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Samsung A20 phone block diagram contains lines like CODEC MCLK, I2S, Water_det, MAIN MIC, SUB MIC, Volume UP, Volume Down Power On, I2C(sensor), I2C(EEPROM), FCAM_MIPI, IC 6030 CAM PMIC, USB , UART, I2C, VBAT (To System), V_BATTERY, OVP, IF_PMIC_JIGONB_N, VBAT SENSE and VBUSDET. These lines connect the CPU, camera sensors, charge controller, battery, and OVP switch. Understanding these lines is an important step to be able to repair a mobile device.
1. ANT: Antenna
2. AP: Application Processor
3. BB: Baseband
4.BT:Bluetooth
5. BTC (BATTERY CONNECTOR): Battery connector
6. BUTTON POWER KEY: Power button
7. VOL BUTTON: Volume button
8. C: Capacitor, Capacitor
9. CAM: Camera
10. CLK/SCL/clock): Clock
11. CP: Call Processor
12. CPU: Processor
13. D: Diode
14. DATA/SDA(Data): Data
15. DN, D-DATA_N: Negative data line
16. DP, D+,DATA_P: Positive data line
17. FCAM: Front camera
18. FL: Filter
19.GND:Ground
20. I2C: Communication protocol
21. I2S: Sound/audio protocol
22. ID: Identification
23.IN: Input
24. L: Coil, Inductor
25. LDO: Low Differential Regulator
26. OSC: Oscillator
27. OUT: OUTPUT
28. PA (POWER AMPLIFIER): Power amplifier
29. PAM: Power Amplifier Module
30. Q: Transistor
31. R: Resistance
32. RCAM: Rear camera
33.RST:Reset
34. RX: Reception
35. SPI: Communications Protocol
36. STROBE: Flash
37. SYNC: Synchronization
38. TH/TR: Thermistor
39. TP: Test Point
40.TX: Transmission
41.U:CI
42. V: Voltage
43. VBATT: Battery voltage
44. VBUS: usb protocol voltage
45. VCC: Positive supply
46. VDD: Positive supply
47. VR: Varistor
48. VSS: Negative supply
49. WLAN: Wi-Fi
50. XTAL: Crystal Oscillator
51. ZD: Zener diode
52. ANTENNA SWITCH: Antenna switch
53. ANTI-ROLLBACK,EEPROM: Store IMEI
54. AVDD: Analog voltage
55. B2B: Connector
56. BATTEMP: Battery temperature
57. BATTID: Battery identification signal
58. BBPMU (BASE BAND PMU): BaseBand power supply
59. BI: Communicates in both directions
60. BOOST: Line voltage booster
61. BOOTSTRAPPING: Power On and Verification Process
62. BUCK: Line voltage reducer
63. CARBON: Controls the accelometer and gyroscope
64. CHESTNUT (DISPLAY PMU): Display power supply
65. CODEC, AUDIO CODEC: Audio Driver IC
66. COMPASS: Location and orientation
67. CUMULUS: Communication IC between CPU and touch
68. DEBUG: Debug protocol
69. DET: Detection signal
70. DETECT: Detection
71.DEVICE: Device
72. DIGITAL I/O: Digital input and output
73. DOCKFLEX: Load flex
74. DOWN: Down
75. DSDS: In charge of synchronizing data and clock
76. DVDD: Digital Voltage
77. EN: Activation signal
78. FR: Radio frequency
79. GPIO: General Purpose Input and Output
80. GPU: Graphics processor
81. HB: High Band
82. HEADPHONE: Hands-free
83. HOLD_KEY_L: Home button signal
84. HOST: Connected devices
85. HWEN: Circuit or peripheral activation signal
86.J: FPC connector
87. LB: Broadband
88. LCM: lcd screen
89. LED DRIVER: LED Driver IC
90.MAIN: Main
91. MB: Medium band
92. MENU_KEY_L: Home button signal
93. MESA,MESAID: footprint
94. MESON/SAGE: Circuit that drives the touch
95. MIPI: Communication hub between an accessory and processor
96. MISO: Master Input Slave Output
97. MOSI: Master Output Slave Input
98. NFC: Near Field Communication or Wireless Communication
99. OSCAR: Circuit that drives GPIO
100. PCIE: Internet Protocol Communication
101. PMU: Power Supply
102 PP: Test Point
103. RDY;READY: Ready or prepared
104. RXD: Receive data
105. SDI: Serial Digital Interface
106. SIM: SIM card
107. SPEAKER AMP: Audio amplifier
108.SPEAKER: Speaker
109. STOCHHOLM: NFC Circuit
110. STROBE DRIVER: Flash controller
111. TIGRIS(VBUS PROTECTION IC): Load Protector IC TO: Going in a certain direction TRISTAR (USB CONTROLLER IC): USB Controller IC
112.TXD: Data transmission
113. UART: Universal Asynchronous Receiver Transmitter
114.UP: Up
115. VDD_MAIN: Main supply voltage
116. VDD: Positive supply
117. SPEED: High voltage
118. VOLTAGE PROPERTIES: Important voltage table
119. VREF: Reference voltage
120. VREG: Regulated Voltage
121. WAKE: Signal that turns on or wakes up a circuit or peripheral
122. WTR: Transceiver, band selector
123. XW: Internal bridge between the layers of the motherboard
PMIC_PWR_HOLD: PowerManagementIntegratedCircuit_PoWeR_HOLD (Hold)= is the signal to maintain or hold the power on of the PMIC
POWER KEY FPCB: the same name says it Power Button on the Flexible Printed Circuit Board (flexible circuit board)
PBAVBUS_IF_5P0: Printed Board Assembly VBUS IF (both are current sources) 5P0 here the P is a point (5.0)