The place to share knowledge about upgrades, mods, customisations and all other cool DIY projects for MPCs and other music equipment.
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By wavemartian Fri Jul 10, 2015 11:29 pm
A guide for those wanting to replace the screen in their S900, if foil has degraded or inverter is dead. You can buy a blue background white script LCD display for $8 from buydisplay. First take the lid off, and place screws in a safe place. The take the faceplate scews off, and the ones anchored to the motherboard, you want to remove the inverter

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/Mobile%20Uploads/20150708_173218_zpsepqrjube.jpg.html]Image[/url][/url]

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/20150708_173116-1_zpsvyotkpdo.jpg.html]Image[/url][/url]

Now remove the old screen, you need to cut those two red and white wires that lead to the inverter. The white wire is the 5 v line. On the left hand side of the screen is the P401 clip, again the white wire is the 5 v line,

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/20150708_173859-1_zpsc6qjzpdu.jpg.html]Image[/url][/url]

Here is the old screen, see the 14 pin connector, you need that part, and can de-solder it, with a de-solder pump or solder braid

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/20150708_180641_zpswxmrphux.jpg.html]Image[/url][/url]

The inverter is not needed with the new lcd screen, but you can recycle the wires.

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/display_40x2_lcd_module_character_datasheet_pdf_ks0066_white_on_blue_zpswprdvxoj.jpg.html]Image[/url][/url]

This is the screen I found from this company, $8, notice it has 16 pins. The top 2 pins (15 and 16) are where you solder the two wires from the P401 clip, the bottom white wire goes to pin 15, the grey/white to pin 16. The 14 pin connector is soldered to pins 1-14.


[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/P7090226_zpser6ndjdt.jpg.html]Image[/url][/url]

The end result, actually appears a lot better than the photo here...and one more. Notice in the bottom left position below the screen, the bottom white clip is supplying the power, 5 volts, it is the bottom white wire that you solder to pin 15. The clip is P401.

[url][URL=http://s280.photobucket.com/user/Raoul_Cervini/media/P7090239-1_zpsvp1ziibz.jpg.html]Image[/url][/url]

Let me know if more details required
User avatar
By richie Wed Aug 31, 2016 12:48 am
It's the same controller chip, so yes.
By Spod Wed Aug 31, 2016 2:53 am
richie wrote:It's the same controller chip, so yes.


Great, thanks!
By teevee Mon Dec 05, 2016 12:16 pm
Thank you, for the well documented installation :)

I got one boring question, is there not supposed to be a resistor between the P401 and display connection?

You can make the connection without, but if you want to expand the lifespan....