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Old 04-27-2010, 04:28 PM   #1
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Default Heckfire, Huck! 30v's confounded my MS

So after having no voltage regulator via 01+ alternator I managed to send 30 volts thru my car. Causing this:

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Left a nice black spot to show me how bad I am. Burned and crack two transistors :(

Is this fixable? It seems to be but just want an experience eye to tell me yay or nay.
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Old 04-27-2010, 04:33 PM   #2
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Totally fixable. How easy it will be will depend on whether or not you killed any surface mount capacitors in the process.

Also -> Who has to thumbs and called that **** like a pro?
<--This guy .
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Old 04-27-2010, 04:34 PM   #3
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You don't need the one labeled MICA underneath it. But it's a tip125.

the 5V voltage regulator can be picked up at radio shack and replaced...hopefully that's the only thing that fried.
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Old 04-27-2010, 04:35 PM   #4
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Quote:
Originally Posted by Jeff_Ciesielski View Post
Totally fixable. How easy it will be will depend on whether or not you killed any surface mount capacitors in the process.

Also -> Who has to thumbs and called that **** like a pro?
<--This guy .
Yeah, you made my day sad :(.

Im taking it to a computer guru friend of mine. He's worked on **** like this for a good while, he will hopefully be able to fix it for me.
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Old 04-27-2010, 04:35 PM   #5
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Hopefully the track didnt lift
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Old 04-27-2010, 04:40 PM   #6
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Originally Posted by Braineack View Post
You don't need the one labeled MICA underneath it. But it's a tip125.

the 5V voltage regulator can be picked up at radio shack and replaced...hopefully that's the only thing that fried.
so the 5v is the one that you can barely see?

what is the tip125 used for?
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Old 04-27-2010, 04:49 PM   #7
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Originally Posted by flier129 View Post
Yeah, you made my day sad :(.
Sorry for that :(. Look on the bright side though, at least you were saved from dumping a bunch of money chasing gremlins while all the while the megasquirt had fried bits.

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Hopefully the track didnt lift
Also a good consideration, but the MS boards are built pretty sturdy.
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Old 04-27-2010, 05:13 PM   #8
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Quote:
Originally Posted by flier129 View Post
so the 5v is the one that you can barely see?

what is the tip125 used for?
The 5v reg (U5) is the left-most TO220 part.

The two TIP125s are part of the PWM damping circuit, which are used only when you are running low-impedance injectors.
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Old 04-27-2010, 05:30 PM   #9
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Oh I see that I fried 3 transistors. That 5v, the most left-most one that Joe said and the two tip125s near where it says MICA. Im going to replace all of them for sure though.

The track doesnt look to be lifted or swollen in any way as well.


Another thing, when I plugged a plug to check spark, when I turn the key over it sparked, but wouldn't spark when I was cranking. Is that because the 5v is fried?
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Old 04-27-2010, 05:33 PM   #10
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it'll spark with power on. but it's now not seeing your CAS input. If the insulators underneath the TIP125s failed and the body is making contact to the heatsink it will fail to operate...plus it's not getting VCC power to most things from the 5v reg that blew.
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Old 04-27-2010, 05:37 PM   #11
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Quote:
Originally Posted by Braineack View Post
it'll spark with power on. but it's now not seeing your CAS input. If the insulators underneath the TIP125s failed and the body is making contact to the heatsink it will fail to operate...plus it's not getting VCC power to most things from the 5v reg that blew.
Cool, makes sense. Now I just need to get it fixed.
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Old 04-27-2010, 06:07 PM   #12
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hope you didn't fry the processor!

Last edited by WestfieldMX5; 04-27-2010 at 06:24 PM.
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Old 04-27-2010, 06:28 PM   #13
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hope you didn't fry the processor!
The CPU, ironically, is not the most expensive component in that device. DIY sells 'em for $18.
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Old 04-27-2010, 06:32 PM   #14
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The CPU, ironically, is not the most expensive component in that device. DIY sells 'em for $18.

What are the chances the processor and other important components went out as well? I've seen some pretty worn down processors from overclocking but this is a totally different ballgame lol.
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Old 04-27-2010, 06:45 PM   #15
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I've had two boxes in my hand that had caught on fire...only a few select spark circuit components were bad. everything else was fine! Looked a LOT worse than yours.
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Old 04-28-2010, 09:44 AM   #16
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WOW looks like the Mega Squirt is pretty sturdy!!!!!!
wow, looks like you are going to be banned soon...
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Old 04-28-2010, 11:10 AM   #17
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It's possible you may have fried D12 or MOV1 as well. But I have fixed ECUs with worse damage than what I can see in that picture.
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Old 04-28-2010, 11:48 AM   #18
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It's possible you may have fried D12 or MOV1 as well. But I have fixed ECUs with worse damage than what I can see in that picture.
here

Are those transistors as well? If so which ones are they and can I buy them from somewhere?
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Old 04-28-2010, 11:56 AM   #19
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D12 is a diode. MOV1 is that big flat disc thing.
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Old 04-28-2010, 12:25 PM   #20
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Sorry about the bad news. I do have one question though. Why were you running the 01 alternator? Is there a perceived benefit to running it or was it just what you had laying around?
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