Dirtbag not getting any power from Road Rage after boxing it.

[reaganomics!]

So, I built a MN3005 Dirtbag.  I used a T0-92 style 78L15 from Small Bear instead of the T0-220 7815 kind specified in the build report.  I also subbed 1n914s in for the two 1n5817s at d1 and d2.

I used an LT1054 and made sure that the first pin was not connected to the board. I was mindful of the recent finding that the 15v and 18v pads were switched on it, and wired it correctly.  When I had the dirtbag hooked up to the breakout box, powered by a one-spot, it worked perfectly and I was able to bias it as well as socket caps in the c41 spot.

A few days later I boxed it up and was getting no signal at all.  I got out my DMM and found out that the Road Rage board was getting around 9v in, but no voltage at all coming out. The Dirtbag board also registered no voltage. I also noticed that the 78L15 was very very hot, enough so that it hurt to touch it.

I figured that the 78L15 I gambled on was the problem and ordered the T0-220 7815CT regulators from Mouser.  For good measure I got a new LT1054 and put in the correct 1n5817s.  The problem is the same though.  Still no voltage coming out and the regulator is too hot to touch.

I have no idea why this would be happening when it worked fine pre-boxing.  The only constant on the road rage is the electro caps and the 1n4001 at D3.

[gtr2]

IC voltages?

[Scruffie]

Sounds like somethings shorting on the road rage, i'll admit, most times i've used a regultor they've overheated... correct pinout or not, type shouldn't matter too much... something is making it draw too much current or it's not doing its job.

What's the output of the LT1054? 18ish V? If so the 15V reg is at fault, wrong orientation or shorting somewhere.

[reaganomics!]

ok so I tried touching up all of the solder joints and trying to find a solder bridge to see if that made a difference.  It didn't so I measured the voltages of the ICs

IC1 (LT1054IP)
2- 5.63
3- 0.00
4- 3.98
5- 4.05
6- 2.10
7- 1.42
8- 9.50

IC2 (7815)
1- 0.00
2- 0.00
3- 8.76

I noticed afterwards that IC1 started to become unseated so I tried measuring again to see if that made a difference.  I was getting little or no voltage on any of the pins then there was a spark, poof of smoke, cracked LT1054

[gtr2]

Here is what they should be.  My input voltage is 8.8V, output 14.8V

IC (LT1054IP)
2- 4.75
3- 0.00
4- (-3.95)
5- (-8.63)
6- 2.5
7- 1.4
8- 8.8

IC2 (7815)
1- 17.03
2- 0.00
3- 14.8

Josh

[reaganomics!]

So, I noticed a mistake with the road rage board.  I realized that, for some reason, I had put D4 on the board, so I clipped it off and.... no change in the problem