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display fading (MFD B, not bulb related)
#1
Hi all,

Decided to upgrade my MFD to the 3 lines one (ECRAN B) and bought one from peugeot 307 (2003). Displays everything, e.g. mpg, temp, etc., but gradually the orange letters fade (become black and merge with background), especially around the edges. The wife has taken the camera at the moment, but will post one later.

It is not bulb related, as I can see the 3 bulbs working, if I take the white plastic apart. Thought it is a dodgy display and bought another one. Same thing, letters start to fade as heat builds up. If I turn up the heat from the car heater the fading becomes worse. My current display (2 lines, MFD A, 2007) works absolutely fine with the same bulbs. If the display is cooled down it works and then gradually (20min) fades.

Has anyone else experience similar thing with the 3 lines display? Is there any solution? There was a video on youtube to use a heat gun and try to re-seal the dry joints of the lcd connector, although the author said it did not solve the problem. Should I buy a connector and see if it helps or there is damage to the lcd from progressive heat over the years. I could buy 509T LEDs to see if this helps with the heat, but the heat from the heater will still be there.

Any help is more than appreciated.
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#2
I have the same since upgrading mine. I find that if you press on the screen, the display becomes bright againn.

Haven't found a solution though
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#3
(12-10-2013, 07:06 PM)Coco Wrote:  I have the same since upgrading mine. I find that if you press on the screen, the display becomes bright againn.

Haven't found a solution though
Sounds like poor connection somewhere.
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#4
At least mine does not look like connection problem. Sure if I press on the screen, it seems like locally, where my finger was, it is alright for a microsecond or so.

What I read is that newer models have this sorted, but what year or display part number I do not know.

Have another display MFD B, but from Citroen C5/8, the one with green, instead of orange background and black letters. This does not fade at all. Only difference the background and black letters. Will replace colour diffuser at the back tomorrow to get orange background, letters unfortunately will have to stay black.
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#5
A few pictures as well.

Citroen C5/8 non-fading display.
   

cold MFD B display
   

Hot, pretty much non visible letters
   
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#6
I had the same problem with my original display, this appeared out of the blue after several disassemblies of centre trim.

Decided to replace with mentioned green C5 display but problem remains, for sure it is not a bulb related problem.

Sometimes I notice slight improvement and suspect some dodgy wiring but not to good with auto electrics.

Would be very grateful if someone could shed any light on this issue
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#7
There appears to be similar problems with other displays. As far as I can work out from the multiple cycles of expansion and contraction due to heat and the vibrations from the car the PCB ribbon could detach. Potential solution in the attached pdf.

Do not know if this will help, but as I have 3 displays I will try with one if I have time over the weekend.


Attached Files
.pdf   How to remove and re-attach LCD Ribbon from a PCB with a Fine Pitch.pdf (Size: 2.07 MB / Downloads: 25)
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#8
Link to original article http://www.instructables.com/id/How-to-r...om-a-PCB-/
as the pdf has some pictures obscuring the text (at least on my pc it does).
Malc

Stupid computer!
Security system should not fail safe!
Security system should fail dangerous!
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#9
(16-10-2013, 08:04 AM)crickleymal Wrote:  Link to original article http://www.instructables.com/id/How-to-r...om-a-PCB-/
as the pdf has some pictures obscuring the text (at least on my pc it does).

Yes, apologies. Completely forgot to put the link.
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