Hi all,
I'm hoping you can help/offer some advice on a problem I am having. I have an old MK i AT Procat that has developed a fault. On researching the topic the fault seems quite common, however I have been unable to find a solution.
The fault lies with one of the motors (right hand side) running constantly at seemingly random times. The boat can function normally for extended periods, but will malfunction if the boat rocks or is knocked. Upon taking the boat apart the fault appear to occur if the the microchip touched (although this is not something that would happen when the boat is on the water). I have included an image that may help (not mine i must add). When the fault occurs the MOSFETs on the right hand side (labelled 2) start to overheat and smoke, also the non-latching relay (#3) is silent where as the non-latching relay (#4) clicks. it is always the right hand MOFSETs that overheat and these control the right hand motor. The LED's for the boat are also wired into the right hand side however these have also stopped working and never come on.
I have replaced the handset and crystal with no effect. I have limited knowledge of circuity but i really enjoy learning, if this is something that i might be able to fix I would really like to try.
I appreciate that this may be a lost cause but if anyone could help i would really appreciate it. I hope I have provided enough information to start a discussion.
Thanks in advance
Andy