Pocketbook 912 Strange display's behavior

M_Faust · 04-30-2020, 07:53 AM

Hello.
Device: Pocketbook 912.
Problem: vertical strips on centre of display.
Solution: charge about 15 min or use hairdryer.
Anybody know what it is?

twowheels · 04-30-2020, 01:18 PM

Sounds like a bad ribbon cable connection between the cable and screen, or cable and motherboard.

Charging generates heat, and apparently just enough to improve the connection. Not sure if the PB cable is connected w/ a removable connector or soldered in place, but if you're up to it you might try opening it up and re-seating the display cable. If that doesn't work you can try running a soldering iron quickly across the ribbon cable to re-flow the connections at each side.

twowheels · 04-30-2020, 01:19 PM

Quote:

Originally Posted by twowheels

Sounds like a bad ribbon cable connection between the cable and screen, or cable and motherboard.

Charging generates heat, and apparently just enough to improve the connection. Not sure if the PB cable is connected w/ a removable connector or soldered in place, but if you're up to it you might try opening it up and re-seating the display cable. If that doesn't work you can try running a soldering iron quickly across the ribbon cable to re-flow the connections at each side.

...another common "fix" is to put it in a warm oven for a while, with the battery removed, not long enough nor hot enough to damage anything. Unfortunately consumer ovens don't have very good temperature control so it's not quite the same as a real reflow oven, much higher risk.

M_Faust · 04-30-2020, 03:13 PM

Quote:

Originally Posted by twowheels

opening it up and re-seating the display cable

Cable is connected with removable connector. Already tried re-seating. Doesn't work.
Thank you for advice. I am going to try to solder connector on motherboard.

rkomar · 04-30-2020, 04:55 PM

I vaguely remember reading about similar problems with the display when the battery was failing (not enough power to drive the display hardware). If you still have the original battery in your device, you might think about replacing it with a new one.

M_Faust · 05-12-2020, 03:43 AM

With probability 95% it is microcracks. When breathing on area with stripes at bottom of display strips disappearing.

04-30-2020, 07:53 AM	#1
M_Faust Zealot Posts: 106 Karma: 226 Join Date: May 2017 Device: PocketBook 912, Onyx Boox Max, Max 3	Pocketbook 912 Strange display's behavior Hello. Device: Pocketbook 912. Problem: vertical strips on centre of display. Solution: charge about 15 min or use hairdryer. Anybody know what it is? Attached Thumbnails Last edited by M_Faust; 04-30-2020 at 10:30 AM.

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04-30-2020, 01:18 PM	#2
twowheels Wizard Posts: 1,853 Karma: 13432974 Join Date: Nov 2010 Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro, Boox Note Max	Sounds like a bad ribbon cable connection between the cable and screen, or cable and motherboard. Charging generates heat, and apparently just enough to improve the connection. Not sure if the PB cable is connected w/ a removable connector or soldered in place, but if you're up to it you might try opening it up and re-seating the display cable. If that doesn't work you can try running a soldering iron *quickly* across the ribbon cable to re-flow the connections at each side.

04-30-2020, 04:55 PM	#5
rkomar Wizard Posts: 3,050 Karma: 18821071 Join Date: Oct 2010 Location: Sudbury, ON, Canada Device: PRS-505, PB 902, PRS-T1, PB 623, PB 840, PB 633	I vaguely remember reading about similar problems with the display when the battery was failing (not enough power to drive the display hardware). If you still have the original battery in your device, you might think about replacing it with a new one.

05-12-2020, 03:43 AM	#6
M_Faust Zealot Posts: 106 Karma: 226 Join Date: May 2017 Device: PocketBook 912, Onyx Boox Max, Max 3	With probability 95% it is microcracks. When breathing on area with stripes at bottom of display strips disappearing.

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