Jolla display issue [answered]
asked 2016-10-04 15:29:57 +0300
This post is a wiki. Anyone with karma >75 is welcome to improve it.
I'm planning to contact support, but thought would share it here as well first.
My display's been acting up for 3 months, permanently. I've learned to live with it for I like the phone. I'm sure there's a correct terminology for the issue, a better one than "flickering", or someone may have an idea on the root cause?
When the problem started the device was being used in a sealed, water-tight bag and were sitting on the sun, but not directly exposed to it, for longer periods (1-2 hours at a time) running an Android app. There was no mechanical impact or excessive mechanical force applied. The weather wasn't wet either.
Everything works and all display related tests pass in the CSD utility.
Yep, seems to be a HW problem.
juiceme ( 2016-10-04 15:34:28 +0300 )editNot sure if phones have them, but many aging non-led laptops have a similar issue, usually this has to do with a faulty power inverter.
Andrik ( 2016-10-04 16:30:40 +0300 )editThanks. I believe there are no power inverters in mobile phones. My optimistic scenario was that maybe a display related kernel parameter got crooked, but I don't know what to look for. I'm inclined towards a hardware failure too.
hlev80 ( 2016-10-05 01:17:46 +0300 )edit@hlev80, basically there are 2 possible ways to implement the backlight of a LCD screen; with LED's or with an EL panel. At least up to quite recently EL panel is cheaper than LED backlighting so I suppose it well might be used in Jolla sbj1 device.
EL panel needs a supply voltage in the range of tens of volts and requires an inverter to upconvert the battery voltage...
juiceme ( 2016-10-05 06:37:34 +0300 )editThanks @juiceme, so EL panels need AC, beyond just a higher voltage? I learned something today indeed.
hlev80 ( 2016-10-05 18:35:59 +0300 )edit