Hello.
I just solved a mystery with the right USB or HDMI/Displayport or Ethernet or 3.5" jack of Fujitsu Lifebook E558 going suddenly dead.
I realized i had 6 pieces of the same model with the exact same issue, nothing on google, neither schematics so i had to dig in my self and provide feedback here in case someone else has the same issue.
I found out that the USB daughterboard is connected to the mainboard with 2 wide and non bending flex tapes that are 2mm longer than they should and this results in a constant pressure on flex connector and therefore eventually it cracks the solder and desolder completely.
I solder them back with more solder than Fujitsu and they seem pretty tight, time will tell though.
Keep in mind that replacing daughterboard is not a option for 3 reasons:
1) The flex connector can break in daughterboard either on motherboard, not guaranteed it will break on daughterboard only.
2) Daughterboard not available on second hand (ebay etc) , only new for ~100€ Including shipping
3) Fujitsu has used very little quantity of solder on the connector pins, imagine that in most pins i see clean copper, this means that even if you buy another it will crack again.
I attached some pictures to understand the problem.
I hope someone to find this useful
I just solved a mystery with the right USB or HDMI/Displayport or Ethernet or 3.5" jack of Fujitsu Lifebook E558 going suddenly dead.
I realized i had 6 pieces of the same model with the exact same issue, nothing on google, neither schematics so i had to dig in my self and provide feedback here in case someone else has the same issue.
I found out that the USB daughterboard is connected to the mainboard with 2 wide and non bending flex tapes that are 2mm longer than they should and this results in a constant pressure on flex connector and therefore eventually it cracks the solder and desolder completely.
I solder them back with more solder than Fujitsu and they seem pretty tight, time will tell though.
Keep in mind that replacing daughterboard is not a option for 3 reasons:
1) The flex connector can break in daughterboard either on motherboard, not guaranteed it will break on daughterboard only.
2) Daughterboard not available on second hand (ebay etc) , only new for ~100€ Including shipping
3) Fujitsu has used very little quantity of solder on the connector pins, imagine that in most pins i see clean copper, this means that even if you buy another it will crack again.
I attached some pictures to understand the problem.
I hope someone to find this useful

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