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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DTC B2645 Ambient Light Sensor Circuit
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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

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Turn the headlamp switch to the OFF position.
Do the low and high beam headlamps remain OFF?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
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Remove the appropriate low or high relay.
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Anonymous,
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I’m happy to assist further over the phone at https://www.6ya.com/expert/barbara_87cfe34e34050f26

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If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
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I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

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      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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