller IC, looking for a problem with a diode, resistor, or capacitor.
I was able to trace visually back to JP2 and JP3; beyond that I would investigate the components and solder joints in the area of D101 and D102.
PlainBill
The AO4606 is actually two FETs in one package. Pins 1, 2, 7, and 8 are the N-channel FET while pins 3, 4, 5, and 6 are the P-channel FET. Of these, pins 2 and 4 are the gates. A problem on the gate drive signal would most likely be responsible for the premature failure. I would trace the signals back to the inverter controller IC, looking for a problem with a diode, resistor, or capacitor.
I was able to trace visually back to JP2 and JP3; beyond that I would investigate the components and solder joints in the area of D101 and D102.
PlainBill
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