Zebra Strip Contact Reliability

[Nelson]

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

--
Nelson

 

[Meat Plow]

On Mon, 13 Oct 2008 17:42:02 -0400, Nelson <nelson@nowhere.com>wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned a Fluke
77 display that worked for 20 years that developed a segment that had
less contrast than the others.

 

[Andrew Erickson]

In article <0001HW.C51938EA000812AAF0407648@news.astraweb.com>,
Nelson <nelson@nowhere.com> wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

I have no personal experience with using them, but one of the 3M
"Electrically Conductive Adhesive Transfer Tapes" might be just the
ticket here. There are several variations available, differing in
adhesives and other properties, but something like #9705 or #9706 sounds
as though it may be appropriate and reasonably easy to work with in the
usual repair shop conditions (e.g. not requiring baking or high
pressures to bond).

These are double-stick tapes that conduct in the Z axis (through the
tape) but insulate in the X and Y axes. Really cool sounding, but
possibly rather spendy; I haven't checked prices or availability. They
also have some similar tapes that are "XYZ Isotropic" and conduct in all
directions.

I've no idea if other companies offer similar products.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he cannot
lose." -- Jim Elliot

 

[Samuel M. Goldwasser]

Meat Plow <meat@petitmorte.net> writes:

On Mon, 13 Oct 2008 17:42:02 -0400, Nelson <nelson@nowhere.com>wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned a Fluke
77 display that worked for 20 years that developed a segment that had
less contrast than the others.

Sometimes, figuring a way to very slightly increase the compressive
force will help in a marginal situation.

--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

 

[PanHandler]

"Samuel M. Goldwasser" <sam@seas.upenn.edu> wrote in message
news:8wss83bd.fsf@seas.upenn.edu...

Meat Plow <meat@petitmorte.net> writes:

On Mon, 13 Oct 2008 17:42:02 -0400, Nelson <nelson@nowhere.com>wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned a Fluke
77 display that worked for 20 years that developed a segment that had
less contrast than the others.

Sometimes, figuring a way to very slightly increase the compressive
force will help in a marginal situation.

How 'bout an appropriately sized length of shrink wrap?

 

[PanHandler]

How 'bout an appropriately sized length of shrink wrap?

Meant heat shrink tubing.

 

[DaveM]

"Andrew Erickson" <gmavt@drewe.reverse2mail.net> wrote in message
news:gmavt-AD1477.18241813102008@sn-ip.vsrv-sjc.supernews.net...

In article <0001HW.C51938EA000812AAF0407648@news.astraweb.com>,
Nelson <nelson@nowhere.com> wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

I have no personal experience with using them, but one of the 3M
"Electrically Conductive Adhesive Transfer Tapes" might be just the
ticket here. There are several variations available, differing in
adhesives and other properties, but something like #9705 or #9706 sounds
as though it may be appropriate and reasonably easy to work with in the
usual repair shop conditions (e.g. not requiring baking or high
pressures to bond).

These are double-stick tapes that conduct in the Z axis (through the
tape) but insulate in the X and Y axes. Really cool sounding, but
possibly rather spendy; I haven't checked prices or availability. They
also have some similar tapes that are "XYZ Isotropic" and conduct in all
directions.

I've no idea if other companies offer similar products.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he cannot
lose." -- Jim Elliot

 

[DaveM]

"Andrew Erickson" <gmavt@drewe.reverse2mail.net> wrote in message
news:gmavt-AD1477.18241813102008@sn-ip.vsrv-sjc.supernews.net...

In article <0001HW.C51938EA000812AAF0407648@news.astraweb.com>,
Nelson <nelson@nowhere.com> wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

I have no personal experience with using them, but one of the 3M
"Electrically Conductive Adhesive Transfer Tapes" might be just the
ticket here. There are several variations available, differing in
adhesives and other properties, but something like #9705 or #9706 sounds
as though it may be appropriate and reasonably easy to work with in the
usual repair shop conditions (e.g. not requiring baking or high
pressures to bond).

These are double-stick tapes that conduct in the Z axis (through the
tape) but insulate in the X and Y axes. Really cool sounding, but
possibly rather spendy; I haven't checked prices or availability. They
also have some similar tapes that are "XYZ Isotropic" and conduct in all
directions.

I've no idea if other companies offer similar products.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he cannot
lose." -- Jim Elliot

Nooo... you don't want anything that is electrically conductive contacting
either the Zebra strip or the display or the PCB. To do so would short the
individual conductive segments, which must remain isolated from each other!!!!
I've no experience with the double-stick tapes mentioned above, but it's hard to
envision that as a solution to this problem. Might work, but I'd need it
proven to me before I could recommend it.
As was previously suggested, the only repair for this problem is cleanliness
and, if necessary, more pressure.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Life is like a roll of toilet paper; the closer it gets to the end, the faster
it goes.

 

[William Sommerwerck]

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone knew of a
safe way to clean the zebra contacts. (The very first cleaning needed in
nearly 20 years occurred four or five months ago.)

 

[Meat Plow]

On 13 Oct 2008 19:48:06 -0400, sam@seas.upenn.edu (Samuel M.
Goldwasser)wrote:

Meat Plow <meat@petitmorte.net> writes:

On Mon, 13 Oct 2008 17:42:02 -0400, Nelson <nelson@nowhere.com>wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned a Fluke
77 display that worked for 20 years that developed a segment that had
less contrast than the others.

Sometimes, figuring a way to very slightly increase the compressive
force will help in a marginal situation.

I was going to mention that but it can be a difficult to do and could
actually do some damage if your not careful. I recall doing just that
on a Yaesu ham radio moblie display that would lose segments from
vibration. I purchased a replacement and sold the radio. I later found
that this was a common problem for that particular unit and
Yaesu/Vertex Standard had corrected it in their replacement display.

 

[hr(bob) hofmann@att.net]

On Oct 13, 7:43 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone knew of a
safe way to clean the zebra contacts. (The very first cleaning needed in
nearly 20 years occurred four or five months ago.)

Any chance of coating the stripes with the conductive paint used for
automobile window heater strips. That would provide a new conductive
surface, and would be a bit thicker so that there would/should be more
pressure on the contact point.

Bob Hofmann

 

[Old Tech]

"DaveM" <masondg4499@comcast99.net> wrote in message
news:q-idnWtDDuRoem7VnZ2dnUVZ_gmdnZ2d@comcast.com...

"Andrew Erickson" <gmavt@drewe.reverse2mail.net> wrote in message
news:gmavt-AD1477.18241813102008@sn-ip.vsrv-sjc.supernews.net...
In article <0001HW.C51938EA000812AAF0407648@news.astraweb.com>,
Nelson <nelson@nowhere.com> wrote:

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to
rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable
to
find anything with google.

Does anyone have any experience or recommendations regarding this?

I have no personal experience with using them, but one of the 3M
"Electrically Conductive Adhesive Transfer Tapes" might be just the
ticket here. There are several variations available, differing in
adhesives and other properties, but something like #9705 or #9706
sounds
as though it may be appropriate and reasonably easy to work with in
the
usual repair shop conditions (e.g. not requiring baking or high
pressures to bond).

These are double-stick tapes that conduct in the Z axis (through
the
tape) but insulate in the X and Y axes. Really cool sounding, but
possibly rather spendy; I haven't checked prices or availability.
They
also have some similar tapes that are "XYZ Isotropic" and conduct
in all
directions.

I've no idea if other companies offer similar products.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he
cannot
lose." -- Jim Elliot

Nooo... you don't want anything that is electrically conductive
contacting either the Zebra strip or the display or the PCB. To do
so would short the individual conductive segments, which must remain
isolated from each other!!!! I've no experience with the
double-stick tapes mentioned above, but it's hard to envision that
as a solution to this problem. Might work, but I'd need it proven
to me before I could recommend it.
As was previously suggested, the only repair for this problem is
cleanliness and, if necessary, more pressure.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate
characters in the address)

Life is like a roll of toilet paper; the closer it gets to the end,
the faster it goes.

I have this problem on a car radio LCD display, when I get round to it

I am going to try something that we used to do on old TV turret
tuners - the contacts were silver plated and needed cleaning fairly
regularly. However, if after cleaning a VERY thin smear of vaseline
was applied to the contacts it was rare to have to clean them again.
You may think that the vaseline would insulate rather than improve
contact, but the light pressure of the leaf contact was enough to push
the vaseline aside. Vaseline is self healing so prevents oxidation. I
have used it successfully in remote control handset contacts, pots in
guitars and amps and even the home telephone. I would stress that the
smear of vaseline we are talking about here is just that - a very
light smear so as to almost be invisible. Wether or not it will work
on non-moving contacts remains to be seen.

Roy the Old Tech

 

[N Cook]

Nelson <nelson@nowhere.com> wrote in message
news:0001HW.C51938EA000812AAF0407648@news.astraweb.com...

I have head several devices over the years with LCDs that were
connected with Zebra strips and which subsequently
developed display problems due to the Zebra strip developing poor
contact with the PCB. Not surprising since the contact seems to rely
only on pressure. Cleaning the surfaces, eg with alcohol, and
reseating the strip helps for a while but the intermittent display
always seems to return.

Surely there must be some "connective glue" or other technique to
repair these things more permanently although I have been unable to
find anything with google.

Does anyone have any experience or recommendations regarding this?

--
Nelson

Single zebra strip has 4 possible re-orientations , 2 strips have 32
orientations/swaps. That plus cleaning (i use methylated spirit) is usually
all thats needed. Failing that, a pair of small strips of soft plastic
against the viewing face of LCD to compress a bit more.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

 

[N Cook]

hr(bob) hofmann@att.net <hrhofmann@att.net> wrote in message
news:cd9b176d-b9f3-4a32-847a-48459ee34e3e@d70g2000hsc.googlegroups.com...
On Oct 13, 7:43 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone knew of a
safe way to clean the zebra contacts. (The very first cleaning needed in
nearly 20 years occurred four or five months ago.)

Any chance of coating the stripes with the conductive paint used for
automobile window heater strips. That would provide a new conductive
surface, and would be a bit thicker so that there would/should be more
pressure on the contact point.

Bob Hofmann


precisely wrong advice, we are talking about zebra strip here, the point of
it is exact alignment, between pcb pads and LCD lands, is not required

I wonder who dreamt up the concept ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

 

[N Cook]

N Cook <diverse8@gazeta.pl> wrote in message
news:gd1iqu$8q9$1@inews.gazeta.pl...

hr(bob) hofmann@att.net <hrhofmann@att.net> wrote in message
news:cd9b176d-b9f3-4a32-847a-48459ee34e3e@d70g2000hsc.googlegroups.com...
On Oct 13, 7:43 pm, "William Sommerwerck" <grizzledgee...@comcast.net
wrote:
No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone knew of
a
safe way to clean the zebra contacts. (The very first cleaning needed in
nearly 20 years occurred four or five months ago.)

Any chance of coating the stripes with the conductive paint used for
automobile window heater strips. That would provide a new conductive
surface, and would be a bit thicker so that there would/should be more
pressure on the contact point.

Bob Hofmann


precisely wrong advice, we are talking about zebra strip here, the point
of
it is exact alignment, between pcb pads and LCD lands, is not required

I wonder who dreamt up the concept ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

afterthought , I suppose you meant conductive paint added to the pcb pads
(stripes), not the zebra (stripes)

 

[William Sommerwerck]

I have this problem on a car radio LCD display, when I get round to it
I am going to try something that we used to do on old TV turret
tuners -- the contacts were silver plated and needed cleaning fairly
regularly. However, if after cleaning a VERY thin smear of Vaseline
was applied to the contacts it was rare to have to clean them again.
You may think that the Vaseline would insulate rather than improve
contact, but the light pressure of the leaf contact was enough to push
the Vaseline aside. Vaseline is self healing so prevents oxidation. I
have used it successfully in remote control handset contacts, pots in
guitars and amps and even the home telephone. I would stress that the
smear of Vaseline we are talking about here is just that -- a very
light smear so as to almost be invisible. Whether or not it will work
on non-moving contacts remains to be seen.

A shmeer, eh?

Vaseline isn't very conductive. Without any wiping action, it's likely
simply to plug up the works on non-moving contacts.

 

[Jim Yanik]

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in
news:Gp6dnTyJE7oNdm7VnZ2dnUVZ_vSdnZ2d@comcast.com:

No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone knew of a
safe way to clean the zebra contacts. (The very first cleaning needed in
nearly 20 years occurred four or five months ago.)

I wonder if Deoxit or cramolin would help?

--
Jim Yanik
jyanik
at
kua.net

 

[Jim Yanik]

"N Cook" <diverse8@gazeta.pl> wrote in
news:gd1j07$9ea$1@inews.gazeta.pl:

N Cook <diverse8@gazeta.pl> wrote in message
news:gd1iqu$8q9$1@inews.gazeta.pl...
hr(bob) hofmann@att.net <hrhofmann@att.net> wrote in message
news:cd9b176d-b9f3-4a32-847a-48459ee34e3e@d70g2000hsc.googlegroups.com
... On Oct 13, 7:43 pm, "William Sommerwerck"
grizzledgee...@comcast.net> wrote:
No solution other than to repeat cleaning that I know. Some
configurations are more susceptible. I just recently cleaned
a Fluke 77 display that worked for 20 years that developed
a segment that had less contrast than the others.

I cleaned my Fluke for the second time, scrubbing the PCB contacts
thoroughly with alcohol. I was about to ask the group if anyone
knew of
a
safe way to clean the zebra contacts. (The very first cleaning
needed in nearly 20 years occurred four or five months ago.)

Any chance of coating the stripes with the conductive paint used for
automobile window heater strips. That would provide a new conductive
surface, and would be a bit thicker so that there would/should be
more pressure on the contact point.

Bob Hofmann


precisely wrong advice, we are talking about zebra strip here, the
point
of
it is exact alignment, between pcb pads and LCD lands, is not
required

I wonder who dreamt up the concept ?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/






afterthought , I suppose you meant conductive paint added to the pcb
pads (stripes), not the zebra (stripes)

why not use gold leaf on the PCB pads,build up thickness(increasing
contact pressure)?
conductive paint will be soft and contact pressure will force it aside and
possibly short out adjoining pads.

--
Jim Yanik
jyanik
at
kua.net

 

[Andrew Erickson]

In article <q-idnWtDDuRoem7VnZ2dnUVZ_gmdnZ2d@comcast.com>,
"DaveM" <masondg4499@comcast99.net> wrote:

"Andrew Erickson" <gmavt@drewe.reverse2mail.net> wrote in message
news:gmavt-AD1477.18241813102008@sn-ip.vsrv-sjc.supernews.net...
I have no personal experience with using them, but one of the 3M
"Electrically Conductive Adhesive Transfer Tapes" might be just the
ticket here. There are several variations available, differing in
adhesives and other properties, but something like #9705 or #9706 sounds
as though it may be appropriate and reasonably easy to work with in the
usual repair shop conditions (e.g. not requiring baking or high
pressures to bond).

These are double-stick tapes that conduct in the Z axis (through the
tape) but insulate in the X and Y axes. Really cool sounding, but
possibly rather spendy; I haven't checked prices or availability. They
also have some similar tapes that are "XYZ Isotropic" and conduct in all
directions.

I've no idea if other companies offer similar products.

Nooo... you don't want anything that is electrically conductive contacting
either the Zebra strip or the display or the PCB. To do so would short the
individual conductive segments, which must remain isolated from each
other!!!!
I've no experience with the double-stick tapes mentioned above, but it's hard
to
envision that as a solution to this problem. Might work, but I'd need it
proven to me before I could recommend it.
As was previously suggested, the only repair for this problem is cleanliness
and, if necessary, more pressure.

Maybe I wasn't clear enough in my explanation, but these tapes are only
conductive unidirectionally, rather like a zebra strip actually. They
insulate across the X and Y axes, but conduct through the Z axis, so
adjacent pads (assuming they appropriate separation, etc.) are still
insulated from each other.

The "XYZ Isotropic" tapes are different and obviously unsuitable for the
application, since they don't insulate; however, the others should work
to some degree, at least in theory.

--
Andrew Erickson

"He is no fool who gives what he cannot keep to gain that which he cannot
lose." -- Jim Elliot

 

[Michael A. Terrell]

Old Tech wrote:

I have this problem on a car radio LCD display, when I get round to it
I am going to try something that we used to do on old TV turret
tuners - the contacts were silver plated and needed cleaning fairly
regularly. However, if after cleaning a VERY thin smear of vaseline
was applied to the contacts it was rare to have to clean them again.
You may think that the vaseline would insulate rather than improve
contact, but the light pressure of the leaf contact was enough to push
the vaseline aside. Vaseline is self healing so prevents oxidation. I
have used it successfully in remote control handset contacts, pots in
guitars and amps and even the home telephone. I would stress that the
smear of vaseline we are talking about here is just that - a very
light smear so as to almost be invisible. Wether or not it will work
on non-moving contacts remains to be seen.

Roy the Old Tech

Great idea. Then you can buy a new radio.


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