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Zhizhen Schematics

Zhizhen Schematics Features Explained: Bitmap, PCB Layout, Hardware Tracing & Diode Values

7 min read

Zhizhen Schematics — Feature Deep Dive

This article provides a detailed walkthrough of every feature in Zhizhen Schematics, explaining how each tool helps technicians diagnose and repair hardware faults at the component level.

Bitmap — Multi-Layer Board Imaging

What It Does

The Bitmap feature provides crystal-clear high-resolution images of the device's motherboard. Unlike a simple photo, Zhizhen's bitmap is an interactive multi-layer view — you can toggle between the top side, bottom side, and internal layers of the PCB to trace signal paths that pass through vias (holes connecting layers).

How Technicians Use It

  • Short circuit diagnosis: When a board has a short on a power rail, the bitmap helps trace which components sit on that rail across all layers
  • Trace repair: If a PCB trace is broken (from physical damage or corrosion), the bitmap shows the exact path so you can run a jumper wire
  • Component identification: Zoom into any area of the board to see exactly which component occupies a specific location
  • BGA pad mapping: View the ball layout under BGA chips (CPU, PMU, NAND) to identify specific pin connections

Multi-Layer Advantage

Modern smartphone PCBs have 8–12 layers. A fault on layer 4 is invisible from the surface. Zhizhen's multi-layer bitmap lets you see through the board, layer by layer — something that is impossible with a standard camera photo or basic PCB image.

Schematic Diagrams — Full Circuit Blueprints

What It Does

The schematic diagram is the electronic blueprint of the device. It shows every IC (integrated circuit), every resistor, capacitor, inductor, diode, transistor, connector and their interconnections in a standardised electrical diagram format.

Circuit Sections Covered

SectionWhat It Shows
Power Management (PMU/PMIC)Battery input, charging IC, voltage regulators (LDO/Buck), power-on sequence, all supply rails
CPU / SoCProcessor connections — data buses, clock lines, GPIO, reset, boot mode pins
Display & TouchLCD/OLED driver connections, touch controller, backlight circuit
Baseband / RFModem, RF front-end, antenna switches, filters, PA (power amplifier)
WiFi / Bluetooth / GPSWireless connectivity ICs, antenna paths, crystal oscillators
AudioCodec IC, speaker amplifier, microphone bias, headphone detect
CameraMIPI CSI connections, camera power, I2C control bus
Charging / USBUSB-C/Lightning controller, fast charge IC, CC logic, data switch
StorageeMMC/UFS connections, NAND flash, RAM (LPDDR)
SIM / NFC / SensorsSIM card interface, NFC controller, accelerometer, gyroscope, proximity sensor

How Technicians Use It

  • "No power" fault: Trace the power-on sequence from battery → PMU → CPU → power button — identify where the chain breaks
  • "No service" fault: Check the RF section — antenna switch, PA, baseband connections, SIM interface
  • "No charge" fault: Follow the charging path from USB connector → charge IC → battery — find the faulty component
  • "No display" fault: Check MIPI data lines from CPU to display connector, backlight driver, display power rails

PCB Layout — Physical Component Mapping

What It Does

The PCB layout shows the physical arrangement of every component on the actual circuit board. While the schematic tells you how components are connected electrically, the PCB layout tells you where each component physically sits on the board.

How Technicians Use It

  • Locate a component: Found a faulty capacitor C4521 in the schematic? The PCB layout shows its exact location on the board
  • Orientation reference: When re-soldering a component, the PCB layout confirms correct orientation and pad alignment
  • Donor board mapping: When harvesting parts from a donor board, the PCB layout helps locate the exact component to transfer

Block Diagram — System Architecture Overview

What It Does

A simplified high-level diagram of the device's internal architecture. Shows the major functional blocks (CPU, PMU, RAM, NAND, RF, Display, Camera, etc.) and how they interconnect via buses and interfaces.

How Technicians Use It

  • Understand the device quickly: Before diving into detailed schematics, the block diagram gives a big-picture view of the entire system
  • Isolate fault areas: A "no WiFi" fault? The block diagram shows the WiFi block, its power supply, its data connection to the CPU, and the antenna path — narrowing down where to look in the full schematic
  • Training tool: Excellent for beginners learning how smartphones work at the hardware level

Diode Values — Reference Test Point Measurements

What It Does

Provides known-good diode mode readings for key test points across the board. In diode mode, your multimeter measures the voltage drop across a component — this value indicates whether the component (or the circuit connected to it) is functioning normally.

How Technicians Use It

  1. Set your multimeter to diode mode
  2. Place the red probe on the test point and the black probe on ground
  3. Compare your reading to the Zhizhen reference value
  4. If the reading matches → circuit is OK. If significantly different → fault in that area

Common Scenarios

ReadingMeaning
0.000 – 0.050VShort circuit — there is a shorted component on this line
Matches reference valueNormal — circuit is healthy
OL (Open Line)Open circuit — a component or trace is broken/missing
Higher than referencePossible high-resistance fault or missing component

Hardware Tracing Solutions — Interactive Repair Guides

What It Does

This is one of Zhizhen's most powerful features. Hardware tracing solutions are interactive visual guides that show you exactly which components and paths are involved in a specific function or common fault.

Example: "No Backlight" Repair

  1. Select the device model
  2. Choose "Backlight" from the hardware solutions categories
  3. The tool highlights the entire backlight circuit on the PCB — from the backlight driver IC to the display connector, including all capacitors, inductors, and filter components on the path
  4. Follow the highlighted path with your multimeter to find the broken point

Categories Typically Available

  • Power (no power, dead board)
  • Charging (no charge, slow charge)
  • Display (no display, no backlight, dim screen)
  • Touch (no touch, ghost touch)
  • Audio (no sound, no mic)
  • WiFi / Bluetooth
  • Baseband / Network / SIM
  • Camera (front/rear)
  • Vibration
  • Face ID / Fingerprint

Combined Bitmap + Schematic Display

A unique Zhizhen feature that overlays the schematic diagram on top of the physical board bitmap. This lets you:

  • See a component's physical location AND its electrical connections simultaneously
  • Trace a circuit path visually on the real board without switching between schematic and bitmap tabs
  • Dramatically reduces diagnosis time for complex multi-layer boards

Component Name Labels

Every component on the PCB layout is labeled with its reference designator and name. For example:

  • U3701 — WiFi/BT IC (BCM4378)
  • U1801 — Power Management IC (PMU)
  • C2915 — 0.1µF decoupling capacitor
  • L3101 — Backlight inductor

No more guessing which chip is which — every component is clearly identified.

Supported Devices (Confirmed Examples)

Latest Additions (2026)

  • Samsung Galaxy Z Flip 6 — full bitmap, schematic, PCB layout
  • Honor 300 Ultra — complete hardware repair data
  • iPhone 16 series — schematics and board views
  • Xiaomi 15 series — full coverage
  • All new 5G devices — Android 15/16 support

Laptops

  • MacBook Air / Pro (Intel & Apple M1/M2/M3/M4)
  • HP EliteBook, ProBook, Pavilion
  • Dell Latitude, Inspiron, XPS
  • Lenovo ThinkPad, IdeaPad, Legion
  • ASUS ZenBook, ROG, VivoBook
  • Acer Aspire, Predator

Getting Started

  1. Buy a licence from Code-GSM (official Zhizhen partner for Tunisia) or any authorised reseller
  2. Download v1.4.3.1 from zhizhensolutions.com/downloads
  3. Install on Windows, activate with your licence
  4. Search any device → access all schematics, bitmaps, diode values and repair solutions

Code-GSM offers Zhizhen Schematics activations at competitive prices. Browse our catalogue to get started.

How to Use Zhizhen Schematics: Step-by-Step

  1. Purchase a subscription from Code-GSM
  2. Log in to the Zhizhen platform
  3. Search for your device model (e.g., "iPhone 13 Pro", "Samsung S23") in the search bar
  4. Open the schematic view: The full circuit diagram loads with labeled components
  5. Navigate: Zoom in/out, pan across the board. Click on any component to see its specifications
  6. Use Bitmap/PCB view: Switch between schematic (circuit diagram) and PCB layout (physical component placement on the board)
  7. Trace signals: Click a signal net (e.g., VCC_MAIN, PP_GPU) → all connected components highlight
  8. Check diode values: Reference known-good diode measurements for each test point to diagnose faults

Practical Repair Tutorial: Diagnosing "No Backlight" on iPhone

  1. Open the iPhone model's schematic in Zhizhen
  2. Search for "backlight" or "LCD_BOOST" in the schematic search
  3. Find the backlight driver IC and its power supply rails
  4. Check the diode mode values for each pin against the reference values shown
  5. Measure the actual board with a multimeter in diode mode
  6. Compare: a short to ground (0.000) or open line (OL) indicates the fault location
  7. Trace from the faulty pin through the schematic to find the damaged component (capacitor, filter, IC, or trace)
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