Right hand display

Post by **citroenxm** » Tue Mar 17, 2020 5:28 am

First one Ive seen Chris. In mk. 1 and mk. 2..
I've about 10 mk. 1 lh displays.. All good but no market for them as they rarely fail..

Post by **Dieselman** » Tue Mar 17, 2020 8:32 am

Possibly from a LHD car.
I suspect the glass delaminates as a result of damp ingress from the door and windows on unused cars.
I wonder if cars without a sunroof suffer less...

The LCD doesn't bleed liquid, otherwise the letters wouldn't be seen, it is the green glass delminating.

White Exec · Post by **White Exec** » Tue Mar 17, 2020 9:02 am

LH display (bleeding) repair
Have updated the diagram in the link above (LH matrix display repair), and replaced the original Word file with a PDF.
Diagram now appears correctly.

Post by **xmexclusive** » Tue Mar 17, 2020 10:54 am

As stated earlier there is NO green glass in any XM RH displays.
The problem with all RH displays is seal failure of the sealed LCD unit.

White Exec · Post by **White Exec** » Wed Mar 18, 2020 2:07 pm

Happened to have a couple of defective RH S1 displays here, and this is how the display parts are arranged.
Units were
Jaeger 339267-01 (casing label)
Jaeger 189710.06 (main p.c.b.)
Jaeger 189712.02 (illumination p.c.b.)

S1 XM RH display_contruction v2.pdf

Interesting to see that the front-most part of the display (the part you can touch on the dash) is not actually glass, but a smoky plastic polarising film. It has the glass LCD sandwich immediately behind it.

EDIT: v2.pdf above contains connections for bench testing the module

Assich · Post by **Assich** » Wed Mar 18, 2020 2:53 pm

Can someone point me in the direction of plastic coer/glass delamination repair?

Post by **xmexclusive** » Wed Mar 18, 2020 7:22 pm

As I stated above there is no repair for the bleeding on these RH displays.
If the smokey plastic polarising film is peeled away it becomes clear that the bleeding is still present.
It is caused by a glue failure of the LCD sandwich that lets air into the liquid crystal fluid area.
This type of LCD fault cannot be repaired.
The only fix is to find a display that has not leaked.
A few years ago I worked through testing a batch of some 30 assorted RH displays.
In a quick search now I can find 5 displays discarded with serious bleeding but think there must be another 4 or 5 that were rejected.

White Exec · Post by **White Exec** » Wed Mar 18, 2020 9:39 pm

Just thinking aloud on this...

The repair I described to the LH (matrix) display, which had a bad bleed inside the LCD sandwich, was effected simply by transferring the polarising filter from one side of the LCD unit to the other, and angling it appropriately. Nothing was done to the LCD glass sandwich itself.
This caused the bleed to disappear - details are in the post (link above).
Wondering whether the same/similar could be done with a bleeding RH display?

I don't think I have a spare working RH display unit here; both of them have dud electronics.
Maybe someone else could try it?

Post by **xmexclusive** » Thu Mar 19, 2020 10:23 am

Hi Chris

This started as a request for a working or repaired display.
I think we should find a suitable place in the technical section to continue the design and repair issues.

White Exec · Post by **White Exec** » Thu Mar 19, 2020 11:50 am

Agreed, John -
Could you move Paul's post Mon Mar 16, 2020 10:08pm onwards to here, upfront? ---> viewtopic.php?f=8&t=9775#p116724
Thanks.

Am putting a post of mine there just now. One there from Assich, too.

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