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Digital Dash Fried???

BrownDog

Apr 30, 2013
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I have this digital dash of some Chinese motorbike, hyosung I think, anyways I'm currently attaching it to my car and I was trying to find the wire for the temperature sensor and dropped the speedo wire on the positive of the battery and well now it cactus

Now it turns on for a few seconds and then turns off and stays , also a chip on the board gets scolding hot (it actually cooked my fringer a bit). Once the chip cools down again it starts again until it heats up. I did put it in the freezer overnight and it lasted a couple seconds longer.

What did I fry and how can I fix it, can't really afford to buy another one so if I could repair this one that would be good

Than in advance
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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It's the third thing from the left starting at the flux capacitor. Just below the thronomister and between the two dark emitting diodes.

Perhaps if you could provide a picture, pointing out the thing that is getting hot we could be a little more specific...
 

BrownDog

Apr 30, 2013
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It's the third thing from the left starting at the flux capacitor. Just below the thronomister and between the two dark emitting diodes.

Perhaps if you could provide a picture, pointing out the thing that is getting hot we could be a little more specific...

lol. sorry wrote that up lastnight because i couldnt sleep and was just thinking, anyways heres a picture the chip in question is the biggest one there

zx3z0y.jpg
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Can you show me where the spedo wire connects, and can you identify the chip that is getting hot. My guess is that it's the one in the lower right corner that is not completely visible.

Then take a closeup of the board near where the spedo wire connects and around the chip that is getting hot.

You need to take the photo from directly above the board, and do it outdoors in shade without a flash.

The chip that is getting hot is likely to be either a regulator (because of another chip that is drawing way too much power) or a damaged chip. However there are many other possibilities.

If we can figure out what the speedo wire is connected to on the board, we might be able to guess what has been damaged.
 

BrownDog

Apr 30, 2013
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the chip that gets hot is in the centre of the board its the sqaure one, getting a few pictures now
 

BrownDog

Apr 30, 2013
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Apr 30, 2013
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anything that has S/P next to it
2hdv7eu.jpg


2hmlqwm.jpg


heres the chip that gets hot
29p96v9.jpg


outlined the speedo track in red
qqwe36.jpg
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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1) Do you remember what I said about flash?

2) What do you mean "anything that has S/P next to it"? I need to know what the wire was connected to that accidentally came in contact with +12V

3) That big black square thing is a microcontroller. Yes it can be easily replaced. However, it has a program on it that you cannot easily replace (you can probably not replace it at all). If that part is dead, this is probably a total loss.

There is still a chance that the microcontroller was not actually damaged, but something else was and it is that which is drawwing excessive current from the uC causing it to heat up.

Is there any other chip which gets hot?

Can you trace where the wire to the speedo goes on the board. Is that something other than the microcontroller?
 

BrownDog

Apr 30, 2013
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Apr 30, 2013
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yeah i know what u said about the flash, however tis a rather poor day over here and its too dark to no use one

on the board in a few photos there are some metal rings that say S/P that line goes to the speedo wire

yes there is another chip labeled D12

the last photo has the speedo line traced

the board is hard to follow as its two sided
 

BrownDog

Apr 30, 2013
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Apr 30, 2013
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the D12 chip is more directly connected to the speedo wire than the microcontroller

i think its more of a diode than a chip
 
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BrownDog

Apr 30, 2013
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i just swapped the D12 chip with the D11 and nothing has changed so maybe the fault is before this chip
 
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