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Mtx ta92001 distorted output.
Mtx ta92001 distorted output.
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Old 14th March 2019, 12:52 AM   #21
kfx5050 is offline kfx5050  United States
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That Tl49c if apply pressure to the corner of that chip the buzzing noise goes away on the inductors and the DC voltage on the speaker output start to go away
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Old 16th March 2019, 01:26 AM   #22
kfx5050 is offline kfx5050  United States
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Ok replace tl494c pwm controller. inductors are not buzzing anymore but still not getting the two LEDs by the RCA inputs to light up and still have 24 volt DC output on the speaker terminal. Got my oscilloscope in now. ready for some real testing
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Old 16th March 2019, 01:31 AM   #23
kfx5050 is offline kfx5050  United States
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When I connect sub to the speaker terminals amp shuts down
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Old 17th March 2019, 11:04 PM   #24
kfx5050 is offline kfx5050  United States
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I have the scope in now. Can. Someone till me what I'm looking for?
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Old 18th March 2019, 01:29 AM   #25
kfx5050 is offline kfx5050  United States
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Does anybody know where the driver ic are at?
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Old 18th March 2019, 02:14 AM   #26
Perry Babin is offline Perry Babin  United States
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There is no 'driver' IC for the output.

I was waiting for the other IC voltage to be posted.
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Old 18th March 2019, 10:51 AM   #27
kfx5050 is offline kfx5050  United States
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Pin 1 0.009
2 05.005
3 0.003
4 -15.00
5 0.002
6 0.001
8 14.9
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Old 18th March 2019, 01:46 PM   #28
Perry Babin is offline Perry Babin  United States
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This is only 7 terminals and I don't know which IC is which but these are far different from the other set before changing the ICs.

Looking at the positive speaker terminal, what is the DC voltage on that terminal before and after LED 400 switches on?
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Old 18th March 2019, 10:59 PM   #29
kfx5050 is offline kfx5050  United States
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Before amp turn on it's showed 18 volts and decreases with the remote wire not connected. Once amp turns on it goes to 23 volts DC.
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Old 18th March 2019, 11:12 PM   #30
kfx5050 is offline kfx5050  United States
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Here's the readings it power on then With it powerd off.
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File Type: jpg DSC_0983.jpg (844.2 KB, 21 views)
File Type: jpg DSC_0979.jpg (568.4 KB, 21 views)
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