1708 - looks like new, except B button dead

[theADDict]

Hey folks, great forum, wish I found it earlier.

Current controller, new problem never encountered before.

1708
mint condition so could of been faulty from new
everything works perfect, except B which is of course on bigger board....dead

swapped out rubber membrane...but looked new, and used one made no difference.

Any ideas how I can test, fix, diagnose how to get B button response ?

not very knowledgable, but have multimeter and soldering iron at the ready.
lots of spares too

many thanks u pros

[theADDict]

update, grabbed a split damaged donor board to compare with, spotted something quite quickly.....



R29 looks missing, or off its pads, or totally mangled.

what do you think ? bridge ? can I run a link wire elsewhere ? or try and clean then replace with donor cap from damaged board ??
or.....would that not be B button linked solution I was looking for ?

many thanks

[RDC]

R29 is a 100ohm, 0402 sized, SMT Resistor and is most likely the reason the B buttons is dead as it's in that line. You can jumper it for a test to see if B starts working, but I'd replace the Resistor for a permanent repair if it does work after that.

[theADDict]

Thanks for the reply.
Tried to clean the area...but was only one pad. Top one.
Tried to replace cap....not got the correct equipment really...or skills.....but then ran a wire from cap...or solder around cap?!...to TP41, so at least I could test.

result.....perfecto.
see how long she lasts.

thanks again, got another troublesome controller to post queries of when I have time.