I have a Full HD LCD LG tv, it is printed on the tv itself that it supports 1080p, but when I plug my PS3 and change the settings to 1080p, the screen goes black for about 5 sec, and comes back for 2 sec, it keeps happening all the time, when switching back to 1080i or 720p, it works perfect.

How do I get 1080 instead of 720. - Comcast Help and Support Forums

forums.xfinity.com/t5/XfinityTV-and.../How...1080...720/.../1152741

Jan 3, 2012 - I can switch one of them from one HDMI input to the other HDMI ... The YPbPr option might be set at 720p, and you can change that to 1080i.

How do I change the resolution on my LG tv to 1080p ? - Nvidia ...

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Tom's Hardware Guide
Apr 20, 2012 - 7 posts - ‎4 authors
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How To Change your PS3 from 720 to 1080p - YouTube

hi
There maybe some problem with your TVs resolution. ps3 outputs full hd high resolution video(1080p) through its HDMI. May be your TV is not supporting that resolution. Connect ps3's component video out to your TV's component video input and then try. if it ask for any resolution selection. select 720p or 1080i, above that resolution your TV will not support. Your tv is hd ready one, not full hd. ps3 's HDMI out is full hd (1080p).
or try this
Connect your ps3 to any full hd tv and then goto video setup of ps3. change resolution to 1080i (down scaling ). then connect to your TV via HDMI. surly u will get the video.
ok

Hi,
Sony is not capable to produce full HD 1080p to your LG. Just return back to previous setting , then.
Regards, Jay

hi,
ur ps3's HDMI out is a full hd video (1080p). if u r tv does not support full hd this problem can occur. do one thing. connect the ps3 to any full hd tv and go to its video setup, then down scale its video resolution to 1080i. after that connect the ps3 to ur tv. u will surely get video.
ok

hi
there maybe some problem with ur tvs resolution. ps3 outputs full hd high resolution video(1080p) through its hdmi. may be your tv is not supporting that resolution. connect ps3's component video out to ur tv and then try. if it ask for any resolution selection. select 720p or 1080i, above that resolution ur tv will not support. ur tv is hd ready one, not full hd. ps3 's hdmi out is full hd (1080p).
or try this
connect ur ps3 to any full hd tv and then goto video setup of ur ps3. change resolution to 1080i (down scaling ). then connect to ur tv via hdmi. surly u will get the video.
ok

Hello there. There's a few possibilities. First, the obvious, do you have it set to 1080P in the Display Settings options? Secondly, are you using an HDMI cable? You need to be using HDMI to play games in full 1080P. I use the component cables (The red, green and blue ones) for my PS3 and when I'm on the XMB (that's the PS's desktop so to speak) it's displayed in 1080P but games will not play in 1080P, only 720P. Any old HDMI cable will do the trick, so don't get suckered by the price if you are going to pick up a cable!

I solve it already my problem by connecting my ps3 to an 32 inches lcdtv and I change the videosetting to my ps3 to default setting because before when I had my sony bravia 32 inches I changed it to 1080p via HDMI cable signal...After I changed to default settings I connected it again to my own LG lcdtv 19 inches but it sadly 1080p is not so very much supported but anyway I can play now ps3 games...

one of your lasers in PS3 is probably bad

Most PS3 games do not support 1080p, so if u have a 1080p supporting game, only then can u do it. 

I have recently brought the same TV and had the same problem but I've mangaed to find a soultion.

The automatic setting for Blu Ray on PS3 is Full HD (1080p) but the Acoustic Solutions TV is HD ready (720p). For PS3 games it will automattically change settings for you to 720p. This is why this works straight away but Blu Ray doesn't.

Solution

You need to plug in your PS3 using the scart contection, then on the ps3 menu go to settings > display settings > HDMI. You will then need to attach the HDMI cable and manually set up
HDMI by checking the 720p option and deselect 1080p.

That should then play Blu Rays too. You don't lose too much quality as 720p works nearly as well as 1080p on smaller TVs.

Rich