Fuse blows Took to repair shop - they can find schematics for it. Where can they (we) find that?

Stop going to Firestone and take it to a shop that specializes in electrical repair. Firestone is a tire shop

1. Stop going to this shop.
A fuse that keeps blowing is a sign of a problem. You never replace a fuse with one of a higher amperage because the idea is the fuse is suppose to blow before the the wires melt and catch on fire. The reason it stopped working and the fuse didn't blow is probably be cause the wire did melt someplace and you are lucky the car didn't burn. If it did burn and the insurance company found the 40 amp fuse, they would probably have refused to pay.
The idea that a repair shop would do this tells me that they don't know what they are doing. Read this
FUSES

Any and all issues involving anything electrical,
require a partial or complete set of wiring
diagrams of your car.

Sort of a road map to follow, to find
the cause and fix

Without that, even a repair shop is wasting
their time

So you need a repair shop with a data base
& necessary schematics

Now if your working on it or a repair shop,
you will need a wiring diagram or waste
your time doing whatever.

Don't throw fuses at it

Walk down the system components
from the blown fuse,by reading the
schematic.

First - disconnect ALL wires.... Power, Ground, Remote, RCA, Speakers.

Reconnect only power, and ground, and remote wire - being extra careful there are no wire strands sticking out of the terminal.

Now power on the amplifier.
If the fuse on the amplifier blows - the problem is internal and should be repaired by an electrical repair shop familiar with Car Audio Amplifiers - as Audiobahn is no longer in business - repair schematics are hard to come acros, and parts must be sourced elsewhere.

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AUDIO OUTPUT TRANSISTOR OR IC IS SHORTED

Could be a broken ABS sensor ring at one of the wheels

there is a short somewhere in the wiring

Hi you will probably find it very difficult to get the parts for that make of telly did the repair shop look inside the telly or did they just turn you away when they see what make it was.
The problem your having could be one of a couple of things.
The first thing to check would be the internal fuse only check this if you have nothing at all coming on not even the standby light.
If the standby lights on then the fault would be in the high voltage part of the board.
I have looked everywhere for the schematics for your telly and have been unable to locate one on line.
The place to start looking for the problem if you are able to look yourself but only do this if you ahev some experiance in this kind of thing else you could damage the telly further.
If the fuse is blown you could change this first but if it is blown you need to find out what has caused it to blow.
You will probably find that it could be the power relay transformer that the power lead goes into inside the telly this is the most likely problem because if this was fine then you would at least have the standby light on as you dont then it probably is this.
It could even be a resistor or transistor around this part that has gone these will also need testing but without schematics you would be guessing so that would be the first thing to do is locate schematics i have looked and not found any yet but will keep looking for you will let you know.
As for parts if you can get the part number off the part thats gone then you might be able to source one using search engine but you will need to get the part number, this would be on schematics also.
If you arenot able to repair this yourself but can get the part number and source the parts yourself then repair shop should fit them for you.
Ill have another look now for schematics and also see if i can source any parts for your make and model ill get back to you soon ok

Try http://www.simplyspeakers.com. Good Luck