Скачать или смотреть OPPO A78 4G Mic, Speaker & Buzzer Problem Solution | Complete Hardware Repair Guide in Urdu Hindi

In this video, we will show you how to fix OPPO A78 4G mic, speaker, and buzzer problems using a full hardware diagnosis and solution. If your voice is not going through calls, speaker sound is not working, or the phone is silent with no ringtone or media output, this guide provides detailed step-by-step repair instructions. Ideal for mobile technicians and learners!

📲 Covered Issues:

Mic not recording voice

Ear speaker no audio

Buzzer not ringing

IC, Jumper, and Connection Fix

🧰 30 Step-by-Step Instructions:
Switch off OPPO A78 4G.

Remove SIM tray and back cover.

Disconnect battery safely.

Remove all screws securing the motherboard shield.

Inspect the mic, speaker, and buzzer hardware.

Clean the board with isopropyl alcohol.

Check mic section near the USB charging board.

Use a multimeter to test mic line continuity.

Replace the mic if no continuity or broken.

Reflow the mic area using hot air station.

For speaker, test pads using a multimeter in buzzer mode.

If open circuit, trace lines to audio IC.

Replace ear speaker or buzzer as needed.

Test speaker with an external power supply.

Check continuity from speaker pads to IC.

Reflow speaker audio IC carefully.

Inspect for broken SMD components near IC.

Check mic, speaker, and buzzer filters.

Replace filters or jump if necessary.

Verify mic with voice recorder test.

Check speaker during a call.

For buzzer, test media volume and ringtone.

If no output, check sub-board and interconnector flex.

Replace sub-board if damaged.

Reconnect everything and reassemble.

Power on and test mic during a call.

Play music and check speaker clarity.

Test incoming calls for ringtone sound.

Use earphones to isolate mic/audio output tests.

Confirm everything is working and assemble.

📌 Hashtags:
#OPPOA78MicProblem #OPPOA78SpeakerRepair #OPPOA78BuzzerSolution #MicSpeakerFixUrdu #MobileHardwareRepair #OPPORepairGuide #MicNotWorkingFix #SpeakerNoSoundOPPOA78 #OPPOA78RepairUrduHindi #MobileMicBuzzerRepair