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Yes, I agree there probably is a problem with the circuit board.
The unit must be removed and replaced in order to reliably fix this problem.
I don't know anyone who would fix indiividual components on the boards.
Try the dealership.
Unfortunately, the car is out of warranty and over 10 years old so some parts are no longer available.
Try a salvage yard for parts.
That's all I know.
If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core
dawg i had the same problem and there is no way out of this! Believe me i tried it and fired the dash board twice!! I had everything workin got my bangs on and boom like 3 min later it frys. Best bet...go and get the wiring harness. 100 bucks :( but its the only one for ALL Cadillacs! I didnt want to spend the money for it but its was better than frying the dash again and better than using the piece of **** stock radio :)
pull codes from on board diagnostics turn key on not running press and hold hot button on temp and off at same time till dash lights up write down codes respond with all computer codes i will help you determine prodlem and try to fix