Itel S25 Ultra Power On Off & Volume Keys Problem Solution | Button Ways | Strip Testing

Описание: This video shows the complete Itel S25 Ultra power on/off and volume keys problem solution, covering:

Power button not working

Volume up/down keys unresponsive

Keys stuck or broken

Button strip disconnected or damaged

Motherboard line or IC faults

The board-level repair tutorial includes button FPC/strip inspection, continuity testing, diode/filter checking, voltage tracing, jumper solutions, and connector repair.
Designed for mobile repair technicians for step-by-step professional hardware repair.

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🔧 30 Step-by-Step Repair Instructions

Power off Itel S25 Ultra

Remove SIM tray

Heat and remove back cover

Disconnect battery connector

Remove mid-frame screws

Inspect power button strip

Inspect volume up/down key strip

Test FPC flex continuity

Replace damaged strip if torn

Clean connector with IPA

Inspect connector pins for bending or corrosion

Apply pressure and test button

Check motherboard button input line

Measure pull-up voltage on key line

Check button grounding path

Test series diode/filter on button line

Replace open/damaged SMD components

Reflow cold solder joints on FPC connector

Test buttons with multimeter continuity mode

Check CPU input if buttons unresponsive

Reflow CPU IO pad if required

Replace flex connector if burned

Test strip with new flex if needed

Partially reassemble phone for testing

Test power key long press

Test volume up/down keys

Verify consistent key response

Fully assemble phone

Run QC test for buttons

Deliver phone after full testing

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