MS3x died, not getting power. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 05-19-2017, 08:42 AM   #1
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default MS3x died, not getting power.

MS3x has no 12v or 5v anywhere on the board. JimStim is providing power, and as soon as I turn the stim on, the power led very flickers dimly. I don't see anything burnt on the boards anywhere...

I'm guessing a short or trace fried, but I can't find it.

I've checked at U5, Q9, Q12, etc, etc.....nothing....where do I look now?

I am/was using Frank's alternator board, but have just unhooked it and that red wire to try and eliminate possible problems.

And yes, I know I did a whole lot more crap than I needed to. Wish I would've paid a little more attention and seen those awesome build pages.

Thanks
Attached Thumbnails
MS3x died, not getting power.-1495197498448.jpg   MS3x died, not getting power.-1495197542536.jpg  
KYWalker is offline   Reply With Quote
Old 05-19-2017, 10:03 AM   #2
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,259
Total Cats: 49
Default

To check for a short in the Megasquirt PCB, power up the Megasquirt on a Stimulator or on the car and check the following points for voltage with a multimeter.

You should find the same voltage as the battery voltage on the following points: S12, S12C, the center legs of Q9 and Q12, the left (non-banded) end of D3, the left leg of U5, and the left (banded) end of D9.

You should have 5 volts at the following points: S5, the two +5V holes in the proto area, the right (non-banded) end of D9, the right leg of U5, the left (banded) end of D19, and pins 1, 20, and 31 of the CPU.

Let me know where you find the correct voltages, and where you find the wrong ones.
Matt Cramer is offline   Reply With Quote
Old 05-19-2017, 10:26 AM   #3
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

I'm not showing voltage anywhere. JimStim shows 12v, until connected to the MS3x,then nothing. Power led just blinks dimly.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 10:33 AM   #4
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,280
Total Cats: 1,342
Default

Do you have continuity between power and ground? Sounds like you are shorting out the jimstim.
aidandj is offline   Reply With Quote
Old 05-19-2017, 10:49 AM   #5
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Not between power and ground, but ground and left and middle legs of U5 I do...not sure if those should.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 01:16 PM   #6
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Update: in Diode Test mode, D19/D9/D17 show .165 in both directions...d12 shows 0 in both directions.

Removed one leg of D19:
12v at s12
1mv at S12c
12v at center legs of Q9/Q12
12v at Left end of D3
1.3mv at left left of U5
1.3mv at left end of D9

"You should have 5 volts at the following points: S5, the two +5V holes in the proto area, the right (non-banded) end of D9, the right leg of U5, the left (banded) end of D19, and pins 1, 20, and 31 of the CPU."

I get .66v everywhere above.

Last edited by KYWalker; 05-19-2017 at 02:27 PM.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 02:15 PM   #7
Boost Czar
iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 71,790
Total Cats: 1,615
Default

i see exposed sections of your 12v raw trace coming off the db37...




are you not using an expander board?
Braineack is offline   Reply With Quote
Old 05-19-2017, 02:28 PM   #8
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

I did notice those as well, but i am getting continuity from point to point around them....so I figured they were 'ok'ish.

I am using the expander.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 02:29 PM   #9
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Also, I added some testing updates to post #6.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 02:39 PM   #10
Boost Czar
iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 71,790
Total Cats: 1,615
Default

Quote:
Originally Posted by KYWalker View Post

I am using the expander.
why so many wires and extra circuits on the mainboard then?
Braineack is offline   Reply With Quote
Old 05-19-2017, 02:43 PM   #11
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Red face

Quote:
Originally Posted by Braineack View Post
why so many wires and extra circuits on the mainboard then?
LOL, right?

"And yes, I know I did a whole lot more crap than I needed to. Wish I would've paid a little more attention and seen those awesome build pages."

Basically, because not paying enough attention. Next one though....
KYWalker is offline   Reply With Quote
Old 05-19-2017, 02:47 PM   #12
Boost Czar
iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 71,790
Total Cats: 1,615
Default

ah okay, sorry im not being helpful otherwise
Braineack is offline   Reply With Quote
Old 05-19-2017, 02:54 PM   #13
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
ah okay, sorry im not being helpful otherwise
Maybe not right at this moment, but trubokitty.com has been very helpful finishing the build....just wish I saw that before I had already built 3/4 of it. I think I just got excited and forgot everything.

It might come in real handy if I have to build another to replace this one doh!

Oh, and what started this mess, was of course my fault...forgot to tighten battery cables. Going down the road after changing the breakin oil and positive cable jumps off...very bright dash....then bad.
KYWalker is offline   Reply With Quote
Old 05-19-2017, 04:23 PM   #14
Boost Czar
iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 71,790
Total Cats: 1,615
Default

check the Engine, and Room fuses.

then check the board for all these components:

http://www.msextra.com/doc/pdf/html/...e-1.4-192.html
Braineack is offline   Reply With Quote
Old 05-19-2017, 07:56 PM   #15
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

"You should find the same voltage as the battery voltage on the following points: S12, S12C, the center legs of Q9 and Q12, the left (non-banded) end of D3, the left leg of U5, and the left (banded) end of D9."

I reinstalled D19 (D10 is removed) and have 12v at S12, center Q9/Q12, left D3.

I have 1.3mv at S12C, left U5, and left D9.

Notice that D10 is removed...otherwise, I get the short and no voltage anywhere.

Removed D11 & D12, now get:
.8V at S12C, left U5, and left D9.

Also found more bared traces...although they seem to be intact....between left D10 and left d12

Last edited by KYWalker; 05-19-2017 at 08:21 PM.
KYWalker is offline   Reply With Quote
Old 05-20-2017, 02:25 PM   #16
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Update: I reinstalled D10 and D11.

I get 11.5v at S12, center Q9/Q12.
I get 10.75v at left U5, S12C, left D9.

I get 5v at S5, right U5, 5v Proto.

With D12 installed, I get a full on short....JimStim power led goes out.
KYWalker is offline   Reply With Quote
Old 05-20-2017, 05:08 PM   #17
Boost Czar
iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 71,790
Total Cats: 1,615
Default

replace that bitch.
Braineack is offline   Reply With Quote
Old 05-20-2017, 05:10 PM   #18
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

Wish I had one on hand. Started tearing things apart looking for one, lol. Guess I have to wait.
KYWalker is offline   Reply With Quote
Old 05-21-2017, 08:10 PM   #19
Newb
Thread Starter
 
Join Date: Jun 2012
Location: Western TN
Posts: 35
Total Cats: 0
Default

So I decided to steal D12 from my MS2....still wasn't happy, but it was less unhappy. Then I stole D13 too....seems to be very happy now.
KYWalker is offline   Reply With Quote
Old 05-22-2017, 11:38 AM   #20
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 18,935
Total Cats: 370
Default

Quote:
Originally Posted by Braineack View Post
why so many wires and extra circuits on the mainboard then?
bruh, because he's a legend like me.

y8s is offline   Reply With Quote
 
 
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:32 PM.