I have an interesting problem. I have a Dell 2405WFP monitor (acquired second hand, history unknown). It had the usual problem with bad caps, which I fixed. It also appears that it took out one of the converters on the logic board (loads the 19V supply (checked with no load) down to about 14V if I connect the logic board, fails to power up when connected, etc), but I need to troubleshoot that further. I'm not really that worried about that since it seems to be fairly common and I work on DC-DC converters for a living.
The interesting problem is like this. The LVDS cable on this monitor is part twisted pair wires and part flat flex cable. The flat flex looks fine, but the insulation of the twisted pair wires is crumbling and falling off. Literally, just unplugging it, much of the insulation crumbled off into my hand (and I was trying to be gentle). It doesn't fall off in large chunks, its tiny little pieces, like dust. Also, this harness has straight wires in it for power or something low speed. Those look perfectly fine. Its just the twisted pairs (which go through a manufactured, shielded cable) that have problems.
So, has anybody heard of this? I'm in the electronics industry and what one of my coworkers tells me is that this is typical of wires that have been overheated, but I've never seen insulation degrade like this - the overheated PVC wires I've seen have the insulation fall off in chunks, not dry dust like this. Also, other than the wires, there's no signs of overheating. So, I'm wondering if perhaps the panel itself has been fried or if this is just a manufacturing defect?
If it is just a manufacturing defect, anybody have some suggestions for repair or replacement? I can't find any on ebay and googling the part number on the label (50.L1E04.001) shows very few results. I doubt the the manufacturer would even talk to me about getting a replacement, assuming they had any. But, repair is difficult since these are tiny high speed differential pairs, so splicing is a bad idea as is covering with heat shrink since I will never be able to get the twist back right. I might be able to get the connectors and pins, but I'm sure I don't have the right crimpers for these.
The interesting problem is like this. The LVDS cable on this monitor is part twisted pair wires and part flat flex cable. The flat flex looks fine, but the insulation of the twisted pair wires is crumbling and falling off. Literally, just unplugging it, much of the insulation crumbled off into my hand (and I was trying to be gentle). It doesn't fall off in large chunks, its tiny little pieces, like dust. Also, this harness has straight wires in it for power or something low speed. Those look perfectly fine. Its just the twisted pairs (which go through a manufactured, shielded cable) that have problems.
So, has anybody heard of this? I'm in the electronics industry and what one of my coworkers tells me is that this is typical of wires that have been overheated, but I've never seen insulation degrade like this - the overheated PVC wires I've seen have the insulation fall off in chunks, not dry dust like this. Also, other than the wires, there's no signs of overheating. So, I'm wondering if perhaps the panel itself has been fried or if this is just a manufacturing defect?
If it is just a manufacturing defect, anybody have some suggestions for repair or replacement? I can't find any on ebay and googling the part number on the label (50.L1E04.001) shows very few results. I doubt the the manufacturer would even talk to me about getting a replacement, assuming they had any. But, repair is difficult since these are tiny high speed differential pairs, so splicing is a bad idea as is covering with heat shrink since I will never be able to get the twist back right. I might be able to get the connectors and pins, but I'm sure I don't have the right crimpers for these.
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