ON-Topic! If there was ever an analysis of those 94 PCM fails, I still say it will come down to poorly spec'd back-EMF protection
You realize that tip works on non-brick PSUs also, right?
I'll add that you want low-ESR caps in virtually all switch mode power supplies, since it's the Equivalent Series Resistance (ESR) that causes the heating that causes the boiling of the electrolyte which causes the doming which shows that they're dying. If you catch it before they vent. Afterward they vent - well, have you ever had to clean up under a car battery that sprung a leak?
The OTHER thing is to check all the resistors - a lot of designers don't derate power on resistors properly, so you'll find charred / overheated resistors that are now out of spec (if you can even READ the color bands - I've seen some that were so far overheated, it was a solid brown ... ).
Then check all solder joints.
THEN do the "throw it away"
yes I went down to my convenient surplus elctronic store and picked a couple caps out of a freakin bin. cost about 75 cents. sorry.. they didnt have the ESR ratings on the bin labels
Not about to wade through digi-key for something like that.
Geez, Ralph I didnt want it to turn into an essay.. maybe we should write a diy help for non-automotive money savers.
- sidenote: Brother called a couple weeks ago and said his 5 yo Frig quit. I got up there and saw he had the cover off the micro controller. I eyeballed it and found the board mounted fuse checked it and it was good.
"Yep it's probably broke"
From that point the discussion was HOW to replace the board. I was looking right at the switcher section and didnt even think to look.
Long story short, check internet: Exact symptoms- fail very common and 450 pieces in stock in the local appliance supply dist. Cost $275
Can only be that cheap by very high volume. Seriously, a quality looking board.
Well bro and wife were happy but something nagged at me. That cap thing above.
He doesnt keep stuff that fails around.
Good thing.. I'm afraid I would find a bad $2.50 cap and be a little sick.
You guys with the neat 2 door, and bottom freezer drawer frig's might want to bear that in mind.... at about 3-6 years.
And yes.. I also troubleshoot flaky control boards by poking gently with a non-conductive stick. Bad solder joints at connectors very common on furnace controllers. Fixed one for other brother about a month ago.
I learn more about cars every day!
I do it just because I still want to know HOW and WHY!!! Quit learning=die. Be informed as to WHAT, rather than learn,=brain-dead already.
1993 Silver LX 3.8L My Bravadiva's 'go store-fetch me parts' girl