If you have not checked yet, to see if the TINT adjustment is available in other INPUT modes - using other (active) signal inputs - I would do that to see IF the adjustment becomes available in those other modes.
IF the TINT adjustment IS available in ANY input mode - but becomes unavailable (grayed out) when using HDMI input - that tells us that this is a "programmed setting" within the unit itself. What I mean is that MANY multi-input devices have certain adjustment that CAN NOT be made in a particular mode (such as HDMI or COMPONENT).
This is usually because the manufacturer has "designed" the controls to operate in this fashion - so that ONLY the programmed settings can be used OR the input device (what is driving the HDMI signals) is in control.
NOTE: It is VERY COMMON for display devices to behave this way - especially in the "less expensive" units (it is a cost saving design).
I hope this helps explain what is happening on your unit.
Please let us know if you have any more questions.
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