Satan's Hollow SMOKING!!!!! HELP!

rainman154

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Is it really possessed????

J1 Pin 18 on the CPU board is smoking. The connector reads 12V. Any ideas??
 

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Yeah... you have a short somewhere. It's drawing too much current from the power supply through that coil and it smoked the coil.

Use a continuity test function on your digital multimeter and try to find the short.

Even better... if you have an ESR meter you can use it to find the short. All they are in effect are high frequency milli-ohmmeters. Mine goes down to .01 ohm and if you use it to find the short just look for the place where there's the lowest resistance reading and you'll find that shortest path to ground through the bad component. :)

RJ
 
I have seen this happen several times. That pin feeds the 12V to the top board Super Sound IO. One of those little black capacitors is probably shorted.

I don't have an ESR meter, so I resorted to pulling up one leg of them until I found the shorted one.

Buy a bunch of replacements and replace them all- you may avoid the same problem down the road.

K
 
Can anyone locate an actual schematic of that SUPER CPU pcb showing those components that burned? I'm curious what they are and what they are doing with the 12V.

Looks like a pair of zener diodes and a resistor, sort of... right?
If not, what?
 
Can anyone locate an actual schematic of that SUPER CPU pcb showing those components that burned? I'm curious what they are and what they are doing with the 12V.

Looks like a pair of zener diodes and a resistor, sort of... right?
If not, what?

The larger green thing that burnt up is an inductor.
http://www.mouser.com/ProductDetail/Vishay/IR04EB100K/?qs=tckYUfRMGW4JRqQTGPDQrA==

The other two things are ceramic capacitors. They'll be fine. They are covered in soot from the burning inductor. That'll clean right off.

Edward
 
The larger green thing that burnt up is an inductor.
http://www.mouser.com/ProductDetail/Vishay/IR04EB100K/?qs=tckYUfRMGW4JRqQTGPDQrA==

The other two things are ceramic capacitors. They'll be fine. They are covered in soot from the burning inductor. That'll clean right off.

Edward

Yep... you're right. I looked closer and I could see an "L..." stenciled under the component... the others have a 'C.." designator.

That said... the inductor itself isn't likely to have failed.. it's a passive component, right?
So, if that's true, it's something downstream that caused it.
Is there a schematic for this PCB so that I can trace the circuit (I don't want to follow the runs on the PCB)?
I have googled a bit and looked at a few MCR pdfs but not found it yet.
 

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The short circuit has drawn too much current through that inductor. The inductor heated up and burned from the excessive amounts of power being pulled through it.

It's not an uncommon sight.
 
The short circuit has drawn too much current through that inductor. The inductor heated up and burned from the excessive amounts of power being pulled through it.

It's not an uncommon sight.

OK... I understand... but how can I find the short?
That's what I don't know. Schematics would help... right?
 
They can... but you can find it without them...

Look for components that have changed color or for spots on the board that have changed color from the heat.

You can also disconnect daughterboards to try and isolate it down to a specific board. Once you do that then check the bypass caps first... tantalum caps second. Try and use your ohmmeter to find the lowest resistance as that will help you narrow down where the short is.
 
The short circuit has drawn too much current through that inductor. The inductor heated up and burned from the excessive amounts of power being pulled through it.

It's not an uncommon sight.

Yep, also the windings don't breathe like an open conductor and are more succeptible to overheating and melting the enamel. I once roasted an extension cord on a spool that way. It was under rated loas, so it sould have been fine unspooled.
 
I've seen this on MCR board stacks where some one used metal stand offs instead of plastic ones. In some cases there are traces close enough to the stand off location that can short to GND. Dont recall if they were +12 or +5 traces though.

I've also seen this when the ribbon cables between the boards are installed off by one pin.
 
Follow up... finally got the Kick cocktail in the house to work on it and I got a chance to mess with Rick's Satan's Hollow PCBs. I had another stack but had no idea if any of the 3 PCBs were good in that one.

Since the inductor that was roasting was on the 12 V input I took a shot that it was something on the Super Sound IO PCB that was drawing all that current.I swapped in the SSIO PCB from my unknown set and what da ya know... no smoke. Game coins... game starts... video looks like crazy blurry, washed out ass so I swapped in the Video PCB from my untested set and bingo... a lovely, colorful, awesome sounding Satans Hollow.

Can't really play it because the Kick trackball activates the shield and you can't shoot but hey... I pronounce it "working". Time to take it back to Rick and play some games on it.
 
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