A1706 Can not Boot when Press Power Button with Abnormal Standby Current

A1706 Can not Boot when Press Power Button Motherboard No. : 820-00239-A Malfunction : Can not Boot when Press Power Button with Abnormal Standby Current Troubleshooting: Remove the back cover, disconnect the battery and measure the current to see if the current changed. 1.If the current is not change, it means the problem is from the […]

Macbook A1466 2015 Version Battery was Drop Down Very Fast

Motherboard No.: 820-00165-A Malfunction Phenomenon: Macbook A1466 2015 Version Battery was drop down Very Fast after it shows apple logo when disconnected with power supply by cable, but it was normal when use battery with power supply with cable together. Possible Reasons: 1. Battery was broken; 2. Battery supply circuit or battery detective circuit on […]

iPhone XS Can not Be Turned On with Current higher than 1A

Malfunction Phenomenon iPhone XS can not be turned on with current higher than 1A.   Trouble Shooting We disassembled the phone and checked the current with the DC power machine. Once we connected with the DC power machine, the current directly jump to 1.09A. Then we tried to use rosin to locate the shorted component, […]

iPhone XS 3D Touch Can not Work

iPhone XS 3D Touch Can not Work   Trouble Shooting We disassembled the phone and checked the motherboard, there motherboard was water damaged around the touch connector and one of the components was lost. We cleaned the corroded area and checked the diode value on connector J5800, the diode value on pin 8 was OL, […]

Macbook Air A1466 2016 Version Can Not Boot Up with Current Stayed at 0.126A

Motherboard No.:  820-00165-A Malfunction:   Macbook Air A1466 2016 Version Can Not Boot Up, the current changed from 0.03A to 0.126A, and stayed at 0.126A. Troubleshooting: There are two main reasons can cause this kind of issue. 1. Some of the power wasn’t generated; 2. SMC, BIOS data or other parts was broken; We removed […]

Macbook A1466 2016 Version Can Not Be Turned On

Motherboard No.: 820-00165-A Malfunction Phenomenon: There was charing current when connected with power cable, the it can not be turned on when press power button.   Possible Reason: There was charging current when connected with power cable, it means the PPBUS_G3H was normal, if there it’s abnormal, there shouldn’t be charging current when connected with […]

iPhone XR No Service

Malfunction Phenomenon iPhone XR no service when we insert the sim card, and the IMEI was normal in settings, and when we press “*#06#”, the IMEI was also normal.   Trouble Shooting Because the IMEI was normal, according to our experience, the problem was from the RF(Radio Frequency) circuit. We disassembled the phone and checked […]

iPhone XR Backlight issue – Half Dim and Half Bright

Malfunction Phenomenon iPhone XR Half Dim and Half Bright.   Trouble Shooting After we replaced another screen, the malfunction was still the same. Then we opened the schematics to check the backlight circuit. We could see the backlight circuit was similar to the iPhone P series models like 6 Plus or 7 Plus. There were […]

iPhone XR Can not Be Turned On

Malfunction Phenomenon iPhone XR can not be turned on with a large current when connecting with DC power machine   Trouble Shooting   We disassembled the phone and checked if there was any water damaged area or other obvious malfunction, when connected with DC power, the current is very large, in our experience, the malfunction […]

Samsung Galaxy S8 Plus Cannot Boot Up

Defect Phenomenon Samsung galaxy S8 Plus Cannot Boot Up,  just suddenly stopped working during normal use.   Troubleshooting Disassemble the phone and connect with DC power supply, find large current.    After measuring, we find it’s VPH_PWR get to GND.     Then use rosin inspection method, apply DC power to find out the shorted […]

Samsung A10 30mA Current Leakage Cannot Boot

Defective Model: SAMSUNG A10 Released 2019, March 19 Version: SM-A105F     Defect Phenomenon Samsung Galaxy A10 Cannot Boot, press the power button no response, and with 30mA current leakage when connected with DC power supply.     Troubleshooting Press start-up button no response, normally is caused by below possible reasons: 1. Charging IC get […]

Samsung Galaxy Note 9 Cannot Boot Up

Defect Phenomenon Samsung Galaxy Note 9 Cannot Boot Up Defective Model: SAMSUNG Galaxy Note 9 Released 2018, August 24 Version: SM-N9600/DS (LATAM, Brazil, China) Troubleshooting and Repair Process Connect with charger but no response. First change another battery to test to exclude the no charging issue is caused by the battery drain.   Then take […]