IPhone 4S Professional Schematic Remake by Wites OM Tesla. 6 3 C A D 2 1 A B 8 7 6 5 4 3 D B 8 7 5 4 2 1 Pagani DVT MLB Top Placement Drawing PCB:820-3031-11 and 820-3031-12 (no surface PAD difference) XW2 J1RF XW4 FD1 U5RF U19 U1019 U9 U52 U13 D3 U60 D2 SP1RF R40 FD6 FD2 FL2RF BR2 BR1 U2RF XW5 XW3 XW6 XW7 n o refdes+3 norefdes+4 norefdes+5. Feb 26, 2018 - iPhone 6 Full PCB cellphone Diagram Mother Board Layout. Iphone 6s Plus Iphone 4s Apple Iphone Iphone Repair Mobile Phone Repair Latest Phones.
Another day another boards. Lately getting a lot of iPhone backlight repairs. No backlight means iPhone still works and displays very faintly picture. On 6 Plus and 6S Plus sometime you have “half backlight”. You will a shadow in one of top corners of the screen.
Backlight often burns out when replacing the screen. Even with iPhone turned off, there is battery voltage going straight to LCD connector. That’s why you always want to unplug the battery before doing anything else. When unplugging the lcd, if it crosses the pins from backlight to ground you are creating a short that immediately kills filter.
There are also random backlight failures. Burned filter, bad booster chip, short on capacitor, bad diodes. When the filter burns out often it burns the pad that it sits on. At that point it’s necessary to run a jumper wire from another component that has the signal for backlight fuse. This is a delicate operation and a good repair to show microsoldering skills.