GM300 Power/display problem

[eagle844]

Hello,

I am experiencing an odd problem. My GM300 does not show the channel display and none of the button make any noise. There is not a beep when turning it on. The back light are lit. The radio seems dead. This happened once before. I put the radio on my self for parts and one day I powered up and it worked.

What would be the cause of this? Is there a way to fix. We looked for bad solder joints, eprom seating and board pins at both places had good connections.

I think the eprom crashed. Is there a "cmos" battery per se in there, like a computer? Seems like the radio cannot pass post?

Any help would be appreciated.

Thank you in advance,

Mike

[jackhackett]

No battery. The expanded logic board has an EPROM for the firmware and an EEPROM for the codeplug.