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Old 23rd May 2012, 04:36 AM   #1
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Default mtx thunder 5601

so as the title says, i have a mtx thunder 5601 and it wont power on. it worked for about a week then just shut off, i know all the connections to the amp where good cuz i hooked up my backup amp and it worked with no problems.

all 3 25amp fuses checked good, i opened it up and didnt see anything that looked burnt. i had no thermal or short lights on.

just wondering what would be a good area of the amp to start my t/s with. im guessing some kind of power transformer/ transistor.
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Old 24th May 2012, 11:32 AM   #2
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Post a pic of the board and start checking the supply and output devices.
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Old 24th May 2012, 01:04 PM   #3
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Post the DC voltage on all pins of the IC indicated in the attached photo. Place the black probe on the ground terminal of the amplifier. The arrow is pointing to pin 1. Look at the other photo to see the numbering scheme. Copy and paste the following into your reply. Remove the fuses and insert a 10 amp fuse in place of one of the fuses. This will help protect the amp if you make a mistake. If you haven't done so already, read the basic amp repair page (link in sig line below).

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 25th May 2012, 01:51 AM   #4
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Quote:
Originally Posted by brandes.cm View Post
Post a pic of the board and start checking the supply and output devices.
Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.
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Old 25th May 2012, 11:09 PM   #5
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Pin 1: 2.4v
Pin 2: 2.4v
Pin 3: 3.4v
Pin 4: .82v
Pin 5: 1.5v
Pin 6: 3.3v
Pin 7: .7v
Pin 8: 12.18v
Pin 9: .7v
Pin 10: .5v
Pin 11: 12.39v
Pin 12: 13.12v
Pin 13: 4.95v
Pin 14: 4.95v
Pin 15: 4.9v
Pin 16:.5v
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Old 26th May 2012, 05:28 AM   #6
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The power supply appears to be operating. What is the DC voltage on pins 4 and 8 of the op-amp near the RCA jacks?
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Old 27th May 2012, 05:42 PM   #7
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Quote:
Originally Posted by Perry Babin View Post
The power supply appears to be operating. What is the DC voltage on pins 4 and 8 of the op-amp near the RCA jacks?
got any idea what c119 would effect, it fell off the board today and what would be a part number to replace it.

all i can see on the top is in the following order

10
25s
4cd
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Old 27th May 2012, 08:13 PM   #8
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Capacitors don't simply fall off of the board. Did it overheat and melt the solder or was it forcibly removed from the board?
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Old 28th May 2012, 12:07 AM   #9
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Quote:
Originally Posted by Perry Babin View Post
Capacitors don't simply fall off of the board. Did it overheat and melt the solder or was it forcibly removed from the board?
i was looking for the op-amp near the rca's and noticed it was loose so i grabbed it and it came off, i might have broke it, but i originally didn't apply any force to it.
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Old 28th May 2012, 12:43 AM   #10
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Location: Louisiana
10Uf, 25v

What is the DC voltage on pins 4 and 8 of the op-amp near the RCA jacks?
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