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Old 05-21-2022, 10:50 AM   #1
Join Date: Jun 2016
City & State: Stockholm
My Country: Sweden
I'm a: Knowledge Seeker
Posts: 95
Default Philips 70PUS7505/12 - Contrasts in image are echoed vertically upwards

My mother's Philips 70PUS7505/12 TV suddenly began to display this kind of behavior:

Contrast differences from a light area to a dark area above, become "echoed" vertically upwards.
It's the same behavior with all colors as long as there is a relative contrast difference between them.
There are no other issues; the backlight works fine, the Error code buffer is all zeros.

I tried it on each HDMI-input, the result was the same.
I tried in another resolution, still the same.
I tried with three different sources; tv-decoder, media player, laptop, no difference.
I tried fiddling all the picture-related controls on the TV, but nothing had an impact on the problem.

The back label says:
Model:      70PUS7505/12
Serial:     FZ3A2101052xxx
Set Option: 016
Chassis:    S TPN20.6E LA
The service manual is available here.
The troubleshooting flowchart in the service manual shows:

The flowchart suggests updating to the latest software when experiencing a picture-related issue which is non-intermittent.
There was an update available, so I installed that but the problem still persists without any difference.

Does anyone have an idea what kind of problem this is even?
Is it a known problem with this series of models?
Is there a service notice about it from Philips or something?

Thanks in advance!
Attached Images
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File Type: jpg Close-up.jpg (1.60 MB, 50 views)
File Type: jpg CSM1.jpg (929.1 KB, 50 views)
File Type: jpg CSM2.jpg (947.3 KB, 51 views)
File Type: png Service_manual_troubleshooting.png (40.2 KB, 65 views)
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