HELP? - Odd Screen Problem

[g-raffballs]

Hi Peeps,
I'm getting along with my first Zero build, but I ran into an odd Screen Problem. maybe someone (with electrician skills ) can help?

I run the BW SCREEN variant 13 and bridged the chip to run it on 5V like discribed in the wiki:
(https://www.sudomod.com/wiki/images/f/f ... ithmod.jpg)

THE PROBLEM:
if I have the 5v bridge aplied, the whole System (Pi, screen, arduino) doesn't turn on at all.
If I remove the bridge and power on everything poweres up, the screen is white.
AND if I apply the bridge after I powered up, the screen pops on perfectly and everything works fine.

So it's like you'd have to power the screen a little later then everything else and then it actualy works.
I already googled a bit and found that there is chips like NE555 or analogue methods to delay a power up of the screen and probably you could also do that with the arduino? And of course I could add an extra Screen-Power-Switch, but that wouldn't be to elegant...

So first of all, why the heck is that happening? I don't understand how that works on an electrician level, much less fixing it.

Second, Does anyone have a clue?!


Pictures of my weird solution: Combining the two wires, after a Power up, fixes the problem.

SpoilerShow

photo_2019-07-30_15-27-58.jpg (105.38 KiB) Viewed 4571 times

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photo_2019-07-30_15-27-53.jpg (103.04 KiB) Viewed 4571 times

[infinitLoop]

have you tried removing the chip completely, and just running the power wire to the pin, where the chip was? I think that people have had better luck on that model with that approach.

[Helder]

Also what power board are you using to power all of This? Might be too much for it to handle on bootup.

[Jakeup]

have you tried removing the chip completely, and just running the power wire to the pin, where the chip was? I think that people have had better luck on that model with that approach.

100% this, I had similar issues to what you’re experiencing and if you clip that little fucker out you’ll be back in business

[Dawilson123]

Damn, I thought it was the LCD ribbon cable that had split but maybe it was this all along why my lcd screen wasn't working.

viewtopic.php?f=43&t=8366&p=76562#p76562

When the new LCD comes in, I'll test it first and if it still doesn't work, I'll be clipping that chip off the controller board.

I wasted hours trying to figure that one out!! Thanks guys for the solution.

[g-raffballs]

Yooo guys, sorry I didn't see all the nice answers.
I had a nano booster 500ma runnin and a friend hinted that this is probably a power problem. That it draws peak power at the beginning and the tiny Charge modul can't handle it.
No I spent a fortune on that 1000c from adafruit and tadaaa - Problem NOT solved...

So here I am, back again. I'll try removing the Chip now and report back!

[g-raffballs]

have you tried removing the chip completely, and just running the power wire to the pin, where the chip was? I think that people have had better luck on that model with that approach.

Niiice, thanks for the advice!
It seems to be working for now!!!