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SERVICE MANUAL
COLOR MONITOR
MODELS: V552 (A)
NEC DISPLAY SOLUTIONS, LTD.
Multi Sync V552&V652
V552 (B)
V552 (C)
LCD-V552 (J)
V652 (A)
V652 (B)
V652 (C)
LCD-V652 (J)
2nd Edition
PART NO. 599911029
V552-U2 (A)
V552-U2 (B)
V552-U2 (C)
LCD-V552-U2 (J)
201512
08V71UAN 08V71UBN 08V94UAN
08V71UCN 08V71UJN 08V94UBN
08V91UAN 08V91UBN 08V94UCN
08V91UCN 08V91UJN 08V94UJN
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Table of Contents
Related Manuals for NEC LCD-V652 J
Summarization of Contents
Safety Guidelines in Servicing
Other Necessary Cautions
Additional servicing precautions, including cable handling and screw usage.
Caution for Lead-Free Soldering Work
Solder Iron Tip Temperature and Contact Time
Table detailing recommended tip temperatures and contact times for soldering parts.
Troubleshooting Monitor Issues
Troubleshooting: Diagnosis Flowchart
Diagnostic flowchart for detecting failures based on LED indicators and symptoms.
Troubleshooting: No Power Issues
Flowchart for diagnosing and resolving no power issues in the monitor.
Troubleshooting: No Video (Orange LED)
Flowchart for diagnosing no video issues indicated by an orange LED.
Troubleshooting: No Video (Green LED)
Flowchart for diagnosing no video issues indicated by a green LED.
Troubleshooting: Image Defects
Flowchart for diagnosing image overlap, focus, or flicker issues.
Troubleshooting: Brightness Defects
Flowchart for diagnosing and resolving brightness issues in the monitor.
Troubleshooting: Color Defects
Flowchart for diagnosing color defects and white balance issues.
Troubleshooting: Line/Block Defects
Flowchart for diagnosing line and block defects on the screen.
Troubleshooting: Color/Brightness Unevenness
Flowchart for diagnosing partially color or brightness uneven issues.
Troubleshooting: Dot Defects
Flowchart for diagnosing bright or dark dot defects on the LCD panel.
Troubleshooting: Audible Defects
Flowchart for diagnosing sound issues like no sound or noise.
Disassembly Procedures
V552 Disassembly Guide
Visual guide and steps for disassembling the V552 model.
V652 Disassembly Guide
Visual guide and steps for disassembling the V652 model.
Adjustment Procedures
Adjustment: Required Tools and Instruments
List of required instruments and tools for unit adjustment.
Adjustment: Power Supply Requirements
Specifies the input power voltage requirements for adjustment.
Adjustment: Power Circuit Closure Steps
Steps for closing the power circuit for adjustment procedures.
Adjustment: ADC Bias and Gain
Procedure for adjusting Analog-to-Digital Converter bias and gain.
Adjustment: Color Temperature Check
Procedure for checking RGB data for color temperature adjustment.
Basic Operation Guide
Explanation of basic monitor operations and button functions.
Special Key Operations
Details on special key operations, including factory mode access.
Inspection Procedures
Inspection: Electric Performance
Checks for OSD control switch and electrical performance of the monitor.
Inspection: Recommended Frequency Check
Verifies the reception and display of the recommended frequency signal.
Inspection: Performance Check
Checks color bars and grayscale patterns for smooth display and data accuracy.
Inspection: Audio Functionality
Confirms proper operation of the audio output function.
Inspection: LCD Module External
Guidelines for external inspection of the LCD module, including defects.
EDID/OSD Data Writing Procedures
EDID Writing SOP (VGA Port)
Standard operating procedure for writing EDID data using a VGA port.
EDID/OSD Writing Troubleshooting
Steps to resolve common issues encountered during EDID/OSD writing.
EDID Writing SOP (HDMI Port)
Standard operating procedure for writing EDID data using an HDMI port.
Shipment Settings Configuration
Shipment Settings: OSD Controls
Table listing OSD control items and their corresponding shipment settings.
Packing Specifications
V552 Packing Details
Explains the packing materials and method for the V552 model.
V652 Packing Details
Explains the packing materials and method for the V652 model.
Revision History
Revision History: 1st Edition Release (2012/12)
Records the initial release of the service manual in its first edition.
Revision History: 1st Edition Update (2013/02)
Details the addition of new models to the first edition in February 2013.
Revision History: 2nd Edition Update (2015/12)
Documents the update for new models in the second edition in December 2015.
Recommended Spare Parts List
Spare Parts: V552 (A) - USA
Lists recommended spare parts for the V552 (A) model for the USA market.
Spare Parts: V652 (A) - USA
Lists recommended spare parts for the V652 (A) model for the USA market.
Spare Parts: V552-U2 (A) - USA
Lists recommended spare parts for the V552-U2 (A) model for the USA market.
Spare Parts: LCD-V552-U2 (J) - Japan
Lists recommended spare parts for the LCD-V552-U2 (J) model for the Japanese market.
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