Can internal TV/monitor PCB hardware change require repeat colorimeter profiling?



Quote:
Originally Posted by SCProCalibrator  /t/1518652/can-internal-tv-monitor-...re-repeat-colorimeter-profiling#post_24378027


I know that TV and monitor firmware updates can very much affect calibration and settings, but would they also require repeat colorimeter profiling even if the screen itself was not changed? For example, if you had a TV repair that included internal PCB or motherboard replacement, but no part of the screen itself was changed - would the old correction matrix/profile be just as accurate for the TV with a new PCB?

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Yes, maybe the new boards will change the characteristics of the display (you don't know this unless you have keep pre-service calibration report) but since you have a specto to your tools, it's better to run a new Four‐Color Correction Matrix with your colorimeter upon every calibration run. It takes 1-2 minutes.



Quote:
Originally Posted by SCProCalibrator  /t/1518652/can-internal-tv-monitor-...re-repeat-colorimeter-profiling#post_24378027


I know that TV and monitor firmware updates can very much affect calibration and settings, but would they also require repeat colorimeter profiling even if the screen itself was not changed? For example, if you had a TV repair that included internal PCB or motherboard replacement, but no part of the screen itself was changed - would the old correction matrix/profile be just as accurate for the TV with a new PCB?

Click to expand...

The main board usually holds internal (aka service menu) ADC and White Balance Settings (such as with Samsungs) and so changing it will alter the grayscale and possibly brightness/contrast as well.


I'm not sure if it would alter SPD (seems like the panel is more critical for that), but it would require different white balance settings (and possibly brightness/contrast).


Firmware updates shouldn't change ADC/white balance settings in the service menu, but it could still alter the calibration/settings in some ways as you noted.


The change in white balance, color gamut, etc. - that doesn't matter. What matters is whether the repair will affect how colorimeter reads the same display. In this case, it isn't repair, its installation of G-Sync module on LED TN monitor, which AFAIK also requires PCB replacement. The module actually improves color accuracy big time, but a LUT is still needed. This monitor required spectrometer profiling because my i1Display Pro was not accurate. It wasn't reading red properly. Spectrometer measurement was showing 106-109% red WB at any gray level while i1D3 was showing 100% WB at any gray level for the LUT I made with i1D3.

 

When a colorimeter table does not apply to a specific display, requiring a spectrometer correction, what is responsible for that behavior? Is it the backlight? Something in the pixels? Something PCB can control?