Kite SAIO LCD washed out / text illegible

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Re: Kite SAIO LCD washed out / text illegible

Post by keffcat » Sun Jan 07, 2018 1:18 am

@kite Whoops, pin number 28 in that image, not GPIO28.

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Re: Kite SAIO LCD washed out / text illegible

Post by kite » Sun Jan 07, 2018 2:17 am

keffcat wrote:
Sun Jan 07, 2018 1:18 am
@kite Whoops, pin number 28 in that image, not GPIO28.
Image

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Re: Kite SAIO LCD washed out / text illegible

Post by keffcat » Sun Jan 07, 2018 2:25 am

kite wrote:
Sun Jan 07, 2018 2:17 am
keffcat wrote:
Sun Jan 07, 2018 1:18 am
@kite Whoops, pin number 28 in that image, not GPIO28.
Image
Yikes, that looks nearly impossible to solder. Are there any alternatives?

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Re: Kite SAIO LCD washed out / text illegible

Post by kite » Sun Jan 07, 2018 2:52 am

keffcat wrote:
Sun Jan 07, 2018 2:25 am
kite wrote:
Sun Jan 07, 2018 2:17 am
keffcat wrote:
Sun Jan 07, 2018 1:18 am
@kite Whoops, pin number 28 in that image, not GPIO28.
Image
Yikes, that looks nearly impossible to solder. Are there any alternatives?
Not impossible but very tricky! :P unfortunately DEN is one of the important pins that if not connected the LCD won't show.. :/

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Re: Kite SAIO LCD washed out / text illegible

Post by keffcat » Sun Jan 07, 2018 2:59 am

kite wrote:
Sun Jan 07, 2018 2:52 am
keffcat wrote:
Sun Jan 07, 2018 2:25 am
kite wrote:
Sun Jan 07, 2018 2:17 am


Image
Yikes, that looks nearly impossible to solder. Are there any alternatives?
Not impossible but very tricky! :P unfortunately DEN is one of the important pins that if not connected the LCD won't show.. :/
Okay, I managed to solder to that pin with a really thin wire, but it didn't fix the issue. My problem is similar to the issue in the OP, but not quite the same - the screen appears to be too bright (as in the blacks appear as more of a grey). All the color ramps look fine, and the text is legible, etc. Could this be a backlighting issue, and not having to do with the pink pins as I originally thought?

EDIT: It's hard to capture because the refresh rate is different from my phone camera, but you can kinda see it here:

Image

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Re: Kite SAIO LCD washed out / text illegible

Post by kite » Sun Jan 07, 2018 3:56 am

Hm it probably isn't correctly soldered still, that pin is 'data enable' and it is toggled when the display is allowed to read data, as anything outside of that data is 'not valid' and I suspect that is missing it up.. make sure that the pin on the Pi has no shorts to GND, and then if you have a spare wire to solder it to the Pi end and then while running touch it to that pin on the LCD connector, if it really IS the issue then the screen should pop briefly back to correct colours.. that is best way to test without soldering

EDIT:

Here is the pin, NOTE that the ones to the right (pins 1 and 2) are GND, don't solder to here!! However the other pins are unused so it doesn't matter if they are bridged

Image

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Re: Kite SAIO LCD washed out / text illegible

Post by keffcat » Sun Jan 07, 2018 9:55 am

kite wrote:
Sun Jan 07, 2018 3:56 am
Hm it probably isn't correctly soldered still, that pin is 'data enable' and it is toggled when the display is allowed to read data, as anything outside of that data is 'not valid' and I suspect that is missing it up.. make sure that the pin on the Pi has no shorts to GND, and then if you have a spare wire to solder it to the Pi end and then while running touch it to that pin on the LCD connector, if it really IS the issue then the screen should pop briefly back to correct colours.. that is best way to test without soldering

EDIT:

Here is the pin, NOTE that the ones to the right (pins 1 and 2) are GND, don't solder to here!! However the other pins are unused so it doesn't matter if they are bridged

Image
Okay, that didn't solve the problem. However, I found another issue - it looks like when the Pi3 is on, pin 28 gets pulled to ground (pin 06). Any ideas what could be causing this?

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Re: Kite SAIO LCD washed out / text illegible

Post by kite » Mon Jan 08, 2018 2:26 am

keffcat wrote:
Sun Jan 07, 2018 9:55 am
kite wrote:
Sun Jan 07, 2018 3:56 am
Hm it probably isn't correctly soldered still, that pin is 'data enable' and it is toggled when the display is allowed to read data, as anything outside of that data is 'not valid' and I suspect that is missing it up.. make sure that the pin on the Pi has no shorts to GND, and then if you have a spare wire to solder it to the Pi end and then while running touch it to that pin on the LCD connector, if it really IS the issue then the screen should pop briefly back to correct colours.. that is best way to test without soldering

EDIT:

Here is the pin, NOTE that the ones to the right (pins 1 and 2) are GND, don't solder to here!! However the other pins are unused so it doesn't matter if they are bridged

Image
Okay, that didn't solve the problem. However, I found another issue - it looks like when the Pi3 is on, pin 28 gets pulled to ground (pin 06). Any ideas what could be causing this?
At this point it might be better to start your own thread with all this info :P

Do you have a logic analyser or oscilloscope? The signal on that pin is very high speed and would appear low/high to a multimeter depending on how it samples the data.. if it is shorted to GND when OFF, then that is a hardware short! If it is when "on" then it's probably a real data signal.

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