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Trials & Tribulations of Chip Repairs & Upgrades

64815 Views 347 Replies 51 Participants Last post by  Ade
An F1 DPR chip arrived on my doorstep to be fixed. It looked perfectly OK but would not run when connected to a chassis and tested on a powerbase. After a check of the components, I found that three of the four diodes were not working at all so I replaced them with 1A Schottkys .........


All still looking OK ....... time to test my handy work .......


Reassembled back onto the testbed, I pulled the throttle back and woomph!
... very bright flames & tons of acrid smoke.

As you can see, the dual MOSFETs, top left, has decided to expire. It is a dual MOSFET bereft of any magical smoke, it is an ex-MOSFET.
I wonder if Farnell can help me out in the morning? ......
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I've done similar on a Pit-Pro that someone smoked, not on a chip though...
They have something called a wave solder machine, robotic placing of components and machine soldered.

Good job Bryan! Now you can tackle anything!
New PCB required...
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