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NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: maded2 on July 05, 2024, 11:00:13 PM

Title: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: maded2 on July 05, 2024, 11:00:13 PM

hi,
   I did the LCDDRV mod for my GT.  I remember reading other people have wired to use the existing brightness wheel to adjust the brightness LCDDRV.   Can anyone tell me the steps?

thanks in advance.

Title: Re: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: Keith Courage on July 07, 2024, 02:13:23 AM

I'll be working on a RGB screen PC engine GT later tonight. Will update with pictures for the brightness then. You just have to solder in 1 wire from the Screen to the brightness dial.

Title: Re: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: Keith Courage on July 08, 2024, 06:32:12 AM

Here are the two points to solder in the wire. Also make sure to solder/bridge the small jumper (JP1) on the LCDDRV board.

(https://i.postimg.cc/phhp05s4/IMG-20240707-052259047.jpg) (https://postimg.cc/phhp05s4)

(https://i.postimg.cc/f3Fb0TMK/IMG-20240707-052313533.jpg) (https://postimg.cc/f3Fb0TMK)


You will need to turn down the brightness pot on the LCDDRV board quite a bit to compensate for the added brightness.

Title: Re: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: maded2 on July 08, 2024, 10:31:50 AM

thank you, so only need to solder 1 wire.  I will give it a try.

Title: Re: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: Diygizmo on January 20, 2025, 12:21:03 AM

This single wire connection doesnt work for me, does anyone knows how to hook this up?
I found these set of images not sure which cable goes where:

https://imgur.com/a/turbo-express-lcddrv-brightness-control-hookup-SChhF4J


Thanks!

Title: Re: PC-Engine GT with LCDDRV mod - how to add brightness control
Post by: Keith Courage on January 22, 2025, 05:37:46 AM

Did you make sure to also solder the jumper on the LCDdrv board?

Around 4-5 years ago I used to wire things up with two wires but then something changed schematically with the LCDDRV board where the two wire method no longer worked.