If your Garmin GPSMAP 1242/1222xsv has a cracked screen, dead pixels, touchscreen failure, or backlight issues, replacing the LCD screen assembly is usually the most effective repair solution.
This step-by-step guide explains how to safely replace the screen while protecting the waterproof housing and internal electronic components.
Tools Required
Before starting the repair, prepare the following tools:
| Tool | Purpose |
|---|---|
| Phillips Screwdriver | Remove casing screws |
| Plastic Pry Tool / Opening Pick | Safely open the housing |
| Tweezers | Disconnect ribbon cables |
| Heat Gun or Hair Dryer | Soften screen adhesive |
| Double-sided Tape or T-7000 Adhesive | Install replacement LCD |
| Cleaning Cloth | Remove dust and adhesive residue |
Step 1 – Disconnect Power for Your Garmin GPSMAP 1242/1222xsv
Completely power off the Garmin GPSMAP device.
Disconnect all connected accessories and cables, including:
- Power cable
- NMEA network cable
- Transducer cable
- SD memory card
Place the device on a soft cloth or anti-static surface to avoid scratches and static damage.
Step 2 – Remove the Back Cover
Use a Phillips screwdriver to remove all screws securing the rear housing.
Carefully insert a plastic pry tool between the front bezel and rear housing to separate the casing.
Warning: Do not force the housing open, as internal ribbon cables may still be attached.
Step 3 – Disconnect LCD Ribbon Cables
Locate the GPSMAP 1242/1222xsv LCD display ribbon cable and touchscreen ribbon cable connected to the mainboard.
Carefully unlock the connector latches and disconnect:
- LCD ribbon cable
- Touchscreen ribbon cable
- Backlight connector
Tip: Take reference photos before disconnecting cables to simplify reassembly.
Step 4 – Remove the Damaged Screen
Apply moderate heat around the edges of the display to soften the adhesive.
Slowly lift the damaged LCD screen assembly away from the front bezel.
Be extremely careful not to damage:
- Waterproof gasket
- Front bezel
- Internal wiring
- Touchscreen connectors
Before installing the replacement screen, completely remove any remaining adhesive residue.
Step 5 – Install the New Garmin GPSMAP 1242/1222xsv Screen
Apply new double-sided adhesive tape or T-7000 adhesive around the screen frame.
Reconnect the new LCD display and touchscreen ribbon cables to the motherboard.
Before fully sealing the device:
( 1 ) Connect temporary power.
( 2 ) Turn on the device.
( 3 ) Test the following functions:
- LCD display quality
- Brightness adjustment
- Touchscreen response
- Backlight operation
- Dead or stuck pixels
If all functions operate normally, continue with reassembly.
Step 6 – Reassemble the Device
Carefully reinstall:
- Waterproof gasket/seal
- Rear housing
- Mounting screws
Tighten the screws evenly to maintain waterproof performance.
Important: Do not overtighten the screws.
Step 7 – Final Testing
Power on the Garmin GPSMAP device and verify:
- Full display brightness
- Proper touchscreen response
- Stable image quality
- No screen flickering
- GPS functionality
- Sonar functionality
Make sure the device operates normally before returning it to service.
Conclusion
Replacing the screen on a Garmin GPSMAP 1242/1222xsv is a cost-effective way to restore a damaged marine chartplotter.
With proper tools, patience, and a high-quality replacement display assembly, both professional repair technicians and DIY users can successfully complete the repair and extend the lifespan of the device.
