Hi everyone,
I’m fairly new to the Formuler ecosystem and I’m hoping someone here can help clarify a few HDR quirks I’m still trying to understand, especially with the Philips 55OLED935/12.
I’ve got the Z12 Ultra mostly stable now after a lot of trial and error, but HDR behaviour is still inconsistent compared to the TV’s native apps. SDR looks great—no complaints there—but HDR via the Formuler sometimes appears noticeably darker/duller than expected, especially in YouTube and other streaming apps.
So far I’ve tried:
- Latest firmware on both Formuler and the TV
- Full shutdown + power-cycle after every update
- Factory resets (TV + Formuler)
- HDMI port swaps (this often temporarily restores proper 4K/HDR capability)
- Verified HDMI cables + ports
- Ensured HDMI mode is set correctly (where available) - I've checked as many guides online as I could.
Interestingly, switching HDMI ports on the Philips seems to force the TV to “re-handshake,” and after that, the Formuler’s Display/HDMI menu finally shows all the options again (4K60, HDR, AUTO, etc.). After a crash or app freeze, though, it sometimes reverts to basic 1080p/no-HDR mode until I repeat the process.
My main questions for anyone with similar setups:
- Does the Philips OLED line (especially the 935/12) require specific HDMI settings for Stable HDR10/HDR10+ with external boxes like the Z12?
I’ve checked settings like:- HDMI Mode / Enhanced Format
- Ultra HD settings per port
- HDR tone mapping
- Colour space control
- Automatic vs forced “HDR Always On”
- Is there a recommended HDMI cable spec for the Z12 Ultra to avoid handshake resets?
(I’m using 48Gbps certified cables which usually work flawlessly with PS5, so I don’t think cable bandwidth is the issue.) - Does the Z12 Ultra output YouTube HDR properly?
Sometimes it looks like SDR flagged as HDR—black levels lose detail, whites dim out, overall picture goes darker. On the native Philips YouTube app, HDR looks better. I'll try to get pics later on. - Could this be an issue with Formuler’s HDR tone-mapping vs Philips' dynamic tone-mapping?
The TV’s own processor (P5) is usually very aggressive in adjusting HDR brightness/contrast, so I’m wondering if the Z12 Ultra is sending metadata the TV isn’t interpreting correctly.
If anyone with a Philips OLED or similar Z12 setup has found the “magic combination” of HDMI and HDR settings that keep everything stable (no resets, no handshake loss, consistent HDR), I’d really appreciate your insight.
Thanks in advance!