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Sony CDX-GT540UI Motherboard Replacement

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This guide will show how to replace a motherboard. The motherboard could be causing faulty display, not turning on, and bad sound quality on a continuous basis.

Before any repair work can be done, one must remove the device from the vehicle. To do so follow this link to see a vehicle general removal of a stereo system.

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  1. Sony CDX-GT540UI Motherboard Replacement, Front Panel: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Locate face-plate eject button.

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  2. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:02crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Press the eject button.

    • Remove the face-plate.

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  3. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove two 4.9mm Phillips #00screws on the front of the device.

    • Remove two 7.5mm Phillips #00screws on the front of the device.

    • When the screws are removed, the eject lever may fall into the device. Make sure the device is held horizontal and level.

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  4. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Rotate device 90 degrees to either side.

    • Use the plastic opening tool to pry open the top and bottom tab respectively.

    • Repeat on opposite side.

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  5. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove front panel.

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  6. Sony CDX-GT540UI Motherboard Replacement, Wiring Harness: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Locate the clip on the wiring harness.

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  7. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:07crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:07crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Press down on the clip like you would an Ethernet cable.

    • Rock harness side to side, pulling gently towards you until harness detaches.

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  9. Sony CDX-GT540UI Motherboard Replacement, Back Panel: crwdns2935265:08crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Locate back panel.

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  10. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:09crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:09crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:09crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove four 11.5mm Phillips #00 (silver) screws from back panel.

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  11. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:010crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove four 9.5mm Phillips #00 (black) screws from back panel.

    • Remove two 7.5mm Phillips #00 (black) screws from back panel.

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  12. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:011crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove back panel.

    • On the back panel there will be thermal (white) paste. Do not touch.

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  13. Sony CDX-GT540UI Motherboard Replacement, CD Drive: crwdns2935265:012crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove one 9.5mm Phillips #00 screw.

    • Rotate device 180 degrees and repeat step.

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  14. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:013crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:013crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Using plastic opening tool, detach the tabs. There are two on either side.

    • You will need to apply a decent amount of force to detach.

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    • Remove top panel.

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  16. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:015crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Pull up CD drive slightly.

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  17. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:016crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Disconnect motherboard connection.

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  18. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:017crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove CD drive.

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  19. Sony CDX-GT540UI Motherboard Replacement, Motherboard: crwdns2935265:018crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove three 6.7mm Phillips 300 screws.

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  20. Sony CDX-GT540UI Motherboard Replacement: crwdns2935265:019crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Pull motherboard up.

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To reassemble your device, follow these instructions in reverse order.

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