| 1. Exact Part Number | Confirm the complete marking, including suffixes and revision codes. | Aa104vh02 | Similar-looking display modules may have different connectors, voltages, or mounting dimensions. |
| 2. Screen Size | Compare the active display area with the original module. | Approximately 10.4 inches diagonal | A replacement with a different active area may not fit the enclosure or bezel. |
| 3. Native Resolution | Verify the controller and system support the panel’s native resolution. | 640 × 480 pixels, VGA format | Using a different resolution can cause scaling, blank output, or incorrect image positioning. |
| 4. Display Technology | Check the panel type and whether the viewing direction suits the application. | Color TFT LCD; approximately 262K colors | Color depth and viewing characteristics affect readability and image quality. |
| 5. Interface and Connector | Request a clear photograph of the connector and compare the pin count and orientation. | Must match the original panel interface and pinout; do not assume compatibility from the part number alone. | A mechanically compatible panel can still be electrically incompatible. |
| 6. Power Requirements | Compare logic voltage, backlight voltage, current, and connector pinout with the equipment service documentation. | Use only the electrical ratings stated on the matching technical datasheet. | Incorrect power input can permanently damage the panel or its backlight circuit. |
| 7. Physical Dimensions | Measure the overall width, height, thickness, mounting holes, and bezel clearance. | The replacement should match the original mechanical drawing; a 10.4-inch diagonal alone is not sufficient. | Small differences in mounting points or thickness may prevent installation. |
| 8. Condition and Testing | Ask whether the module is new, unused surplus, refurbished, or removed from equipment. | Prefer listings with a powered test image and confirmation of no dead pixels, lines, stains, or backlight faults. | Older display modules may develop storage damage, uneven illumination, or connector oxidation. |
| 9. Price Comparison | Compare the total delivered cost rather than the item price alone. | Include shipping, taxes, import fees, protective packaging, and any testing surcharge. | A lower listing price may become more expensive after delivery and return costs. |
| 10. Included Accessories | Check exactly what is included in the package. | Usually the display module only; cable, inverter, controller board, mounting hardware, and protective film may be excluded. | Missing cables or controller hardware can make an apparently inexpensive purchase unusable. |
| Availability and Returns | Confirm stock status, dispatch time, warranty duration, and return conditions before payment. | Choose a listing with verifiable stock, trackable delivery, documented testing, and a written return policy. | Obsolete or surplus parts may be listed without actual inventory and can be difficult to replace. |