IM HAVING ISSUES WITH MY AUDIO AMPLIFIER, TRANSISTORS HEAT UP WITH NO LOAD, WHAT COULD CAUSE THIS, ANY HELP IS APRECIATED, THANK YOU

 

Hello,

Post your schematic, sso we can see how things are done in your circuit.

Bertus

 

If the output bias current for a class AB is too high (for whatever reason), then the output transistors will overheat.

 

if the amp seems to work, check the bypass caps on the emitters of the output stage. if leaky or shorted that will mess up the bias and increase the current.

 

There may be an oscillation.
Do you have a voltmeter to connect to the speakers one channel at a time?
Check for DC AND AC voltage.
With the volume at minimum the meter should measure very close to zero volts.
Checking with a 'scope would be even better.

 

I allready replaced the bad caps, voltage is good on channel, i also replaced bad transistor fets, and they still heat up, i cant find a schematic for this amplifier but its a memphis 16 pb1kd

 

what else could cause this so i can keep checking them one by one. i appreciate all help.

 

Hello,

Did you check the gate resistors?
Have a look at this thread of DIY:
http://www.diyaudio.com/forums/car-audio/116434-quick-smd-resistor-questions.html

BTW your amplifier is 1000 W class D amplifier.
A class D amplifier should not get hot.
There could be something wrong in de fet driver circuit, but again without a schematic troubleshooting will be very difficult.

Bertus

 

You have to take some photos for different angels and attach them.

 

 

this is before i replaces the parts, the gate resistors are the big green ones? they should read .1 ohms, (black brown silver gold) some read 0.0 ohms, is this bad..... thank yall

 

Hello,

On that DIY forum they are talking about SMD resistors.
These are small black or gray looking rectangular blocks.

The wattage is generally determined by the size. Use dial calipers to measure the resistor. The most common sizes are 0805 (0.080" x 0.050") and 1206 (0.120" x 0.060").

Bertus

 

Is there a specific website where I can look up amplifier schematics, I can't seem to find any. Thanks for responding