[HH] advice on diagnosing/fixing flickering monitor requested...

[Phil C.]

In addition to my previous message suspecting bad electrolytics, I am
doubting that you have multiple addressable LED blacklighting blocks or
areas, that is usually reserved for higher end LED TV's.  It is quite
possible that depending on the type of LED panel, that main  control of
areas of pixels with regard to led color and intensity are being misfired at
a higher frequency dependent on the frame to frame changes in the source
signal. Have you tested with a single static test pattern for each primary
color?  Then use some kind of progressively complex test video?  I am not
sure, depending on your type of panel how black is generated.

-----Original Message-----
From: Hardwarehacking
[mailto:hardwarehacking-bounces+charlestek=rcn.com at blu.org] On Behalf Of
Bill Bogstad
Sent: Thursday, August 01, 2019 11:32 PM
To: hardwarehacking
Subject: [HH] advice on diagnosing/fixing flickering monitor requested...

So this is a "linux" related hardware question only because the OS
happens to be Linux...

I have an older 4k TV (Seiki SE39UY04 39-Inch 4K purchased in July
2014) that I'm using as a monitor for a Linux computer.
Recently it has started to flicker in an odd sort of way.  It seems
almost like parts of the LED backlighting shut off briefly and then
come back on.  It is a very blocky flicker.   Some parts of the screen
will go from black to normal and then back to black multiple times.
While other parts of the screen are rock solid all the way through.
The regions that do "flicker" are always rectangular in nature
with very precise (looks like down to the pixel) boundaries.   It
seems like it is more likely to happen just after coming out of power
save mode and tends not to happen if the monitor has been used for a
while.  Any ideas on what kind of failure would cause this symptom and
if it might be possible to fix it?

Thanks,
Bill Bogstad

P.S. Amusingly, I purchased a 4 year extended warranty on the TV when
I bought it as I had no idea what the reliability would be for
an off brand like Seiki.  Of course, it only started to develop this
problem well after the warranty expired.  Given that the warranty was
from a third party provider (Square Trade), that is some pretty
impressive planned obsolescence.
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