I have a Asus ML238H, when i plug the HDMI it doesn't show anything just blue screen with no signal HDMI and once time its show out of ring. i try VGA its work will but i need to know what is the problem with HDMI ?

Doesn't the manufacturer have a toll-free help line that you can call with questions? Try this RCA phone number: 1-800-968-9853.

The main board is out.

do you have anything plugged in to it? the blue screen just means its not getting a signal. cable tv, roku. try switching between your inputs tell you see something on screen. hdmi. cable. you might also have to auto program for cable tv

Have you checked these?
1. Input settings in the TV,
2. Cycle the laptop output (laptop screen, external screen, both)

you may need to change the HDMI board in the tv. it will be the hole board the parts are just to small to replace them all to get the HDMI board working again. find a second hand replacement. should be fine with another known working one.

It sounds like yoru PS3 has stopped handshaking with your tv. It can happen. It's possible your brother disrupted the connection by unplugging the PS3 before it was shut down. You can try turning on the PS3 first, and then turning on the tv, or vice versa. If that doesn't work, you may need to invest in a cheap HDMI splitter, to plug the PS3 into, and then send the signal from the splitter to the TV. It has happened to me with a computer with the same hardware, once with an LED tv, and once with my surround sound receiver, completely out of the blue. You can try switching HDMI cables, sources, doing putting the tv into maintenance mode and resetting the software. If none of that works, your only option may be to use an HDMI splitter. I did extensive research and read numerous reviews before I settled on this model, due to many recommendations:
ViewHD 2 Port 1x2 Powered HDMI Mini Splitter for 1080P & 3D ' Model: VHD-1X2MN3D
It's available on Amazon here:
Amazon com ViewHD 2 Port 1x2 Powered HDMI Mini Splitter for 1080P 3D Model...
Just in case your HDMI cable was damaged when your brother unplugged it, go ahead and get yourself a decent HDMI cable. The Amazon HDMI cables work just fine.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/reginald_bec291de192ca44f

i have the same problem!
AT5IONT-I, Win7pro,4G, bios 0502

tried many screens, nvidia driver versions etc.

hdmi only works in single monitor configuration. hdmi blanks on detection of dvi monitor. argh!

Tries tv and cables boxes uplug,replug it back like about an hour later for the tv resetting itself back to the factory setting and those pay boxes updated it softwares.Take the HDMI cable plug it in into another tv HDMI hub.Tv should have signal and work again.

hit the back panel. I have the same ty and it's the only interface to the inside ..no coaxial cable , no hdmi or nothing ...this was made out of pure stupidity!

Have your tried a different plug HDMI plug on your TV? Maybe bring your PS3 to a friend who has HDMI and try it on his TV. What about a diffferent HDMI cable?

Could also be your HDMI on your PS#, but try these other simple tasks first.

Good Luck