Electronics > Repair

LCD or OLED retrofit for PM6690 / FCA3000 / CNT-90 frequency counter

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Smile2016:

--- Quote from: kilobyte on November 06, 2024, 09:19:57 pm ---I don't have such a nice frequency counter but looking at the schematic the type off LCD is mostly controller less. That means it typically only has the LCD driver shift registers and an external display controller. The controller than needs to refresh it permanently like larger TFT displays with a RGB interface.

So XCK is the shiftregister clock (4-8MHZ?), LP should be the Line pulse for latching and FR is the frame mark, and EIO not sure about that. LCD Drivers could be NT7701/NT7702


But without seeing an actual image or some measurements its mostly guesswork.

--- End quote ---
That sounds like a solid hypothesis. I'll take some signal measurements and share the results.

Smile2016:
some pictures..1.

Smile2016:
some pictures..2.

Smile2016:
some pictures..3.

coromonadalix:
a 2005 era  lcd ....  dang    cant find anything on the web


the nearest i can find are 120x320 pixels     something like  COM33T3N71ZLC  ??  spi driven ...
https://www.panelook.com/COM33T3N71ZLC_Ortustech_3.3_LCM_overview_17294.html


can you measure diagonally   and or  width lenght   ...   thks


you do have some search possibilities  here :
https://www.panelook.com/modelsearch.php?op=size
https://www.panelook.com/modelsearch.php?op=resolution

320x96 pixels search give theses
https://www.panelook.com/resmodlist.php?resolutions[]=21150    all in the    +/- 4.2 to 4.9 "
some are in the 2005 era, and discontinued ....  :(

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