Re: LiteOn PA-6601-1A (600w) blows its TOP
The transformer is connected between pin7 of the TOP and +160VDC. So 160VDC found on pin7 means that the TOP is frozen (and the MOS permanently off), isn't true?
Unfortunately I can't connect the oscilloscope because the probe ground is connected to earth, and even if I have fed the PSU with a 220V to 110V insulating transformer my RCD trips! I don't know if it is safe to disconnect oscilloscope earth from mains plug to do these tests.
So there are more cases:
1. My TOP is already blown
2. My TOP works and my meter cannot read 160VAC@130kHz
3. The little differences in pin voltages do make the difference
The transformer is connected between pin7 of the TOP and +160VDC. So 160VDC found on pin7 means that the TOP is frozen (and the MOS permanently off), isn't true?
Unfortunately I can't connect the oscilloscope because the probe ground is connected to earth, and even if I have fed the PSU with a 220V to 110V insulating transformer my RCD trips! I don't know if it is safe to disconnect oscilloscope earth from mains plug to do these tests.
So there are more cases:
1. My TOP is already blown
2. My TOP works and my meter cannot read 160VAC@130kHz
3. The little differences in pin voltages do make the difference
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