Question about AudioBahn A8002T Car Audio Amplifier

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Need parts for audiobahn A800T

I need to know the name of the part and where i can get replacements that connects the circuit board to the heatsink on my audio A800T amp. i have heard them called thermals.

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  • tim Feb 07, 2009

    Fqp50n06 are the only #s i see, And you can see they are physically damaged and fried. But I will try to get you some pics. Thanks for your time!

  • tim Apr 07, 2009

    i have replaced the transisters , the smaller ones connected to the heat sink , and now the opposite side of the board /the transisters on that side get really hot up to 110 degrees.what transisters should i use to replace the 50N06's if i cant find those exact ones ?

  • tim Apr 07, 2009

    It is the A8002T

  • tim Apr 10, 2009

    pbabin you have been agreat help i thank you for your time and patience. i am obviously a rookie ,but i really want to learn more. i am kinda on my own and struggling with this stuff. could you please tell me how to check with multimeter , if transisters are bad while in the circuit board , what readings should i get if good or bad . i was told to set the meter to continuity , is that correct. Again thank you for your time.

  • tim Apr 10, 2009

    pbabin you have been agreat help i thank you for your time and patience. i am obviously a rookie ,but i really want to learn more. i am kinda on my own and struggling with this stuff. could you please tell me how to check with multimeter , if transisters are bad while in the circuit board , what readings should i get if good or bad . i was told to set the meter to continuity , is that correct. Again thank you for your time.

  • tim Apr 12, 2009

    Wanted to send a heartfelt thanks, that link sure was a godsend . been pulling my hair out . thank you again. Tim

  • Perry Babin May 11, 2010

    I'm willing to help but you need to read the page link in the last reply. It tells you what you need to know and has links to pages that provide more information. You need to be familiar with the basics before we can procede.

  • Perry Babin May 11, 2010

    Try reading through THIS page. It should help you understand the basics and should save some time.

    When you check the transistors, you do NOT want to find anything near 0 ohms (or 0v if using diode check mode) when you place the meter's probes across the legs of any individual transistor.

  • Perry Babin May 11, 2010

    Why not order the 512-FQP50N06 from Mouser?

    What are the part numbers on the parts that are getting hot?

  • Perry Babin May 11, 2010

    Why not order the 512-FQP50N06 from Mouser?

    Is this an A800T or an A8000T?

    What are the part numbers on the parts that are getting hot?

  • Perry Babin May 11, 2010


    You also need to check the output transistors and the power supply driver transistors. The driver transistors are probably labeled Qp1/Qp2.

    The output transistors are the larger transistors clamped to the heatsink. You should not read anything near 0 ohms between the legs of any individual transistor. If you do, it's probably defective.

  • Perry Babin May 11, 2010

    The thermals rarely fail. You're probably referring to the power supply FETs. What are the numbers on the face of the parts?

    Can you send me a photo of the failed part?



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Ebay is a good place to start

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Have a toshiba model cn35d90 and took a power hit now sometimes color is off might go all blue/green or all yellow most of time its fine

Base on the info you've given us, I'd first suspect bad connections that change the circuit characteristics. Resolder any connections that look grainy or have rings. Pay particular attention to the connections on the back of the CRT.
Let us know if you need further assistance.

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MC2100 control board won't power on. Is it possible to test this board?

the regular complaint comes in treadmill motor controlling card is igbt fault. igbt will be fitted on the heatsink replace the same. also check the related driver transistors in its gate rail. instead of motor u can connect a bulb for testing board. u need the controlling circuit also to test the motor controlling card. because motor on ,off, speed controls commads are cumming from control circuit.

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Dear sir i have samsung 21 inch flat television now horizontal drive transistor fails after few hours i replaced 3 times the same transistor(tt2222) but again geting fails so pls let me know what is...

You just replace the freewheeling capacitor, normally come up to a value of 5600pf 2000V or so, connected to the collector of the horizontal output transistor, fitted very close to the collector lead. Replace the yoke return capacitor, 0.33uf or so also. Usually samsung sets use no heatsink for the horizontal output transistor. You just put a small heatsink to it and check. If it doesn't overheat, you can remove it later.
You can suspect the deflection yoke also for shorted winding. To check this. pull out the CRT base board out of the neck of the picture tube, place it where it doesn't get short circuited, and unplug the deflection yoke connection from the main board, and switch on the set. See whether the transistor overheats now. If it doesn't overheat, suspect the deflection yoke for shorted turns of winding inside it. Till the transistor overheats, suspect the LOT.
NOTE: Never switch on the set while unpluging the deflection yoke connection plug from the circuit board, without dismandling the CRT base board. CRT may get damaged, with a black burned spot inside the center of the screen.

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1 Answer

Toshiba satellite p105-s6104 overheated cause the fan wasn't working at one point and now the screen rarely turns on when powered up, and when it does only lasts several minutes. the fan works now but i...

Thermal Paste.

The top of a Processor's case, and the bottom of a Heatsink are not perfectly smooth. A microscopic view would reveal, 'Hills, Valleys, and Pits'.
These imperfections create a void when the two surfaces meet, and Air pockets are created.

Air is an Insulator, Not a Conductor.

Thermal Paste is a Conductor. It helps to conduct heat from the top of the Processor, to the bottom of the Heatsink. It also fills those voids.

[ Typical construction of a Heatsink, is a plate of metal with tall, thin fins protruding from it.
The plate of metal is placed against whatever object needs to have heat transferred away,
(Processor in this case), and the tall, thin fins absorb the heat from the plate.

The tall, thin fins then radiate the heat away.
If a fan is used along with the Heatsink, the air flow helps carry heat away from the fins ]

The Satellite P100 series of laptops, (Includes the P105-s6104), have to be disassembled down to the motherboard, in order to access the cooling assembly.

In the Satellite P100 series of laptops, the Heatsink is usually attached to a Cooling Tube. The Cooling Tube attached to flat plates that sit on top of the Processor, and on top of the VGA chipset.

The Cooling Fan sits on top of the Heatsink.

Toshiba Satellite P105 Disassembly Guide,


This is Page 1. The pages can be accessed by clicking on Page 1 :: Page2 :: Page 3 :: Find another model,
at the bottom of the page.

Page 3,

Click on the photos in Step 17, 18, and 19, (One at a time), to view the Cooling Assembly I'm referring to.

Observe the photo in Step 19. Enlarge it.
See the curved copper Cooling Tube, and the brass heatsink plate it attaches to?
There is a number 3, and 2 on the plate.
To the right of the number 2 is the Processor.

The Satellite P105-s6104 uses an Intel Core2 Duo T5200 processor.
(Mobile processor.
Merom Core.
1.6GHz maximum frequency rate
533MHz FSB
2MB of L2 cache
Uses a Socket M processor socket)

This is a close-up view,

In the heading where it states Specifications - Pictures (2) - Benchmarks - CPU ID (2) - Comments (0),
click on Pictures (2)
Now click on the photo under the heading Top View.

The square outside greenish part is a Circuit Board. (PCB or Printed Circuit Board) The dark rectangle in the center is the actual Processor. The Processor chipset. The circuit board has connections from the Processor chipset to the connecting pin on the bottom.

The dark rectangular shape is what is cleaned off, and fresh new thermal paste is applied.
I use Isopropyl Alcohol, (Rubbing alcohol), and Q-tips to clean. 91 percent alcohol is best.

[CAUTION!! Isopropyl Alcohol is EXTREMELY FLAMMABLE! Use in a well ventilated area, with NO sparks, or flames present! }

Apply a small pea sized drop of thermal paste on the center of the Processor chipset. Then the Cooling Assembly is reinstalled.
In the photo in Step 19, the VGA chipset is below the Processor.
It should also be cleaned, and new fresh thermal paste applied.
(Average cost of thermal paste is around $6)

The VGA chipset's circuit board is soldered to the motherboard. It isn't removable like the Processor.
Overheating may cause the solder joints to loosen enough, that the circuit board connections, (BGA), may come loose. This causes the VGA chipset to slightly lift up out of the motherboard connections. This can cause graphics problems. A special method is used to remelt the solder connections of the BGA, and the circuit board is put back in place. (Reflow)

Hopefully cleaning, and applying fresh new thermal paste to the Processor, and VGA chipset will solve your problem. Reflowing is usually done by the factory, although there are repair shops with the expertise, and correct machines. (Ka-Ching!) Most computer repair shops do not have the correct machines, nor the expertise.

All power removed from the laptop. AC adapter (Charger), and Battery.
Use an ESD wrist strap, connect the alligator clip to a good ground source. (Average cost is $3 to $8)
Use a multi-compartment container for the various screws you will remove, label the compartments for where the screws came out of.
There may be as a many as 60 screws, and 12 different types. Do NOT mix them up.
(You can use a clean egg container in a pinch. Label each egg holder)

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1 Answer

Sound but no picture on 65 inch toshiba projection then red light flashes with no sound at all

Hi my name is Roety,
I hope I can help you with your issue ,
 Most likely problem is bad convergence ICs and a blown pico fuse.

If you would prefer a repairman fix the set the ICs can be replaced for between $300 and $400
Most PTVs (projection TVs) have two convergence ICs on a specific circuit board. Taking it apart will require philips,torx and or 1/4" bits and involves unplugging cables that should may be marked with two letters each for easy reinstallation
I will not go into detail about how to take the circuit board out, but know this there are screws holding it down after removing the back disconnecting and all connectors. The ICs are clipped or screwed to a large heatsink.
When replacing the ICs make sure there is some heatsink compound on the metal to metal surfaces. also look carefully at the resistors near the ICs, replace any that look burnt (discolored) and do not measure the same ohms as is written on them. (in color code)
The two ICs are usually part # STK392-110s and the sell online for around $30-$45 each or there is a kit part # X480293 for $30
after replacing the ICs adjustment needed can usually be done in the customer menu , save the adjustment when done.
If any colors do not move at all, or enough after replacing the ICs there may still be an open fuse or burnt resistor that was overlooked. Voltage and resistance checks can locate the defective part.
There is also a service menu for fine and green convergence adjustments. every make/model has a different method for entering the service menu.
If I have helped you with your issue please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap

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1 Answer


It would definitely be worth your while to buy the correct cable, try Audiobahn's website for accessories.

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If flexing the board will "fix" the problem, then the most likely issue is poor solder connections on that board. Look for any connections that appear grainy or have rings and resolder them. The IC involved here is the vertical IC which will be a small flat IC attached to a heatsink. It may be marked LA7837 or something similar and have about 9-11 pins.

Try the resoldering and update this with your results.


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1 Answer

No sound

I have ran into this symptom on that set. What I found after hours of troubleshooting was that on the bottom of the circuit board that connects to the speakers inside of the set, there is a heat transfer putty that actually melted allowing the audio heatsink to touch the bottom of the circuit board. There were burn marks where the piece of metal heatsink had arced across. The disassembly/reassembly process was the hardest part of this repair because of the amount of screws and the way the boards were mounted on top of each other in close proximity. If you attempt this yourself look for a small 10 ohm surface mount resistor to open on bottom of board or any other charred component. Then discard or resecure heatsink that cuased problem. Either will work. Good luck, Russmann.

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Amp a2801q

Audiobahn A2801Q
Product Description:
Class A/B MOSFET Circuitry
200 watts x 2 @ 4 ohms stereo
280 watts x 2 @ 2 ohms stereo
560 watts x 1 @ 4 ohms mono

Volt Meter With Blue Illumination
PWM MOSFET Power Supply
Double Sided Glass Epoxy Circuit Board
THD: 0.02%
S/N Ratio: >100dB
Frequency Response: 10Hz - 40KHz (+/- 1dB)
Variable 18dB Hi-pass Crossover: 90Hz - 750Hz
Variable 18dB Low-pass Crossover: 30Hz To 120Hz
Bass boost @ 45Hz: 0/18dB
Subsonic Filter: 20Hz to 50Hz
RCA Throughput Connections
3-way Protection Circuitry: Thermal, Short Circuit and Overload
Cooling Fan
Cobalt Blue Illumination
High gloss Chrome Plated Finish
Nickel Plated Block Terminals
Dimensions: 2"(H) x 12.75"(W) x 15.5(D)
1-year warranty

Jan 02, 2008 | AudioBahn A2801Q Car Audio Amplifier

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