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Old 25th March 2013, 13:11   #1 (permalink)
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Inspiration Classic Handset LED change

Has anyone taken their classic handsets apart and identified the types of LED used to backlight the display?

A friend has asked me to help him change the LEDs in his handset and I can find very little information about these on the web which surprised me, especially given how often people talk about "dim LEDs" on these handset I would have thought this would be a common hack.

The only decent photos of handset internals I have found are here...
classic with some bomb proof handsets - CCR Explorers

Looks like a standard LCD module so probably got some SMT LEDs mounted under the edges of the glass. It would be useful to know the part numbers so I can have the replacements in hand before disassembling the handset.

No need for any safety advice - my mate is expendable

Thanks in advance for any help
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Old 25th March 2013, 13:46   #2 (permalink)
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Re: Inspiration Classic Handset LED change

The handsets are "potted", so you'll need to pick that away.
As to the handset LED modules, the only person I know who had one that far apart reports it was a Hitachi module, but they didn't write down the part no's
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Old 25th March 2013, 19:08   #3 (permalink)
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Re: Inspiration Classic Handset LED change

In terms of LCD displays Hitachi is more about the protocol used to run them than the manufacture.

So generally speaking, if its the same size and the pin layout is the same chances are any "Hitachi" LCD or even OLED will work.

They are cheap enough that its better to swap out the whole display as opposed to swapping out the back lighting.
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Old 26th March 2013, 22:57   #4 (permalink)
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Re: Inspiration Classic Handset LED change

I will take some photos this afternoon and upload.
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Old 27th March 2013, 10:05   #5 (permalink)
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Re: Inspiration Classic Handset LED change

That would be great Wiz, many thanks.

If you could get the dimension of the display module that would be really helpful too.

Looking at 2x16 line lcd display modules currently on the market with the 2x8 pin connector on the short side (latest trend is a 1x16 way on the long edge) I'm guessing the dimensions of the display circuit board will be 85mm wide by 36mm high but I'm not sure of the overall depth, this might be 11mm or 13.5mm.

It's interesting that you can get some OLED versions of this module but it would be necessary to understand the power budget (current consumption) of the original modules before going down this route.

The replacement module I'm considering is the MC21605B6WD-SPTLY (External Depth: 11mm) from Farnell which has 20mA current consumption
MC21605B6WD-SPTLY - MIDAS - LCD, 2X16, STN, YLW/GREEN B/L | Farnell United Kingdom

I look forward to seeing the photos.

Thanks again
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Old 27th March 2013, 10:54   #6 (permalink)
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Re: Inspiration Classic Handset LED change

This is interesting, please keep us updated!
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Old 27th March 2013, 12:38   #7 (permalink)
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Re: Inspiration Classic Handset LED change

I hope they are of some assistance.
Not great images, especially as they are still potted.
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Old 27th March 2013, 19:41   #8 (permalink)
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Re: Inspiration Classic Handset LED change

Any pics of the back, specificity where the wires attach to the display.
How many wires connect?
Where are the switches? Are they halleffect? Are these the 3, 3 legged componets shown in the pic potted with the display?
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Old 27th March 2013, 22:10   #9 (permalink)
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Re: Inspiration Classic Handset LED change

Quote: (Originally Posted by Packhorse) View Original Post
Any pics of the back, specificity where the wires attach to the display.
How many wires connect?
Where are the switches? Are they halleffect? Are these the 3, 3 legged componets shown in the pic potted with the display?
I will get a pic of the back this afternoon and make sure to count/include any wires I can see.

The 3 x 3 legged pieces are the hall effect switches.
The potted block is 85mm long which makes the display about 75mm long.
I will take some more measurements when I photo the back.

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Old 27th March 2013, 23:31   #10 (permalink)
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Re: Inspiration Classic Handset LED change

On a closer look at the pic it looks like there are 2 PCB boards. The top one is the display.
The bottom board is the APD specific board.

If you can dig out the potting and remove the top board you should be able to replace it with any other Hitachi LCD with the same pin configuration.
That one seems to have 2 rows of 8 pins opposed to the more common 16 pins in a single row.

You could use either but the 8x2 would be simpler.

Hitachi HD44780 LCD controller - Wikipedia, the free encyclopedia
Crystalfontz: Standard Character LCD Modules, Text LCD Modules, Parallel LCDs, HD44780 Compatible LCD Modules (Liquid Crystal Displays)
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