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CDM 1550 backlight

jasonacg

Member
Joined
Dec 19, 2002
Messages
3
I have a CDM 1550 whose backlight and TX LED would work intermittently, and have since stopped working altogether. I swapped a known working control head and ribbon cable from another radio, and the problem remains. The original head also lights up when moved to another radio. I do have a brightness key programmed, and that doesn't help, either.

So, I'm convinced that the issue is within the body of the radio, but the fact that it's intermittent makes me doubt that it has anything to do with a fuse. If I get the urge to open this thing up, can someone point me to the area of the board that handles the lighting, and what to look for? Also, has anyone successfully fixed this issue on their own?

It's not by any means a life-or-death issue...but would be nice to have it working again.

Thanks.
 

jtsjc1

Member
Joined
Aug 21, 2005
Messages
16
Location
nj
I'm no expert but I believe the CPS can program the LED and backlight. My backlight is not programmed to go on when I receive but it does work. I guess when it was programmed it was not done correctly and I don't have the CPS to do it myself so I've learned to live with it.
 

K2NEC

Member
Joined
Oct 23, 2017
Messages
1,176
I'm no expert but I believe the CPS can program the LED and backlight. My backlight is not programmed to go on when I receive but it does work.
The display should always be on, it's a mobile
 

mmckenna

I ♥ Ø
Joined
Jul 27, 2005
Messages
13,494
Location
SNCZCA01DS0
There's a fuse on the FLT A+ line that may have opened. It's on the circuit board, as in it's a trace that opens. The manual recommends replacing it with a 0Ω resistor. From the manual (spelling mistake and all):

Note: Fuse is part of PCB
In case fuse is blowen, replace it with R0410 P/N 0662057B47

You can download the service manual here: The Motorola CDM Mobile Radio Index page
 

jtsjc1

Member
Joined
Aug 21, 2005
Messages
16
Location
nj
The display should always be on, it's a mobile
Thanks do you know how I can get the backlight to stay on? It goes on briefly when I power on but doesn't stay on. When I go into the menu and turn it on ,it will stay on for a short time but then goes out. If I go back in the light menu I can turn it on again no problem but it won't stay on. It also doesn't go on when I receive either. It is an HT1250 LS+.
 

K2NEC

Member
Joined
Oct 23, 2017
Messages
1,176
Thanks do you know how I can get the backlight to stay on? It goes on briefly when I power on but doesn't stay on. When I go into the menu and turn it on ,it will stay on for a short time but then goes out. If I go back in the light menu I can turn it on again no problem but it won't stay on. It also doesn't go on when I receive either. It is an HT1250 LS+.
What you should do is program a button for the light so you can press the button to turn on the display. There is no way to keep the display on all the time. It would drain your battery pretty quick if it was on all the time. The radio also won't light the display when you receive.
 

jtsjc1

Member
Joined
Aug 21, 2005
Messages
16
Location
nj
What you should do is program a button for the light so you can press the button to turn on the display. There is no way to keep the display on all the time. It would drain your battery pretty quick if it was on all the time. The radio also won't light the display when you receive.
Appreciate that thank you.
 
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