Audio IC Repair: Speaker, Mic, Smart PA & Headphone Mode | Lesson 39

Team Tekno World ke free mobile repairing course mein aapka swagat hai! Main hoon Rakesh Chauhan, aur yeh humara Lesson 39 hai.

Aaj hum baat karenge Phone ki “Awaaz” (Sound Section/Audio IC Repair) ke baare mein.

Agar phone mein Display na aaye, toh shayad insaan ek baar ko adjust kar le, lekin agar Mic (meri awaaz na jaye) ya Speaker (dusre ki awaaz na aaye) kaam na kare, toh phone “Dabba” ban jaata hai.

Audio IC Repair: Speaker, Mic, Smart PA & Headphone Mode

Ek technician ke paas Sound faults 4 tarah ke aate hain:

1. No Sound: Bilkul awaaz nahi aa rahi.
2. Low Sound: Awaaz aa rahi hai par bahut dheemi.
3. Distorted Sound: Awaaz phat rahi hai (Speaker fatna).
4. Headphone Mode: Bina earphone lagaye nishan aa raha hai.

Aaj hum seekhenge complete Audio IC Repair—Component se lekar Smart PA aur Codec tak.

Step 1: Component Testing (Basic Level)

IC par jump karne se pehle, bahar ke parts check karein. 70% problems yahin solve ho jaati hain.

1. Ringer (Loud Speaker):

• Kaam: Ringtone, Music, YouTube sound.
• Test: Multimeter ko Ohm (Ω) Mode (200Ω) par rakhein.
• Reading: 6Ω se 10Ω ke beech aani chahiye aur Beep bajni chahiye.
• Fault: Agar Reading bahut zyada hai (e.g. 50Ω) ya OL hai = Speaker kharab hai.

2. Receiver (Earpiece):

• Kaam: Kaan par laga kar baat karna.
• Test: Ohm Mode. Iska resistance zyada hota hai: 25Ω se 35Ω.

3. Microphone (Mic):

• Analog Mic (2 Wire): Resistance 600-1200Ω.
• Digital Mic (3-5 Pins): Aajkal yahi use hote hain. Inhein Diode mode mein check karein.
  • VDD: Power (1.8V).
  • CLK: Clock Signal.
  • DATA: Data Signal.
  • GND: Ground.
  • Agar CLK ya DATA line open hai (OL), toh Mic change karne se kuch nahi hoga, CPU/Codec se track toota hai.

Step 2: Ringer IC vs Smart PA (Low Sound Solution)

Agar Speaker component theek hai par awaaz dheemi aa rahi hai ya phat rahi hai, toh shak Amplifier par jata hai.

Type A: Normal Ringer IC (Purane Phones):

• Choti 8-10 pin ki IC.
• Isey chalne ke liye VPH (3.7V) chahiye. Check karein ki capacitor par voltage aa raha hai ya nahi.

Type B: Smart PA (Naye 4G/5G Phones):

• Yeh IC awaaz ko Boost karti hai.
• The Boost Coil Logic: Smart PA ke bagal mein ek badi Boost Coil lagi hoti hai.
• Working: Jab gana bajta hai, ye IC 3.7V ko boost karke 8V se 10V banati hai.
• Fault: Agar awaaz “Phati hui” (Distorted) aa rahi hai ya bahut slow hai, toh 99% ye Boost Coil kharab hai. Isey badal dein.

Step 3: The Mastermind – Audio Codec (WCD93xx)

Agar Mic, Speaker, aur Receiver teeno ek saath band ho gaye hain, toh galti Speaker ki nahi, Audio Codec IC ki hai.

• Kaam: Yeh Digital signal (CPU se I2S line ke through) ko Analog (Speaker ke liye) mein badalti hai. Qualcomm mein iska naam WCD hota hai.
• Symptom:
  • Call lagane par Loudspeaker button Grey/Disable ho jaata hai.
  • Sound Recorder open karte hi “Recording Failed” error aata hai.
  • Phone restart karne par boot loop mein fas sakta hai (Audio IC loose hone par).
• Repair: Is IC ko Reball ya Replace karein.

Step 4: Headphone Mode Solution (Ghost Icon)

Agar screen par Headphone ka icon bana hua hai aur hat nahi raha, toh speaker se awaaz nahi aayegi kyunki phone soch raha hai earphone laga hai.

1. Cleaning: Jack ke andar Lint (Ruian) ya carbon saaf karein.
2. Detection Pin: Jack ke andar ki pin short ho gayi hai.
3. HPH_DET Line: Schematic mein “HPH_DET” (Headphone Detection) line dhoondhein.
   • Us line par laga Capacitor ya Resistor aksar paani jaane se short ho jaata hai. Usey nikaal (Remove) dein.
4. Software: Kabhi-kabhi “Lesser AudioSwitch” app se temporary kaam chalaya ja sakta hai, par permanent ilaaj hardware hi hai.

Summary Checklist

1. Impedance: Speaker (8Ω) aur Receiver (30Ω) OK hain?
2. VPH Power: Amplifier IC ko 3.7V mil raha hai?
3. Boost Voltage: Gana bajate waqt Boost Coil par voltage badh raha hai (8V+)?
4. Codec Test: Agar Speaker button Grey hai = Audio Codec Fault.
5. Headphone: HPH_DET line ka short capacitor hatayein.

💡 Aaj Ka Aapka Task – Lesson 39 (Comments & Forum)

1. Practical: Ek chalu phone mein gana bajayein aur Multimeter (DC 20V) se Speaker ke terminals par check karein. Voltage fluctuate (kam-zyada) hoga. Yahi audio signal hai.
2. Comment (नीचे): Kya aapne kabhi note kiya hai ki Water Damage phones mein Headphone Mode ki samasya sabse zyada aati hai? Yes/No likhein.
3. Forum: Agar Digital Mic ke tracks (CLK/DATA) par reading (GR) nahi aa rahi, toh board ka model Forum (forum.teamtw.in) par batayein. Hum jumper image denge.

Agla Lesson: Audio IC Repair ho gaya! 🎵 Ab baat karte hain mobile ki sabse complicated section ki—Network. Agar phone mein “No Service” ya “Emergency Only” aa raha ho, toh usey step-by-step kaise trace karein? Agla Lesson hai: “Lesson 40: Network Section (RF IC, WTR & PA) & No Service Solution”।