The Samsung Galaxy Z Fold 6 is a foldable benchmark, yet some users report "rainbow lines" on the internal display and abnormal hinge noises over time. These issues compromise the visual experience and often signal imminent hardware failure. This article analyzes these core faults and offers professional maintenance guidance.
I. In-depth Analysis of the Issue
The appearance of vertical or horizontal colored lines (usually green, pink, purple, or white) on the internal screen is a typical manifestation of damage to the flexible OLED panel.
1. Causes of the Fault
· Local stress concentration: When the foldable screen is at a specific angle, uneven force between the hinge support structure and the screen backplate will cause damage to the pixel array.
· Damage to the under-screen connecting cable: Repeated folding causes metal fatigue in the internal display FPC, disrupting signal transmission.
· External impact and extrusion: Even if there are no cracks on the screen surface, the internal organic light-emitting layer will suffer permanent bad lines if pressed excessively with fingernails or if foreign objects are trapped when the device is closed.
2. Diagnostic Methods
Before seeking maintenance, it is necessary to distinguish between software driver errors and physical hardware damage.
· Screenshot method: Take a screenshot of the current screen using the system's built-in screenshot function. If the screenshot displays normally on other devices, the fault is confirmed to be a screen hardware failure.
· Solid-color background method: Switch to red, green, and blue solid-color backgrounds respectively, and observe whether the lines persist. If the position of the lines remains fixed under any screen display, the panel has suffered irreversible physical damage.
II. Hinge Abnormal Noise and Mechanical Structure Risks
The hinge is the core component of a foldable screen. Once clicking sounds, friction sounds, or obvious resistance occur, it usually indicates that the internal mechanical balance has been disrupted.
1. Classification and Sources of Abnormal Noise
· Particle intrusion: Fine particles bypassing the dust-proof Soft Cleaning Brushes enter the gear set, causing clicking sounds. Use a soft-bristle brush to clear debris from the hinge gaps.
· Protective film friction: In cold environments, the hardened adhesive layer squeaks during folding.
· Misalignment of the internal support structure: If the device has been dropped, the cam mechanism inside the hinge may experience minor displacement, causing friction between metal components during rotation.
2. Potential Impacts on Functionality
If minor abnormal noises are left untreated, they may escalate into an inability to fully unfold the device to a 180-degree flat position. In severe cases, the internal support plate may pierce the OLED screen, causing secondary damage.
3. Pre-maintenance Preparations
Blind operations on such sophisticated foldable screen devices may result in the expiration of the warranty or the escalation of damage.
· Data Protection and Backup
a. Back up Back: up all contacts, text messages, and application data completely using the PC-side Smart Switch or cloud storage services.
b. Enable "Maintenance Mode": Activate this function in the settings to lock personal photos and private information, ensuring that maintenance personnel cannot access private spaces while testing screen functions.
III. Specific Troubleshooting
Such hardware-level faults usually require handling in a professional dust-free operating environment.
1. Preliminary Cleaning of the Hinge Area
Before sending the device for repair, non-invasive cleaning can be attempted.
· Gently clean dust along the hinge gaps using a soft fine brush or a low-pressure compressed air canister.
· Never pour liquid cleaning agents into the hinge interior, as this may damage the internal circuits.
2. Module Assembly Replacement
In the current maintenance framework, the screen, middle frame, hinge, and battery of the Samsung Galaxy Z Fold 6 are often integrated into a single component.
· Disassembly steps: Technicians first use a professional YCS Heating Pad to soften the back cover adhesive and separate the rear casing.
· Internal component transfer: Disassemble the motherboard, camera module, vibration motor, and battery. Transfer the motherboard, cameras, and battery to a new screen-hinge-frame assembly.
· Air tightness test: After installation, a vacuum pressure test must be conducted to ensure that the repaired device still maintains the IPX8 waterproof rating.
3. Daily Maintenance Suggestions
· Avoid frequently opening and closing the device in environments with heavy wind and sand.
· It is strictly prohibited to tear off or replace the internal screen protective film without official authorization, so as to prevent stretching damage to the OLED panel.
· Check for large particles of dust or debris on the internal screen before closing the device.
· Although foldable screens offer unprecedented portability, they also require more careful care.
V. Conclusion
The "rainbow lines" and hinge abnormal noises of the Samsung Galaxy Z Fold 6 are essentially manifestations of flexible material fatigue and precision mechanical wear. If your device exhibits the aforementioned symptoms, you may follow this guide from China Phonefix for troubleshooting. We hope this article will be helpful to you.
