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Author Topic: convert 25 pin CRT to 17 pin LCD  (Read 1593 times)

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Offline Jim

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convert 25 pin CRT to 17 pin LCD
« on: November 04, 2014, 07:00:02 PM »
Did some research,came up with  information but not what I was looking for.


Has anyone done this, what's involved,  why the difference in pin count ?   I don't have any paperwork to figure this out.




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Offline Tilt

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Re: convert 25 pin CRT to 17 pin LCD
« Reply #1 on: November 04, 2014, 07:42:07 PM »
I've done the opposite, gone from a 17 pin CRT to 25 pin LCD, put the process is the same.  You have to swap out the monitor shelf and the wiring harness attached to it that goes to the motherboard.  You have to change the shelf because the 17 pin & 25 pin connectors are different sizes and the mounting holes on the shelves are different for each. 

They added some pins for separate grounds on the RGB signals, added pins for a serial EEPROM in the monitor, and a couple of other things.  The motherboard side of the cable is the same for a 17 or 25 pin cable though, so I'm not sure why they changed them.    I attached a couple of drawings showing the monitor side pinouts (P340) so you can see the differences.

I have a 17 pin monitor shelf for a 17" cabinet that I've been looking to swap out for a 25 pin shelf.  Let me know if you're interested in a trade.


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Re: convert 25 pin CRT to 17 pin LCD
« Reply #2 on: November 05, 2014, 05:11:26 AM »
It also involves some power wiring due to the fact the monitor cable has 120V AC which is a switched voltage coming off the on/off switch. This takes a little time to accomplish.

 

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