LCD Clock

So, I have - quite bravely I think - stripped down my dashboard display cluster.
Car is a 93 Cabrio. This is the display: -


This started as an exercise to investigate a non-functioning temperature gauge. Following several threads, (Notably Briano – thanks again!) I have now isolated the gauge, applied 9v and found that it works OK. Thus, my problem is elsewhere in the wiring between the head sensor and the gauge. Investigations are ongoing and will proceed further when the better weather returns!

Whilst in the vicinity I thought I would strip out the LCD Clock and see if that would operate with 9v across the terminals. Answer – NO!
Looking at the display there appears to be evidence of “bleed”, so I suspect I’m looking at a new one. Not surprising given that the car has been off the road for some years.

I’ve located several sources of the “Repair Screen” but I’m unclear how I progress from here and/or how that fits into what I have now stripped out. This as far as I have got: -



Does anybody have: -1. A spare working clock assembly at a reasonable price?2. Any experience of replacing the display?3. Any suggestions for a source of new parts? VW Heritage offer this https://www.heritagepartscentre.com/uk/161919203-digital-clock-display-kit.html I’ve found similar at “Campervan Culture”.

Any help or advice gratefully received!!

The LCD surround is 2 pieces and can be unclipped to remove the LCD I think. Can't remember for sure but there might be a retaining screw holding it to the circuit board
I replaced my LCD years ago when the original bled and stopped working

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Hi,

I have located and ordered a "Clock Repair Screen" - I'll let you know how I get on with fitting it.

Have also managed to fry my two Red LED's. Srupid Boy!

I found the clock display repair kit from "Brickwerks" . They are primarily T3/T4 and Van people but it seems the clock assy was pretty much universal across VW/Audi in the the 90's

As well as being considerably cheaper than other sources, their tech guy was very helpful and they provide clear and concise instructions vie YouTube.

Fitted today and we have a Display!!

Very impressed and highly recommended!!

Well done, good to hear it can be done though sounds like it's not an easy job.

I've a suspicion I might be looking back at your post when the time comes to sort my own out, thanks for updating.

Hi, ive just performed this repair using a screen from Heritage. I’ve reassembled the instrument binacle mostly but is there a way to test its working before putting back in the car? Looking at the long connector strip, the far right connector is labelled ‘Plus’. Can i connect a 9v battery to this and the negative somewhere else to make it light up and test?

Hi [mention]Briano1234 [/mention] , any comments mate?


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Apologies

I spotted your first post but I've just had a busy couple of days…

I can't really comment other than to say that I wanted to do as you suggest but didn't because I couldn't identify the terminals and was afraid to fry the new display with reversed polarity.

I wish I had because - despite what I had read - although I now have a display it has never "settled down" and I still don't have a correct display.

I was - and still am - reluctant to strip it all again because the flexible PCB is sooooo fragile.

So - if you can work out a way of testing the display before reassembly - it would a VERY good thing to do.

Sorry I can't be more help      Peter

I suspect that you could use a 9vDC battery to power it,  as I have not used that trick on a speedo but have used it often on the fuel and cluster.  

Thanks. Do yuo know which pins on the long connector would power the LCD up?

 

gregpank said

Thanks. Do yuo know which pins on the long connector would power the LCD up?

Not specifically on the lcd assembly but on the back of the cluster it should be: the red wire and the brown pin 2, If you are working on the lcd outside of the cluster look  for the two pins that mate to the cluster mylar, and that would be where you jump it with the battery,,if you reverse polarize it just reverse the leads.

I just went ahead and reassembled everything. Everything works including a complete LCD screen (no missing pixels), but i have these characters and the HH and MM buttons have no effect.
Is this an error code of some sort? Or more worryingly did i put the new LCD screen in the wrong way around (pretty sure I didn't!)..?!?

Quick update: disconnected the battery and no. 7 fuse for an hour and some sort of progress I think..?!? Although HH and MM buttons still do nothing…



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