1. P525 Repair Reference Guide
CSC GTC

2. P525 Block Diagram Over View

3. P525 Specification System GSM 850 / 900 / DCS 1800 / PCS 1900 MHz
Dimensions
116.8 x 59 x 19 mm
Weight
160g（with battery）
Battery
1300 mAh Li-ion
Standby Time
150 hours
Talk Time
5 hours
Color
Black
Main Display
65,000-color, 2.8-inch TFT; 240 x 320 resolution
Phone Book
Unlimited number of number entries *Depends on available memory capacity
Messaging
MMS / SMS
Camera
2M-pixel with auto focus 5-level digital zoom Flashlight
Video Recording
No time limit *Depends on available memory capacity
Voice Recording
No time limit *Depends on available memory capacity
Ringtone
128 polyphonic ring tones (Midi、MP3、WMA、WAV)

4. Internal Memory
128MB built-in memory
Memory Card
Mini SD support; up to 2GB
JAVA
J2ME（CLDC MIDP 2.0)
Game
2 fun games included (Bubble Breaker、Solitaire)
Connectivity
mini USB
WAP
WAP / WAP2.0
Other Features
- Business card recognition - Numeric keypads - Quad-band (GSM / GPRS, WLAN b) + Bluetooth 2.0 (Bluetooth stereo headset) - H.263 / MPEG4 (3GP / MP4) / AAC - 15 fps QVGA video encode - Voice Recognition and Hand-free mode - Flight Mode - My Secret files for personal and sensitive files
Note
Specifications are subject to changes without prior notice

5. P525 PCB Top Side U1 U41 CON5 U9 U901 U8 U7 U907 TOP U20 U908 CON12
FLASH
U908
POWER
U901
Modem IC
U916
GSM IC
U913
TX RX SW
U909
Power Amp U1
CPU
U7 & U8
FLASH
U41
POWER IC U9
AUDIO
U20
Blue Tooth
CON5
MINI SD
CON2
Board TO Board U1
U20
U41
CON5 U9
U901 U8 U7
CON12
U908
U196
U913
U907
U909
TOP

6. P525 PCB Bottom Side U6 J1 U13 CON4 CON1 Bottom U14 U39 CON3 CON2 CON6
SIM
CON3
USB
CON2
Camera
CON6
KEY PAD
CON1
LCD
SW1
RESET
SW2
POEWR
SW3
Voice Record
SW4
Slider Up
SW5
Camera
SW6
Slider Down
U14
WLAN ANT
U13
WLAN
U17&U18 U6
FLASH
U39
POWER CON
U14
U13
CON2 J1
U39 U6
U17
CON14
CON4
U18
CON1
SW5
CON3
CON6
SW3
SW4
SW6
SW1
CON7
SW7
SW2
Bottom

7. P525 Flash Memory Circuit -Refresh ROM ERROR
PS:D/L Boot code or OS need plug the AC Adaptor

8. Ear Phone- If broken try to change to J1
Ear Phone circuit
Ear Phone- If broken try to change to J1
Ear phone Right CH abnormal:C189 C190 C114 C115 C117 C119 R58 R59 CE1 CE2 R62 R61 J1
Can’t Record on C189 C190 C114 C115 C117 C119 R58 R59 CE1 CE2 R62 R61 J1 Diode Value

9. On Board MIC –Phone Circuit
On Board MIC Circuit
On Board MIC –Phone Circuit
MIC Can’t record check the Diode value -> R63 R64 C127 C126 L1 C121 U9 C38 C116 U11

10. Speaker Amplifier and Connector
Speaker & Amp Circuit
Speaker Amplifier and Connector
Speaker fail please visual Inspect the :C18 C26 R65 R66 D2 D3 U42 C30 C31 U9 SPEAKER1

11. Mini USB Connector and charging circuit
Please check the Below Data
U24 pin 4,pin 6 = 4.74V
U5 pin3 = 3.4V T14 = 3.32V
Also check below component
U24 U30 U12 C192 C191 R129 R124 R101 R103 R127 R126 C171 D25 R24 R91 Q5 R33 R192 R188 R186 C231 C229 R187 R8 C128 R24 R180 C226 R181 R183 R184 R182 R185 R197 U40 C230

12. Charging circuit # 2

13. SIM Card connector Circuit
1.Check Diode value :CON4 U53;
2.try to Update Radio firmware;

14. Try to check CON3 C129 U24 Q5 C130 R24 R8 C191 R125 R127 C192 R124 U1
USB CONNECTOR
Try to check CON3 C129 U24 Q5 C130 R24 R8 C191 R125 R127 C192 R124 U1
Please change the CON3 if the Charging Fail

15. Mini SD card Circuit
Check the Diode Value: CON5 C211 R285 C212 R286 R151 C210 Q9 C204 C205 R157 R156 R155 R154 R153 C213 C214 R287 C215 R288

16. Power & Key pad

17. Wireless
Check the :U13 R228 C145 C146 U17 C185 R74 R75 R77 R78 U81 CON9 C42 L1 L2 C144 U14 U18 R81 R82 R44 C140 C141 C142 C143 R71 C137 R72R116 C139 RN11 R73 U15 U16 U25 U26

18. Flash LED & Vibrator
Check the CON13 CON2 C209 C154 R10 R11 U35 C208 C207
U4 R148 U37 RN23 U62

19. Blue tooth Power
Measure : X4 C162 C163 C158 R85 R86 R87 R88 R111 R96 R97 R93 R294 U15 U21 R14 C167 R112 U22 R295 R119 U23 L5 C155 C156 C157 R83 C159 R90 C164 C165 R104 R105 C187 D39 D38 C149 L7 U19 U82 R98 R99 R100 Q2 R107 R109 R110 R108 Q3 R113 R114 U20