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Old 6th August 2013, 07:51 PM   #21
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Im back in the heat sink, i rechecked the outputs, I have 6 IRF9640 and 4 IRF640, none seem to be shorted.Any suggestions what to go next. with it cycling so quickly will it be hard to get any real readings?

Last edited by dartssport; 6th August 2013 at 08:01 PM.
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Old 6th August 2013, 08:32 PM   #22
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Did you replace the driver transistors for the power supply FETs? They are Q05 and Q11 near the 494. Check them for open junctions as well as for leakage and being shorted.

There is at least 1 screw near the TL494 that has a silver solder pad around it. The screw with its lock-washer must be installed and tight. If that's in place and the amp won't power up, try twisting/pushing/pulling on the power transformer. Does that, at any point, allow the amp to power up?

If not, I'd recommend removing the main rectifiers to see if that will allow it to power up. After removing them, make sure that there are no solder bridges between the pads on the top or bottom of the board.
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Old 6th August 2013, 10:40 PM   #23
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I replaced Q05 and Q11 nothing seems out of order there. I twisted and pulled on the power supply nothing, the main rectifiers are FMU34S and FMU34R?
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Old 6th August 2013, 10:59 PM   #24
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Yes. Those are the rectifiers.

Before you pull them (after removing the amp from the sink), power the amp up for a few seconds and then remove power. Which of the heatsink mounted components begin to heat up?
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Old 6th August 2013, 11:05 PM   #25
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The fets start to heat up first after 3 cycles
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Old 6th August 2013, 11:11 PM   #26
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Both the power supply and the output transistors are FETs. Which are you referring to?
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Old 6th August 2013, 11:13 PM   #27
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power supply
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Old 6th August 2013, 11:17 PM   #28
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If the output transistors are remaining completely cool, remove the rectifiers and see if the power supply will power up without the FETs overheating.
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Old 6th August 2013, 11:34 PM   #29
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The rectifiers are out and the amp powers up with no issues.
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Old 6th August 2013, 11:50 PM   #30
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Check the rectifiers to see if they're shorted.
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