There's a 'daughter board' mounted vertically on the mother board on the right end (when viewed from the front). Pull it out and clean the contacts on both the boards. Should rectify the problem. If not, check the power coming to the display circuitry/board.
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Hello Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service. Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display. Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.
It sounds like you are using an amplifier. Make sure you are using the blue/white wire to turn the amplifier on. The blue/white wire is amplifier remote turn on and the blue wire is power antenna remote turn on. The blue wire turns off when leaving tuner mode, turning the amplifier off.
Do you have the radio hooked up to an amplifier? If so, it sounds like you are using the blue wire (antenna remote turn on) instead of the blue/white wire (amplifier remote turn on) to turn the amp on. The antenna remote wire turns off when leaving tuner mode.
HI...CHECK TO SEE IF THE AMP IS GETTING POWER (REM) POWER-----(AMP)POWER--GROUND,, CHECK FUSES BOTH OF THEM--....YOU MAY HAVE DONE THIS ALREADY--CHECK TO SEE IF THE RADIO FUSE IS OK (POWER)..THE DISPLAY CAN STILL WORK FINE BECAUSE THE RADIO HAS 2 FUSES 1 FOR (POWER) AND ONE FOR MEMORY(DISPLAY)
HARD TO SAY WITH OUT LOOKING AT IT.... GOOD LUCK