GD77 Not Powering On - Fixed

VK3KYY
Posts: 8193
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia

Re: GD77 Not Powering On - Fixed

Post by VK3KYY » Tue Jan 30, 2024 7:42 pm

W7OBB wrote:
Tue Jan 30, 2024 1:30 pm
Complete newb here so please forgive my dumb questions.

Is there a electrical/pcb diagram somewhere online to help me find components?
Unfortunately the manufacturers of these radios do not publish the schematic or parts list

W7OBB
Posts: 15
Joined: Tue Jan 04, 2022 7:24 pm

Re: GD77 Not Powering On - Fixed

Post by W7OBB » Thu May 23, 2024 3:48 pm

Bought a GD77 with the white screen issue. Radio was operational but no info on the screen, just white.

So I opened it up and attempted to reseat the display ribbon cable which is the common fault. In the process, the two wires connecting to the bottom of the speaker disconnected (they are very small/thin). So I resoldered them to the board and now the display wont come on at all.

I thought I might have reversed the wires so I tried the opposite way as well. Same result. Seems like something happened either when the wires disconnected and I turned on OR after i reconnected the two wires reversed and turned on.

Any ideas what to check?

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F1RMB
Posts: 2878
Joined: Sat Nov 16, 2019 5:42 am
Location: Grenoble, France

Re: GD77 Not Powering On - Fixed

Post by F1RMB » Thu May 23, 2024 3:58 pm

Did you reseated the flat flex (the white/blue one) on both side ?
Checked the flat flex continuity ?

Checked the LCD panel's flat flex connection (semi-transparent ribbon cable) ?

Maybe the LCD panel is defective.

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