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SHARCNET-USA

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SHARCNET-USA is owned and operated in the United States of America

** Attention Nuvi 6xx Owners with Lifetime Map Subscriptions! **
Don't throw your unit away! The factory may no longer support this model but we still do!
Let us repair your 6xx and keep using your lifetime map subscription!

Read why SHARCNET-USA believes that the Nuvi 6xx is a still as great GPS. Click [HERE]
SHARCNET-USA - The 6xx Experts
Dale in Gilbert, Arizona wrote us about his repaired 660: "Looks wonderful! Works great!
You took this from the trash heap and turned it into a working machine again. Thank you so much"


Figure #1: Front View - 3.5 " Liquid Crystal Display

Figure #1: Front View
3.5" Liquid Crystal Display
(Cracked/Broken)

  • Accidents Happen

  • You’re driving down the road and suddenly your suction-mount falls from the windshield and your GPS hits the dash.

    You set your GPS on the front car seat and forgot it was there and accidentally sat on it.

    You're at your front door, juggling for your keys and the next thing you know, your GPS falls out of your hands and hits the sidewalk.

    You reach for your GPS and look at the screen. It looks like a shattered windshield. You turn it on and find either it no longer lights up or half of the screen is missing or its all just a bunch of random pixels.

    These are typical situations that we have seen time after time on units that have been sent to us for repair.

  • Unexplained Touchscreen Behavior


  • You go to press a function on the screen but it accesses another function either above, below or to the side of what you actually pressed. You recalibrate the screen and everything works for a while but then later happens again. This is called a "drifting" touchscreen.

    You go to press the screen and nothing happens. The touchscreen doesn't seem to be responding to your touch. It appears that your GPS has locked up - but has it really? Read on and let's see what's really going on. You might have what is called a "non-responsive" touchscreen.

    The Display of a GPS Consists of (2) Separate Devices that Work Together.

  • The Liquid Crystal Display (LCD)
  • The Touchscreen with Glass

    The touchscreen consists of several transparent layers with spacers that are applied with an adhesive to a thin pane of glass. The touchscreen & glass lies on top of the LCD display. The touchscreen & LCD display both have their own flex cables that connect to the main board.

    Figure #1-1A: Touchscreen Diagram

    Figure #1-1A: Touchscreen Diagram


    The touch screen has a ribbon flex cable with 4 or more conductors, each conductor representing a direction such as:

    1. X-Coordinate, Left
    2. X-Coordinate, Right
    3. Y-Coordinate, Up
    4. Y-Coordinate, Down

    Most GPS units use a resistive, analog touchscreen. A voltage is appled to the touchscreen and by pressing anywhere on the touchscreen, it acts like a voltage divider, returning a specific voltage value, based upon the location touched on the screen. The GPS is programmed to read this voltage and it translates it back to a specific position on the screen, which may or may not activate a function.

    The touchscreen doesn't have to sit directly on top of the display. If you were able to set it beside the display, you could still press the touchscreen and activate a function. The LCD display has no idea where the touchscreen is mounted, all it is concerned about, is what area is being pressed and whether or not that location matches a particular function on the LCD display menu.

    How to Calibrate a Touchscreen (G-Brand)

    If your touchscreen has become non-responsive, I would recommend that you try and recalibrate it first, before sending your unit to us to repair. This may or may not solve your problem but it certainly won't hurt to try.

    Figure #1-1B: Touchscreen Stylus

    Figure #1-1B: Touchscreen Stylus

    When we replace a customer's touchscreen, we always use a touchscreen stylus to recalibrate the new touchscreen. A stylus will give you better accuracy during the recalibaration process than a finger.

    Note: Do NOT attempt to try this procedure if your unit has an assigned PIN. Units with an assigned PIN will prevent the unit from going into mass storage mode until the correct PIN has been entered or until you are at the secure location originally set in the unit. Not being able to access the units drive, prevents us from renaming the GUPDATE.GCD file and accessing the calibration screen directly. Attempting to recalibrate the defective touchscreen with an assigned PIN may skew the calibration so far off, that when a new touchscreen is installed, we won't be able to enter your PIN to access the main menu.

    (G-Brand) You can access the calibration screen by pressing the "wrench" icon on the main menu and then the "display" icon. Press the "Calibrate Screen" button.

    If your unit's touchscreen is really miscalibrated or defective, you won't be able to navigate through the menus to even reach the calibration screen. You'll have to access it through a back door feature as follows:

    (3xx & 6xx Series) - Press and hold down the on/off power button and don't let go of it. The screen will begin to flicker and will say "Pre-boot mode". Keep holding the button down. After some time, you will eventually come to a screen with dots. If the screen says "Loading" and does not go to to the calibration screen with the dots, you will need to connect your unit to a PC with a USB cable and rename the file "GUPDATE.GCD" to "GUPDATE.OLD" from the G-Brand directory on your unit. Once the file has been renamed, repeat the above procedure.

    Once you reach the calibration screen, now you can let off of the on/off power button. Go through the entire procedure of pressing each dot as it appears on the screen until it says "Done".

    (2xx/2xxW Series) - Put your finger on the upper left-hand corner of the screen and slide the on/off power switch to the left and hold until you see the calibration screen.

    (7xx Series) - Touch the screen anywhere and keep your finger there, while moving the on/off switch to left (don't wait for Brand logo to come up - if you did, then you waited to long) and then quickly move the switch the right (lock position). After a short while, you will reach the calibration screen. Go through the entire procedure of pressing each dot as it appears on the screen until it says "Done".

    (8xx Series) - Turn the Nuvi off. Remove the battery from the Nuvi for at least 10 seconds. Press and hold your finger on screen, while putting the battery back in. The Nuvi will boot-up and you should see the text "Pre-boot Mode" appear on the screen. Continue pressing on the screen until pre-boot goes away and the progress bar appears. Now remove your finger. After a short while, you will reach the calibration screen. Go through the entire procedure of pressing each dot as it appears on the screen until it says "Done".

    (Nuvi 11xx/12xx/13xx/14xx/16xx/24xx/25xx Series) - Turn off the Nuvi. Place your finger on the upper left-hand corner of the screen and then push down on the power button to turn the unit on. Release the power button when the Garmin logo appears. Continue to press on the upper left-hand corner of the screen until you see the calibration screen.

    If your unit doesn't recognize your key-presses, then the touchscreen is defective and will it need to be replaced. There is no other way around this.

    Finally, if you are successful in recalibrating your touchscreen, go back and restore the file "GUPDATE.OLD" back to "GUPDATE.GCD", as this file will be helpful in the future, should your Nuvi's system software become corrupted or missing.

    All of our touchscreens employ a matte finish that helps reduce sunlight glare.

    Figure #1-1C: SHARCNET-USA Replacement Touchscreens

    Figure #1-1C: SHARCNET-USA Replacement Touchscreens

    Figure #1-1D: SHARCNET-USA Nuvi 8xx Replacement Touchscreens

    Figure #1-1D: SHARCNET-USA Nuvi 8xx Replacement Touchscreens

    Figure #1-1E: SHARCNET-USA Nuvi 14xx Replacement Touchscreens

    Figure #1-1E: SHARCNET-USA Nuvi 14xx Replacement Touchscreens


    Does Your Screen Look Like Any of These Pictures?


    Figure #2: Cracked 3.5" Touchscreen Glass & Damaged 3.5" LCD Display

    Figure #2: Cracked 3.5" Touchscreen Glass & Damaged 3.5" LCD Display
    (Horizontal Colored Lines)


    Figure #3: Damaged 3.5" LCD Display

    Figure #3: Damaged 3.5" LCD Display
    (Half of Screen Missing)


    Figure #4: Cracked 3.5" Touchscreen Glass & Damaged 3.5" LCD Display

    Figure #4: Cracked Touchscreen Glass & Damaged 3.5" LCD Display
    (Grey or Black Splotches in Image)


    Figure #5: Damaged 4.3" LCD Display

    Figure #5: Damaged 4.3" LCD Display
    (Washed Out Image with Horizontal Lines)


    Figure #6A: Cracked 4.3" Touchscreen & Damaged 4.3" LCD Display

    Figure #6A: Damaged 4.3" Touchscreen & LCD Display
    (White Screen with Black Splotches)

    Figure #6B: Damaged 4.3" LCD Display

    Figure #6B: Damaged 4.3" LCD Display

    Figure #6C: Damaged 5.0" LCD Display

    Figure #6C: Damaged 5.0" LCD Display
    (Vertical or horizontal dotted lines - common in the Nuvi 14xx series)


    A Defective LCD Display Will Exhibit the Following Characteristics:

  • A completely dark or all white display.
  • A dim display even with the brightness control at maximum (Bad backlight).
  • There may be horizontal or vertical lines that appear on the screen that won't go away (See Figure #2).
  • One half of the display is good, while the other half is blank or full of garbage pixels (See Figure #3).
  • There are grey or black splotches on the screen (See Figure #4).
  • The entire screen is all full of random pixels.

    A Defective Touchscreen Will Exhibit the Following Characteristics:

  • Non-responsive commands on the screen when you press them.
  • Wrong functions activated when you press a function (Can also be caused by a miscalibrated touchscreen).
  • Touchscreen needs to be recalibrated frequently. This is called a "drifting" touchscreen.

    Most people assume that their GPS has locked up when it won't accept any touch commands on the screen, however if you tap or slide the on/off power switch, you'll be able to toggle between screens, proving that the unit isn't really locked up at all. The problem is a defective touchscreen.

    This problem can not be resolved by upgrading the firmware. If the touchscreen worked for years with an older version of firmware, then why isn't it working now? It's because the touchscreen has failed and can be confirmed by measuring the resistance of the touchscreen with an ohmmeter. A defective touchscreen will show infinite resistance across one or both pairs of leads. We've heard people report that their touchscreen won't work because their battery is bad or weak. A touchscreen is basically just an adjustable resistor (by touch). It draws very little current. In reality, the real power hog of a GPS is the the LED backlight of the LCD display. If there is enough battery power, to power the LCD and the remaining circuitry sufficiently, then how can the touchscreen response have anything to do with the battery condition? We've heard people say that by running their fingernail underneath the edge of the LCD bezel will fix this problem. All this is doing, is applying pressure to the fractured silver ink/paint causing it to momentarily reconnect. However, the problem will ALWAYS return. It's not caused by touchscreen covers, the deletion of the GUPDATE.GCD file or old firmware as others have claimed. It's caused by a defective touchscreen. No matter what may "seem" to fix the problem, the problem ALWAYS return. The correct solution is to replace the touchscreen.


    Notice: we have observed a high rate of failures on a newer style 4.3 inch touchscreen (6xx series) with a white tail cap, that the LCD manufacturer has been using. We have found this type of touchscreen used with the revised LCD display (LQ043T1DG03A). The touchscreen will just stop working, even though there is no physical damage to the touchscreen or glass. Apparently, the touchscreen connections become broken from the touchscreen tail. The only way to repair this problem is to replace the entire touchscreen/glass. We have also noticed that units with serial numbers beginning with the prefix "12P"(some units) or "13N"or "14V" or "143" have this type of touchscreen installed. We have not seen this problem with the original maroon tail cap touchscreens (used on LCD display LQ043T1DG03) and in units beginning with the serial number of "186". We only use the original maroon style touchscreens for all of our repairs. Please note that this problem is NOT the fault of the GPS manufacturer. There is an outside vendor who manufactures and supplies the LCD displays and touchscreens to the GPS manufacturer.

    Figure #7: Front View, New Style Touchscreen Tail with WhiteTail Cap (left), Original Style Touchscreen Tail with Maroon Tail Cap (right)

    Figure #7: Front View, New Style Touchscreen Tail with White Tail Cap (left)
    Original Style Touchscreen Tail with Maroon Tail Cap (right)

    Figure #8: Rear View, New Style Touchscreen with White Tail Cap (left), Original Style Touchscreen with Maroon Tail Cap (right)

    Figure #8: Rear View - New Style White Touchscreen Tail (left)
    Original Style Maroon Touchscreen Tail (right)

    There are conductive tracks that surround all (4) edges of the touchscreen. These conductive tracks are made from a very thin layer of conductive silver ink/paint. The ink/paint may become brittle and crack when exposed to high or low temperatures over a period of time. This cracking causes the electrical connection to fail, causing the touchscreen to no longer function or to become intermittent. We highly recommend that you do not expose your unit to excessive high or low temperatures.

    Figure #9: Conductive Silver Ink Borders

    Figure #9: Conductive Silver Ink Borders

    Figure #10: A Touchless "Tail" of a Story

    Figure #10: A Touchless "Tail" of a Story
    We've Replaced a Lot of Defective Touchscreens!


    Other Causes for a Non-Responsive Touchscreen:

    While rare, we have replaced defective touchscreens that were damaged as a result of Pepsi or Coca-Cola spilled under the edges of the front bezel. The cola seeps into the touchscreen and essentially changes its resistance properties, making the touchscreen either drift or become non-responsive. Whenever we see a brown sticky substance all around the inside of the bezel and LCD display, this is a sure sign that the unit has suffered some sort of liquid damage. Cleaning the inside bezel with 99% rubbing alcohol and replacing the touchscreen usually resolves the problem.

    We Offer the Following Repair Services on GPS LCD Displays & Touchscreens:

  • 3.5" LCD/Touchscreen/Glass Replacement (w/New LCD *installed*).
  • 3.5" LCD/Touchscreen/Glass Replacement (w/Used LCD *installed*).
  • 4.3" LCD/Touchscreen/Glass Replacement (w/Used LCD *installed*).
  • 5.0" LCD/Touchscreen/Glass Replacement (w/Used LCD *installed*).
  • 3.5" Touchscreen/Glass Replacement Only - LCD Display Not Included (*installed*).
  • 4.3" Touchscreen/Glass Replacement Only - LCD Display Not Included (*installed*).
  • 5.0" Touchscreen/Glass Replacement Only - LCD Display Not Included (*installed*).

    Please Click [HERE] to See Our Repair Price List.

    Note to all 2xx(W) & 7xx owners: We have seen (3) different LCD modules being used. The original display uses a (3) flex cable LCD display, while the newer displays use a single flex cable. Currently, we do not carry replacement displays that have the single flex cable. However, we can replace a cracked touchscreen on any of the (3) displays. Later production units use the single flex cable displays. Your unit's serial number may give a hint at to what type of display is being used. A serial number beginning with (2) numbers, like "17" indicates your unit probably uses an older (3) flex cable LCD module. Units beginning with a number and letter like, "1C" will probably use the the single flex LCD module.


    We highly recommend that your purchase and use the a friction mount rather than a window mount.

  • The friction mount is easily removable from your vehicle and won't move around on your dashboard due to it's weight and rubber padding on the bottom.
  • The friction mount is legal in all US states. The window mount is NOT legal in a all US states.
  • Your GPS is far less likely to fall and be damaged when using the friction mount.

    WARNING!!! Taking your GPS apart requires the right tools. There are internal flex ribbon cables for the antenna, touch screen and LCD screen. These cables are very delicate and can be torn easily if you're not careful. The antenna flex ribbon cable runs through the swivel antenna shaft and is very delicate. In addition, these devices contain components that are very sensitive to static discharges and can be damaged without using the proper grounding techniques. Please do not attempt to make this repair yourself unless your are qualified to do so. We have received numerous emails from people who have gouged and cracked their GPS's case and permanently damaged their GPS's LCD screen and antenna! Save yourself the aggravation and possible damage to your GPS by allowing us to repair your GPS for you.

    Please feel free to fill out a Repair Request/Quote Form, which is located at the bottom of the left-hand menu. We'll be more than happy to discuss your GPS problem with you and attempt to offer a possible solution to have the problem resolved.


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