The conversation on this page has been archived and is no longer active.

Shocking powerbook

Message #1 - Posted 2004/07/19 - Simon Higgs

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

Message #2 - Posted 2004/07/19 - Jason Williamson

On 19/7/04 6:21 pm, in article pan.2004.07.19.17.21.47.245490@higgs.me.uk, Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

Mine does the same.
I use two power adapters. The one at work has an earth on it, where the mains lead goes into the adapter the guide pin for the plug is metal and the lead has earth points to contact this pin, using this one it doesn't tingle. But if I use my spare which has a plastic guide pin on the adapter and no points in the lead then it does tingle a fair bit.
Not sure if it is usual though.

Message #3 - Posted 2004/07/19 - Bonge Boo!

On 19/7/04 6:21 pm, in article pan.2004.07.19.17.21.47.245490@higgs.me.uk, Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

No. I sometimes get a "tingling from people's Powerbooks. My TiBook happily remains immune. But it isn't uncommon.

Do you also suffer from erratic trackpad control?

Message #4 - Posted 2004/07/19 - Jim McGowan

On Mon, 19 Jul 2004 19:53:30 +0000, Jason Williamson wrote:

On 19/7/04 6:21 pm, in article pan.2004.07.19.17.21.47.245490@higgs.me.uk, Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

Mine does the same.
I use two power adapters. The one at work has an earth on it, where the mains lead goes into the adapter the guide pin for the plug is metal and the lead has earth points to contact this pin, using this one it doesn't tingle. But if I use my spare which has a plastic guide pin on the adapter and no points in the lead then it does tingle a fair bit.
Not sure if it is usual though.

hmmm... (reaches for multimetre)

nope, no juice on me 15" Aluminium. With or without charger (charger has earth)

Jim

jim underscore mcgowan at mac dot com

Message #5 - Posted 2004/07/19 - Phil Taylor

Previously, Bonge Boo! <bingbong@spamcop.net> wrote:

On 19/7/04 6:21 pm, in article pan.2004.07.19.17.21.47.245490@higgs.me.uk, Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

No. I sometimes get a "tingling from people's Powerbooks. My TiBook happily remains immune. But it isn't uncommon.

Do you also suffer from erratic trackpad control?

I don't know what the outer case of the TiBook is made of (is it actually titanium?), but it's non-conductive. I got 58 volts between the screwheads at the back and mains earth on my 15" 867.

Phil Taylor

Message #6 - Posted 2004/07/20 - Simon Higgs

On Mon, 19 Jul 2004 19:53:30 +0000, Jason Williamson wrote:

On 19/7/04 6:21 pm, in article pan.2004.07.19.17.21.47.245490@higgs.me.uk, Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

Mine does the same.
I use two power adapters. The one at work has an earth on it, where the mains lead goes into the adapter the guide pin for the plug is metal and the lead has earth points to contact this pin, using this one it doesn't tingle. But if I use my spare which has a plastic guide pin on the adapter and no points in the lead then it does tingle a fair bit.
Not sure if it is usual though.

Ah...As my PowerBook was brought in US, I'm using a regular figure-of-8 ac cord. I'm going abroad in a couple of days, I'll pop down to Cancom and get an adaptor kit. See if that helps.

Simon.

Message #7 - Posted 2004/07/20 - zoara

Phil Taylor wrote:

I don't know what the outer case of the TiBook is made of (is it actually titanium?), but it's non-conductive.

It *is* titanium, but it's painted.

-z-

"Analogies are like Vegemite sandwiches in a paper bag." -- PeterD, uk.comp.sys.mac

Message #8 - Posted 2004/07/21 - Peter Lee

Simon Higgs wrote:

I have a 12" PowerBook, and have noticed an odd tingling where my wrists touch the corners. I didn't really pay much attention, until today. I was using the laptop whilst sitting on the sofa, when the corner touched my stomach. I measured the potential. 40Volts between PB and radiator when powered by psu. Is this usual?

Yes, but only when using an unearthed mains lead on the PSU. 15" AlBook

Peter

This address is never read; use
peterattheleesdotukdotnet

Need Help? Have a Question?

Looking for more help, comments, and answers?

Ask your questions on Ask Different. Ask Different is a community of Apple users ready to help.