Need help with variant 9 screen
Posted: Mon Jan 30, 2017 10:52 am
Hi folks!
Hoping that somebody may be able to help me setting up the variant 9 screen, I've found that there are a lot of contradictions in how to modify it and set it up for testing with the pi.
First some background, this is my second attempt at modifying this screen type (some dodgy soldering ended up in me knocking off and loosing a few smds on the first one), I began my modification as shown in the wiki (http://sudomod.com/wiki/index.php?title ... t-9_5V.jpg) removing the IC and soldering the 5V line to the appropriate pin (pin 3). This would not work and I came across another poster whos image showed the same board and the chip connected on pin 2 (http://www.sudomod.com/forum/viewtopic. ... t+9#p23963), which i then tried with no success. Testing with the pi consistently yielded no results, not even a backlight so my deduction is that no power was coming through. After much trawling I found a few examples of people modifying the board by just connecting to the 5V pin without removing the chip. So I replaced the chip (I have experience with soldering surface mount components so was able to do it reasonably neatly with no bridged connections) and reattached the 5V line. Now this did work, momentarily, and the picture was very fuzzy prior to loosing it, so my conclusion is that I have possibly connected it incorrectly to the pi? Initially I was connecting ground to PP6, 5V to PP1 and the white wire (signal) to the IO labeled TV. I read another post which advised against using PP1 & PP6 and used the GPIO after.
This is the configuration which worked briefly. I'm at a total loss as how to continue and would really appreciate any advice!
Hoping that somebody may be able to help me setting up the variant 9 screen, I've found that there are a lot of contradictions in how to modify it and set it up for testing with the pi.
First some background, this is my second attempt at modifying this screen type (some dodgy soldering ended up in me knocking off and loosing a few smds on the first one), I began my modification as shown in the wiki (http://sudomod.com/wiki/index.php?title ... t-9_5V.jpg) removing the IC and soldering the 5V line to the appropriate pin (pin 3). This would not work and I came across another poster whos image showed the same board and the chip connected on pin 2 (http://www.sudomod.com/forum/viewtopic. ... t+9#p23963), which i then tried with no success. Testing with the pi consistently yielded no results, not even a backlight so my deduction is that no power was coming through. After much trawling I found a few examples of people modifying the board by just connecting to the 5V pin without removing the chip. So I replaced the chip (I have experience with soldering surface mount components so was able to do it reasonably neatly with no bridged connections) and reattached the 5V line. Now this did work, momentarily, and the picture was very fuzzy prior to loosing it, so my conclusion is that I have possibly connected it incorrectly to the pi? Initially I was connecting ground to PP6, 5V to PP1 and the white wire (signal) to the IO labeled TV. I read another post which advised against using PP1 & PP6 and used the GPIO after.
This is the configuration which worked briefly. I'm at a total loss as how to continue and would really appreciate any advice!