Repairing Thinkpad chargers

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Repairing Thinkpad chargers

Timothy Murphy-4
I have a couple of Thinkpad chargers which do not work.
I was just wondering - before I throw them away -
if there is any common cause for charger failure
that can be remedied reasonably simply?

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Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin

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Re: Repairing Thinkpad chargers

cristian bono
see this link


You Break Ifix Computer Lab Cell Lab
631 484 2735

On Feb 21, 2015, at 10:05, "Timothy Murphy" <[hidden email]> wrote:

I have a couple of Thinkpad chargers which do not work.
I was just wondering - before I throw them away -
if there is any common cause for charger failure
that can be remedied reasonably simply?

--
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin

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Re: Repairing Thinkpad chargers

Henrique de Moraes Holschuh-2
In reply to this post by Timothy Murphy-4
On Sat, Feb 21, 2015, at 12:03, Timothy Murphy wrote:
> I have a couple of Thinkpad chargers which do not work.
> I was just wondering - before I throw them away -
> if there is any common cause for charger failure
> that can be remedied reasonably simply?

Faulty cabling and connectors.  Anything else requires electronics
repair (which is doable by anyone used to repairing switching power
supplies, though).

You can sell or donate the lot of them as "broken parts for repair work"
instead of throwing them away, btw.

--
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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Re: Repairing Thinkpad chargers

Timothy Murphy-4
On Monday 23 February 2015 09:15:22 Henrique de Moraes Holschuh wrote:

> > I have a couple of Thinkpad chargers which do not work.
> > I was just wondering - before I throw them away -
> > if there is any common cause for charger failure
> > that can be remedied reasonably simply?
>
> Faulty cabling and connectors.  Anything else requires electronics
> repair (which is doable by anyone used to repairing switching power
> supplies, though).

Thanks for your response.
"Electronics repair" is not my forte, unfortunately.
I don't think there is anything wrong with the connectors -
I've had other Thinkpads in the past with faulty connectors -
I suspect in the computer rather than the charger -
and found this problem surprisingly difficult to solve.

I've just been clearing out old computers,
and found 6 faulty Thinkpads, mostly T23's or other T2?'s.
I've 6 working Thinkpads left, one T23, two T43's,
T60, T61 and T520.
I'm surprised how well the T23 works, under XP and Fedora-11.
I'm confirmed in my disbelief that computers are getting
better and better ...


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Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin

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Well-Made Computers (Was: Repairing Thinkpad chargers)

heroxbd
Timothy Murphy <[hidden email]> writes:

> I'm surprised how well the T23 works, under XP and Fedora-11.
> I'm confirmed in my disbelief that computers are getting better and
> better ...

I have the same disbelief, especially when comparing a well-made T23 to
a modern fast-food-like made-in-a-rush-and-pushed-by-commercialism
computer, and when taking bloatware into account.

Benda
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

Paul Seelig-3
On 03/05/2015 12:15 AM, [hidden email] wrote:

> Timothy Murphy <[hidden email]> writes:
>
>> I'm surprised how well the T23 works, under XP and Fedora-11.
>> I'm confirmed in my disbelief that computers are getting better and
>> better ...
>
> I have the same disbelief, especially when comparing a well-made T23 to
> a modern fast-food-like made-in-a-rush-and-pushed-by-commercialism
> computer, and when taking bloatware into account.
>
While the T23 was a really nice machine back in its days which even
remained useful for a long time afterwards, in my not so humble opinion,
the sweet spot for a well made Thinkpad is the T60/T61 generation.

The main reason for this is that the T6x are finally providing the
bridge to modern SATA storage devices, while also enabling usage of
standard SSD drives, thus getting rid of the main speed bottleneck of
computing up until then. Of course, the departure from single core CPU's
and the addition of virtualization features also helps a lot.

Unfortunately, while the T60 still provided IPS display options for
their 4:3/15" variants, they were still limited to a hard limit of 3GB
of RAM. Its successor T61 finally made the options of faster CPU's and
using up to 8GB RAM possible, but the superior display options of the
4:3/15" T60 models were left behind in the dust.

Entering the Frankenpad: A community of talented hardware hackers found
out that the more capable T61 4:3/14.1" mainboard was compatible enough
to be refitted into the T60 4:3/15" shell hosting the much better IPS or
Flexview displays.

In addition, somebody also discovered the existence of LED backlit UXGA
IPS displays made by manufacturer Boe Hydis mainly for medical devices,
but which could also be used in those Frankenpads after modding the
display cable and inverter board. That resulted into much less power
consumption by the display while significantly raising the much lamented
display brightness by great extent. It is a pity though, that these
displays are now almost impossible to get hold of.

For me, the most balanced Thinkpad generation never build by Lenovo is
the T60/T61 hybdrid Frankenpad. Fulfilling my very own dream of the
perfect Thinkpad, over the years i build a few of these for my own usage
pleasure. And up until now, thanks to an SSD in combiation with a
comparatively fast Core2Duo Penryn CPU and the aforementioned LED
backlit UXGA IPS display, personally i don't feel the need to look
forward for one of the newer Thinkpad models by Lenovo.

I am currently intending to sell one of my freshly assmbled Frankenpads
featuring the above described characteristics. As i would much prefer to
see this machine being purchased by someone really appreciating its
uniqueness, i don't really want to put it up on feeBay. So if you know
someone searching for such a gem, here is a pointer:

http://forum.thinkpads.com/viewtopic.php?f=11&t=117049

I am not sure if i will ever be able to assemble one of these again, as
it has become increasingly harder to find appropriate components. So
this might easily be one of the last possibilities to get hold of such a
machine.

Regards,
Paul
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

green-9
Paul Seelig wrote at 2015-03-06 16:24 -0600:
> While the T23 was a really nice machine back in its days which even
> remained useful for a long time afterwards, in my not so humble opinion,
> the sweet spot for a well made Thinkpad is the T60/T61 generation.

Though I do not have a long history with ThinkPads, I really like the
T61 model. I feel that it still provides everything I need, with the
exception of display brightness. Otherwise, the 4:3 SXGA+ display has
a nice pixel density and aspect ratio.

> Entering the Frankenpad: A community of talented hardware hackers found
> out that the more capable T61 4:3/14.1" mainboard was compatible enough
> to be refitted into the T60 4:3/15" shell hosting the much better IPS or
> Flexview displays.

I wish it were possible to use a 14.1 inch shell instead.
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

cristian bono
i still use lenovo x61 table
with windows 7 not bad

> On Mar 6, 2015, at 22:04, "green" <[hidden email]> wrote:
>
> Paul Seelig wrote at 2015-03-06 16:24 -0600:
>> While the T23 was a really nice machine back in its days which even
>> remained useful for a long time afterwards, in my not so humble opinion,
>> the sweet spot for a well made Thinkpad is the T60/T61 generation.
>
> Though I do not have a long history with ThinkPads, I really like the
> T61 model. I feel that it still provides everything I need, with the
> exception of display brightness. Otherwise, the 4:3 SXGA+ display has
> a nice pixel density and aspect ratio.
>
>> Entering the Frankenpad: A community of talented hardware hackers found
>> out that the more capable T61 4:3/14.1" mainboard was compatible enough
>> to be refitted into the T60 4:3/15" shell hosting the much better IPS or
>> Flexview displays.
>
> I wish it were possible to use a 14.1 inch shell instead.
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

Matt Jenny
I have a 14.1" standard screen T61p with a UXGA panel, a Sharp LQ141U1LH02, it has to be modified to work, need to disconnect pin 2 on the LVDS-30 connector on the panel. It is not a very good panel, dim and has a bad case of most of the problems that are associated with TFT panels. I do like it though, good pixel density, just wish it was using a better technology.

On Fri, Mar 6, 2015 at 10:58 PM, cristian bono <[hidden email]> wrote:
i still use lenovo x61 table
with windows 7 not bad

> On Mar 6, 2015, at 22:04, "green" <[hidden email]> wrote:
>
> Paul Seelig wrote at 2015-03-06 16:24 -0600:
>> While the T23 was a really nice machine back in its days which even
>> remained useful for a long time afterwards, in my not so humble opinion,
>> the sweet spot for a well made Thinkpad is the T60/T61 generation.
>
> Though I do not have a long history with ThinkPads, I really like the
> T61 model. I feel that it still provides everything I need, with the
> exception of display brightness. Otherwise, the 4:3 SXGA+ display has
> a nice pixel density and aspect ratio.
>
>> Entering the Frankenpad: A community of talented hardware hackers found
>> out that the more capable T61 4:3/14.1" mainboard was compatible enough
>> to be refitted into the T60 4:3/15" shell hosting the much better IPS or
>> Flexview displays.
>
> I wish it were possible to use a 14.1 inch shell instead.
> --
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
--
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

Paul Seelig-3
In reply to this post by green-9
On 03/07/2015 04:03 AM, green wrote:
> I wish it were possible to use a 14.1 inch shell instead.
>
Unfortunately, there are no IPS/Flexview nor LED backlit displays of
that size. For an LED backlight, the only option is to manually replace
the CCFL with an aftermarket LED kit. Lots of people are already doing
exactly this.

If you search for this topic on the usual thinkpad forum sites you will
find lots of results. I didn't dare trying myself yet, as this seems to
be no straighforward modification with mixed results.
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

green-9
In reply to this post by Matt Jenny
Matt Jenny wrote at 2015-03-06 22:27 -0600:
> I have a 14.1" standard screen T61p with a UXGA panel, a Sharp
> LQ141U1LH02, it has to be modified to work, need to disconnect pin 2
> on the LVDS-30 connector on the panel. It is not a very good panel,
> dim and has a bad case of most of the problems that are associated
> with TFT panels. I do like it though, good pixel density, just wish
> it was using a better technology.

If SXGA+ is nice, then UXGA is even better, especially in 14.1 inch
size (SXGA+ is 124 pixels/inch, UXGA is 142 pixels/inch). But if I can
barely see the display anyway because it is so dim, then it does not
really matter.
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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

green-9
In reply to this post by Paul Seelig-3
Paul Seelig wrote at 2015-03-07 07:04 -0600:

> On 03/07/2015 04:03 AM, green wrote:
> > I wish it were possible to use a 14.1 inch shell instead.
> >
> Unfortunately, there are no IPS/Flexview nor LED backlit displays of
> that size. For an LED backlight, the only option is to manually replace
> the CCFL with an aftermarket LED kit. Lots of people are already doing
> exactly this.
>
> If you search for this topic on the usual thinkpad forum sites you will
> find lots of results. I didn't dare trying myself yet, as this seems to
> be no straighforward modification with mixed results.
I would like to try it too, but I also am concerned about the
results. Have you seen this excellent resource?

https://people.xiph.org/~xiphmont/thinkpad/led-backlight.shtml

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Re: Well-Made Computers (Was: Repairing Thinkpad chargers)

Matt Jenny
It is kinda dim, do not have a way to test it, it is not daylight readable and good fluorescent lighting will make it hard to see.

On Sat, Mar 7, 2015 at 7:24 PM, green <[hidden email]> wrote:
Paul Seelig wrote at 2015-03-07 07:04 -0600:
> On 03/07/2015 04:03 AM, green wrote:
> > I wish it were possible to use a 14.1 inch shell instead.
> >
> Unfortunately, there are no IPS/Flexview nor LED backlit displays of
> that size. For an LED backlight, the only option is to manually replace
> the CCFL with an aftermarket LED kit. Lots of people are already doing
> exactly this.
>
> If you search for this topic on the usual thinkpad forum sites you will
> find lots of results. I didn't dare trying myself yet, as this seems to
> be no straighforward modification with mixed results.

I would like to try it too, but I also am concerned about the
results. Have you seen this excellent resource?

https://people.xiph.org/~xiphmont/thinkpad/led-backlight.shtml

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