On my TV TV-led mode works normally, 8-bit RGB DV for all DV videos.
Your default GUI settings: Resolution, refresh rate?
log: dmesg|paste
Also please link on samples, bug description, steps to repeat for each issue you found could help to solve it.
P.S.: This issue FEL - Amlogic NO support - #156 by sat4all with conversion to DV will be solved in next nightly.