Anyone here with iPod repair experience?

Taking this thing (iPod Touch, 2nd version) apart was a separate long story
but it turned out that putting it back together is yet another challenge.
Needed to replace a faulty battery. For that the glass touch screen, the LCD
and the metal bracket had to come off. The darn thing had all parts glued
together with thin layer of what looks like non-drying silicon goo. Mr. Jobs
*REALLY* didn't want me to repair his products, I gather. As if I needed
another reminder never to buy Apple devices... But I digress.

Took some gentle prying of the parts apart and praying that LCD won't crack
while I was doing that. So, I soldered the new battery, put all parts back in
the reverse order and - bingo! Everything came back to life except for one
thing: the colors on the display are now inverted. What gives? The LCD module
seems to be a self-contained digital display with serial communication through
its connector (way too few contacts for anything else) - so if I put it back
wrong or if it's a bad connection, you would think the whole display won't
work. Needless to say, I re-connected the ribbon cable several times to no
avail.

Does anyone have and idea of what hardware issue associated with
disconnecting/reconnecting the LCD module can lead to inverted colors?


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On 31/07/2013 05:18, passerby wrote:
Anyone here with iPod repair experience?
Taking this thing (iPod Touch, 2nd version) apart was a separate long story
but it turned out that putting it back together is yet another challenge.
Needed to replace a faulty battery. For that the glass touch screen, the
LCD
and the metal bracket had to come off. The darn thing had all parts glued
together with thin layer of what looks like non-drying silicon goo. Mr.
Jobs
*REALLY* didn't want me to repair his products, I gather. As if I needed
another reminder never to buy Apple devices... But I digress.

Took some gentle prying of the parts apart and praying that LCD won't crack
while I was doing that. So, I soldered the new battery, put all parts
back in
the reverse order and - bingo! Everything came back to life except for one
thing: the colors on the display are now inverted. What gives? The LCD
module
seems to be a self-contained digital display with serial communication
through
its connector (way too few contacts for anything else) - so if I put it
back
wrong or if it's a bad connection, you would think the whole display won't
work. Needless to say, I re-connected the ribbon cable several times to no
avail.
Does anyone have and idea of what hardware issue associated with
disconnecting/reconnecting the LCD module can lead to inverted colors?


Could there have been a settings change to a hard-of-seeing option ?

passerby udtrykte præcist:

Everything came back to life except for one
thing: the colors on the display are now inverted. What gives?

Does anyone have and idea of what hardware issue associated with
disconnecting/reconnecting the LCD module can lead to inverted colors?

Could it be a reversed polarizing filter in front of the screen? Or
perhaps I am totally confusing technologies...

Leif

--
Husk kørelys bagpå, hvis din bilfabrikant har taget den idiotiske
beslutning at undlade det.

responding to
http://www.electrondepot.com/repair/...pa-147623-.htm
, passerby wrote:
leif wrote:

Could it be a reversed polarizing filter in front of the screen? Or
perhaps I am totally confusing technologies...

Leif



Thank you for your replies, guys! I did think about a polarized filter of
sorts because it does in fact look like a polarized filter got reversed! But
there's only one orientation of the glass that it can possibly go back to and
the mylar backing (never heard of polarized backing, but who knows) stayed on
the LCD all the time, 'cause it was glued. In other words, if anything is
polarized, it went right back to the original orientation, so should not have
caused any issue.


I looked around for a different color scheme (better visibility option) - but
could not locate any. Sorry, not a big iPod user - it's my son's device. If
there's such a software option that can reverse colors, please advise.



--

On 7/31/2013 11:23 AM, passerby wrote:
responding to
http://www.electrondepot.com/repair/...pa-147623-.htm

, passerby wrote:
leif wrote:

Could it be a reversed polarizing filter in front of the screen? Or
perhaps I am totally confusing technologies...
Leif


Thank you for your replies, guys! I did think about a polarized filter of
sorts because it does in fact look like a polarized filter got reversed!
But
there's only one orientation of the glass that it can possibly go back
to and
the mylar backing (never heard of polarized backing, but who knows)
stayed on
the LCD all the time, 'cause it was glued. In other words, if anything is
polarized, it went right back to the original orientation, so should not
have
caused any issue.


I looked around for a different color scheme (better visibility option)
- but
could not locate any. Sorry, not a big iPod user - it's my son's device. If
there's such a software option that can reverse colors, please advise.



What exactly do you mean by "reversed colors"? You need a color pallet
for the device to know how the colors relate. Problem could be just a
single connection to the display that is not making contact.

Paul

responding to
http://www.electrondepot.com/repair/...pa-147623-.htm
, passerby wrote:
pdrahn wrote:

What exactly do you mean by "reversed colors"? You need a
color pallet
for the device to know how the colors relate. Problem could be just a
single connection to the display that is not making contact.


"Inverted" was the best I could describe it. For example, when the iPod
starts, there should be a white apple on black background. It's now black
apple on white. I can kind of sort of see the menus but they look washed out
(although black text is still black, which is weird). Sometimes it might look
like one of the colors (most likely green) is missing, but then on some
screens you would see a bit of green anyway (for example, the battery icon is
green or yellow green anyway). All the icons are in wrong/odd colors


If this was a VGA display and it was behaving like that, I would have thought
a single connection is missing, too. V and H are fine - all shapes are
correct, I definitely see blue and red. Green looks weird or missing, so I
would go search for a problem with the G connection. But this is a digital LCD
display, I don't believe it's controlled by the same principal. So, if the
connector was off, the whole thing would probably be dark or at least look
seriously messed up.


--

If this was a VGA display and it was behaving like that, I would have thought
a single connection is missing, too. V and H are fine - all shapes are
correct, I definitely see blue and red. Green looks weird or missing, so I
would go search for a problem with the G connection. But this is a digital LCD
display, I don't believe it's controlled by the same principal. So, if the
connector was off, the whole thing would probably be dark or at least look
seriously messed up.

Some LCD panels are connected to their drive circuitry via a "zebra
connector"... a strip of an elastomer which has alternating layers or
slices of conductive and insulating material. Typically these are
held against the LCD and mother circuit boards by pressure.

I believe that a color LCD is likely to have a repeated pattern of row
or column driver contacts. If such an LCD was slightly misaligned
when it was fastened down and pressed against the zebra connector,
it's entirely possible that this would result in a "shift" in the
driver connections, one or two rows or columns to one side. If the
pattern happened to be (e.g.) RGBRGBRGB, then you might end up driving
the signals to the (e.g.) GBRGBRGBR columns or rows instead. In other
words, the physical misalignment would "rotate" the color through one
third of the colorspace... and this could be the "inverted" effect
you've been seeing.

Another type of misalignment or bending of a zebra connection might
result in two of the three colors being OK, and the other one being
wrong, I suppose.

I dislike these devices as well but have tackled a few for family members.
I had a similar experience after replacing the battery - display had
miscolored moire effect.
Replugging, jiggling did nothing.
Ordering a new LCD screen fixed the issue.
Frustrating as I never determined cause. I know I failed to power down
before disassembly so my best guess was that plugging/unplugging while
powered up might have caused the problem.

"passerby" m wrote in
message oups.com...
Anyone here with iPod repair experience?
Taking this thing (iPod Touch, 2nd version) apart was a separate long
story
but it turned out that putting it back together is yet another challenge.
Needed to replace a faulty battery. For that the glass touch screen, the
LCD
and the metal bracket had to come off. The darn thing had all parts glued
together with thin layer of what looks like non-drying silicon goo. Mr.
Jobs
*REALLY* didn't want me to repair his products, I gather. As if I needed
another reminder never to buy Apple devices... But I digress.

Took some gentle prying of the parts apart and praying that LCD won't
crack
while I was doing that. So, I soldered the new battery, put all parts back
in
the reverse order and - bingo! Everything came back to life except for one
thing: the colors on the display are now inverted. What gives? The LCD
module
seems to be a self-contained digital display with serial communication
through
its connector (way too few contacts for anything else) - so if I put it
back
wrong or if it's a bad connection, you would think the whole display won't
work. Needless to say, I re-connected the ribbon cable several times to no
avail.
Does anyone have and idea of what hardware issue associated with
disconnecting/reconnecting the LCD module can lead to inverted colors?

--


--
+--------------[ SERVER SIGNATURE ]--------+
| posted via http://www.electrondepot.com |
| Web, RSS and Social Media Interface to |
| sci.electronics.repair and other groups |
+------------------------------------------+

"passerby" m wrote in
message oups.com...
Anyone here with iPod repair experience?
Taking this thing (iPod Touch, 2nd version) apart was a separate long
story
but it turned out that putting it back together is yet another challenge.
Needed to replace a faulty battery. For that the glass touch screen, the
LCD
and the metal bracket had to come off. The darn thing had all parts glued
together with thin layer of what looks like non-drying silicon goo. Mr.
Jobs
*REALLY* didn't want me to repair his products, I gather. As if I needed
another reminder never to buy Apple devices... But I digress.

Took some gentle prying of the parts apart and praying that LCD won't
crack
while I was doing that. So, I soldered the new battery, put all parts back
in
the reverse order and - bingo! Everything came back to life except for one
thing: the colors on the display are now inverted. What gives? The LCD
module
seems to be a self-contained digital display with serial communication
through
its connector (way too few contacts for anything else) - so if I put it
back
wrong or if it's a bad connection, you would think the whole display won't
work. Needless to say, I re-connected the ribbon cable several times to no
avail.
Does anyone have and idea of what hardware issue associated with
disconnecting/reconnecting the LCD module can lead to inverted colors?



I've replaced batteries and screens on a few Touch 2Gs for family members
and friends, and not had any such issue as you are suffering. About the only
thing that I would say is that those little connectors on the ribbons are
extremely difficult to refit correctly. I have had issues where they seem to
be solidly connected, but aren't. Considering their size, and how easily
they seem to come apart when you want them to, they take an extreme amount
of force to re-seat correctly. When they go back correctly, they have made a
very positive 'click' on the ones that I have done. The amount of force
required has made it feel like you are going to do damage to either the
connector or the board, but I never have done.

Otherwise, perhaps the software has become screwed as a result of having the
battery off. Have you tried a full power down reset, or a restore operation,
or reload / upgrade of the operating system ?

Ah, take a look here. This could be your problem ...

https://discussions.apple.com/thread...art=0&tstart=0

Arfa