Yes, all these TV sets can handle 1080i50 ( or 1080i25 in other words ).
Hot Plug Detect (HPD) pin on HDMI connector ( or pin 30 ) is in Low level when HDMI cable ( tried different ones ) is connected from the board to these TV sets which do not identify the HDMI signal we are talking about.
So, the TMDS clock is also in the Low level and there is no picture ....
If LG-M2252 TV set is connected to the board, then state of Hot Plug Detect (HPD) pin ( if touched by scope's probe ) slowly goes down from ~2,5 V and stabilizes at ~ 1 V ( which is below 1,2 V !).
The schematic is as in the "Dual ADV7612-ADV7511 Evaluation Board", but without LED and C55 capacitor.
Here is the info about Hot Plug Detect (HPD) from ADV 7511 HARDWARE USER’S GUIDE:
Hot Plug Detect signal input. This indicates to the interface whether the sink is connected.
1.8V to 5.0 V CMOS logic level.
The Hot Plug Detect (HPD) pin is an input which detects if a DVI or HDMI sink is connected.
If the voltage on HPD is greater than 1.2V, then the ADV7511 considers an HDMI/DVI sink is connected.
If the voltage is below 1.2V, then the ADV7511 considers no sink is connected.
The HPD must be connected to the HDMI connector.
A 10KΩ (+/-10%) pull down resistor to ground is recommended: this ensures that 0V is present on the HPD pin when no sink is connected.
In my case I have no 10K pull down resistor to ground since it wasn't present in the above schematic.
But, could this be the cause of the problem?