MSgpio.com read only forums (Jan.15,2018)

I think I'll ask my wife's prayer group to take up for the SMT processor on that board. Or cast the bones or something.

maybe I'll just go somewhere and shoot myself. Anybody reading carefully at all might have noticed I stated I was having trouble with the transistors I installed JP1, 2 , 3 and 4. Unfortunately, those transistors go in spots labelled Q9, 10, 11 and 12. Of course, all you heavily experienced guys ...

Well, I clipped off JP3, no difference. So then, in a fit of pique I clipped the other 3 off too. Yes, I graduated from the self-foot-shoot school of technology.

Anyway, now I have 5.001V on the 5V rail. !2V rail still at about 12.35.

Now, I checked the four JPx's and found all 4 to have 12V and ...

OK, I've replaced the regulator, still have 6.3V. That transistor in the GPO2 section at JP3 seems to be the leading suspect. it has legs on the 12V rail and 5V rail. I've looked at the schematic, it seems to match the physical layout OK. or vice-versa.

What would make it get so hot? Something ...

anybody home?

that's interesting, looks like the 12V and 5V sides of things meet at JP3, which is where the egg-frying transistor mounts. That's in GPO2 section. Looks like GPO2 goes AMP7 which goes to LED3 on the stim. IIRC I never did get those LEDs to work with the big pot for the gears.

I wonder if that ...

well, update. pulled the old regulator off, installed a new one from DIY AT. power up the board, still have 6.29 volts on the right-most Pin #3 on the regulator. IOW, no change.

So, it must have a short between the 5V rail and the 12V rail somehow. It was OK when I buttoned it up in the case, but I ...

Well, I bought a few of the 5V regulator from DIYAT. I guess I'll see when they get here.

yeah, I'm asking about the TCU, not the stim. I'm connecting the 12V battery to Pin1 of the connector. I'm using the pad marked as ground just to the right of Q8 for ground. I temporarily soldered a jumper wire on there. Seems to work, I think it's the same ground as the 4 pins 17-19.

Are those ...

well, I thought I had my TCU about done.

now checking it with a transtim I find that the 5V has somehow become 6.32V. It's hooked up to a 12V SLA battery that currently has about 12.5V. What could cause this? is the regulator toast? Previously it actually was showing 4.99V on my Fluke 175.

it ...