Quote
stingraze - 2022-04-03 4:08 PM
I was trying those keys for brightness and contrast but didn't seem to work.
I think it's due to old age, the backlight module is a little bit wonky.
I can do some electronics, but don't really want to possibly break this, lol.

Hi Stingraze!
Lucky you! Cool looking little beastie there... bet you'll have fun with that. Actually the screen looks fairly bright, outdoors would be the real test,though.
Actually the LED backlight upgrade isn't all that worrisome or invasive IMO, and I'm working on a drop in version with no soldering.
I will have detailed photos... how to remove the screen backside ie, remove 2 torx screws under those logo stickers, use guitar pick to pop off top, then release the ribbon cable, disconnect ccfl inverter from ribbon tab, unplug from ccfl power inverter and remove , then unbend the small metal tabs on the bottom of screen, undo yellow tape, lift gently about 2-3 mm, clip white wire from right side
(under grey rubber "boot"|, slide out CCFL tube, slide in LED strip, orient LED face side up,a dab with glue gun to secure, mount new LED boost converter , connect ribbon cable, use guitar pick to replace top so no plastic tabs are broken, replace screws, replace logo stickers over screw holes. Yer Done!! So, should you ever need an upgrade... is quite possible.
BTW, using WRP proxy server and any wifi card you can actually get online with the J680/690 and its PIE3! Slow, but can be done!
I'm just now trying out the new LED screen using Devuan_Linux and found it will require resetting screen brightness parameters on a J720
(in Devuan mode
)... nice improvement once you learn how to get out of the black screen mode on boot-up.
Best regards,
joval
(I guess you can tell from all the verbosity that this is posted from j720/Devuan/WPA to RasPi4/Firefox hybrid... I forgot how well it zips along compared to WinCE/open wifi to esp8266 WPA2/to WRP-proxy. Both are fun though! Best of both worlds...
Edited by joval 2022-04-08 8:03 AM