iPhone 6S Plus No Service After WIFI repairing - LOOK HERE!

Regarding the iphone 6S Plus No Service and WIFI error, many mobile phone maintainers have encountered it, but many customers have reported that after getting the mobile phone repair shop to fix the problem, their iPhone will show no service or WIFI error after some time. This is a headache, but we have the privilege of inviting professional phone repairmen, who will share a maintenance guide to check out the following article.

Trouble phenomenon: 

An iPhone 6S Plus has no signal and no service when insert the SIM card, after asking the customer, we known that the iPhone no service after booting is caused by the customer fixing the WIFI failure himself.

Repair process:

Power on iPhone 6SP, insert the SIM card to test, it did display "no service". Carrier signals can be manually searched, but unstable.

Continue testing, the signal is normal when you turn on 4G in Cellular Data, it can connect to the 4G network. It's normal to make phone calls and browse the Web，but the signal is bad. Turn off 4G, and then choose 3G and 2G, both of them are showed no service. 

The 4G signal can be searched normally, but 2G and 3G are no service, we suspected that the fault should be an iPhone antenna switch or a 2G amplifier. 

Is it an error in the antenna switch frequency selection? We decided to replace the antenna switch and test it. After remove the antenna switch, use digital multimeter to measure the diode data, we found the 21th PP_2V8_LD014 power supply of the ULASM_FR antenna switch is grounding short-circuited. 


Open the WUXINJI Dongle to check the iPhone schematic diagram, we found the PP_2V8_LDO14 is connected to many places, one of them was sent to the filter U_VOX_RF next to the iPhone WIFI IC. 

Measuring the diode data for all the power supply of filter, we found there are several power supply circuit are short-circuited.

According to the description of the customer, we judged that the fault is that the tin ball of the filter next to the iPhone WIFI IC was burned when he repairing the iPhone WIFI IC.

Use QUICK 861DW hot air rework station and Titanium Alloy Tweezers to remove the U_VOX_RF directly，and then turn on iPhone to test, now the 2G, 3G and 4G signal can be searched normally, and the signal tested is normal. 

After re-installing the U_VIX_RF, all functions are normal, the repairs end!

Tips: For more mobile phone maintenance guides and iPhone maintenance tools, you can view www.vipprogrammer.com

Comments

  1. Sikander ArshadApril 8, 2020 at 10:43 PM

    Thanks for sharing such a great piece of content. It really helps me and clears so many thoughts running in my mind. Besides, I'm from Pakistan and curious to know iPhone 6 Price in Pakistan.

    ReplyDelete

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