Hi all,
I have this 5 channel amplifier, it doesn't power on, stuck in protect. All psu fets are not shorted. it has 2 ics, not sure how I can test or identify these. one of the ic's has a discoloration.
I have this 5 channel amplifier, it doesn't power on, stuck in protect. All psu fets are not shorted. it has 2 ics, not sure how I can test or identify these. one of the ic's has a discoloration.
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It looks like there may have been some contamination on one IC. If something burns, it's generally a black that's produced.
These are likely TDA8954 ICs (attached). If so, you can start by testing for shorts between the center legs of each of the rectifiers (assuming that the rectifiers aren't doublers) and each of the speaker terminals.
These are likely TDA8954 ICs (attached). If so, you can start by testing for shorts between the center legs of each of the rectifiers (assuming that the rectifiers aren't doublers) and each of the speaker terminals.
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Those 2 ICs are for your output. they could be either TDA8954 OR TDA8920. Clean up the silicone grease and you will be able to the correct number.
Cleaned up the grease, no markings on it
It looks like there may have been some contamination on one IC. If something burns, it's generally a black that's produced.
These are likely TDA8954 ICs (attached). If so, you can start by testing for shorts between the center legs of each of the rectifiers (assuming that the rectifiers aren't doublers) and each of the speaker terminals.
I tested between the centre legs of the rectifiers and speaker terminals, there are no shorts
All rail voltages are present.
resistance between B+ to secondary ground is 2 mega ohm
I removed the ics (TDF8591TH) and the amp powers on. There seems to be some caps that are out of tolerance in below circuit.
C13A, C14A, C15A, C16A are meant to be 100nf or 20nf?
resistance between B+ to secondary ground is 2 mega ohm
I removed the ics (TDF8591TH) and the amp powers on. There seems to be some caps that are out of tolerance in below circuit.
C13A, C14A, C15A, C16A are meant to be 100nf or 20nf?
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