The fact that the whole screen clears shows that the LCD is being reset, i.e. all LCD driver chips are getting reset and clearing each pixel, the default power on state of each pixel is black. So, this should mean that the LCD itself is OK, as it can go to both black and clear. A ‘RESET’ goes to each chip and this line is toggled as part of the start up sequence.
I have not looked at the M200 schematic but I’m assuming it uses the Hitachi type LCD drivers like the M100/102 does. I seem to recall these take a command word, like to set the ‘cursor’/write position and then the data to write. Since half of the screen is working properly the data lines are getting there OK as are any shared chip select and R/W signals. Any chip select from the main board that is unique to each driver would be suspect as well as any traces/logic on the LCD board to the affected areas. I’m not sure that helps, it will be a case of tracking down signals I’m afraid. Jeff From: M100 <[email protected]> On Behalf Of Gregory McGill Sent: Saturday, July 7, 2018 2:40 PM To: [email protected] Subject: Re: [M100] model 200 arrived.. the position seems the same but they come and go with different screen data, a clear screen shows no bars.. the menu shows some, a basic listing shows more and it changes as lines scroll Greg On Sat, Jul 7, 2018 at 10:42 AM Jeffrey Birt <[email protected] <mailto:[email protected]> > wrote: Are you saying the position of the black bars change?
