Mobile Touch Not Working Solution: I2C Lines & Voltage Check | Lesson 22

Team Tekno World ke free mobile repairing course mein aapka swagat hai! Main hoon Rakesh Chauhan, aur yeh humara Lesson 22 hai.

Pichle 2 lessons mein humne Graphics aur Light ki samasyaon ko hal kiya. Ab baari hai Mobile Touch Not Working Solution ki.

Grahak ki shikayat: “Bhaiya, phone gira tha. Display aa rahi hai, lekin kahin bhi touch karo, kuch nahi ho raha.”

Mobile Touch Not Working Solution

Touch section repair karna thoda mushkil hai kyunki yeh I2C Protocol (Data Lines) par kaam karta hai. Aaj hum Mobile Touch Not Working Solution ka sabse professional tareeka seekhenge—kaise SCL, SDA, INT, aur RST lines ko check karke fault pakda jaata hai.

Step 1: Basic Diagnosis (Software vs Hardware)

Kisi bhi Phone touch problem hardware solution par jaane se pehle, basic check karein:

1. Force Restart: Sabse pehle phone ko Force Restart (Volume Down + Power button 10 second dabayein) karein. Kabhi-kabhi software hang hone se touch freeze ho jaata hai.
2. Folder Check: Agar restart se nahi hua, toh apna Testing Folder (Naya Combo) lagayein.
   • Agar naye folder mein touch chal gaya = Purana Folder Kharab.
   • Agar naye mein bhi nahi chala = Motherboard Fault.

Step 2: Touch Connector Voltage Check (1.8V) – [Hot Testing]

Touch ko kaam karne ke liye CPU se ek Logic Voltage chahiye hota hai. Agar yeh voltage nahi milega, toh touch IC “On” nahi hogi.

Action: Phone ON karein. Multimeter (20V) se connector ke paas capacitors par check karein.

• Check: Hamein +1.8V (VREG/VIO) milna chahiye.
• Result: Agar 1.8V nahi aa raha, toh Power IC se supply nahi aa rahi hai. (Power IC fault).

Step 3: SCL SDA Line Checking Mobile (I2C Protocol) – [Pro Level]

Agar voltage (1.8V) aa raha hai, fir bhi touch nahi chala, toh iska matlab CPU aur Touch IC ke beech data transfer nahi ho raha. Iske liye 4 lines zimmedar hoti hain:

1. SCL (Serial Clock): Ghadi ki tarah timing set karta hai.
2. SDA (Serial Data): Data aane-jaane ka rasta.
3. RST (Reset): Touch ko reset karne ka signal.
4. INT (Interrupt): CPU ko batane ke liye ki “kisi ne touch kiya hai”.

Kaise Check Karein (Cold Testing – Diode Mode):

1. Multimeter ko Diode Mode par rakhein.
2. Red Probe ko Ground par rakhein.
3. Black Probe se Connector ki pins (Schematic dekhkar) par check karein.
4. Reading: In charon lines (SCL, SDA, RST, INT) par 300 se 600 ke beech reading (GR Value) aani chahiye.

• Fault: Agar kisi line par “1” (OL) aa raha hai, toh CPU se connection toot gaya hai.
• Solution: Connector ke paas lage chhote Resistors ya Coils check karein. Aksar wo open ho jaate hain.

Step 4: Ghost Touch Solution (Apne aap chalna)

Agar touch apne aap kaam kar raha hai (Bhoot ki tarah), toh ise Ghost Touch kehte hain.

• Reason: Kharaab Charger (Current leakage) ya Folder ka earthing issue.
• Fix:
  1. Original Charger use karein.
  2. Agar fir bhi ho raha hai, toh Folder ke patte (Flex) par Silver Tape lagakar usey ground (Body) se touch karein. Isse extra static charge khatam ho jayega.

Summary Checklist

1. Force Restart karein.
2. Naya Folder check karein.
3. 1.8V Voltage check karein (Hot Testing).
4. GR Value (SCL, SDA, RST, INT) check karein (Cold Testing).
   • Value nahi hai = CPU/Resistor Fault.
   • Value hai = Touch IC/Folder Fault.

💡 Aaj Ka Aapka Task – Lesson 22 (Comments & Forum)

1. Practical: Apne multimeter se kisi chalu phone ke connector par 1.8V dhoondhne ki koshish karein.
2. Comment (नीचे): Kya aapne kabhi “Ghost Touch” (Bhoot wala touch) dekha hai? Yes/No likhein.
3. Forum: Agar GR value sahi hai par touch nahi chal raha, toh Schematic ka screenshot Forum (forum.teamtw.in) par share karein.

Agla Lesson: Screen ka kaam khatam! Ab hum “Connectivity” section shuru karenge. Sabse pehli aur badi problem: “Lesson 23: Network Problem Solution (No Service Fix)”।