Question about HP iPAQ HX4700 Pocket PC

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Automatic Brightness Issue

Does the ambient light sensor on the hx4700 only adjust a certain small percentage depending on light conditions. Mine only adjusts a very small amount up or down. Is this normal?

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The automatic brightness feature is useless to me because of two reasons. First, it is too dark to start with. Second, it does not respond as fast as I like to see. I end up using only two default settings- Battery or AC mode.

Posted on Sep 12, 2005


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Posted on Jan 02, 2017


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What are the two lights on the window dash

The one that flashes indicates that the car's security system is functioning properly (not necessarily that it is locked, though). The one that doesn't light is a sensor for ambient lighting conditions. It is used to turn on/off automatic headlights, or to adjust interior lighting for appropriate light levels, depending on how the manufacturer has it set up.

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Daytime Running Lamps (DRL)
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) provides a 5-volt reference signal to the ambient light sensor. The ambient light sensor is permanently grounded at ground G202. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions the BCM will command the low beam headlamps ON at reduced intensityy. Any function or condition that turns on the headlamps will cancel DRL operation.
There could be a DTC stored in the BCM pointing to a problem !
DTC B2645 Ambient Light Circuit


Turn the headlamp switch to the OFF position.
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Why do my tablet screen black out or so dim i cant see it

Usually mobile devices such as smartphones and tablets have built in sensors which by factory are set to adjust brightness depending on lighting conditions on your room in order to preserve battery life.

On android devices you can deactivate this feature going to Settings - Display - Brightness - remove check from "Adapt to lighting conditions"

Oct 18, 2014 | Tablets & eReaders

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Dell Latitude e5410...brightness changes from dim to bright on it's own. Not using battery powered. What could be going on?

Press the Fn + Left arrow key on laptop keyboard to disable Ambient Light Sensor to see if that will resolve the issue. Follow the steps in article to adjust the brightness manually.
Thank You,
Dell-Jesse L
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Oct 02, 2014 | Dell LATITUDE Computers & Internet

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My htc has a dark screen and still works and by dark i mean you can barley see any thing but sometimes the screen goes back to normal light

Is your phone a smart phone?? Does it have something called ambient light sensor (light sensor).??? Check your phone manual. If that is the case then you can turn it off. Ambient light sensor is a function that senses the light outside and automatically adjust the brightness of the screen. But sometimes it goofes up. So you can go to settings> display settings> brightness> if it is auto then turn it to manual as per your convenience. Again depending on your phone model the settings may vary. I hope this helps.

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The picture is very dark and want to brighten it

If your keyboard doesn't have a brightness control button (mine is F6), open System Preferences and click on the Displays control panel. Move the brightness slider to the right to increase brightness. If you don't want the computer to automatically adjust brightness uncheck the box next to Automatically adjust brightness as ambient light changes.

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Monitor dims and brightens constantly

This is because of the ambient light sensor. You can turn the option off in System Preferences>Displays>Automatically adjust brightness as ambient light changes

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Screen flickering

Not sure if this is your issue, but when the brightness is on full with AC plugged in, the ambient light sensor isn't as sensitive. Unplugged, it is. The ambient light sensor judges the light in the room and responses by automatically adjusting the brightness. What you could be seeing is your shift in movement blocks/allows more light to the sensor (the camera at teh top) and thus adjusting your brightness. To disable system preferences> display> uncheck "automatically adjust brightness.

Also, it may be the LCD, If you are in warranty, bring it to your local Apple store for repair.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

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Did you recently reload Windows? It sounds like you don't have a proper driver or utility program for your camera.
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My acer aspire 9300 screen is so dim i can barely see anything


      Have you tried adjusting the Brightness of the Display? May seem like a stupid thing to ask, but some laptops come with what is known as Ambient Light Sensors and by setting a higher brightness level it Disables the Ambient Light Sensor kicking in.

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