iPhone 6 no display and speaker no voice: we can fix it!

The iPhone 6 screen no display, and the speaker no voice.

However, when connect it to DC power supply, the current is normal, just the shows black screen. What's going on? Don't worry, we can fix it!

Disassemble the iPhone and measure the resistance of the display socket; the diode data of the screen reset and open signal are all abnormal. Observe it under the microscope, we found the trace of the hitting on screws which on both sides of the left and right. Remove the iPhone screws, scrape it, and then solder the jump wire on it with soldering station, now the iPhone can display normally. Because diode data of fingerprint socket which on the right screws are normal, so we didn't scrape it.

After testing, it can record, playing a sound, the earpiece has no sound. Use multimeter to measure the diode data of iPhone front camera socket earpiece pin, the data is normal. The earpiece pin is through the inductor directly to the audio IC. Remove the iPhone audio IC, and then measure the diode data of I2S bus which is through to CPU, we found both the CODEC_TO_AP_XSP_I2S2_DIN and AP_TO_CODEC_ASP_I2SO_DOUT are infinitely large, it is open circuit.

Find an iPhone motherboard to scrape it to check the line layout, scrape and ended up on the third floor of the right screw column. Mend the wire and put it back into the chip.

In the end, assemble iPhone and test it, the speaker has voice now, we can continue to use the iPhone 6 normally.