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Old 21st December 2012, 09:06 AM   #1
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Default Hifonics audio driver board

What are the most common failures on this audio board?

With this removed the amp stays out of protect, something on here smoked but dont see anything burned.

AG QK
DK QN

What are these transistors?
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Old 21st December 2012, 09:22 AM   #2
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Q7, 11, 19 and 22 commonly fail on these boards.

AG and DK are the markings for the part number. I've never seen these fail.
2SA1797 and 2SC4672
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Old 21st December 2012, 09:31 AM   #3
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Quote:
Originally Posted by Perry Babin View Post
Q7, 11, 19 and 22 commonly fail on these boards.

AG and DK are the markings for the part number. I've never seen these fail.
2SA1797 and 2SC4672
Could Q7,11,19,22 being shorted cause outputs to fail?

Could Q18 and Q14 being shorted cause outputs to fail?
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Old 21st December 2012, 11:09 AM   #4
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Q7... generally cause the amp to go into protect mode.

Were Q18 and Q14 shorted?
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Old 21st December 2012, 05:25 PM   #5
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Q7 had a burn spot on it, Q14 had a burn spot on it, so I replaced Q7, Q11, Q19, Q22, Q18, Q14.

When I installed the driver board and powered the amp Q5, Q6, Q9, Q12 all went up in smoke.

From left to right, under Q12 pin 1 on the driver board was broken and I did not catch it. Maybe this is why The drivers went poof?

Now I have to order parts from Mouser.

I dont understand. I am replacing all the 640 n's while I am waiting for parts.

I am hoping the driver board has caused the issues in this amp.
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Old 22nd December 2012, 03:25 AM   #6
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I would suspect that they were damaged when the outputs failed or there was a solder bridge between solder pads either at the driver board or at the outputs (less likely).

Check for solder bridges on the plastic header for the driver board (between the plastic and the main board).
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Old 22nd December 2012, 04:19 AM   #7
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Look at the pic in post #1, see the broken leg all the way to the left? Could this have caused them to smoke?
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Old 22nd December 2012, 04:42 AM   #8
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That's the connection to the positive rail. I don't think that it could have caused the driver failure but I can't say that it absolutely could not have caused their failure.
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Old 23rd December 2012, 02:08 AM   #9
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OK my parts from Mouser will be here Monday or Wednesday. I will get all the drivers replaced when parts arrive, is there anything I should check now that those 4 drivers have fried?
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Old 23rd December 2012, 02:26 PM   #10
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Confirm that all of the regulators are working properly.
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