Rockford T10001BD blown output fet - Page 5 - diyAudio
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Old 9th July 2011, 03:15 AM   #41
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they must be replaced if you do not know the test. you can already turn on the amp and see if one of the LM339 heating metant finger on it. If it heats must be changed
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Old 9th July 2011, 03:26 AM   #42
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Not since the LM339 has been removed if the amp will run out of information and could remain in protection
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Old 9th July 2011, 03:30 AM   #43
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they must be replaced if you do not know the test. you can already turn on the amp and see if one of the LM339 heating metant finger on it. If it heats must be changed
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Old 9th July 2011, 04:43 AM   #44
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ok the amp isn't going into protect; i think the led just stays that dim; idk.......

but the reason i say that it does NOT go into protect is because 3 of the 4 fet pairs get signal that corresponds with music going in. the 4th one does not. I know it is in H bridge (read up on class d amps earlier, these things are complicated!) so i guess 3 of the 4 are fine one has an issue.......... I did probe on the control chips and all 4 output pins are normal so the problem is between the output pin on the control chip and the FETs.

I get the following wave forms on the left most pin (looking at the face) of the different fet channels. I forgot to remember which one was which not that it matters. FYI the probe was in x10 mode and i did calibrate the pot with the calibrate pin on my scope

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Here is the one that is not right. I had to drop the voltage scale way down to even see anything.
Click the image to open in full size.
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Old 9th July 2011, 04:48 AM   #45
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Which FETs had the poor signal?

You need to be specific when referring to components. Use their circuit board designations. It reduces confusion significantly and saves time.

The amber LEDs do tend to stay lit slightly. When they're lit, they're really bright.
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Old 9th July 2011, 04:53 AM   #46
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on the left of the board ther are 4 output fets; the right two are the ones i'm referring to. all of these are output. power supply is fine so i wont refer to them. The pair that has no signal was one half of the blown up output FETs.

I dont know how to label them +/- low high. I haven't traced out what part of the h bridge that pair goes to.

I also just noticed that the first two pics are from the same pair of output fets. Two pairs go posative when they're signaling two go negative. Well one goes negative the other doesn't do anything. All readings were taken with the negative/ground on the scope to the negative battery terminal
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Old 9th July 2011, 05:34 AM   #47
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Circuit board designations are printed next to the components. This is explained (with photos) on the basic repair page.
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Old 9th July 2011, 05:45 AM   #48
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Oh my bad. Q208 and Q209, i shoulda known that. Its been a long day lol
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Old 9th July 2011, 06:09 AM   #49
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Try connecting leg 3 of Q208 or Q209 to the negative speaker terminal. Be careful because it may draw excessive current.

If it doesn't draw excessive current, re-check the signal on leg 1 of Q208 or Q209.
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Old 9th July 2011, 06:48 PM   #50
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connnect it even with no fets in q208 and q209?
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