Here's a quick fix for a Galaxy DX66V that had the counter display go dark. What failed was the dimmer circuit on the small pcb plastered to the rear of the S-meter. The customer didn't care about the dimmer knob, and this trick made it unnecessary to mess with the failed dimmer transistor.
The connector CN2 at the top of the pic has the plug pulled. The connector to the left has two pins, with a shielded wire that picks up the PLL's VCO output. To its right, CN2 has a black wire at CN2's far left pin. Next to that is a brown wire. The brown wire leads over to the dimmer circuit on the S-meter circuit board. The brown wire gets clipped with enough length to reach inside the counter module.
The brown wire needs to have about 5 Volts DC fed to it from the dimmer board for normal brightness. The 5-Volt regulator chip inside the counter module is a handy source for this.
Didn't think to snap a pic of CN2 with the plug in place, but you should be able to find the correct brown wire without a pic, right?
Odds are that replacing the 2SC945 dimmer transistor would have fixed this. For a while. This way there's no dimmer transistor to overheat and fail again.
This will also apply to other models with the same small tin-can counter display module.
73
The connector CN2 at the top of the pic has the plug pulled. The connector to the left has two pins, with a shielded wire that picks up the PLL's VCO output. To its right, CN2 has a black wire at CN2's far left pin. Next to that is a brown wire. The brown wire leads over to the dimmer circuit on the S-meter circuit board. The brown wire gets clipped with enough length to reach inside the counter module.
The brown wire needs to have about 5 Volts DC fed to it from the dimmer board for normal brightness. The 5-Volt regulator chip inside the counter module is a handy source for this.
Didn't think to snap a pic of CN2 with the plug in place, but you should be able to find the correct brown wire without a pic, right?
Odds are that replacing the 2SC945 dimmer transistor would have fixed this. For a while. This way there's no dimmer transistor to overheat and fail again.
This will also apply to other models with the same small tin-can counter display module.
73
