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You need to signal test this board to confirm if the analogue preamp IC or any logic gate has failed. Otherwise the only option is to replace the board. check using a signal tester and signal analyser or if one channel is working it can be compared. Other wise it is best to take opinion and support
junn561, Thank you for asking me directly to help you with your problem. However, either the question you are asking is not within my area of expertise (I am an automotive repair technician), or the question is incomplete and does not contain enough information for me to help you.
This can be due to either a RUNAWAY of some power circuit or there is a dry point of soldering which seems to get aggravated when the board is working or heating.
So when the fault occurs check the power to the amplifier, the output stages. If a tap bring about life then the case of the dry soldering is justified.
If not this can be due to power failure due to semiconductor failure. A tracing with voltage/current/signal will be needed to confirm . USe a multimeter to check the voltage line , check the secondary to the circuits, specially the outputs.
Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.