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We've repaired it dozens of times and it's usually caused by a defective screen (backlight power circuit broken). Screen is easy to replace, part is available on ebay. Free DIY guide is here: http://www.portatronics.com/guide. Third party repair Service is here: http://www.portatronics.com
There are screws in the rear corners of the case, take these out, and the case will unclip, use a very thin blade or the like and slide it in between case halves, where the colors meet, and carefully twist it apart.
Undo the 2 screws (Torx7) on the back of the case. This allows the top of the screen to be pulled forward by slipping a fingernail under the screen bezel and gently pulling. Move from top corner to opposite top corner of the bezel and gently ease the screen out of the case. Be careful as there are 2 plastic clip devices about two thirds down the screen. Ease these two plastic clips with your fingernails. Do not pull on the screen as it is attached via a stiff ribbon cable to the board beneath it and this board is still screwed to the case by 4 screws. By very careful manoeuvring, position the screen on each and every occasion so that all of the 4 black screws (Torx7) can be undone without pressurising the stiff ribbon cable connected to the screen unduly. This releases the board from the case, be careful with releasing the on/off switch as you ease the board out of the case. On the back of this board is the battery, a rechargeable Lithium Polymer 3.7v 1300mah. The battery is obtainable from suppliers using the internet is a good start. The battery is stuck to the back of the board, so it is a question of easing it off and replacing it. Double-sided sticky pads work well. Finally, replace the board back in the case, not forgetting to engage the on/off switch and screw-up the 4 screws. Do not over-tighten and do not put undue pressure on the stiff ribbon cable connecting to the screen. Then replace the screen gently and re-tighten the 2 screws on the back of the case. Place Tomtom 920 in it's charger for 10 hours. This is a slightly fiddly job that needs patience, care and a gentle touch. If you do not have these qualities, please don't attempt this.
repair both ...start fresh from start.....do a hard restart on the TomTom...this is located on the last menu of your tomtom...Factory reset...it will erase recent destinations and favorites....but it usually clears the tomtom....Now try to repair both the phone and the tomtom