Team Tekno World ke free mobile repairing course mein aapka swagat hai! Main hoon Rakesh Chauhan, aur yeh humara Lesson 20 hai.
Aaj hum seekhenge Mobile Display Repair ki asli takneek.
Grahak ki shikayat: “Bhaiya, phone gir gaya tha. Call aa rahi hai, vibrate ho raha hai, lekin screen kaali (Black) hai.”
Zyadatar technicians bas naya folder laga kar dekhte hain. Lekin agar naya folder lagane par bhi display na aaye, toh iska matlab fault Motherboard mein hai.
Aaj hum seekhenge: VSN/VSP Voltage, 1.8V Line aur MIPI Filters ko check karna.
Step 1: Physical Diagnosis (Bina Khole)
Sabse pehle confirm karein ki phone zinda hai ya nahi.
- Vibration/Sound: Agar call karne par ring baj rahi hai, toh phone ON hai. Fault sirf Display Section ka hai.
- Torch Test: Andhere mein screen par torch maarein. Agar halka sa graphics (photo) dikh raha hai par light nahi hai, toh yeh Light Section ka fault hai (Lesson 21 mein seekhenge). Agar poora kaala hai, toh yeh Graphic Fault hai.
Step 2: Basic Repair (Cleaning)
40% Mobile Display Repair cases sirf safai se solve ho jaate hain.
- Phone kholein.
- Display Connector ko microscope/magnifying glass se dekhein.
- Agar wahan Carbon/Fungus hai, toh usey IPA se saaf karein.
- Connector ki pins agar tedhi hain, toh unhein seedha karein.
Step 3: Voltage Checking (Graphic Section) – [Hot Testing]
Agar naya folder lagane par bhi display nahi aayi, toh Multimeter uthayein. Phone ON karein (Charger lagayein). Display Connector par ye 3 Voltages aane zaroori hain:
- VIO 1.8V (Logic Voltage):
- Sabse pehle connector ke paas ek capacitor par +1.8V check karein. Yeh CPU se aata hai display ko “Jagaane” ke liye.
- VSP (Positive Voltage):
- Graphic IC se +5.0V se +6.0V aana chahiye.
- VSN (Negative Voltage):
- Graphic IC se -5.0V se -6.0V aana chahiye.
Result:
- Agar 1.8V gayab hai = Power IC fault.
- Agar VSN/VSP gayab hai = Graphic IC fault.
Step 4: MIPI Filters Check (Data Lines) – [Pro Tip]
Agar saare voltages aa rahe hain, fir bhi Blue Screen ya No Display hai, toh Data Lines check karein.
Display connector ke paas 5 jode (pairs) chhote Coils/Resistors hote hain, jinhein MIPI Filters kehte hain. Yeh CPU se photo (data) lekar screen tak pahunchate hain.
- Check: Multimeter ko Beep Mode par rakhein. In coils ke dono side check karein.
- Result: Har coil par Beep aani chahiye.
- Fault: Agar koi coil beep nahi kar rahi (Open hai), toh graphics nahi aayenge. Usey badal dein ya Jumper maar dein.
Step 5: Common Faults & Solutions Table
| Fault | Kahan Check Karein? | Solution |
| Black Screen (Phone ON) | VSN (-5V) & VSP (+5V) | Replace Graphic IC / Coil |
| Blue / White Screen | MIPI Filters / CPU Connection | Check Filters / Reball CPU |
| Lines on Screen | LCD Internal Damage | Change Folder (Display) |
| Display Flickering | Loose Connector / Software | Clean Connector / Update |
Conclusion (निष्कर्ष)
Mobile Display Repair sirf folder badalna nahi hai.
- Pehle Cleaning.
- Fir 1.8V check.
- Fir VSN/VSP (+5V/-5V) check.
- Aakhri mein MIPI Filters (Data) check.
Jo technician in 4 steps ko follow karega, wo kabhi fail nahi hoga.
💡 Aaj Ka Aapka Task – Lesson 20 (Comments & Forum)
- Practical: Apne practice board par Display Connector ke paas chhote MIPI Filters (Coils) ko dhoondhein. Wo hamesha jodo (pairs) mein hote hain.
- Comment (नीचे): Kya aapne kabhi VSN/VSP Voltage check kiya hai? Yes/No likhein.
- Forum: Agar voltages sahi hain par display nahi aa rahi, toh board ki HD photo Forum (forum.teamtw.in) par daalein.
“Ab jab humne Graphics Section ko master kar liya hai aur screen par image banni shuru ho gayi hai, toh ek nayi samasya aa sakti hai—Graphics toh hain, lekin screen par bilkul andhera hai! Bina light ke woh graphics kisi kaam ke nahi.
Isiliye, hamara agla lesson bohot crucial hai. Hum seekhenge ki kaise ‘Backlight Section’ kaam karta hai aur kaise usse ‘Boost Voltage’ dekar screen ko roshan kiya jaata hai. Chaliye shuru karte hain: Lesson 21: LCD Light Problem Solution.”
