i have a phillips 16 tv (4x4) video wall. everything works except when i power it up sometimes randomly one tv wont power on.
its happens randomly and with a random tv sometimes tv 4 sometimes tv 8 sometimes tv 11 etc. it has all the proper rs232 and ir cables routed in to out etc. sometimes it will turn om just fine. even when using the phillips remote to turn them all on it still happens funny thing is after like 10-20 mins the tv will turn on.
all tvs have the same settings i cant figure out what is going on.
Could it be a power draw upon startup on the circuit? ive reached out to phillips and they are stumped as well so any help would be greatly appreciated. Also if i turn on video wall and one tv does not come on ad like 5 min later i just turn the wall off after that same time frame as abouve ill come back in the room and the tv that didnt turn on will now be on

How are you controlling the TV's?

Is CEC enabled? If you are using individual IR control for each set, is it possible that there is some IR command spill between TV's or TV video output is interfering with IR reception? Are you exclusively using RS-232 for control?

If CEC is enabled, I can imagine that with 16 TV's the CEC is simply overwhelmed.

Thanks for the reply. Cec is turned off on every just add power device behind each tv. And it’s IR and soon to be IP control going into 1st tv only then daisy chained rs232 from 1st tv to the others

Hoping the IP control gives more stability...

Fred. That’s what I’m hoping too. Lol.

It sounds like the problem is in the RS232 loop.
I think the odds are against you, that switching the initial control type from IR to IP is going to have any change on this. Hopefully I'm wrong.

Are you using approved cables for the RS232 interconnects? Proper lengths between each TV? I'm thinking this could be a capacitance problem on the cable.
I don't have a lot of RS232 experience but I have always heard from experts that do, capacitance on an RS232 run can wreck havoc and cause weird things to happen.

I’m using the rs232 cables that came with the TVs. From Phillips

I’d double check the ID’s of each display and certainly change from IR control to either 232 or IP.

TV ID’s should match the order that the displays turn on or off in the chain. I’d also advise to setup a turn on delay for each TV, 5 seconds between each is a safe bet typically, maybe longer. That way the inrush current will not affect the circuit and insure all displays will receive the power commands properly.

Thanks I will try that delay setup. I have them all ID correctly. But the turn on delay sounds promising. Thank you

So the delay didn’t help. And tv 4 is still doing its 5-15 minute turn on. And today tv 11 wouldn’t turn on at all even with its remote. I’m pulling my hair out with this problem. Phillips says to factory reset. And if that don’t fix it then new TVs are needed. Does anyone have any history with Phillips video wall TVs. 2 TVs out of 16 seems to worry me if they are bad. And a third had to have the keyboard turned off on the menu because it was operating itself and switching inputs and going through its menus in a random order. Lol. I’m starting to lose faith in the TVs. Anyone ever in counter these problems?

Can you physically swap TV 4 with another - change the IDs and see if the issue follows the TV or the wiring/programming?

i can swap them but the wiring is just the phillpips daisy chain ir and rs232 cabling the control programming only deals with tv 1 and then tv 1 sends its commands downstream through the daisy chain
and if it was a wiring issue then the tvs that follow the bad tvs wouldnt work either

So update. Electrician had one 20 amp breaker on entire wall also 2 85 inch TVs. And 4 local outlets. Once he put the video wall on its own 20 amp circuit all problems went away. I asked for 2 20amp circuits during the build. But I guess that was ignored. But after he did his thing the wall is behaving as it should

Glad to hear they were able to add power!

I do hope you logged all your hours of troubleshooting from start to fix. And are billing them accordingly.
You gave a specification for (2) 20 amp circuits and it was ignored (or overlooked). Either way, this caused extra expense.

You better believe if something similar happen to any other contractor, they would be charging bank! You should NOT be any different.