Question about Polar F11 Heart Rate Monitor

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I have a Polar F11. It is about 3 weeks old. I pushed the light button and the entire screen went black. All of the display keys are dark and the watch will do nothing else

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You have to change battery.

Posted on Mar 23, 2009

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How do i unlock my f4 polar?


Remove back cover,,,remove battery for 2-3 minutes,replace battery and allow unit to reset.

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Monitor does not light up at all.


Did she spill something on it? Have you tried to make sure it's not an issue with your bright and dark buttons or keys on the keyboard?

Shine a flashlight on the dark screen to see if you barely see the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works, then your screen is bad. If you see no icons by shinning the flash light and nothing shows on the external monitor, then most likely your video card is bad.

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push red button for 15-25 sec

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Polar F11F Error 16


you need to hold down all 4 or 5 buttons at once. This will reset your watch and bring up the message "welcome to polar fitness world". Press ok button 1x to start your setup process.

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A85 LCD stays off in all modes except "stitch"


Hi Toonz
I have exactly the same problem as Shimoni and Antonio with my 4 years old A85.
But sorry, its not a problem of the CCD, cause we all get a clear actual picture on the LCD but just in stitch mode! In any other shooting or playback mode the LCD is dark. So the sensor must be working well and Canon Germany doesnt repair for free. Our failure is different and we have to pay much more than the camera is worth ;-((
Dieter, Munich

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Black screen


Hey... friend,

It's seems your backlight inverter is burnt out...need to replaced a new inverter. Visit this site @ www.3rd-rocks.com There's a replacement parts for your FP988D LCD. Have a nice day!

Aug 05, 2008 | Fuji FP-988D 19" Flat Panel LCD Monitor

1 Answer

Laptop screen dark


Most laptops have a function key that allows you to use special color coded operations. Usually these are in blue on the keyboard. Look for on that shows a picture of two monitors side by side. One will have a sun in it. Try pressing and holding the function key and then tapping this two monitor key. This option is suppose to allow you to activate a second monitor or a projector for presentations.

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5 Answers

Screen went dark (almost completely)


check your power cord and make sure it's plugged in all the way, and if it is, check your brightness setting.

Usually it's the Fn key + an arrow key. Make sure the brightness is up all the way

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1 Answer

Monitor Black, Green Power Light Flashes Monitor is 4 yrs. old


Assuming you've already checked your driver and system settings, tried a different monitor, and checked the cable and connector pins, this would almost certainly be a problem with the power or signal circuit board inside the monitor.

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