Do not know the brand for the cable. The person who setup the projector - I took it on his goodwill for around 3k. I talked to him and he is ready to replace the cable if there is any fault with it. This person has done projector installations at my office, so I got good price - he claims he didn't make any money on my transaction. Did it only because of relation with the company.
The person who brought the installation stuff removed the packing before getting it to keep his load minimum as he was riding a bike (or he could be taking me for a ride by giving this stupid reason).
I watched some TV (tata sky over composite) - there was no flickering. I am pretty sure it is not an iris issue - as yet. My projector is still clean.
Then I switched DVD player to my older to philips 5986 and watched two movies. No flicker at all. Eliminates both cable and projector out of the issue.
Then I brought back the philips 5996 DVD player, connected everything properly and watched same DVD for 10-15 mins. No flicker at all. I thought everything is fine it was just a loose connection.
However, last night I again faced the flicker issue with the 5996 dvd player. Frequency was much lesser than the earlier. Saw it only twice (blue screen - projector thought it lost the signal - normal flickering couldn't be noticed) while loading a movie. Could not spend much time, but in 20-30 mins I spent, the issue wasn't as bothering as it was earlier.
Culprit seems to be either the DVD player, or the connection with this DVD player - maybe it has dust etc in the hdmi slot.
Will test more. Some family members would be coming over on Sat to watch movies and will delegate some testing to them
Some notes - I was watching movie/ TV and as soon as tubelight was turned on, the image got washed out. I was watching in normal mode. I hadn't tried the most bright modes on this projector critically as yet - since turning off light was easier. This time it wasn't an option, so I turned to dynamic mode, and suddenly image was so bright I wasn't bothered by the light. Blacks were still washed out, but no projector can throw black light - they can only cut off light to show black areas. I think I love my projector
Maybe some day I would be able to mod it to 1080p by purchasing LCD panels as spares. The projector inherently accepts 1080p/24 signals. I assume the lower resolution is only because of the resolution of the LCD panels.
regards