{"id":1984,"date":"2017-09-13T00:00:00","date_gmt":"2017-09-13T00:00:00","guid":{"rendered":"http:\/\/192.168.2.19:8666\/?p=1"},"modified":"2024-09-18T17:53:08","modified_gmt":"2024-09-18T09:53:08","slug":"fix-iphone-frozen-screen-issue","status":"publish","type":"post","link":"https:\/\/rewa.tech\/fr\/fix-iphone-frozen-screen-issue\/","title":{"rendered":"iPhone Frozen Screen Issue – Logic Board Repair Solution"},"content":{"rendered":"

Some users complained about the iPhone frozen issue\u00a0of their iPhone 7 after dropped.<\/p>\n

Even reinstallation couldn\u2019t help with the iPhone frozen problem once and for all.<\/p>\n

The malfunction was caused by the iPhone 7 production process, which could be fixed by maintaining audio circuits.<\/p>\n

REWA offers a new iPhone frozen solution regarding logic board repair!
\n\"How<\/p>\n

Fix The iPhone Frozen Screen Issue With Logic board Repair Solution<\/strong><\/p>\n

Power on, the screen is stuck off and power button responses slowly.<\/p>\n

\"Power<\/p>\n

Disassemble the phone, detach the display assembly. Replace with a new display assembly.
\n\"Disassemble<\/p>\n

Turn on the phone and test. The screen is still stuck off.<\/p>\n

\"Turn<\/p>\n

Enter into record mode, the record icon is in nonfunction state.<\/p>\n

Screen replacing doesn\u2019t help on the stuck issue, we can tell that there is a problem with the audio circuit. Move on to logic board repairing.<\/p>\n

\"Enter<\/p>\n

Take out the logic board\u00a0and tear off the shield sticker.<\/p>\n

\"Take<\/p>\n

Apply some BGA paste flux around the audio IC\u00a0and blow it with hot air gun at 300 degrees.<\/p>\n

Then take down the audio IC.
\n\"Apply<\/p>\n

Dip some rosin with soldering iron to clean the tins.<\/p>\n

Then dip some rosin with Goot wick for secondary cleaning. After that, clean again with PCB cleaner.
\n\"Dip<\/p>\n

Test resistance value of pin C12 (U3101 audio IC). The resistance value is swinging.
\n\"Test<\/p>\n

D\u00e9rouler le plan d'entretien pour r\u00e9f\u00e9rence.<\/p>\n

Locate the signal of pin C12: 12S-AP-TO-CODEC-MCLK. The signal was connected with CPU via resistor\u00a0R1103.
\n\"Roll<\/p>\n

Scrape the insulation varnish off the copper wire connecting pin C12 and resistor R1103. Solder tins\u00a0and then solder the 0.02mm copper wire.
\n\"Scrape<\/p>\n

Apply some UV curable solder mast to the soldered copper wire\u00a0and put the logic board under the UV dryer lamp for 15 minutes.
\n\"Apply<\/p>\n

Reball the audio IC with BGA reballing stencil.<\/p>\n

\"Reball<\/p>\n

Apply some BGA paste flux to the bonding pad.<\/p>\n

Then align the audio IC to the right place\u00a0and blow it with a hot air gun at 280 degrees.
\n\"Apply<\/p>\n

Once the logic board is cooling enough, clean it with PCB cleaner.<\/p>\n

\"Once<\/p>\n

Assembler le t\u00e9l\u00e9phone et le tester.<\/p>\n

\"Assembler<\/p>\n

Touch function and record function back to normal.<\/p>\n

\"Touch<\/p>\n

For more details on iPhone Frozen Screen Repair guide.<\/p>\n