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ZH (Unregistered Guest)
Posted From: 208.58.45.5
Posted on Monday, June 14, 2010 - 01:02 am:   

My Garmin Nuvi 750 suddenly stopped working. The touch screen is unresponsive and the whole unit freezes up. Everything works perfectly fine for the first 3-4 seconds that it's turned on, after that it stops working. If I turn it off and turn it back on, it works for 3-4 seconds again before freezing up again. I've tried resetting it by holding the power button for 8+ seconds. I've also tried pressing the bottom right corner of the screen. I've tried discharging it completely and recharging it. Nothing has worked. The computer is unable to pick up the device no matter how long I have it plugged in. The device still charges through the computer if it's plugged in, though.

Does anyone know what else I could try?
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Sharcnetusa
Username: Sharcnetusa

Registered: 12-2008
Posted on Monday, June 14, 2010 - 02:07 pm:   

The word "freezing" can be sometimes ambiguous. We've had customers say their units were frozen when in fact the problem was caused by was a non-responsive touchscreen. Pressing the power button (3xx & 6xx series) caused the units to change screens & beep, proving that the unit wasn't locked up at all.

When you mean it "works" for 3-4 seconds, what do you mean? Does it accept touchscreen commands or just power up? How far does it boot? Does it load maps? Do you reach the main menu screen?

More information is needed. Have you tried upgrading the firmware? I've seen units where the internal memory has been corrupted causing deadspots in the memory which causes the firmware to crash. Reflashing the firmware will often resolve those issues.

- Jim
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ZH (Unregistered Guest)
Posted From: 208.58.45.5
Posted on Monday, June 14, 2010 - 03:40 pm:   

I say freezing because the touchscreen works for 3-4 seconds. When it starts up, it automatically goes to the calibration screen(maybe because I have to reset it each time to turn it off). If I press all the dots within 4 seconds, it'll go to the next screen and freeze there. If I don't do it fast enough, it'll just stop responding after a couple dots. Even if I get past the calibration screen, it freezes at the next part(the loading part at the black screen) because the 4 seconds is up.
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ZH (Unregistered Guest)
Posted From: 208.58.45.5
Posted on Monday, June 14, 2010 - 03:40 pm:   

If it's plugged into the computer when it's first turned on, I'm able to get past the calibration screen by turning it off because it goes to the charging battery screen and sliding the power button again gets me to the normal "where to?" "settings" screen. Even then, I only have 4 seconds to do anything. I've tried doing it fast and pressing settings>restore>yes, to try to restore it to factory settings from there but that didn't work either. When I say it works for 3-4 seconds, I mean everything functions perfectly for the first 3-4 seconds it's on. After that, nothing works. Even the power button stops working after 4 seconds.
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ZH (Unregistered Guest)
Posted From: 208.58.45.5
Posted on Monday, June 14, 2010 - 03:41 pm:   

If I slide the power button to the left for 1 second when it first turns on, it'll turn off like it should. Once the time is up and it freezes again, the only way to turn it off is to hold the power button to the left for 8+ seconds to reset it. I hope that's enough information for you to get an idea of what I mean by it working. I can't upgrade anything because the computer doesn't pick up the device at all.

Sorry about the split posts, the message was too big.
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Sharcnetusa
Username: Sharcnetusa

Registered: 12-2008
Posted on Thursday, June 17, 2010 - 09:20 am:   

The reason why the computer won't communicate with the unit, is because the unit locks up before it can get to the routine that establishes communications.

The easiest thing to try is to reflash the firmware and you can still do this even though the unit won't comunicate "normally" with the unit.

There is a program called "updater" that will allow you to flash the unit (during pre-boot) with either a service firmware or the original firmare upon boot-up of the unit.

The service firmware is used for units that may have a corrupt file or files on the unit that cause the unit to crash. The service firmware tells the unit not to load in the corrupted files, which at least will then allow the unit to boot. Once the unit has booted, you can now communicate normally with the unit and rebuild/overwrite the file structure on the unit.

Once that has occurred, you can then reflash the firmware to the standard firmware using Garmin's Webupdater.
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ZH (Unregistered Guest)
Posted From: 208.58.26.241
Posted on Friday, June 18, 2010 - 06:04 am:   

Do you know where I would be able to find the "updater" program?
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ZH (Unregistered Guest)
Posted From: 208.58.26.241
Posted on Friday, June 18, 2010 - 06:38 am:   

I also can't seem to figure out how to enter pre-boot mode. Pressing the corners while turning it on; and holding the power button don't seem to be working for me.
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helen dennis (Unregistered Guest)
Posted From: 72.234.84.155
Posted on Friday, May 11, 2012 - 02:43 pm:   

need a 755 cradle. wheres the best place to get one. thanks

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