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Re: screen wont flash
It seems there is either an internal false contact in the LCD screen connector to in the mainboard, or moisture/water damage in it.
It is necessary to open to check it.
It requires a very skillful person to do it. If you have not experience with fixing electronic devices, then I do suggest you to send it to repair.
Besides that is necessary to open it, if is not done properly with the right tools, it's easy to damage the LCD screen assembly.
Also, if it's not opened right, is possible to damage permanently the mainboard if is bent or warped.
If still you want to proceed to open it, it will be easy to spot if the connector of the LCD screen is not firmly attached, or if there is residues of water damage (usually green or white dust spread in several parts of the electronics, causing electrical shorts).
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Hi. I assume that you plugged in your original battery after it was out a while. When your device's battery is drained, all the data in your device may be resetted (changes according to your backup battery's condition). So you should first try to plug it into AC power source for a couple of hours without touching it (Let the battery become usable enough). Then, your device should open without any error, but it may take a while because it will install the Operating System from ROM. In most cases, pluging out your battery won't destroy any internal parts of your device, it may just reset it to factory default settings. If there is an error, here is how you can hard reset your device:
HP iPAQ rx3715 Hard Reset: 1. Hold down the Mobile Media button (on the far left) and the iTask button. 2. Then press down the reset button with the styles for a few seconds until the screen goes dark.
3. To turn on your HP iPAQ after your hard reset, either press the reset button again, or plug it into an AC power source.
Hope this helps.
The dreaded "allign screen problem" strikes again. This is a known bug of these rx ipaqs. You should simply try to see if the ipaq passes this stage if you try to allign the screen a few times. If not, try a firmware update/rom update (from the hp site) If this woun't work then the problem is located on the motherboard,where a small chip called the touchscreen I/O controller has failed. This isn't fixable by replacing the screen, only the whole motherboard. Unfortunately most of the first generation rx 3715 units (first revisions) carried this problem just waiting to happen.
Please ask more details if you need to better understand any of these methods above.