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The key is slow ramp up and allowing things to ease up to temp rather than blast them. Today I used it on an iphone 6 backlight job and I saw solder balls spray out of a coil and realized I had never calibrated my home station preheater and was using it on my work station temps. While it may not seem like a huge problem at first.
![audio ic iphone 7 plus board view audio ic iphone 7 plus board view](https://x8d5b6k6.rocketcdn.me/wp-content/uploads/2019/07/iphone-audio-ic-repair.png)
I have found the preheater immensely valuable but it can also get dangerous if it is up too high. These issues stem from a problem with your iPhone 7 Plus audio chip, located on the logic board. I haven't had that side effect, the only ones i've gotten is jumper floats and phone still boot loops, and I've heard a few reports around town of people losing vibrator function by nudging homer. No Sim to Sim probably requires SIM DETECT as well as SIM I/O etc-especially if you think you had lifted dudes. I would do the exact same with the other SIM lines. When a sim is plugged in the 1V8 is than activated which should read sim.
#AUDIO IC IPHONE 7 PLUS BOARD VIEW CRACKED#
When there is no sim in this line is shorted to ground which makes it detects that there is no sim in. Fix cracked glass, LCD, change battery, fix power button, replace charge port, data recovery, logic board repair & more. I power up and Measure voltage and get 1V8 on the pin from the sim card holder for SIM1_DETECT which is correct. lnd-l21 (hl2lndm) xiaomi redmi 7 j610f lg pm450 htc desire 12 plus. On the other side this line goes under BB_RF IC I believe to one solder ball. Audio IC Charging IC Coil/Crystal/Diode IC CPU IC EMMC IC iPhone IC. This Big Audio IC Chip is used to control Speaker and Microphone of a iPhone 6S / 6S Plus. Certainly, there are a few components close by the Audio IC around the NAND that is underfilled, I pick away and found one loose capacitor, which isn't on the SIM1_DETECT line. Best Quality Big Audio IC for iPhone 6S / 6S Plus / 7 / 7 Plus. I took a look at the schematic and thinking general underfilled components possibly on the SIM1_DETECT line may have gotten lifted.
![audio ic iphone 7 plus board view audio ic iphone 7 plus board view](https://s22.postimg.cc/67907ebsx/photo_2018-09-11_22-29-51.jpg)
Tried several know good sim to be sure it's a board issue. I did a repair for an iPhone that boots looped apple logo by doing the 4 jumpers under audio IC, that fixed the issue with the loop and the device boots to the home screen. I am curious what side effects everyone generally get when doing Audio IC jumper repair on the iPhone 7 signature failure.