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Intrument light + Bulb light problem 900 1997

posted by  Metallo on  Sun Oct 27 11:58 CST 2019
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last visit: Wed Feb 29 21:03 CST 2012
[RELATED]

Hi guys,

I have a 940 of 1997, Yazaki dashboard and I have an issue with one of the main 4 bulbs that light up the instrument (3W).

A picture will better clarify what I am talking about.

http://www.mediafire.com/view/77gbmmmggyep5zb/IMG_5835_Marked.jpg

The bulb will light up after about 45 min.

I took the multi-meter and verified both bulb + bulb holder, they are both OK.
As a second test, I removed one of the working bulb+holder assembly and tried if it would work when snapped in the not working bulb spot, no-go.

This leads me to conclude that the issue is not bulb-holder related, but something in the circuit of that assembly.
Obviously, when the thing heats up, after about 45 min., it works.

Can you help me from here?

Thank you!
Alex







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    Intrument light + Bulb light problem 900 1997

    posted by  spook on  Mon Oct 28 10:46 CST 2019
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    last visit: Fri Oct 24 08:06 CST 2014
    [RELATED]

    Dear Metallo,

    Hope you're well. Good work!

    "Heat-driven" intermittancy usually results from micro-cracks in solder joints: reflowing the solder joints usually solves the problem.

    Yours faithfully,

    Spook








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    Intrument light + Bulb light problem 900 1997

    posted by  Metallo on  Sun Oct 27 19:23 CST 2019
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Wed Feb 29 21:03 CST 2012
    [RELATED]

    Hi there,

    I found the problem.
    It was a defective solder under the rheostat, I have redone all the soldering and everything works as new.

    Alex







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