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'[OT]: Good (any) resource for LCD datasheets?'
2001\06\29@055736 by Kevin Olalde

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I've got an LCD recently pulled from a defunct office phone.

A sticker on the back reads:
UC24202
GNAR4PA
000717

Samsung is printed on left side of the board and 2154A is printed on the right.
There's two chips, but they're covered with a black substance (on PCB
packaging?).
With a 14 pin ribbon connector.

From web searching I *think* this may be similar to a Sieko L246200J000, but I'm
just guessing?

Anyone know where I can find a datasheet?

Thanks for any help,
Kevin

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2001\06\29@062242 by Jinx

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> I've got an LCD recently pulled from a defunct office phone.

Can you tell how many lines/chars it is ? 16 x 1 ? If so, probably
a 44780 + 44100 combo, in which case the pin-out for the cable
is pretty standard. You may be able to trace the 0V line to the
PCB (sometimes it's marked on the PCB) for a clue or get the
black stuff off the chips to be really sure

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2001\06\29@063736 by Kevin Olalde

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I've never seen it operate, but by looking I'd guess 24x2 (maybe coincides with
the 24202 in the sticker?).

So scraping this black stuff off won't damage the chips?

Thanks,
Kevin

Jinx wrote:
{Quote hidden}

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2001\06\29@064956 by Jinx

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> I've never seen it operate, but by looking I'd guess 24x2 (maybe
> coincides with the 24202 in the sticker?)

24x2 sounds a bit much for just 2 chips. IF they are a 44780/4410
type pair you'd expect each to handle 16 chars at most. By looking
across the display in the right light you should be able to make out
how many chars it is
>
> So scraping this black stuff off won't damage the chips?

Are they actually SMT chips ? About an 80 pin FP80 or FP80A ?
I don't want to put you wrong if these are encapsulated (ie a die
under a blob), tampering with which will cause damage if you
try to get at them. Unless they really are ICs in the conventional
sense, I wouldn't attempt to uncover them - there won't be info
to read anyway. So, if they are encapsulations, that leaves you
with identifying any connections, comparing it to a typical 14-pin
header and taking your chances, which should be pretty good

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2001\06\29@071303 by Richard Clemens

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More important is the chip number.  My guess is you will need to interface
with the chip and not the panel.

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2001\06\29@111419 by Bob Barr

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Jinx wrote:

>
> > I've got an LCD recently pulled from a defunct office phone.
>
>Can you tell how many lines/chars it is ? 16 x 1 ? If so, probably
>a 44780 + 44100 combo, in which case the pin-out for the cable
>is pretty standard. You may be able to trace the 0V line to the
>PCB (sometimes it's marked on the PCB) for a clue or get the
>black stuff off the chips to be really sure
>

Assuming that these displays were produced in large quantity, the chips may
actually be bare die wire-bonded to the PCB rather than packaged parts.

Chip-on-board (COB) assembly is pretty common in high-volume production. If
the 'black stuff' (epoxy, IIRC) is a thin lump and has a smooth profile, I'd
bet it's been done that way.


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2001\06\29@131145 by Kevin Olalde

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> 24x2 sounds a bit much for just 2 chips. IF they are a 44780/4410
> type pair you'd expect each to handle 16 chars at most. By looking
> across the display in the right light you should be able to make out
> how many chars it is

Maybe I'm getting near bi-focal age, but after a few attempts at getting the
"right light", I'm pretty sure it's 24x2.

> Are they actually SMT chips ? About an 80 pin FP80 or FP80A ?

80 pins each looks about right.  The black blobs are about .5" square, I think I
can see the outline of one of the chips in the 'blob', looks to be about 1/2 the
size of the outer black square.  This stuff certainly doesn't look like it was
ever intended to come off.

> I don't want to put you wrong if these are encapsulated (ie a die
> under a blob)

"Die under a blob", that sounds like a it.

, tampering with which will cause damage if you
> try to get at them. Unless they really are ICs in the conventional
> sense, I wouldn't attempt to uncover them - there won't be info
> to read anyway.

Yep, I'm leaving them in place.  Frankly if I needed to remove this stuff, I'd
rather just buy a new display.

> So, if they are encapsulations, that leaves you
> with identifying any connections, comparing it to a typical 14-pin
> header and taking your chances, which should be pretty good

OK

Thanks,
Kevin

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2001\06\29@133109 by Roman Black

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Kevin Olalde wrote:
>
> > 24x2 sounds a bit much for just 2 chips. IF they are a 44780/4410
> > type pair you'd expect each to handle 16 chars at most. By looking
> > across the display in the right light you should be able to make out
> > how many chars it is
>
> Maybe I'm getting near bi-focal age, but after a few attempts at getting the
> "right light", I'm pretty sure it's 24x2.


I have stripped LCD text displays from all sorts
of old equipment, phones, faxes, copiers, etc.

The usual indicator is check if it has a 12 pin
connector (or 14pins with led backlight) and if
so they usually work with the standard 44780
signal driving it. Some chipsets are not perfectly
compatable but will work ok with the 8-bit interface
on the standard 12pin connector.
-Roman

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2001\06\29@160651 by Kevin Olalde

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Thanks all.  I'll assume it's a 44780 compatible and give it a shot.

Thanks,
Kevin

Roman Black wrote:
{Quote hidden}

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