Over the last few weeks we have been contacted by several integrators regarding compatibility issues with HDBaseT products and all new Panasonic 4K screens. The problems are associated with the HDBaseT chipsets and effects the majority of manufacturers who use this technology platform.
The feedback from engineers and other HDBaseT alliance manufacturers is that the Panasonic screens suffer from a problem that is know as 'clock stretching’. This is the HDMI and EDID information that is carried on the DDC channel. For further explanation please see recent article written by CEPRO:-
From reports in the field this appears to be latest 4K Panasonic screens. A list of several screens that this fault has been witnessed include Panasonic TX-40CX700B, TX-42AS700, TX55CX700, TX-65CX700, TX-55AX902B (and other sizes in this range), TX-40CX680B and TX-55CX740A.
By installing the Blustream HD11AU at the end of the signal chain and connected from here directly into display we are managing the HDMI EDID which resolves the clock stretching issue. This has been tested directly from source and out of Blustream matrix outputs.
We would recommend setting the HD11AU to be an signal end point (mode dip-switch 1 set to 1). The HD11AU can be set to either an end-point in the HDMI signal chain or as pass-through. In both setups the HDMI signal is stable.
EDID dip-switch settings have been tested @ 4K, 1080P and 1080i so is dependant remaining other display devices in your system. Blustream recommend 1080P 2ch as default – see below photo for setup.
The HD11AU is a powered product and requires 5V 1amp supply. We would recommend using supplied power adaptor but have also tested running this from the USB 0.9A 5V power supply of the Panasonic screen and HD11AU has been stable.