iPhone 6s

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iPhone 6s and iPhone 6s Plus

Problem	Solution
Phone is boot looping	This behaviour can be caused by a bad battery or a bad PMIC - both which are common on this phone. In rare cases a messed up home button plug on the logic board can cause boot looping.
Not Charging But still turns on	If it charges at 0.005A via USB but still doesn't charge, it is usually Tristar or Shorted WiFi Connect the board to the DC Power Supply & check the following: If you have about 0.500mA before you prompt to boot, then you most likely have a shorted WiFi This requires you to replace WiFi, then unbind WiFI using the iRepair P10 (easiest method) See this video on how to Unbind WiFi: https://youtu.be/exi0F4oMSCI If you don't have any current draw before prompt to boot, but after you prompt to boot, the current draw starts around 0.200A, then it's most likely Tristar Replace Tristar & test again Refer to this video for the process: https://www.youtube.com/watch?v=KCUa8ayq7OI
No Image	If the phone boots up, but shows no image, do the following Diode mode the LCD connector Check for any shorts on the image lines, like PP5V7_LCM_AVDDH_CONN PN5V7_LCM_MESON_AVDDN_CONN PP1V8_LCM_CONN PP5V7_MESON_AVDDH_CONN Most likely, you'll find a short on the above lines. If so, inject voltage (1V/1A should be enough) to find the heat source. Remove the cap that heats up & test again. Here's a full video tutorial of that process: https://youtu.be/2FhGIw6WiUw
No Backlight	If image shows up by shining a light diagonally across the screen but no backlight, check the backlight filters near the logic board connector, particularly FL4221, they can blow. Here's a full video tutorial: https://www.youtube.com/watch?v=kgKpzfgOzL0

FPC Connectors diode mode readings

Use these diode mode maps as a guide to troubleshoot a problem. You must use the RED PROBE on ground and the BLACK PROBE on the pin you are measuring.

For example: you are troubleshooting a no backlight situation, so you probe the pins on the display FPC that correspond to backlight. If a pin says you should read 0.65 and you are reading OL or a short to GND then that's where you need to go.

If instead of getting 0.65 you read 0.58, move on to the next one, remember every multimeter is different and even slight differences in temperature affect this readings. What you are looking for is extreme differences in values, if you are expecting some value and you get a short to ground that is where it is more likely to be your issue.

iPhone 6S

Display and Touch connector (J4200)

Diode mode for iPhone 6S Display connector. Top Right goes to top edge of the board, under the rear camera.

Charge port / dockflex Connector (J4600)

iPhone 6S DockFlex charge port connector. Bottom right goes to bottom of the phone, where the loudspeaker is.

Battery connector (J2400)

iPhone 6S battery connector. Bottom left goes to the edge of the board, next to the bottom of the battery.

Home button, TouchID Connector (J4100)

iPhone 6S home button / TouchID connector. Top right goes to the top of the board, under the rear camera.

Rear camera Connector (J3200)

iPhone 6S rear camera connector. Top right goes to the top of the board, under the rear camera.

Front camera, proximity sensor, earspeaker, ambient light sensor connector (J3100)

iPhone 6S front flex connector. Contains front camera, proximity sensor, ambient light sensor, earspeaker. Top right goes to top of the board, under the rear camera.

Volume and Power buttons, flashlight, ringer switch (J4700)

No available data as of yet.

iPhone 6S Volume, power buttons, ringer switch and flaslight connector. Top left goes to top edge of the board, next to the mute/ringer switch.

iPhone 6S Plus

Display and Touch connector (J4200)

Diode mode for iPhone 6S Plus Display connector. Top Right goes to top edge of the board, under the rear camera.

Charge port / dockflex Connector (J4600)

iPhone 6S Plus charge port / dockflex connector diode mode readings. Bottom right goes to bottom of the phone, where the loudspeaker is.

Battery connector (J2400)

No original data as of yet. Please refer to 6S instead.

iPhone 6S Plus battery connector. Bottom left goes to the edge of the board, next to the bottom of the battery.

Home button, TouchID Connector (J4100)

iPhone 6S Plus home button / TouchID connector. Top right goes to the top of the board, under the rear camera.

Rear camera Connector (J3200)

iPhone 6S Plus rear camera connector. Top right goes to the top of the board, under the rear camera.

Front camera, proximity sensor, earspeaker, ambient light sensor connector (J3100)

iPhone 6S Plus front flex connector. Contains front camera, proximity sensor, ambient light sensor, earspeaker. Top right goes to top of the board, under the rear camera.

Power button, flashlight connector (J4700)

iPhone 6S Plus power button and flashlight connector. Top right goes to top edge of the board, under the rear camera.

Volume buttons, mute/ringer switch connector (J4701)

iPhone 6S Volume buttons, ringer switch connector. Top left goes to top edge of the board, next to the mute/ringer switch.

BaseBand PMU diode mode readings

iPhone 6S BB PMU Diode mode readings. Pin 1 is on bottom left and top right points to the crystal.

Tristar and Tigris diode mode readings

iPhone 6S Tristar (U4500) Diode mode readings. Pin A1 (marked in the chip) points towards Top Right

iPhone 6S Tristar (U4500) Diode mode readings. Pin A1 (marked in the chip) points towards Top Right