to erase/reset the eeprom you solder 2 longish wires onto pins 5 and 6 of the eeprom. join the wires re assemble power up the set ( switch on ) although the set won't actually turn on ! switch off and disconnect power remove wires and re assemble . start as usual . its actually quite straight forward dave . I've done it a few times and most times its helped when its been weird faults.