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P525 Repair Reference Guide

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 Repair Reference Guide

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  1. P525 Repair Reference Guide CSC GTC

  2. P525 Block Diagram Over View

  3. P525 Specification

  4. P525 PCB Top Side U196 U913 U909 CON5 U41 U901 U8 U9 U7 U907 U1 CON12 U908 U20 TOP

  5. 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

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

  7. 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

  8. 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

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

  10. 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

  11. Charging circuit # 2

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

  13. 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

  14. 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

  15. Power & Key pad

  16. 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

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

  18. 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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