Desktop DDR4 Memory Test Card Two Power Supply Methods, More Convenient To Use, 3.6v Button Battery Power Supply, Type-C Interface Power Supply For Troubleshooting, Press The Test Switch. If All The Indicators Are On And The Brightness Is Consistent, It Means There Is No Fault In The Hardware Of The Memory Module. If The Indicator Light Flashes, It Means The Gold Finger Has Poor Contact. If The Indicator Light Does Not Light Up, It Means There Is An Open Circuit Fault. Check Whether The Gold Finger Is Dirty, The Resistor Is Damaged Or The Circuit Is Open. According To The Pin Number Of The Indicator Light, Use A Multimeter To Find The Fault Point. If One Or More Indicator Lights Are Particularly Bright, It Indicates A Short Circuit Fault. DDR4 Memory Test Steps: 1. Take Out The CR2032 Button Battery From The Accessory Bag And Install It Horizontally On The Button Battery Holder Of The Test Card. Pay Attention To The Silk Screen Side Of The Battery Facing Up (Must Not Install It Backwards) 2. Open The Memory Slot Latch On The Test Card Outwards, And Insert The Memory Module With Both Hands Facing Downwards. 3. Select The Voltage Switch Position, One Side Is Powered By CR2032 Button Battery, And The Other Side Is Powered By Type-C External Power Supply (Need To Connect Type-C Data Cable) 4. Then Press And Hold The Black Button (Test SW) On The Test Card. If The Memory Module Is A Good Product, The Led Lights On The Test Card Will All Light Up. If The Memory Module Is A Defective Product, The Corresponding Led Will Not Light Up. Follow The Screen Printing Of The Led That Does Not Light Up. The Location Number Can Be Used To Find The Bad Location Of The Gold Finger Of The Memory Stick. 5. When The Test Is Completed, Release The Black Button, Open The Silver Metal Buckle Of The Memory Slot With Both Hands Outward At The Same Time, And Pull Out The Memory Module At An Angle Of 45 Degrees. Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB+Metal Package Contents: 1 * Desktop Memory Stick Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.