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Screen contrast issue


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#1 MrBlond750 OFFLINE  

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Posted Mon Feb 20, 2012 3:16 AM

I bought a cherry Lynx II from eBay in the box with several games. Cosmetically the thing is perfect. Mush have had very little play time. After I got it I used it almost every day. I must say this is my first Lynx, and I love it. I have been modifying DMG gameboys for some time so I am familiar with electronics. I noticed that when the batteries in the Lynx begin to die you the contrast changes and you have to adjust the contrast to compensate, eventually you cannot compensate any more and are force to change you viewing angle till either the screen goes blank of the angle is so extreme you can't see anymore. My problem is that after the last batterie change the contrast did not return to normal. I have the contrast wheel turned all the way to brightest setting and I can just barely see the image if I view at about 45 degrees. I'm thinking maybe the contrast wheel might need replaced. Any advice???

#2 chris_lynx1989 OFFLINE  

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Posted Mon Feb 20, 2012 3:41 PM

Possibly that.Also,have you looked at the screen ribbon socket for proper seating or age cracking across the bend of the ribbon?The cracking happens,I had it. ;) If the Lynx has been worked on (and you're not careful) or dropped the ribbon(s) can pull out on you. :)

#3 MrBlond750 OFFLINE  

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Posted Mon Feb 20, 2012 6:56 PM

As far as I know it has never been worked on, I bought it to play. I just turned it on after the first time it happened and the screen came on as normal, but then began to fade in and out. After about 15 seconds of being on the screen went blank.

#4 chris_lynx1989 OFFLINE  

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Posted Mon Feb 20, 2012 11:16 PM

Clarify "the screen went blank" for me. :) Any sound?Is there any brightness control?Sounds like the brightness pot is dirty or the backlight is failing to me.

Also,are you using good strong batteries or a 9 Volt 1Amp adapter?Both are important for Lynxing. ;)

Edited by chris_lynx1989, Mon Feb 20, 2012 11:18 PM.


#5 MrBlond750 OFFLINE  

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Posted Tue Feb 21, 2012 1:58 AM

Energizer are the only batteries I use. I have tried sever sets of new batteries always with the same result, I don't have an ac adapter for the lynx. It looks to me like the backlight is working fine, I can see the light nice and bright at the perimeter of the screen and when you look into the holes where the contrast wheel and the volume wheel are. The sound works fine. The buttons work fine. When it happens, it looks like you turned the contrast all the way to the left, or the dimist setting. I have been turning it on thought the day to monitor it and the contrast works fine untill 15 to 45 seconds after you turn it on. Then the contrast fades away till you have a all black screen. I wonder if it's a capacitor since it always works for a bit right after being powered on?
Thanks a lot your your help, by the way. I really appreachite it.

#6 chris_lynx1989 OFFLINE  

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Posted Tue Feb 21, 2012 11:36 PM

Yeah,if you have backlight and sound and some image for up to 45 sec,you've got an LCD driver or a bad LCD,I think. :)

Let me think on this and get back to you here tomorrow.

You're welcome. :)

#7 MrBlond750 OFFLINE  

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Posted Thu Feb 23, 2012 11:25 AM

I keep trying it cause this started all of a sudden. Every time I turn it on its the same thing regardless if I start playing a game or just let it sit. If I let it fullly cool off completely (or have it off for more than an hour or so) it lasts the longest when turned back on (about 45 seconds, passably a min). During the initional startup the contrast wheel works as normal, as the time passes I need to adjust the contrast to the right or brighter setting to compensate for what is happening. Eventually I cannot adjust the contrast anymore and the contrast continues to change untill the image goes all black.
Thanks again for you assistance!

#8 Moya Jackie OFFLINE  

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Posted Fri Feb 24, 2012 12:43 AM

I have this busted Lynx. It doesn't work on batteries because the previous owner left batteries in it for years and they exploded inside it. So I bought a power pack for it, plugged it in and it actually turned on, the music started and I could hear that the game worked after pressing some buttons and hearing the sound effects, but there is no picture at all on the screen. The backlight works, but adjusting the contrast knob has no effect, the screen is blank. After opening it up, pulling it apart and putting it back together, making sure the screen ribbon was firmly in (it reminds me of my Amiga's keyboard ribbon), there was still no picture. Then the whole thing stopped working, possibly from the crappy power socket, hopefully not something else. I've not been able to get it working at all since then, so I'm not sure what the problem with the screen was but maybe it's similar to what has happened in yours.

So, I guess I'm sorry this doesn't help at all, but I share your pain, you're not alone.

Edited by Moya Jackie, Fri Feb 24, 2012 12:48 AM.


#9 chris_lynx1989 OFFLINE  

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Posted Fri Feb 24, 2012 1:15 AM

I have bad news for you,man.

You have something wrong within your video circuit that may be a bitch to fix! :( It could be any one of 6 different things on your Lynx board and/or your LCD panel. :(

Also,you may have one of the last 30,000 Lynx units that were NEW AND FAULTY that the Tramiels were sitting on at a warehouse in Hong Kong up until '97 or something before they got dumped on Video Game Liquidators or etc. :( No way to tell by Serial # or anything for sure.Many still on Ebay & etc like this.

#10 MrBlond750 OFFLINE  

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Posted Sun Apr 13, 2014 11:31 PM

Hey guys, still haven't even looked into this, I kept the lynx cause the thing is near perfect, not a scratch on it. But I have another and have been playing it regularly. I know I need to at least get into it but I don't know when I will.

Thanks Chris for the follow up and hunting down the info for me.




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