TechnicsKN2000 Blue screen no graphics help


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Hi guys i have this old Technics KN2000, that lately lost screen graphics ,any fix for this,i have some experience on electronics on tvs and PC , so any clues would be appreciated,
 
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Welcome.

Do you have any areas if the keyboard that function?
Thanks mate, I have kinda tinted color on some areas and some times graphics come back kinda faded distorted and soon dissapear
.
 
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happyrat1

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Check on the back of the keyboard for a potentiometer knob that controls screen contrast,

Or it could be under menu control. Check your manual.,

If there's a knob try swiping it back and forth a few dozen times to see if it clears any gunk on the pot.

If that doesn't work then try a squirt of Deoxit Contact Cleaner into the pot and work it in a few dozen times.

If none of the above work then it may be the LCD Backlight that's failing. Look around on Ebay for a replacement display.

Gary ;)
 

happyrat1

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Before you replace the LCD though, open it up and check the ribbon connectors. Carefully lift them off and squirt some Deoxit on the ribbon contacts and carefully reseat them in the original position.

It helps to take a lot of pictures with your phone when you start disassembling a keyboard so you know how to put it back together again.

Gary ;)
 
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Before you replace the LCD though, open it up and check the ribbon connectors. Carefully lift them off and squirt some Deoxit on the ribbon contacts and carefully reseat them in the original position.

It helps to take a lot of pictures with your phone when you start disassembling a keyboard so you know how to put it back together again.

Gary ;)
Thanks mate i already opened it a couple times ,and tried to reseat ribon cables to the man-board ,maybe the cable itself is bad ! who knows,unfortunately no ribbon cables available,will open it one more time to investigate,thanks
 

happyrat1

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On a lot of keyboards the display is located on a daughter board with a header attached to the main board. These are the contacts that may need cleaning.

Does the backlight still work or is the board dark now?

BTW, be careful working with older fluorescent style backlights. They can carry quite a voltage and give you a nasty shock when powered up.


Gary ;)
 
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On a lot of keyboards the display is located on a daughter board with a header attached to the main board. These are the contacts that may need cleaning.

Does the backlight still work or is the board dark now?

BTW, be careful working with older fluorescent style backlights. They can carry quite a voltage and give you a nasty shock when powered up.


Gary ;)
Thanks mate; well for now i gave up on this since there are some functions and sounds work ok only limited to sounds cause can'st see them on the screen,besides that it works ok,. the screen is completely blue no graphics at all, besides i have another keyboard which is Yamaha PSRS910 , i rarely use KN2000, cause the sounds on PSrs910 are from other Galatia, i just don't send this KN2000 to the Dumpster cause of Simmental value
 

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