instrument cluster repair questions

[Phil Rose]

Hi David,
Below is something I copied from a couple of of my old posts. The IC 
issues that I fixed involved (1) the "bouncing speedo needle" as well 
as (2) the "hi-beam/turn-indicator" problem. The latter issue is 
solve with simply adding that extra wire, while the first problem 
required re-soldering the crack found at the base of those pair of 
pins (shown).  I did have a brief recurrence of the speedo "bounce" 
but that seemed to fixed itself after a short time, though I suspect 
my resoldering job needs to be done again...some day.

>I fixed mine about a year ago --after doing two things. First-- was
>to run an extra ground wire as shown in the following link.
>http://www.lanikamal.com/audi/dashboard.html?
>
>   That repair wire jumpers over a crack that commonly occurs in the
>upper PC board's circuit--a crack which prevents the "other side"
>(left side in the photo) of the board from having a good ground.
>That crack tends to occur near  the base of a small two-pin
>connector (you can see the underside of this connector in the second
>photo--two small holes and associated solder points). Merely
>installing this repair wire as shown serves to cure a common problem
>with the IC, whereby there is very dim IC backlighting along with
>simultaneous display of both green turn-signal arrows (also
>erroneous indiication of high-beam headlights). But this "fix" alone
>was *not* enough to cure my bouncing speedo.
>
>It happens that a crack (or cold solder joint) can also occur at the
>base of the little (green plastic) 2-pin connector, and this can be
>the  cause of  the bouncing speedo needle. A bad solder joint at the
>base of this 2-pin connector makes the connector unable to
>adequately ground its mating pins (these pins carry ground to the
>speedo circuit board below). Using an 8x magnifier, I was able to
>see a faint crack right at the soldered metal base of the 2-pin
>connector. I heated this spot carefully with my low-wattage
>soldering iron and my bouncing speedo was fixed. At least for the
>time being (one year so far).
>
>I've added [a 3rd] photo that shows the two small "speedo ground pins"
>which are located near the top edge of the IC (--arrow-- at bottom
>of photo); here they're shown emerging from the white, intermediate
>circuit board cover. When the uppermost circuit board is put in
>place, these pins must slide into the 2-pin connector discussed
>earlier.

Photos of my repairs here (includes wire jumper
added to fix hi-beam and turn-signal issue):

http://phil-rose.com/miscellaneous/IC_repair_photos/photo_1_solder_fix.jpg

http://phil-rose.com/miscellaneous/speedo_ground_pins.jpg
>
http://phil-rose.com/miscellaneous/IC_repair_photos/photo_2_reassembled_IC.jpg


>This all probably sounds about as clear as mud. Will be easier to
>understand once you have the IC removed and begin disassembly. Use
>only a low-wattage iron.

Phil



>So I am trying to repair what seems to be a common problem with my 200t 20v.
>The turn signal lights come on when the headlights are turned on, It 
>seems that I need to resolder
>some connections in the IC.  I found some instructions at SJM, but 
>from searching the archives it seems
>that there is another set of instructions available that may provide 
>some additional insight.
>I was unable to find these using the archives.
>
>Can someone point me to these?
>
>
>
>   David Glubrecht
>  			  		 
>_______________________________________________
>200q20v mailing list	 http://www.audifans.com/mailman/listinfo/200q20v


-- 

Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net