Been in there and resoldered , still intermittant.
Don't think its a break inside the power lead. Seems to be in an annular
sense, if the line "plug" lays in one "o'clock" angle then contact breaks.
Tried cleaning plug and socket of coarse,and contact treatment oil and
nothing obviously wrong with line plug plating/surface, but before
trying to replace plug and socket , what to try?

N_Cook wrote:

Been in there and resoldered , still intermittant.
Don't think its a break inside the power lead. Seems to be in an annular
sense, if the line "plug" lays in one "o'clock" angle then contact breaks.
Tried cleaning plug and socket of coarse,and contact treatment oil and
nothing obviously wrong with line plug plating/surface, but before
trying to replace plug and socket , what to try?

Is this the triple-coaxial plugs they use on Dells? The outer barrel is
gnd, the inner side of the barrel is +19.5 V, the center pin is some
resistor or something that classifies the power supply's capacity.

I'm not exactly sure what kind of contacts are in the laptop's socket, the
supply's plug doesn't have any springy parts in it. I'd guess the laptop's
socket contacts have gotten worn or lost their spring temper.

Jon

On 13/07/2016 20:41, Jon Elson wrote:
N_Cook wrote:

Been in there and resoldered , still intermittant.
Don't think its a break inside the power lead. Seems to be in an annular
sense, if the line "plug" lays in one "o'clock" angle then contact breaks.
Tried cleaning plug and socket of coarse,and contact treatment oil and
nothing obviously wrong with line plug plating/surface, but before
trying to replace plug and socket , what to try?

Is this the triple-coaxial plugs they use on Dells? The outer barrel is
gnd, the inner side of the barrel is +19.5 V, the center pin is some
resistor or something that classifies the power supply's capacity.

I'm not exactly sure what kind of contacts are in the laptop's socket, the
supply's plug doesn't have any springy parts in it. I'd guess the laptop's
socket contacts have gotten worn or lost their spring temper.

Jon


Although the pin of the chassis socket is shrouded so could be 3 wire, I
think the line plug is 2 contact. Taking a closer look at the line plug
its probably a plating problem on the patch where the cable would
normally have lane "o'clock" sense.
I'll try and confirm the plug is 2 contact only and try finding a
replacement and fudge-jumper that in initially.

Jon Elson wrote:

Is this the triple-coaxial plugs they use on Dells? The outer barrel is
gnd, the inner side of the barrel is +19.5 V, the center pin is some
resistor or something that classifies the power supply's capacity.

More than just a resistor, I think it's a 1-wire bus.

This is a Samsung n102 notebook. 2 contacts to the single ring contact
in the chassis socket. So the small one presumably an insertion switch
,for whatever reason, and the other for current.
In the process of bending the arm wiht a needle, the contact end , at
the open end of the socket, sprung out from behind the lip. Luckily
while bending out while pressing down on the tip to try and get it back
in , it reinserted behind the lip. So next time , while bending the arm
radially inwards, hold the tip in wiht a jeweller screwdriver blade.
Leaves what is the function of this switch, just enables/disables the 2
colour charging LED and display light level setting ? locks out the
inboard charging after an unknown time after loss of switch contact for
some unknown reason?
I never thought to check the pc battery charge gizmo, just noticed the
LED going on and off and display backlight dipping/brightening.

Andy Burns wrote:
Jon Elson wrote:

Is this the triple-coaxial plugs they use on Dells? The outer barrel is
gnd, the inner side of the barrel is +19.5 V, the center pin is some
resistor or something that classifies the power supply's capacity.

More than just a resistor, I think it's a 1-wire bus.



But whatever it is, it's not too complex. My non-Dell laptop supply
has a special adapter for Dell laptops. It's a bit larger that the
other plugs and it does fool the laptop into charging.