Electronics > Repair
Hameg HM8118 repair
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CJay:
SED controllers likely given the Epson.c in the source tree
coromonadalix:
goood catch   haven't tought of that  lolll  should have checked more  ....
TRN:

--- Quote from: CJay on November 26, 2023, 04:39:54 pm ---
--- Quote from: coromonadalix on November 26, 2023, 02:06:53 pm ---

look like a 40x8 characters lcd for sure .... if i count them in their user manual images  ....  i dont think its a graphical one ??

--- End quote ---

I'm pretty convinced it's a graphical LCD, the third picture has an uninterrupted line of pixels down the display, character LCDs generally have 'gaps' between rows of characters.

Looking at the includes and source files in the video linked give the impression it's a graphic one too, LCDDRAW.C and LCDTEXT.C, plus the Epson.c might indicate it could an Epson (compatible?) controller?

The pictures are nearly good enough to count the pixels, I think it's almost definitely 64V just by counting but obvs counting pixels that aren't visible on the RH side makes it tricky, maybe 128H making it a  128x64 (maybe 138 which would mean custom?).

There's 2 chips mounted on the glass and the flat flex looks as though there's a bunch of vias so they're 'in parallel' for the data and probably most control lines so there'll be a 'chip select' line somewhere.

It might be useful to know the physical dimensions of the display.

****Also might be interesting to see a little more of the CPU and memory, if it's got external program memory or there have been firmware updates it might give some clues to examine the contents?****

Interesting, uses a PSD chip so it's 8052 based, firmware update is likely encrypted though :(

--- End quote ---

Good catch indeed, it is a graphics display.

The owner of the video was so friendly to send me just now a copy of the module specifications.

It is a Varitronixs COG LCM138 240 x 64 Dot graphics display which has 2 x Epson S1D10605 COG's

For who's interested I have attached copies of the spec sheet and S1D10605 data sheet.
coromonadalix:
just send them an email  if they have a substitution ??  at least a 30 pins flex  with all the signals  ...and the controllers 

yep thats what i tought   2x chipselect,1x Enable pin ...



dual S1D10605  lcd's ?

http://www.3t-lcd.com/MechanicalSpec/Graphical/TMGG24064-XX.pdf                   22 pins lcd ?

COG-BT240064-05
https://www.farnell.com/datasheets/31889.pdf   22 pins lcd ?

TMGG24064-XX
http://www.3t-lcd.com/MechanicalSpec/Graphical/TMGG24064-XX.pdf    22 pins lcd ?

the TMGG24064   is the one we get the most while searching ?

https://i-lcd.com/LCD/Graphic/240x64.php


CJay:
I like a result like that, finding and getting help from the designer is just great.

Interesting solution to limited resolution controller chips too, I really hope you can find an alternative display.

If you can't then it might be worth trying to track down one of the car LCD dashboard repairers, some of them have the equipment to rebond/replace the flat flex.

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