EivoTech Laptop & Mobile Repair Master Course
Mobile Repair Course — Part 31
Professional Mobile Repair Shop Diagnostic Workflow + Customer Device Handling + Final QC
Chapter 31: Professional Repair Shop Mein Device Receive Hone se Customer ko Return Karne Tak Complete System
Mobile repair sirf motherboard repair ka naam nahi.
Professional technician ko 3 cheezen equally important samajhni chahiye:
DIAGNOSIS + DOCUMENTATION + CUSTOMER TRUST
Agar repair technically perfect ho lekin:
Device condition note nahi ki
Customer complaint clear nahi likhi
Data importance confirm nahi ki
Approval nahi li
Final QC nahi ki
to shop mein unnecessary problems aa sakti hain.
Professional master workflow:
INTAKE → VERIFY → DOCUMENT → DIAGNOSE → APPROVE → REPAIR → QC → RETURN
1. Device Intake Kya Hai?
Jab customer phone shop par deta hai, us waqt jo initial process hota hai usay:
DEVICE INTAKE
keh sakte hain.
Yahi professional repair workflow ka first stage hai.
2. Intake ka Goal
Phone receive karte waqt clear record hona chahiye:
Customer complaint
Device model
Physical condition
Existing damage
Accessories received
Data importance
Previous repair history
3. Customer Complaint Exactly Likho
Customer agar bole:
“Phone dead hai.”
Record:
Customer Complaint: Phone ON nahi ho raha.
Diagnosis baad mein.
4. Complaint aur Diagnosis Separate Rakho
Customer complaint:
“Charging nahi hoti.”
Technician diagnosis:
“USB-C CC1 protection path fault.”
Dono same cheez nahi.
5. Don't Promise Fault Before Diagnosis
Customer phone deta hai.
Immediately mat bolo:
“PMIC kharab hai.”
Pehle diagnose karo.
6. Device Identification
Record:
Brand
Model
Storage variant if relevant
Color
IMEI/serial only where legitimately needed for job record
Device physical identity
Customer device identity ko responsibly handle karo.
7. IMEI ka Correct Use
IMEI/serial useful ho sakta hai:
Device identification.
Repair record.
Parts compatibility.
But:
Never alter/clone/spoof device identity.
8. Accessories Received
Clearly write:
Phone only
Charger
Cable
SIM
Case
Memory card
9. Accessories Kyun Record Karein?
Later confusion avoid:
“Main charger bhi diya tha.”
Professional record solves disputes.
10. SIM Card
Normally customer ko SIM remove karke dena better ho sakta hai unless network diagnosis ke liye legitimately required ho.
If kept:
Document it.
11. Memory Card
Same.
If not needed:
Customer ko return before repair where practical.
12. Device Physical Condition Record
Before opening:
Inspect:
Screen crack
Back glass crack
Camera glass
Frame dent
Buttons
Charging port
Missing screws
Existing marks
13. Existing Damage Important
Example:
Customer gives phone with already cracked back.
Agar note nahi kiya:
Later customer may think shop damaged it.
14. Intake Photos
Clear photos can document:
Front
Back
Sides
Existing cracks
Useful professional practice.
15. Don't Access Personal Content Unnecessarily
Customer device privacy respect karo.
Repair ke liye jitna required ho utna hi access.
16. Customer Password
Agar functional testing ke liye unlock required ho:
Customer se legitimate permission lo.
Alternative:
Customer khud unlock karke test kar sakta hai.
17. Password Record Security
Avoid casually writing sensitive passwords on visible paperwork.
If temporarily required:
Handle securely and delete/return appropriately after job.
18. Account Security
Never ask for:
Apple ID password unnecessarily
Google account password unnecessarily
Banking credentials
Social-media passwords
Hardware repair ke liye generally ye required nahi.
19. Security Locks
If phone has:
Activation Lock
FRP
Account verification
Professional repair shop ka role:
Legitimate owner ko official recovery process ki taraf guide karna.
Bypass nahi.
20. Data Importance
Before any work that could affect data:
Ask:
“Data important hai?”
21. Data Priority Categories
Could note:
Data Critical
Customer absolutely needs data.
Data Preferred
Data desirable but repair more important.
Data Not Important
Customer authorizes erase if required.
22. Data-Critical Phone
Avoid unnecessary:
Factory reset
Restore
Storage replacement
Major destructive rework
23. Data Authorization
Before any operation likely to erase data:
Explicit approval lo.
24. Backup Recommendation
If phone still works:
Customer ko backup recommend karo before risky repair.
25. Shop Should Not Guarantee Data
Especially:
Water damage
Storage failure
Severe board damage
Honest expectation set karo.
26. History Taking
Ask:
Kab fault start hua?
Drop hua?
Liquid?
Previous repair?
Battery/display recently changed?
Firmware update ke baad?
27. History Diagnostic Value
After Drop
Physical/connector/board.
After Liquid
Corrosion/leakage.
After Repair
Touched area.
After Update
Software/firmware.
28. Previous Repair
Ask:
“Pehle kis cheez ki repair hui thi?”
29. Previous Repair Signs
Inspect:
Flux
Missing shields
Scratched pads
Replaced IC
Jumper wires
Missing components
30. Never Insult Previous Technician
Keep professional.
Just document:
“Previous board work visible.”
31. Device Power State Intake
Before opening note:
Turns on?
Logo?
Boot loop?
Charging?
Vibration?
USB detection?
32. Quick Functional Intake Test
If phone boots:
Check basic:
Display
Touch
Cameras
Speaker
Mic
Charging
Network
This gives baseline.
33. Baseline Important
Suppose phone came for battery.
After repair customer says:
“Camera pehle sahi thi.”
If you tested intake:
You know actual pre-repair status.
34. Non-Working Features Before Repair
Record:
Camera already dead
Fingerprint already dead
Speaker weak
Back glass cracked
35. Water-Resistance Expectation
Opening phone may affect original sealing/water resistance.
Customer expectation clear rakho.
36. Diagnostic Fee
Shop policy may have:
Free basic check
Paid advanced diagnosis
Board-level diagnostic charge
Whatever policy ho, upfront clear rakho.
37. Diagnosis Before Quote
If fault unknown:
Don't give exact repair price too early.
Use:
“Diagnosis ke baad final estimate.”
38. Estimate Should Include
Fault
Required part/work
Estimated cost
Data risk if any
Approx repair category
39. Approval Before Expensive Repair
Especially:
Board-level work
Expensive display
Major IC replacement
Customer approval first.
40. Approval Record
Can be:
Written
WhatsApp message
Shop software record
Useful for clarity.
41. Don't Replace Parts Without Need
Professional shop should avoid:
“Try part and charge customer.”
Diagnosis-driven repair better.
42. Parts Quality Levels
Example:
Original service part
Original pull
High-quality compatible
Budget aftermarket
Clearly tell customer what is being used.
43. Don't Mislabel Parts
Aftermarket part ko “original” mat bolo.
Trust long-term business asset hai.
44. Part Warranty
Shop policy clear:
What is covered?
What isn't?
45. Physical Damage Warranty
Example:
New display installed.
Later cracked by impact.
Normally workmanship warranty and physical damage separate.
46. Liquid Damage Warranty
Liquid-damaged boards unpredictable ho sakte hain.
Clearly explain higher comeback risk.
47. Repair Job Number
Every phone ko unique:
JOB ID
do.
48. Job ID Benefits
Tracks:
Device
Customer
Fault
Parts
Technician
Status
49. Example Job Record
Job ID: EV-0001
Model: ______
Complaint: ______
Condition: ______
Data Important: Yes / No
Estimated Fault: ______
50. Repair Status Stages
Useful shop statuses:
Received
Diagnosing
Awaiting Approval
Awaiting Part
Repairing
QC
Ready
Returned
51. Don't Mix Customer Parts
Organize every device's:
Screws
Shields
Flexes
Parts
separately.
52. Parts Tray
Each job ko separate tray/container.
53. Screw Organization
Wrong screw can damage motherboard/display.
Keep exact locations organized.
54. Before Opening Device
Power down if possible.
Disconnect charger.
Follow correct disassembly procedure.
55. Battery Disconnect
Internal board work se pehle battery isolate.
56. Swollen Battery
If swollen/damaged:
Stop normal work.
Handle as battery safety issue.
Never puncture/compress/heat.
57. Liquid Device Intake
If wet/recent liquid exposure:
Do not repeatedly power or charge.
Power isolation first.
58. Diagnosis Order
Professional hierarchy:
EXTERNAL → MODULE → PHYSICAL → POWER → CONTROL → FIRMWARE → MAJOR IC
59. Why External First?
Because common faults include:
Charger
Cable
Battery
Screen
Camera module
Easy to verify.
60. Why Major IC Last?
Because:
More risk
More cost
More time
Lower certainty without evidence
61. No-Power Shop Workflow
Customer complaint confirmed.
↓
Known-good battery/input.
↓
Main rail.
↓
Standby.
↓
Power key.
↓
Startup rails.
↓
Boot activity.
62. No-Charging Shop Workflow
Known-good charger/cable.
↓
Port.
↓
VBUS.
↓
Protection.
↓
Charger.
↓
Battery.
63. No-Display Shop Workflow
Boot prove.
↓
Known-good screen.
↓
Connector.
↓
Power.
↓
Reset.
↓
Data.
64. Network Shop Workflow
SIM status.
↓
Baseband.
↓
Antenna.
↓
RF.
65. Audio Shop Workflow
Exact function.
↓
Known-good module.
↓
Power/control.
↓
Amp/codec.
66. Camera Shop Workflow
One/all camera?
↓
Known-good module.
↓
Power.
↓
Reset.
↓
I2C/MCLK/data.
67. Record Measurements
Before replacing component:
Write:
Rail
Voltage
Resistance
Diode value
State
68. Why Measurements Matter?
If repair fails:
You can compare before/after.
69. Last Good / First Missing
Every board diagnosis record mein useful.
70. Example
Last Good: PMIC VIN
First Missing: 1.8V standby
This is far better than:
“Board issue.”
71. Root Cause Record
At end:
Not just “fixed”.
Write:
“USB-C CC1 protection component faulty.”
72. Repair Action Record
Example:
“Replaced damaged charging sub-board.”
73. Parts Used
Record:
Part name
Quality/type
Supplier if needed
Cost internally
74. Donor Parts
If donor-board component used:
Document internally.
75. Microsoldering Before/After Photos
Useful for:
Quality control
Training
Customer proof where appropriate
76. Don't Share Customer Data in Repair Content
If making EivoTech videos:
Hide:
Phone number
IMEI
Notifications
Photos
Messages
Customer name
77. Customer Permission for Content
If using customer's device in public repair content:
Obtain appropriate permission and protect private information.
78. Device Labels
Avoid labels that reveal sensitive personal information publicly.
79. Repair Bench Cleanliness
A clean bench prevents:
Lost screws
Debris shorts
Mixed parts
Scratches
80. ESD Awareness
Modern phone ICs can be sensitive to electrostatic discharge.
Use proper ESD-safe working habits.
81. Tool Inspection
Check:
Probe tips
Soldering tip
Hot-air nozzle
Microscope
USB cables
Faulty tools create false diagnosis.
82. Known-Good Parts Shelf
Useful shop inventory:
Test displays
Batteries
Charging sub-boards
Speakers
Cameras
Cables
for common models.
83. Mark Known-Good Parts
Never mix test-good and defective parts.
Label clearly.
84. Known-Good Doesn't Mean New
Known-good means:
Function verified.
85. Diagnostic Donor Board
Same-model dead boards can help with:
Component location
Donor components
But measurements should preferably compare with actual working board where possible.
86. BoardView/Schematic Record
Save correct schematic/BoardView reference by model/board number.
87. Wrong Schematic Risk
Different board revision can have different rails/components.
88. Part Compatibility Database
Professional shop can maintain:
Model → compatible screen/battery/port/camera.
89. Repair Notes Database
Over time build:
FAULT → MEASUREMENTS → ROOT CAUSE → REPAIR
database.
90. Repeat-Fault Advantage
Next time same model comes:
Previous notes save diagnostic time.
91. Diagnosis Confidence
Use confidence levels internally:
Suspected
Strongly Suspected
Confirmed
92. Don't Tell Customer “Confirmed” Too Early
Only when evidence supports.
93. Confirmation Test
Example:
Suspected battery.
Known-good battery solves problem.
Now confirmed.
94. Board Fault Confirmation
Example:
Short disappears after specific module removed.
Strong confirmation.
95. Repair Approval Workflow
DIAGNOSE → EXPLAIN → PRICE → APPROVAL → REPAIR
96. Customer Explanation Style
Use simple language.
Instead of:
“PP1V8_S2 rail short.”
Say:
“Motherboard ke power section mein short mila hai.”
Technical details internal notes mein rakho.
97. Don't Overpromise
Avoid:
“100% data recover ho jayega.”
Especially severe board/storage faults.
98. Don't Create Fear
Professional factual explanation.
No dramatic language.
99. If Repair Not Economical
Tell customer honestly.
Sometimes replacement makes more sense.
100. Repair vs Data Recovery
Different goals.
Phone economically unrepairable ho sakta hai but data-important repair still justified.
101. After Repair — QC Starts
Repair complete bolne se pehle:
FULL QUALITY CONTROL
102. QC Kya Hai?
QC:
QUALITY CONTROL
Phone ke relevant functions systematically test karna.
103. Basic QC Checklist
Test:
Power on/off
Charging
Display
Touch
Buttons
Speaker
Mic
Earpiece
Cameras
Wi-Fi
Bluetooth
Cellular
104. Extended QC
Also:
GPS
NFC
Sensors
Vibration
Flash
USB data
Fast charging
depending device.
105. Charging QC
Check:
Charger detected
Percentage increases
Port stable
USB-C both orientations
Fast charge if supported
No abnormal heating
106. Display QC
Check:
Full image
Brightness
Touch all areas
No lines/flicker
Sleep/wake
107. OLED QC
Look for:
Green tint
Lines
Flicker
Touch
High-refresh behavior where applicable
108. LCD QC
Check:
Backlight uniformity
Brightness
Touch
Image quality
109. Camera QC
Test:
Front
Rear
All lenses
Autofocus
OIS
Video
Flash
110. Audio QC
Test:
Loudspeaker
Earpiece
Microphones
Voice recorder
Call audio
111. Network QC
Test:
SIM detection
Signal
Call
SMS where appropriate
Mobile data
112. Wi-Fi QC
Test:
Connect
Range
2.4/5GHz as supported
113. Bluetooth QC
Pair known-good accessory.
Check range/basic stability.
114. GPS QC
Outdoor functional test where required.
115. NFC QC
Known-good tag/contact function where device supports it.
116. Sensor QC
Test:
Proximity
Auto-brightness
Rotation
Compass where needed
117. Button QC
Test:
Power
Volume
Mute/action button where applicable
118. Vibration/Haptic QC
Check actual function.
119. USB Data QC
Charging repair ke baad:
Computer detection test useful.
120. Battery QC
Observe:
Percentage stability
Charging
No random shutdown
No abnormal temperature
121. Repair-Specific Extended Test
If phone repaired for random restart:
Short 30-second test enough nahi.
Trigger original fault conditions where safe.
122. Example
Original restart during camera.
Post-repair:
Use camera.
Video.
Switch lenses.
Confirm stability.
123. Call Restart Repair
Post-repair:
Test cellular call/data under normal conditions.
124. Boot-Loop Repair
Multiple cold boots/restarts useful.
125. No-Power Repair
Test:
Power on
Power off
Restart
Charging
Standby
126. Liquid Damage QC
Most extensive QC.
Because multiple faults possible.
127. Liquid Repair Test
Check nearly every accessible function.
128. Thermal QC
Ensure:
No unusual heating during idle/charge/function.
129. Don't Judge Heat by Touch Alone
Compare behavior and use proper safe tools where needed.
130. Final Visual Inspection
Before assembly:
Microscope repaired board.
Check:
Bridges
Flux/debris
Missing components
Flex seating
131. Screw Check
All correct screws in correct positions.
132. Connector Check
Ensure:
Battery
Display
Cameras
Antenna
Flexes
properly seated.
133. Adhesive/Seal
Use correct assembly method.
Don't promise original factory water resistance unless actually certified procedure supports it.
134. Final Cleaning
Remove:
Fingerprints
Flux residue externally
Dust
Return phone professionally.
135. Customer Return Test
If possible:
Customer ke samne repaired function show karo.
136. Return Explanation
Explain:
What was faulty
What was repaired
Any remaining issue
Warranty terms
137. Be Honest About Remaining Faults
Example:
Charging fixed.
But original cracked camera glass still there.
Mention it.
138. Return Accessories
Check received accessory list.
Return all.
139. Remove Shop Test Accounts
Never leave:
Test Wi-Fi data
Shop accounts
Temporary settings
that aren't required.
140. Customer Privacy Final Check
Ensure no customer data copied/stored unnecessarily.
141. Repair Photos/Data Retention
Keep only what legitimate shop records require.
Protect customer privacy.
142. Comeback Kya Hai?
Customer returns because:
Same fault returned
New fault appeared
Repair incomplete
143. Comeback Prevention
Best method:
FULL QC + GOOD DOCUMENTATION
144. Common Comeback Cause 1
Only repaired function tested.
Other disturbed connector not checked.
145. Common Comeback Cause 2
Cheap/poor replacement part.
146. Common Comeback Cause 3
Underlying root cause not fixed.
Example:
Fuse replaced but downstream short remained.
147. Common Comeback Cause 4
Liquid damage multi-fault ignored.
148. Common Comeback Cause 5
Intermittent fault not tested long enough under normal function.
149. Warranty Comeback Workflow
Don't argue first.
Check:
Device condition
Same fault?
Physical/liquid damage?
Repair notes
Then diagnose.
150. Good Repair Database Fields
Job ID: __________
Date: __________
Model: __________
Board Number: __________
Complaint: __________
History: __________
Physical Condition: __________
Data Priority: __________
Diagnosis: __________
Last Good: __________
First Missing: __________
Root Cause: __________
Parts Used: __________
Repair Action: __________
QC: __________
Warranty: __________
151. Device Intake Form
Job ID: __________
Customer Name: __________
Contact: __________
Device Model: __________
Color: __________
Storage: __________
Customer Complaint: __________
Turns On: Yes / No
Charging: Yes / No
Display: __________
Touch: __________
Physical Damage: __________
Liquid History: __________
Drop History: __________
Previous Repair: __________
Accessories Received: __________
Data Important: Yes / No
Initial Photos: Yes / No
152. Diagnostic Sheet
Known-Good Battery: __________
Known-Good Display: __________
Known-Good Cable/Charger: __________
Affected Block: __________
Main Rail: __________
Last Good: __________
First Missing: __________
First Falling: __________
Resistance: __________
Diode Comparison: __________
Boot Mode: __________
Root Cause Direction: __________
153. Customer Approval Sheet
Diagnosis: __________
Repair Required: __________
Part Type: __________
Estimated Cost: __________
Data Risk: __________
Warranty Terms: __________
Customer Approval: __________
154. Repair Sheet
Technician: __________
Parts Used: __________
Board Work: __________
Before Reading: __________
After Reading: __________
Repair Completed: __________
155. Final QC Sheet
Power ON/OFF: ✅ / ❌
Charging: ✅ / ❌
Fast Charging: ✅ / ❌ / N/A
USB Data: ✅ / ❌
Display: ✅ / ❌
Touch: ✅ / ❌
Speaker: ✅ / ❌
Earpiece: ✅ / ❌
Mic: ✅ / ❌
Front Camera: ✅ / ❌
Rear Cameras: ✅ / ❌
Flash: ✅ / ❌
Wi-Fi: ✅ / ❌
Bluetooth: ✅ / ❌
SIM: ✅ / ❌
Calls: ✅ / ❌
Mobile Data: ✅ / ❌
GPS: ✅ / ❌ / N/A
NFC: ✅ / ❌ / N/A
Sensors: ✅ / ❌
Buttons: ✅ / ❌
Vibration: ✅ / ❌
Abnormal Heating: Yes / No
Final Status: __________
156. EivoTech Professional Shop Workflow
A professional EivoTech-style workflow can be:
1. RECEIVE
Phone receive.
↓
2. PHOTOGRAPH
Existing condition.
↓
3. VERIFY
Complaint confirm.
↓
4. HISTORY
Drop/liquid/repair/data.
↓
5. DIAGNOSE
Logical workflow.
↓
6. DOCUMENT
Measurements/root cause.
↓
7. APPROVAL
Customer price/repair approval.
↓
8. REPAIR
Only approved work.
↓
9. QC
Complete tests.
↓
10. RETURN
Explain + warranty + customer verification.
157. Professional Communication Rule
Customer ko technical confusion mat do.
Simple explain karo.
Example:
Technical internal diagnosis:
“1V8 sensor rail short from front flex.”
Customer explanation:
“Front sensor assembly motherboard ki power line ko short kar rahi thi.”
158. Don't Hide Mistakes
Agar repair ke dauran accidental damage ho:
Professional responsibility se handle karo.
Cover-up trust destroy karta hai.
159. Don't Blame Customer Without Evidence
Use recorded intake condition.
160. Don't Blame Previous Technician Without Proof
Focus current measurable fault.
161. Repair Ethics
Professional shop:
Customer data respect
Honest part quality
Honest diagnosis
No unnecessary replacement
No security bypass
No identity manipulation
162. Customer Trust Is Long-Term Asset
One repair profit se zyada valuable:
Customer ka trust + repeat business.
163. Common Beginner Mistake 1
Phone receive karte hi open karna without intake record.
164. Common Beginner Mistake 2
Existing cracks note na karna.
165. Common Beginner Mistake 3
Customer complaint ko diagnosis samajhna.
166. Common Beginner Mistake 4
Data importance na poochna.
167. Common Beginner Mistake 5
Approval se pehle expensive repair.
168. Common Beginner Mistake 6
Part quality clear na karna.
169. Common Beginner Mistake 7
Before/after measurements record na karna.
170. Common Beginner Mistake 8
Repair ke baad sirf phone ON check karna.
171. Common Beginner Mistake 9
Customer privacy ignore karna.
172. Common Beginner Mistake 10
Warranty policy unclear rakhna.
173. Shop Intake Golden Rules
1. Device condition record karo.
2. Customer complaint exact likho.
3. Drop/liquid/previous repair history lo.
4. Data importance confirm karo.
5. Accessories document karo.
6. Initial functions test karo where possible.
174. Diagnostic Golden Rules
1. External → Module → Physical → Power → Control → Firmware → Major IC.
2. Last Good → First Missing.
3. Restart = First Falling Point.
4. Known-good parts use karo.
5. Root cause prove karo before expensive work.
175. Customer Approval Golden Rules
1. Final fault/repair explain karo.
2. Price clear karo.
3. Part quality clear karo.
4. Data risk mention karo.
5. Approval record rakho.
176. Final QC Golden Rules
1. Phone ON hona enough nahi.
2. Repaired function ko full test karo.
3. Disturbed nearby functions bhi test karo.
4. Liquid phones ko full-device QC do.
5. No abnormal heating/charging instability ensure karo.
177. Customer Privacy Golden Rules
1. Personal data unnecessarily access mat karo.
2. Passwords/accounts unnecessarily collect mat karo.
3. Repair videos mein customer information hide karo.
4. Security locks ko bypass mat karo.
5. Original legitimate device identity preserve karo.
178. Part 31 Quick Revision
Intake
Device receive/document process.
Job ID
Unique repair tracking number.
Baseline Test
Repair se pehle existing function record.
Approval
Customer permission before repair/cost.
Root Cause
Actual originating fault.
QC
Quality Control after repair.
Comeback
Repair ke baad same/new problem ke saath return.
179. Part 31 ka Sabse Important Lesson
Professional mobile technician ka kaam sirf ye nahi:
“PHONE REPAIR KAR DO.”
Complete professional process hai:
RECEIVE
↓
VERIFY
↓
DOCUMENT
↓
DIAGNOSE
↓
CUSTOMER APPROVAL
↓
REPAIR
↓
FULL QC
↓
RETURN
Aur sabse important:
CUSTOMER KA DEVICE, DATA AUR TRUST — TEENO REPAIR KA PART HAIN.
Technical side par:
LAST GOOD → FIRST MISSING → ROOT CAUSE
Business side par:
DOCUMENT → APPROVAL → QC
follow karo.
Agar ye system strong ho jaye to shop professional lagegi, diagnostic mistakes kam hongi aur comeback cases bhi kam honge.
Mobile Repair Course — Part 31 Complete
Next — Mobile Part 32
Complete Mobile Repair Master Revision + All Fault Trees + Quick Reference
Part 32 mein hum Mobile Part 1 se Part 31 tak poore course ko ek master revision chapter mein convert karenge:
Complete smartphone architecture map
Power sequence master chart
No-power fault tree
Boot-loop fault tree
Short-circuit fault tree
Charging fault tree
Display/touch fault tree
Audio fault tree
Camera/sensor fault tree
Wi-Fi/Bluetooth/GPS/NFC fault tree
SIM/baseband/RF fault tree
Battery drain/heating fault tree
Schematic rules
Multimeter rules
Oscilloscope rules
Microsoldering rules
Shop workflow
Final master diagnostic formulas
Master formula:
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