havensole Posted October 20, 2006 Report Share Posted October 20, 2006 hey all. hoping someone out there can help me with this. i have a seiko l4042 (led backlight version) adn when i plug it in, nothing is displayed and the regulator gets really hot, and the voltages all over go down to almost zero. i've checked the pinouts in the datasheet and it looks like i have everything soldered right. was thinking it was a ground issue. thanks for you help guys.-have sole Quote Link to comment Share on other sites More sharing options...
havensole Posted October 21, 2006 Author Report Share Posted October 21, 2006 ok, well issue is slightly resolved. found a forum somewhere that said not to use pin 15 and 16 for the backlight led's, but to use the pads on the right hand side of the pcb instead, and guess what, i got backlight. only issue now is that i'm getting nothing else. tried using my lcd module for my sid and it all works. guessing i must have something pinned wrong. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 21, 2006 Report Share Posted October 21, 2006 does it only fail to work when the backlight is connected? Quote Link to comment Share on other sites More sharing options...
havensole Posted October 21, 2006 Author Report Share Posted October 21, 2006 actually, i just de-soldered, and re-soldered all the pins 5 min. ago, and it works fine. contrast is crap though. i nkow someone said something about supplying -2 volts to it, but didn't explain where to supply it. thanks though. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 22, 2006 Report Share Posted October 22, 2006 sometimes a -Voltage on the Vs pin helps, but be sure before you do this. Quote Link to comment Share on other sites More sharing options...
havensole Posted October 23, 2006 Author Report Share Posted October 23, 2006 yeah, i found a posting from a guy who has the same lcd's and he says they need -2 volts for decent contrast. so on monday i get to go to the electronics store and get some diodes and zener diodes. hopefully that'll be the end of this thread. 1 other question to pose to the group. i was thinking about inverting the diplay (white on black vs. black on white). i've read a some site that say take the diplay apart and to use polorizing film on the glass. i would really prefer not to take it apart, so i was wondering if one could use an inverter chip (hex or binary) instead. thanks everyone. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 23, 2006 Report Share Posted October 23, 2006 the polarity of lcd screens is down to the polarizing filter, so you would have to take it apart. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.