AMP not Powering On (56k Warning) - diyAudio
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Old 18th April 2012, 02:57 PM   #1
diyAudio Member
 
Join Date: Apr 2012
Question AMP not Powering On (56k Warning)

Hi Everyone!

History:

The install was done by me around 4 years ago. It was working fine for the next couple of years. At some point I gave the car to a relative.
When I got it back, the amp was no longer installed. It was disconnected. Even the fuses were gone.... hahaha. So I placed it back in the box and left it alone, and drove the car without audio.

This weekend I finally had some free time to hook it back up. Installed 3 new fuses and reattached all the wires but…

My amp doesn't work, it is dead

No LED lights on the amp but there is power. 14+ volts on the power line, 12+ volts on the remote/turn on wire, and good ground.

So I disconnected it and brought it into the house. I began reading up on some troubleshooting steps and tried the following below. This is what it looks like opened up on the solder side and front.
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Click the image to open in full size.
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Click the image to open in full size.
It seems the IC is KIA494AP. I am not sure what the numbers 716 means.
This is the data sheet for the IC KIA494AP datasheet pdf datenblatt - KEC(Korea Electronics) - BIPOLAR LINEAR INTEGRATED CIRCUIT (VOLTAGE-MODE PWM CONTROLLER IC) ::: ALLDATASHEET :::.
Click the image to open in full size.
Click the image to open in full size.

The mosfet is DFP50N06.
The data sheet DFP50N06 - N-Channel MOSFET - DnI datasheet pdf - datasheet.co.kr
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Click the image to open in full size.
My test power supply is a Corsair 750TX.

Some kinda of wire wrapped but it appears the glue rubbed off.
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The RCA side of the AMP.
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These are the Fuses I am using. Purchased from digikey.
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My Digital multimeter is DVM850BL. I set the dial to voltages - range 20.
http://www.vellemanusa.com/products/...=enu&id=350297
Click the image to open in full size.
So I hooked up the AMP to the PC power supply, and getting 12 volts on the power terminal. I then loop a wire to the remote/turn on terminal with 12 volts too. The ground terminal is connected to the PC power supply’s ground. Nothing else connected. No fuses, no RCAs connected, and no speakers.

The amp is still not turning on. No LED lights.

I checked the output voltages on the speaker terminals. Left side is .10 Volts and the right side is like 1.07 Volts.

I also checked the output voltages for each socket for the fuses. All of them are producing 10 volts. When I hook up a bulb to each one, it doesn’t light up.
Click the image to open in full size.
I then checked the mosfets on the power side. I placed the red probe on the middle leg, and placed the black probe on the first and last leg. Each one shows 12 volts I did the same for the next 11 mosfets. All of them are 12 volts. I then checked the resistors next to them. All of them show 12 volts.
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I am not sure how to troubleshoot the IC. Or the rectifiers.

I am stump, I have no idea why it is not powering on. Anyone with any suggestions?

Thanks!

Last edited by QikoCB7; 19th April 2012 at 03:55 AM.
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Old 18th April 2012, 03:20 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
For all DC voltage readings (unless otherwise instructed), place the black probe on the ground terminal of the amp.

Install the fuses.

What is the DC voltage on the three legs of the power supply FET? If they're all essentially the same, you only need to post the DC voltage on the three legs of one FET.
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Old 19th April 2012, 03:23 AM   #3
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Thanks Perry!

I set the DMM to DC voltage to 20V and placed the black probe on the chassis ground. There appears to be a wire label "CH GND" screwed to the chassis.

I measured the 12 mosfets on the powered side of the circuit board with the red probe.

Each leg displayed 0.00 volts.

Second time I set the DMM to DC voltage to 200m and measured the 12 mosfets again.

The First legs are 01.1mV
The Last Legs are 01.1mV
The Center Legs always seem to drop down to around 00.4mV

Last edited by QikoCB7; 19th April 2012 at 03:48 AM.
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Old 19th April 2012, 05:49 AM   #4
ivkata is offline ivkata  United States
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Join Date: Dec 2010
with a fuse installed and black probe on amp ground u must have 12v on middle leg of all power supply transistors .Once u confirm u have 12v on all check for voltage on leg 1 the one on the left side u must have ~5 volts if u have less the power supply is not starting .Also confirm that on pin 12 of the kia494 u have 12 volts .
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Old 19th April 2012, 07:26 AM   #5
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Join Date: Nov 2003
Location: Louisiana
The ground screw to the heatsink may be DC isolated. Use the ground terminal that is next to the B+ and remote terminals outside the amp.
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Old 19th April 2012, 01:21 PM   #6
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Thanks Guys!

I will use the ground terminal that is next to the B+ and report back
Here is an image of the incorrect ground I used too.
Click the image to open in full size.
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Old 20th April 2012, 12:05 AM   #7
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I set the DMM to DC voltage to 20V and placed the black probe on outside ground terminal.

Power Supply Mosfets:
All center legs are 12.35V
The rest of the legs are 0.00V
IC - KIA494AP:
Click the image to open in full size.

  1. 1.01V
  2. 6.67V
  3. .10V
  4. .29V
  5. 0.00V
  6. 0.00V
  7. 0.00V
  8. 0.10V
  9. 0.05V
  10. 0.00V
  11. 0.10V
  12. 11.68V
  13. 6.67V
  14. 6.67V
  15. 6.67V
  16. 2.24V
Rectifiers:
(I believe they are called that). They are the same measurements on the other side too.


Click the image to open in full size.

D11P1
  1. 8.65V
  2. 8.75V
  3. 8.63V
D12P1
  1. 8.65V
  2. 9.11V
  3. 8.63V
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Old 20th April 2012, 08:39 AM   #8
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Join Date: Nov 2003
Location: Louisiana
The 494 appears to have failed. There may be other problems also because you should have approximately 12v on pins 8 and 11.
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Old 20th April 2012, 01:32 PM   #9
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So I should trace PIN 11 backwards to the B+, and check the components for failure?

Thanks,
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Old 20th April 2012, 03:10 PM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It's probably a bad connection on one of the jumper wires.
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