Punt for comments
I have recently been reincarnating my mp3 player after a 2 year hiatus, and instead of buying a new inverter I chose to go with the sproggy 2.8 PS.
I got the board, populated it as required and it nearly works. The symptoms I am seeing are as follows:-
The 5 volt regulator heat sink gets significantly hotter than the others. The drive doesn't go around (a single quantum big foot average draw 1A@12v 850mA @5v) I tried unplugging the MB to try and get it to spin, but nothing. Also, when the MB is plugged on (an430tx, 32Mb ram, 233 w/ MMX, yamaha onboard sound, NE2000, Aztech/packard bell radio, trident vga) the heat sink near the power connector gets hot. The mother board displays lights like it is in sleep mode. I have tried the motherboard with bare minimum too (just cpu and memory)
Prodding the psu reveals +12v=12v, -12v=-17v, +5v=4.6v-4.7v, -5v=not connected (I know why), 3.3v=3.3v. With evertyhing unplugged the PSU gives voltages in tolerances except for the -12v which is still giving about -17v.
The only thing I can think of is that the inductors I found (at a surplus store) won't carry the current on the 5v line, this is causing it to dip, inturn making the MB think it's in standby mode.
I am soliciting opinions, however please remember that buying a commercial offering however attractive is not an option for me.
Thanks for any and all help
Punt for comments
I would start by getting the system running indoors with a standard AC ATX PSU. Then move it to the car for testing with the sproggy.
If the HD doesn't spin, its either fryed or not getting 12V. I would try connecting ONLY the 12V rail to the HD. Disconnect the 5V pins. If it doesn't spin, you know there is something wrong with the 12V rail. Find the problem and then test the 5V. Again, make sure the drive works indoors with a standard AC ATX PSU.
Edit: I don't use a sproggy, but thats how I would try to isolate the problem. You should really consider an OPUS. It is well worth the investment. It's trouble free and has all the features you need for a car application.