P525 repair reference guide
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P525 Repair Reference Guide. CSC GTC. P525 Block Diagram Over View. P525 Specification. P525 PCB Top Side. U196. U913. U909. CON5. U41. U901. U8. U9. U7. U907. U1. CON12. U908. U20. TOP. P525 PCB Bottom Side. U14. SW3. SW4. SW6. SW1. SW5. U39. SW7. U17. U18. U13. U6.

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P525 pcb top side
P525 PCB Top Side

U196

U913

U909

CON5

U41

U901

U8

U9

U7

U907

U1

CON12

U908

U20

TOP


P525 pcb bottom side
P525 PCB Bottom Side

U14

SW3

SW4

SW6

SW1

SW5

U39

SW7

U17

U18

U13

U6

CON14

CON3

CON4

J1

CON2

CON1

CON6

SW2

CON7

Bottom


P525 flash memory circuit refresh rom error
P525 Flash Memory Circuit -Refresh ROM ERROR

PS:D/L Boot code or OS need plug the ACAdaptor


Ear phone circuit
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


On board mic 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


Speaker amp circuit
Speaker & Amp Circuit

Speaker Amplifier and Connector

Speaker fail please visual Inspect the :C18 C26 R65 R66 D2 D3 U42 C30 C31 U9 SPEAKER1


Mini usb connector and charging circuit
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



Sim card connector circuit
SIM Card connector Circuit

1.Check Diode value :CON4 U53;

2.try to Update Radio firmware;


Usb connector
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


Mini sd card circuit
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



Wireless
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


Flash led vibrator
Flash LED & Vibrator

Check the CON13 CON2 C209 C154 R10 R11 U35 C208 C207

U4 R148 U37 RN23 U62


Blue tooth power
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


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