GALAXY gt720 graphics card started screen is black or frozen, and measured Measuring diode value. It was found that GPU chip was damaged. After replacement, the display was normal.
Honor 50 mobile phone can't make a phone call. After remaking power amplifier chip, the fault is repaired.
Lenovo B575E notebook Won't Turn On, through detection found that 3V standby filter Capacitor has a problem, after replacement, the fault is repaired.
The Acer acere5-511 notebook did not respond when it was turned on, the oscilloscope grasped the waveform, and there were many faults and twists in the whole process of maintenance.
The WiFi signal of iPhone 6 Plus is sometimes absent. Replace PMU, and the fault is repaired perfectly.
There is no VCC in the core of iCraft gtx650 graphics card. Replace the core of VCC chip and boot normally.
Lenovo Y470 can be charged when it is turned off, but can't be charged when it is turned on. Remove PU201 and PQ201, and replace the component charging chip, the fault is perfectly repaired
iPhone 6 can not be activated, after replacing NFC chip, the fault is perfectly repaired.
Dell 15-7572 notebook Won't Turn On, replace fault Capacitor and repair.
