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--- electronic:lcd:ng87243 [2021/01/30 08:26] – tony
+++ electronic:lcd:ng87243 [2026/09/26 05:55] (current) – tony
@@ Line 2: / Line 2: @@
 ^  LCD Description  ||
 ^Model|**NG-87243-001**|
-^Manufacturer||
+^Manufacturer|Samsung?|
-^Recovered from|Nec DTR-16D-1A|
+^Recovered from|[[:electronic:equipment:phone:dtr16d|Nec DTR-16D-1A]]|
-^Board IDs||
+^Board IDs|NG-87243-001, <del>NG-84458-001</del>|
-^LCD type||
+^Alt. board IDs|A50-002005-003, MBCF24302Z04. A50-002005-002, MBC24302Z02 ((in a DTR-8D-1A))|
-^Polarizer type||
+^LCD type|positive|
-^Columns||
+^Polarizer type|reflective|
-^Rows||
+^Columns|24|
-^Char matrix||
+^Rows|3|
-^Driver IC||
+^Char matrix|5x7|
+^Driver IC|Hitachi HD44780 compatible (covered in epoxy)|
 ^Backlight|-|
-^Arduino driver||
+^Arduino driver|LiquidCrystal_24x3.h((this is a standard HD44780 library, but the row start addresses are 0x00,0x20,0x40,0x60))|
-^Connector||
+^Connector|PCB flex cable|
 ^Num Pins|16|
 ^Pin spacing|0.05"|
-^Module size|mm|
+^Module size|98 x 37 mm|
-^  Connector pin-out  ^^^  Arduino test rig  ||
+^ ^  Measured  ^^^^  Connector pin-out  ^^  Arduino test rig  ||
 ^Pin#^Main board^LCD board^LCD on^LCD off^IC pin^Label^Pin^colour|
-^1| |Green LED K|1.7V|
+^1| |Green LED K|1.7V|0.0V|
-^2| |LED A common|0.8V|
+^2| |LED A common|0.8V|0.0V|
-^3| |Red LED K|1.9V|
+^3| |Red LED K|1.9V|0.0V|
-^4| | |2.9V|
+^4| | |2.9V|0.1V| |RS|
-^5| | |0.4V|
+^5| | |0.4V|0.1V| |E|
-^6| |164k|0.7V|
+^6| |164k|0.7V|0.1V| |D0|
-^7| |1.4M|0.6V|
+^7| |1.4M|0.6V|0.2V| |D1|
-^8| | |0.6V|3.3V|
+^8| | |0.6V|3.3V| |D2|
-^9| | |0.3V|3.3V|
+^9| | |0.3V|3.3V| |D3|
-^10|3.45k|120k|3.3V|3.3V|
+^10|3.45k|120k|3.3V|3.3V| |Vcc|
-^11|GND|GND|0.0V|
+^11|GND|GND|0.0V|0.0V| |GND|
-^12| |100k|1/9V|
+^12| |100k|1.9V|1.7V| |Contrast|
-^13|NC|120k|3.3V|3.3V|
+^13|NC|120k|3.3V|3.3V| | |
-^14|NC|0.0V|
+^14|NC| |0.0V|0.0V|
-^15|GND|GND|0.0V|
+^15|GND|GND|0.0V|0.0V| |((hard wired on LCD board to GND, perhaps just indicates LCD module is present))|
-^16|NC|
+^16|NC| |0.0V|0.0V|
-\\
+The connector pins aren't labeled on the LCD module, I have used the numbering on the phone board.  This corresponds to viewing the LCD module from the back, with the flex connector at the top and numbering the pins 1 to 16 from left to right.
+In the phones  it seems to operate with a contrast voltage of 1.9V, but I had to supply 2.3V on my test rig, might be because supply voltage was only 3V rather than 3.3V.
+The LCD modules can be swapped out from the phones quite simply, and are interchangeable between the DTR-16D and DTR-8D, DTH series and possibly other models.  See https://www.commgear.com/Documents/LCD%20Replacement-Instructions.pdf.
+The LCD uses an adapter to plug into a socket within the phone, the socket on the phone board can be de-soldered and used as an easier way to connect to the LCD than trying to connect to the LCD's flex cable.
+The module consists of two parts folded together: a PCB with the controller electronics, connected via a wide PCB flex cable to the LCD glass.
+\\
+----
+===== Additional info =====
+The slightly modified LCD library ((this is a standard HD44780 library, but the row start addresses are 0x00,0x20,0x40,0x60)):
+  * {{:arduino:dtr16d:liquidcrystal_24x3.h}},  SPI LCD library
+  * {{:arduino:dtr16d:liquidcrystal_24x3.cpp}},  SPI LCD library
 \\
+  * {{:electronic:lcd:nec_ng-8743-lcd.pdf|LCD initialisation sequence from sigrok analysis}}
+  * {{:electronic:lcd:nec_ng-8743-startup.sr|LCD initialisation sequence in sigrok format}}((this file has an extra data glitch in it that fools sigrok into getting the nibbles aligned so the 2 nibble codes are easier to decode with the 'parallel' filter))
+\\
 ----
-===== Examples : =====
+===== Examples =====
+|{{:electronic:lcd:p1296847a.jpg?800|NG87243 front}}|
+|{{:electronic:lcd:p1296843a.jpg?800|NG87243 back}}|
+|{{:electronic:lcd:p2044565a.jpg?800|MBCF24302Z04 back}}|
+|{{electronic:lcd:p2044567a.jpg?800|MBCF24302Z04, unfolded, inside}}|
+|{{:electronic:lcd:p1296839a.jpg?800|NG87243 overview, mounted, front}}|
+|{{:electronic:lcd:p1296835a.jpg?800|NG87243 overview, mounted, back}}|
+|{{:electronic:lcd:p1296842a.jpg?800|NG87243 overview, mounted, interior}}|
+|{{:electronic:lcd:p2104631a.jpg?200|NG87243 connector top}}|{{:electronic:lcd:p2104636a.jpg?200|NG87243 connector bottom}}|
+|{{:electronic:lcd:p2104627a.jpg?200|NG87243 adapter cable end}}|{{:electronic:lcd:p2104628a.jpg?200|NG87243 adapter PCB end}}|
+|{{:electronic:lcd:p2104626a.jpg?200|NG87243 adapter top}}|{{:electronic:lcd:p2104624a.jpg?200|NG87243 adapter bottom}}|
+|{{:electronic:lcd:p2104618a.jpg?200|NG87243 cable top}}|{{:electronic:lcd:p2104621a.jpg?200|NG87243 cable bottom}}|
+/*{{:electronic:lcd:.jpg?300|NG87243 chip}}*/
+|{{:electronic:lcd:p2166960a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166961a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166955a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166956a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166957a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166958a.jpg?300|NG87243 character set}}|
+|{{:electronic:lcd:p2166959a.jpg?300|NG87243 character set}}|
+{{:electronic:lcd:p1306904a.jpg?400|NG87243 examples, 'self test'}}
-{{:electronic:lcd:p1296847a.jpg?800|NG87243 front}}
+{{:electronic:lcd:p1306908a.jpg?200|NG87243 pixel layout}}
-{{:electronic:lcd:p1296843a.jpg?800|NG87243 back}}
+/*{{:electronic:lcd:.jpg?800|NG87243 circuit}}*/
-{{:electronic:lcd:p1296839a.jpg?800|NG87243 overview with board}}
-{{:electronic:lcd:p1296835a.jpg?800|NG87243 overview with board}}
-{{:electronic:lcd:p1296842a.jpg?800|NG87243 overview with board}}
-|{{:electronic:lcd:p1296835a.jpg?300|NG87243 connector}}
-|{{:electronic:lcd:.jpg?300|NG87243 chip}}
-|{{:electronic:lcd:.jpg?300|NG87243 character set}}
-|{{:electronic:lcd:.jpg?400|NG87243 examples}}
-|{{:electronic:lcd:.jpg?200|NG87243 pixel layout}}
-|{{:electronic:lcd:.jpg?800|NG87243 circuit}}

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