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Speedometer Woes
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vaho   
Fri Oct 27 2017, 01:19pm
Joined: Jun 25 2015
Member No: #2228
Location: Tallinn
 Sure but maybe the 8 legged one can be replaced with 3 legged one because there is actually only three contact points, or so it seems. So then when the legs of this one will fit then it can be installed:




As said I am no expert in this field.
Paulius   
Fri Oct 27 2017, 02:19pm
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
 Ok, so I've ordered both chips. I'll try to do some research while I wait for the parts and will consult with an electronics guy if it indeed is possible to just use the 3-legged part. Will let you all know as soon as I figure this out!
e3steve   
Sat Oct 28 2017, 07:24am
Joined: Jan 21 2013
Member No: #1163
Location: Warsash, Hants & Palma de Mallorca, Spain
Paulius wrote ...

vaho wrote ...

This one is available:

- Click Here -

Yes, but it would be nice to have the more powerful version so that it would not get as hot.
Or bond a piece of heatsink onto them...?
C6Dave   
Sat Oct 28 2017, 09:32am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
e3steve wrote ...


Or bond a piece of heatsink onto them...?

Is there room for a 12v fan from a computer power supply or CPU....?
Website
Paulius   
Sat Oct 28 2017, 07:33pm
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
Dave-Retired wrote ...

e3steve wrote ...


Or bond a piece of heatsink onto them...?

Is there room for a 12v fan from a computer power supply or CPU....?

There are smaller fans than those from computers. I would go for some micro heatsinks as mentioned above. I tend to think that there are only a few components worth cooling anyways.
Paulius   
Tue Apr 17 2018, 07:59pm
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
 Okay, an update.

My instrument cluster was still mostly working, it would tend to not power up in colder weather. But I didn't want to risk it burning out so I finally managed to do the "fix".

I decided to go with the original 8-legged MOFSET chip and just added a radiator to it so that it wouldn't get as hot. Hopefully it will last for another 250K kilometers

I've attached a picture showing the solderjob a local electronics shop did and the "radiator".

Unit powered right up from the first "blink" and is working brilliantly now.

Paulius   
Thu Apr 19 2018, 03:05pm
Joined: Aug 14 2014
Member No: #1821
Location: Vilnius
 Damn it.. This morning it failed to power up again...
When dismantling the unit i couldn't help but notice a small shard of glass inside. Could it be that it somehow got craked ant the gas pressure from the display itself escaped, making it "difficult" to power up when cold?
vaho   
Thu Aug 16 2018, 04:03pm
Joined: Jun 25 2015
Member No: #2228
Location: Tallinn
 Hi all. Yesterday was the day when my cluster gave me a puff of smoke followed by total darkness.
After opening it up it was clear that the mosfet transistor was burned. During the checking the specialist also found out that one of the two usual transistors was also bad.






It was time to search the parts. Could not find them according to my earlier suggestion in this thread so went to the local electronics store and the guy gave me substitutions. Had my doubts but after all was soldered and connected to the car the instrument cluster worked again. Success!!
The soldering job is done very well.





The parts that I ended up using:
Mosfet - IRF9321PBF, P-FET, 30V, 15A, 1,5W SO8
Transistors - TSM05N03CW, N-FET, 30V, 5.0A, 3W, 0.06R, SOT223





These parts are supposedly much more powerful than the originals so who knows. I have not too much knowledge about this stuff but I am happy that my speedometer works again.
Overall cost was 2,50 euros for parts (one mosfet and two other transistors) and 40 euros for soldering job, total 42,50 euros
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