Laptop Lead Repair?

Status
Not open for further replies.
TheJay said:
This is interesting, I think that the PSU element is glued though, so I don't think it would be feasible to replace the entire length like this?

Click to expand...

What do you mean by 'element'? - whatever you mean, it's the wrong term in English.

If you mean the PSU itself, then they are glued together, but are easily cut apart (hacksaw or Dremel) and then glued back together.
 
That's what I mean, I didn't want to make a mess cutting it open. Surely that's going to look messy? Also, what kind of glue to you use to stick it back together? It would need to be very resistant to heat.
 
You may have noticed these cables ONLY have 3 wires. V+, V- and Remote sense to regulate the out voltage due to losses in the cable. The better ones use 4 wires.


I might challenge my surgical skills to repair the broken cable connector and reinforce with polyurethane for strain-relief. But it is not easy to just cut and remove all the jacket material to splice and heatshrink the wires. So replacing the entire cable may be easier. Any questions?

The case seal is tack glued and may be cracked open. But you should expect lots of shields and stuff that must be glued back together. A chinese repair shop might be your best bet or replace with a universal charger.

https://www.amazon.ca/Powseed-Unive...ompatible/dp/B0711MP9ZX/ref=asc_df_B0711MP9ZX or get one with your AC plug.
 
Last edited:
TheJay said:
That's what I mean, I didn't want to make a mess cutting it open. Surely that's going to look messy? Also, what kind of glue to you use to stick it back together? It would need to be very resistant to heat.
Click to expand...

That's why you cut it, rather than crow-baring it, which often breaks the casing - just carefully saw round the join where it's glued, then afterwards just glue it back together with epoxy resin - wrap insulation tape round it to hold in place while the epoxy cures.
 
Thanks for your replies.

I discovered it's possible to non-destructively open the case of laptop PSUs. Aside from a 1mm piece of plastic inside, there is no other damage to the plastic.



This is an OEM charger, yet it only has three pins. So, whether or not four is better, this tells me I need three wires.

Time to get ordering.
 
Sounds good to me!

Out of interest, how come the solder on the three wires where they go through the circuit board is dome shaped? It's not like that elsewhere. I've never seen solder like that before, do I need to replicate and if so, how is that done?
 
No, you don't need to try and duplicate it - it's simply had too much solder applied.

The rest of the board will have been flow soldered, but the external wires are added by hand - and whoever did it isn't very good at soldering.
 
TheJay said:
how come the solder on the three wires where they go through the circuit board is dome shaped?
Click to expand...
It looks as though there is some kind of ferrule crimped on to the end of the wires, and whoever soldered the wire/ferrule onto the board used a BIG BLOB of solder.

TheJay said:
It's not like that elsewhere. I've never seen solder like that before,
Click to expand...
Good.

TheJay said:
do I need to replicate
Click to expand...
No, big blobs like that are considered to be bad technique and would fail any critical QA inspection.

Ideally you should be able to see the outline of the wire to ensure that the solder has "wetted" the wire surface and made a good joint.
Anything could be happening under that blob. Yuk.

JimB
 
Status
Not open for further replies.

Similar threads

S
  • Question
Lead acid battery Regenerator (12KW pulse power) DiY - worth a try?
Replies
13
Views
3K
Tony Stewart
A
  • Question
How to quickly estimate lead acid battery capacity ?
Replies
17
Views
8K
azaxi
A
S
Acer Aspire 5742Z Laptop Motherboard
2
Replies
24
Views
6K
simplebeans
S
J
Moving laptop power supply inside the case: Considerations
Replies
19
Views
6K
jester
J
A
  • Question
Faulty components function within SMPS leading to be weak current
Replies
4
Views
3K
schmitt trigger
S
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…