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Carbon track ribbon cable end, repairing

Hi, I have a small LCD display where the edge has a 60-track ribbon cable going to the motherboard. The cable is clear plastic with very thin carbon tracks. The end going to the PC board has gone intermittent, so I pulled it off. Apparently it was glued on with some gray goop.

The carbon tracks on the end of the cable have mostly pulled off the plastic. I could cut off the bad end as there's about 1/4 inch of slack in the cable BUT:

(1) There's some beige painted-on insulation over the carbon. It comes off with acetone, but so do the carbon tracks! How do I get the beige insulation off without hurting the delicate carbon underneath?

(2) What do I use to glue the cable back on? Or should I fashion a clamp?

Help!

Reply to
Ancient_Hacker
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How are the conductors of the ribbon connected to the conductive lands on the LCD glass ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
n cook

Reply to
spudnuty

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As far as flexible ribbon replacement I usually plait up fine 40swg enamelled/magnet copper wire into a braid, in this case 6,7,7 wires plaited, cut into 3 and then those 3 plaited together . This is very flexible and seems long lasting. Identify the order of conductors , bypass the ribbon connector at the pcb end and solder direct to the pcb. The problem is the LCD end. If it is proper metal in the ribbon it is possible to cut close to the LCD it may be pssible then to grind back the covering to give some land pads. How to remove the glue without removing the conductive deposition lands on the LCD edge. I would try squashing each stripped wire end in steel plates, risking work hardening but as conductive glued/painted to each land and then overall glued that should be ok, any inter-trace overpaint/shorts cut back before total curing. It is the safe removal of existing LCD contacts that is the problem. I've never tried the LCD part of such a repair but would very localised heat like SM re-work hot air gun work to release without destroying the conductive glass coating or crack the glass ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
n cook

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