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NSM4202A LED Display Module Replacement for Philips / Sony CDM Transports
NSM4202A LED Display Module Replacement for Philips / Sony CDM Transports
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Old 29th July 2014, 01:54 AM   #1
NoNameXII is offline NoNameXII
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Default NSM4202A LED Display Module Replacement for Philips / Sony CDM Transports

I have an old Krell MD-2 CD turntable, and (among other issues) several segments have gone out on the LED display. After looking around online, I found one person in France that had built a replacement, but details were kind of scarce, so tried to reverse engineer my display module based upon the tidbits of information that I was able to uncover.

After hooking it up to a scope, it appeared to use SPI (keep in mind that I'm not very smart), but I just got rubbish when I created a small Arduino program to read the data, so I traipsed through the available LED drivers on DigiKey, and came across the MM5450 as one of the very few chips that didn't require I2C. Upon reviewing the data stream again, it appeared to fit with what was required to drive this chip. Anyway, I did the best that I could to guess the pinout of my existing display board (it uses an unmarked glob to hold down the IC die), and was able to reconcile it with the MM5450 pinout, so I made up a board, bought some parts, and tried it out. It appears to be fully functional, so I thought that I would share it here so that others can create a replacement for themselves as necessary. I'm kind of hoping that since this hardware is over 25 years old (and apparently out of production for quite some time) that Philips won't mind too much the publishing of plans for a replacement...

Anyway, here goes with the information:

Feel free to use this information however you wish, so long as you don't make anyone pay for it. I don't care if you charge someone to assemble a board for them or something (it's none of my business), but the information should be kept in the open. I abhor GPL-like licensing, but I do expect you to not be a turd.

I am just a hobbyist (and a really unintelligent one at that), so I do not make any representation that information is accurate, safe, or suitable for any purpose, even a purpose that may be implied by the information. In other words, I did the best that I could, it worked for me, but it's not on me if you hurt yourself or start a fire or something.

I have the board shared at OSH Park (https://oshpark.com/shared_projects/P3nC9ISV) for convenience. I make nothing from this link or design (AFIAK), and I don't care from where you order your board.

BOM:
  • U1 - Micrel MM5450 (PLCC-44) LED Display Driver
  • DS1-DS4 - Kingbright ACSA03-41SGWA-F01 7-Segment Common-Anode LED Display (Green, other colors probably available)
  • D1-D2 - 0603 SMD LED (Green for use with the specified green LED digits)
  • R1 - 7.5kOhm (or higher) 1206 SMD Resistor (controls brightness)
  • C1 - 1000pF 1206 SMD Capacitor
  • J1-J3 - 0.1" header system of your choice

Electrical Schematic:
NSM4202A Schematic.pdf

Front of PCB:
NSM4202A Front.png

Back of PCB:
NSM4202A Back.png

Gerbers for PCB:
NSM4202A.zip

DipTrace Schematic and Board Files:
NSM4202A DipTrace Files.zip
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Old 14th February 2017, 07:38 PM   #2
bram jacobse is offline bram jacobse  Netherlands
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I have created an NSM4002 / NSM4202 replacement

Regards Bram Jacobse

BOM:
U1 - Micrel MM5450 (PLCC-44) LED Display Driver
DS1-DS4 - Kingbright ACSA03-41SGWA-F01 7-Segment Common-Anode LED Display (Green, other colors probably available)
R1 - 10kOhm (or higher) 1206 SMD Resistor (controls brightness)
C1 - 1000pF 1206 SMD Capacitor
C2 - 100nF 1206 SMD Capacitor
J1 - 0.1" header system of your choice


NSM4202-kleur.png

werkt.jpg


nsm-schema.jpg

Gerber files
gerber-NSM4202_v1_3.zip
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Old 13th August 2019, 04:48 PM   #3
Shoemaker is offline Shoemaker  Germany
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Location: West Germany near Münster
Thumbs up Alive again!

Hi guys,

I've several old Philips gear in use. My "Daily Player", a CD-460, also had the common problem with missing digits on the 4202(A). Not a big issue, as long as something could be seen. But during the last year most of the segments were lost.

I've found this thread, but as my eyes for some circumstances cannot deal with SMD, I asked Bram if he'll be willing to put a complete display together for me . And he did!

Installation was easy, and now my old buddy not only plays music like a young fellow, it even looks like one . Exact this player was the first CDP my father owned back in the 80's, and little Ingo liked watching the rotating CD through the window.

Thanks a lot, Bram, for sharing your work on Diyaudio and again a big thank you for the kind service!

Best regards

Ingo


(BTW: Complete reworked with NOS-conversion, but even better in combination with the Parasound D/A converter 1100HD.)
Attached Images
File Type: jpg NSM4202A_ (2).JPG (94.8 KB, 367 views)
File Type: jpg NSM4202A_ (4).JPG (130.6 KB, 367 views)
File Type: jpg NSM4202A_ (6).JPG (121.7 KB, 365 views)
File Type: jpg NSM4202A_ (8).JPG (121.9 KB, 366 views)

Last edited by Shoemaker; 13th August 2019 at 04:50 PM.
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Old 13th August 2019, 05:22 PM   #4
Mooly is offline Mooly  United Kingdom
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NSM4202A LED Display Module Replacement for Philips / Sony CDM Transports
That is fantastic, really nice work those original display modules were a problem from the very beginning.
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Old 13th August 2019, 05:25 PM   #5
bram jacobse is offline bram jacobse  Netherlands
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More off my NSM4202 en NSM4202a project can be found here

NSM4202a naar NSM4202 & NSM4002 - MFBfreaks.com
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Old 2nd September 2020, 07:39 AM   #6
jcdignan is offline jcdignan
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Hello, the link is down !
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Old 8th April 2021, 08:17 AM   #7
Mikey66 is offline Mikey66
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Thanks for this, it's saved my Philips CD202 whose display finally died recently.
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Old 9th April 2021, 02:19 PM   #8
bram jacobse is offline bram jacobse  Netherlands
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