Page 102 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

EXERCISE 142: Replace Various ICs on mobile handsets

Objectives

At the end of this exercise you shall be able to:
• to perform precise soldering and desoldering on mobile PCBs
• to perform replacements of ICs without damaging nearby components during the process.
• for technicians and DIY enthusiasts, IC replacement offers a chance to learn and hone soldering skills
• It’s a practical application of electronics knowledge.

Requirements

Tools/ Materials Equipments
• Soldering Iron - 1 No. • Soldering and anti-static measures - 1 No.
• Magnifying Glass or Microscope - 1 No. • Solder Wire - as reqd.
• Flux and Solder - 1 No. • Fine-Tip Tweezers - 1 No.
• PCB Holder or Third Hand Tool - 1 No. • Multimeter - 1 No.
• Chip Extractor,Hot Air
Rework Station - 1 No.

Procedure

Theory
Integrated circuits (ICs) are miniature electronic components that combine multiple electronic functions onto a
single chip. They serve as the “brains” of our devices, handling tasks such as processing, power management,
audio, and communication.
Types of Replaceable ICs in Mobile Phones

Power IC (PMIC): Responsible for managing power distribution, charging, and voltage regulation.
Audio IC: Handles audio input/output, including speakers, microphones, and headphone jacks.
Touch Digitizer IC: Enables touch functionality on the screen.
Other ICs specific to certain phone models.
Identifying Damaged ICs
Your phone may exhibit different symptoms based on the damaged IC:

Power IC: Phone won’t turn on.
Touch Digitizer IC: Touchscreen won’t work.
Audio IC: No audio output.
Inspect the phone’s PCB (printed circuit board) for visible burn marks on the ICs.

Use a multimeter to detect short circuits and identify damaged ICs.
Can You Replace ICs Yourself?
Replacing ICs requires specialized soldering and desoldering equipment.
It’s not recommended to attempt this without proper tools and expertise.
Opening your phone might void its warranty.

Where to Get ICs Replaced
Official Repair Service
iPhones: Send them to an Apple-authorized service center or visit an Apple store.
Android phones: Send them to the manufacturer’s official repair service or an authorized agent.

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