my korg pa800 display off

atooraya · Post by **atooraya** » Thu Feb 06, 2014 3:54 am

please help my pa800 turns on everything works but display is blank i had another screen i try that one as well same no display please please any advise i be appreciate it

YO8RZE · Post by **YO8RZE** » Thu Feb 06, 2014 5:25 am

I think the defect is in the module wich powering a CCFL tube: part GRA0002107 in service manual.

kamran_uk12 · Post by **kamran_uk12** » Fri Feb 07, 2014 1:41 am

No I am afraid the defect may have occurred in the motherboard itself.
If you cant have display on the secondary panel, chances are the main board defect. If CCFL tubes are burned, the LCD should be ON and if you can throw some light with a torch to the LCD, you should see the menu and fonts etc in dark state but still visible, If this is the case, then your CCFL are gone and you need not to worry as they cost very low to replace.

-thanks

I will write or else start a topic to place a mini computer's cpu fan inside the keyboard to cool the main board thus avoiding any damage which may have been caused by over heating...

atooraya · Post by **atooraya** » Fri Feb 07, 2014 2:12 am

kamran_uk12 wrote:No I am afraid the defect may have occurred in the motherboard itself.
If you cant have display on the secondary panel, chances are the main board defect. If CCFL tubes are burned, the LCD should be ON and if you can throw some light with a torch to the LCD, you should see the menu and fonts etc in dark state but still visible, If this is the case, then your CCFL are gone and you need not to worry as they cost very low to replace.

-thanks

I will write or else start a topic to place a mini computer's cpu fan inside the keyboard to cool the main board thus avoiding any damage which may have been caused by over heating...

main board or cpu board witch one? there is two board on top each other
and i check with light nothing dead screen

atooraya · Post by **atooraya** » Fri Feb 07, 2014 2:15 am

thank you so much for reply and help
i did test it with strong flash light on dark but nothing visible dead screen so there is two board witch one might be bad main board or CPU board?there is two board on top each other

kamran_uk12 · Post by **kamran_uk12** » Fri Feb 07, 2014 2:58 am

The problem looks like its from the LCD driver Video board, although its not the main motherboard but it does has connection with it. so without proper investigation I cant say exactly where the problem might be. usually the voltage regulator for the video board dies, if that is the case, you are safe. otherwise you have to change the entire board.
The Korg repair shop doesnt go in minute details to diagnose or correct the problem, rather they change the whole board which is time saving and easy.

-thanks

Another thing is that find a way through buttons to enable video out, maybe its turned off from the menu, also set proper frequency 50/60 Hz. for the output panel. Look in the manual for help to configure it. If that works, your LCD unit itself is faulty, and may need to only change that.

atooraya · Post by **atooraya** » Fri Feb 07, 2014 4:26 am

thank you but i can not see anything on screen to check for enable button
the flat cable goes from CPU board to the small board on display.
i don't know thanks for all info