amp repair

I get 0.713 one way, reverse the leads and i get 1.465.

Both are about the same.

I know normally that would mean the diode has failed, but i dont know with zeners

The reading starts lower, and climbs up to the said values where it settles.

They are not shorted.  Did you use a real camera or was it a phone?  If it was a camera, set it to the Macro Focus mode and take a closer picture of the resistors that burnt.  The Macro Focus mode will have a green flower symbol.  This allows your camera to focus much better when taking close up pictures.

Also follow the traces from the burnt resistor to the next components each direction.  What component is next in line?

yes it was a digital camera used, its just that when the pictures are hosted and put up on this board they are resized and loose all there quality. Can i send them to you via e-mail?

I'll check the adjacent components and report back.

Thank you.

The only burnt resistor I see is the one near the zener diodes.  Have you checked the output transistors to see if any are shorted.  You DO NOT HAVE TO REMOVE THEM to check them.  If you turned the blue and white adjustments in the amp, turn them both fully counterclockwise.  If you have not adjusted them, DO NOT ADJUST them.  What is the number off of the actual transistor that has the burnt resistors are near?

That burnt resistor isn't actually blown though, its supposed to be a 100 ohm resistor and its reading 97.3 ohms. none of the output transistors read shorted across any 2 of their 3 legs and I havent turned the trim pots.

You mean the output transistors? they are IRF540's

Should all 3 of the op-amps (at the rca plug end)  read the same resistance across thier respective legs? its just the 1 near the gain and bass boost pots is giving different readings compaired to the other 2, which give the same readings. They are all the same part number!

Do you know what the one near the gain pot does? or how to test it?

Thanks for your help, its much appreciated.

None of the output transistors read shorted.

When i connect  my 12v source to the amp, after a few seconds, when this clicking sound starts, it drops down to 10v, like its sucking far too much current. Any thoughts on this? 

Cheers.

for the 4 transistors i get:

0.555   0.552   0.557   0.553

0.843   0.810   0.843   0.811