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Old Gemini Controller Motherboard

 

Looking for some pointers on how to go about fixing my G11 Gemini 1 Controller with RJ cables and not round connectors.
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I have been using this mount for almost forever though considered myself as second owner for over 12 years. The controller hasn¡¯t been perfect for past one year or so with CMOS battery. Every time I put a new battery it will stop booting so for some time now I have been using my laptop to load location and other settings via serial port and recently that also stopped working.
Upon inspection discovered a dead spider inside and a burnt resistor. Question is if the old motherboard is salvageable and who can fix or shall I start look for an upgrade?
Any suggestions will be appreciated. Thank you, Ansuman.
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Edited

Hi Ansuman

there are 3 repairers:
Michael Herman in USA;
David Partridge n UK; and me?
Brendan in Australia

There maybe others but it¡¯s known these have parts resources knowledge etc for all PCB repairs. Contact by posts or messages?

The RJ connector PCBs are still good units. ?Some required a mod to extend battery life. ?I assume battery is ok is just it won¡¯t boot! ?Another common issue is the fuse F2 on units which the RJ PCB doesn¡¯t have...it tends to burn out small diodes instead.?

Thus if it¡¯s not booting does the system display any beeps codes dots on handset or does the handset led (below the buttons) come on?

Can you post a picture of the resistor!
--
Brendan
 

Currently it boots if no battery for CMOS is present
 
Edited

Yes they are dual Schottky diodes used to steer 5V around the PCB. ?Divides up pwr to CPU, HC, other ICs and motor encoder systems. Seen this type (actual) of fail before. ?But usually one fails not both.?

Im not at home atm but they can be replaced. ? Also need to check the buck converter and other system ICs post repair. ?It¡¯s possible it¡¯s a surge as a fail like this concerns many ICs....they cannot all be bad. It¡¯ll need a little work to clean up burns and some PCB holes around there are thru hole but. ¡°yes¡± it can be repaired.?

Edit:

just saw what looks like burn marks on the buck converter IC. ?HMMMM look if that¡¯s blown yes it can be replaced and I have spare ICs but there is a possibility of it causing a surge damaging many 5V ICs. ?

I have a spare PCB of that type that¡¯s good working condition and tested ok. ?However either of the repairers can probably do it. ? They also need to check your motors (encoder) and HC....

--
Brendan
 

If you want to try repair it yourself I can help with parts ident and basic cct descriptions.?
--
Brendan

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