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Using protron as a monitor with mac

I have a mac computer, I set up my protron as monitor but it now shows "invalid mode" in the VGA mode.  How do I reset?

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Re: Using protron as a monitor with mac

Need to set resolution and refresh rate on the Mac before plugging in to the TV set - had this same problem with a WinVista machine. According to the documentation, the only supported resolutions are:

640x480 60Hz
800x600 56Hz
800x600 60Hz
1024x768 60Hz
1280x1024 60Hz
1280x768 60Hz
1366x768 60Hz

In all fairness, I cannot get the unit to run in 1366x768, though - get out of range. 1360x768 seems to work OK though. Only real problem with the VGA input is that regular text mode on a video card (more of an issue on Windows machines) does not work.

Posted on Nov 29, 2007

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How do I see VGA in put on screen

First, is the TV the only connected monitor? Second was the TV on and set to VGA (press the Input button and then up/down arrows) before the computer was turned on.

If you are seeing an invalid mode message and the TV is the only monitor attached, you need to shut down the computer and leave the TV on the VGA input. (Turn off the computer or press CTRL-ALT-DEL twice.) If this doesn't work, you may need to use another monitor and adjust the resolution output for the computer's video and then connect to the TV.

If you have another monitor, you may need to make sure that the VGA port is enabled. (Some laptops will have this disabled in the BIOS. Depending on the brand of computer, you can access the BIOS by pressing Esc, F1, F2 or F10 repeatedly just as you turn on the computer.) Next you may need to adjust the active display. In Windows 7, right click on the desktop where there are no program icons or windows. Then select Graphic Properties. Set the computer for monitor 1 or 2, extended display or both (at least on my HP laptop). Click Apply and then confirm your . (alternatively: Start > Control Panel > Appearance and Personalization > Display) For my desktop, this is set under Screen Resolution in the same manner.

I hope this helps.

Cindy Wells
(at least on all of my computers, if the TV is on first, Windows 7 will autoset to the best resolution that the graphics and monitor can handle.)

Apr 19, 2011 | Dynex 32 in. LCD Flat-Panel HDTV

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I am trying to connect my LCD Hi-def television to my computer so I can watch internet on my tv. The tv is showing "invalid signal". What is this and how do I fix it? I have the dynex DVI-D to...


You can only use your TV for viewing internet from your computer by using the TV as a PC monitor. To do this you should connect your computer to your TV using a standard VGA cable - the same as you would use to connect your computer to any other external monitor. You should note that this cable doesn't carry a sound signal so you can't use the TV speakers for sound output.

However, you can connect an HDMI cable from your computer to your TV to play media files or DVDs. This cable does carry a sound signal so you will be able to use your TV speakers here. This cable cannot be used for turning your TV into a PC monitor.

And all of above shouldn't be confused with "Internet TV". This is something totally different and requires your TV to be connected directly to the internet.

Hope this helps.

Nov 07, 2010 | Sony BRAVIA KDL-V32XBR1 32 in. LCD HDTV

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Connection with VGA cable to pc says "invalid mode" Help plz!!

You PC video card resolution is too high for it to display, you need to set your PC video resolution to the native resolution of this TV.
1366 x 768 @ 60 Hz

If your TV goes out and it will, please read below:
Check the power supply; look for bad caps with leaking/bulging tops, check to see if you have standby +5vdc at the power supply connector, the front red indicator will not be on if you do not have this +5vdc standby voltage due to shorted out Q7 and ZD4.

Power supply:

Oct 21, 2010 | Protron PLTV3250 32 in. LCD Television

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Invalid mode is on a blue VGA input screen with laptop plugged in, why?

It is becuase your PC video resoliton is too high for this TV to display, max resolution for the PLTV3250 is 1366 x 768 @ 60 Hz.
Also watch out for this TV power supply to go out due to bad caps and it will take out the transistor and Diode with it.

Jun 02, 2010 | Protron PLTV3250 32 in. LCD Television

2 Answers

Trouble connecting Insignia HDTV 19" to my macbook pro

One of the first things you may notice about your new big-screen HDTV is that it has more connections for video than your old TV ever dreamed about. It probably has two or three HDMI connections, maybe a DVI connector, a VGA connector, and at least one component video connection. And those are just the connections most commonly used for high definition.
It’s shame to let all those connections go to waste. Your Mac just happens to be sitting nearby; why not hook it up to your new HDTV? It's actually a pretty easy task. A few lucky souls won't even need an adapter; for the rest of us, at least one adapter will be necessary.
Pick the Right HDTV PortFor best quality, your HDTV's HDMI or DVI ports are the preferred connection method. Both are capable of the same digital quality. The only practical differences are the style of the connector and the fact that HDMI supports video and audio in a single connection.If it has one, another option is to use your HDTV’s VGA port. The VGA connection isn't as good as the HDMI or DVI method, but as long as your TV supports full resolution via the VGA port, you'll be hard pressed to notice the difference.Mac Pro, MacBook Pro, Mac MiniMac Pros, MacBook Pros, and Mac Minis have standard DVI connectors. Mac Minis and MacBook Pros have a single DVI port; Mac Pros have at least two DVI ports.If your HDTV has a free DVI port, then all you need is a standard DVD cable; no adapter is necessary. But in all likelihood, you'll need to connect your Mac to your HDTV using either an HDMI or VGA connection; both options require an adapter. If you choose VGA, you can use the adapter that came with your Mac.If you choose HDMI, you'll need a simple adapter, which is available from multiple sources. The adapter may be a cable with a DVI connector on one end and an HDMI connector on the other, or it may be a small adapter that has both types of connectors, but no cable. Either type will work fine.iMac, MacBookiMacs and MacBooks have a mini DVI connector for hooking up external monitors or TVs. You'll need at least one adapter, maybe even two. At a minimum, you'll need a mini DVI-to-DVI adapter. You may also need a DVI-to-HDMI or DVI-to-VGA adapter, depending on which port on the HDTV you choose for the connection.Make the ConnectionOnce you determine which, if any, adapters you need, and have the necessary cable to reach from your Mac to the HDTV, turn off both the HDTV and the Mac. Connect the cable between the Mac and the HDTV.Turn the HDTV back on first. It doesn't need to be set to the connection the Mac is on, but it must be powered up first, so that when it boots, your Mac can recognize the TV and the resolution it needs. Once the HDTV is powered up, turn on the Mac.Your Mac should recognize the format and resolution of the TV, and automatically select the native resolution of the TV for running the video. In a few seconds, you should see the Mac desktop on the HDTV.Over or UnderscanYou may notice that the Mac's desktop appears to be slightly larger than the HDTV's screen (its edges are cut off); this is called overscan. Or, you may notice that the desktop doesn't occupy all of the HDTV's screen real estate (there are dark areas around the edges); this is called underscan.You can usually correct either issue by making adjustments on the HDTV. Check the HDTV's manual for information on making scan-related adjustments. They may be called overscan, underscan, dot-by-dot, or pixel-by-pixel. If your HDTV has a dot-by-dot or pixel-by-pixel capability, give this a try; it should eliminate any over or underscan issues. Some HDTVs only offer these special scan controls on specific inputs, so be sure to connect to the corresponding input on your HDTV.Time to Watch a MovieOnce you have your Mac and HDTV working together, it's time to kick back and watch a video from your Mac. Be sure to check out the QuickTime HD trailers for a sense of what HD and your Mac is capable of. Enjoy!

Feb 22, 2010 | Insignia 19 in. Widescreen Flat-Panel LCD...

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Invalid format message when trying to use the RGB(PC) port

Honestly, that sounds like one of two things happened. Either the resolution of your computer video card changed or (I'm not sure with your specific TV) the TV's resolution changed.
If through the TV menus you can adjust PC resolution, I would try changing the resolutions. In the LG 47LB5DF TV, press Menu, then go to Picture, then go down to Screen. On the screen menu, you will see Resolution, Position, Size, Phase, and Reset. First try adjusting the Resolution to some of the options you see. If that doesn't work, try to reset the screen settings.
If adjusting those settings on your TV does not help, then you will have to change the resolution through the computer. Try connecting a monitor to the computer. If you get a picture through the monitor, on the desktop right click and select Properties. If using XP go to the setting tab, if using Vista/7, select Display Settings. Lower the resolution to something you think the TV will be able to handle, then connect the PC to the TV again. If you are using an HDMI connection to the TV, you may have to turn off the computer, connect the cable, then turn the computer back on with the TV on the correct input.
If the monitor doesn't show the picture or if you don't have another monitor, you can try adjusting the picture in safe mode, by pressing F8 after you press the power button, before you see the Windows loading screen. Press if multiple times if necessary. You should see a screen that gives you a few startup options. Select Safe Mode. After Windows boots up, you should still see the screen as the resolution would have been reduced. From there try changing your display settings.
Hopefully that info has helped. I noticed that you asked this question 2yrs ago, so I hope you have already figured out how to fix your problem. I simply wished to post this in case it would help you or anyone else had a similar problem. Good luck and take care.

Dec 15, 2008 | Philips Magnavox 42MF521D/37 Television

2 Answers

Akai 32LW7 _connection to Laptop


I believe that you have connected it correctly since the Windows log-on is displayed. It may be that the Screen Resolution of your desktop is a bit high and therefore would have to be lowered to match the capacity of the Akai 32LW7. Pls try 1366 x 768 pixels or lower. You could also lower the laptop's screen refresh rate. Additionally, some laptops have to be toggled to activate external VGA by pressing Fn + F? keys to cycle through LCD, LCD + external, External only. The F? key would be the one with the monitor icon.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Oct 31, 2008 | Flat Panel Televisions

2 Answers

LG 37LC7D Connect to VGA from a PC

Your right. I just had the same "Invalid Input" issue as well and it completely relates to the resolution compatability with any VGA or HDMI connection. Check the LG website for the online manual if you don't have it and see the section on RGB-PC cable. There is a table that incdicates the Resolutions the LG product is capable of displaying.

Thanks for the help.

May 20, 2008 | Flat Panel Televisions

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