[Kenwood] TS-940 tx died all modes

[Javi]

My name is Javier  EA4AON from Madrid, I just read  your  fantastic web 
page, and need a few help for repair my ts-940. Last month i bought a 
MC-60 micro and was running very well during 30 minutes, more later the 
transmision died and when push the PTT only light tx led and no whatch  
spire moving of my modulation on the smitter, no rf power on the antenna 
output in all modes, but I can heard me on loud speaker  when push 
monitor button. I measured RF signal before PA unit and not find anything. 
I think  that micro had problem with 8 V voltage supply from micro plug 
on ts-940 ( I cut wire yellow inside micro box for the future and buy 
two batteries ).

Where can I have a look? Witch PCB are  involved?

Thank you for your help.

Thank you in advance, Javi (EA4AON).