Thinkpads Forum

Does anyone know 1) of a source for the 20V power supply plugs so I can replace one that is (or the wiring to it is) intermittent, and 2) which conductors on the cord go to which connections on the plug?

The cord has two conductors -- an inner conductor and outer shielded conductor . The plug has three connections: for the center pin, for an inner-coaxial contact, and for the the outer metal part of the plug.

I tried pulling apart the bad plug but lost the connection layout in the process. I think the inner conductor goes to the pin connection, and the outer shielded conductor goes to both the inner and outer coaxial parts of the plug. It didn't work when I wired that up, but I may have damaged the plug beyond repair. Thanks!

Here it is:
http://www.google.com/imgres?q=thinkpad ... =102&ty=65

I took a failed T41 72 Watt Adapter apart. The DC (thinkpad side) plugs have frail sheilding and small wires. Fixing it would require great skill.

Now I fixed the FET and related parts on a Tektronix P6045 Probe (circuit board two sided and the size of a cigarette only just flat). The probe works to this day. So I am not unskilled.

However, there is no way I could fix the plug on a thinkpad adapter. The costs (damaged thinkpad) could be high.

Just purchase a new adapter. They are cheap. ... JDH

Man, I'm lucky I didn't zap my machine. I see why it didn't work. While dissembling the plug I saw remnants of what seemed to be a resistor but thought "No, can't be." Buying a new adapter.

/me chuckles - Yes, you are indeed lucky. Glad to hear you did not zap your thinkpad.

I am used to fixing small stuff (Tektronix P6045 probe front end; Tek 455A2B2 Channel 2 input resistor in shreds; Tek 7A24 400MHz amplifier channel 2 digital readout wires broken from attenuator board and re-attached and stuff like that).

But I don't try to fix unfixable things. Cheers. ... JDH