Troubleshooting: Blinking LCD

[DiTBho]

hi
I assembled today my Teres1 laptop. It boots fine, just ... sometimes the LCD blinks and it's annoying.

How can I solve this?

[LubOlimex]

It can be caused by a lot of things but it is usually related to the cabling. Poor connection between the cables or when a cable gets bent. If the flat ribbon LCD cable doesn't follow the recommended in the manual path, it might get bent especially if it goes around the hinges, causing cable extension when lid is open or closed. Bent flat ribbon cables might cause such LCD problem. Make sure that hinges don't interfere with LCD cables.

If the covers are not placed you can also test what happens if you touch the cable - whether the blinking can be "forced" by manipulating the cabling.

[kreyren]

hi
I assembled today my Teres1 laptop. It boots fine, just ... sometimes the LCD blinks and it's annoying.

How can I solve this?

Were you able to fix this issue?

[DiTBho]

I have the teres1 laptop powered by an external PSU and attached to an USB-sATA disk box, as I am testing my stage1-4 Gentoo rootfs coocked by Catalyst on Qemu/arm64 virtual box.

I yet updated neither the factory kernel, nor the rootfs, so it's booting { Linux v3.10.104, Ubuntu/Mate } from the eMMC, and all the tests are executed in a chroot.

That, to exclude software contamination. It seems and hardware problem.

Some weeks ago, I opened the plastic cover and moved the lcd cable a bit, then better secured with some extra tape. Not exactly fixed, but it's a lot less annoying.

It seems the Wi-Fi antenna, which is near the lcd cable, causes some interference, as I see some "glitches" only on high network traffic.
(e.g. wget/curl url:file ...)

[kreyren]

Some weeks ago, I opened the plastic cover and moved the lcd cable a bit, then better secured with some extra tape. Not exactly fixed, but it's a lot less annoying.

FWIW When i first assembled my teres i would get permanently no video as soon as i closed the lid and then opened it again, the cable needs to be routed around the hinge otherwise if you close the lid it will disconnect it from the PCB (not sure if that's the same issue, but seemed that might be relevant)

It seems the Wi-Fi antenna, which is near the lcd cable, causes some interference, as I see some "glitches" only on high network traffic.
(e.g. wget/curl url:file ...)

I can't reproduce this issue on Rev.C mainboard, what mainboard revision do you have?