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Service Manual

ViewSonic VX2758A-2K-PRO-3

Model No. VS20058

27" Color TFT LCD Display

Document Revision: Rev. 1a, Jul. 2025

ViewSonic Corporation, 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Revision History

RevisionSM Editing DateECR NumberDescription of Changes
1a07/04/25Initial Release.

Content Index

Maintenance and Clean

General Precautions

  • Make sure the monitor is turned off and the power cable is unplugged from the power outlet.
  • Never spray or pour any liquid directly onto the screen or case.
  • Handle the monitor with care, as a darker-colored monitor, if scuffed, may show marks more clearly than a lighter-colored monitor.

Cleaning the Screen

  • Wipe the screen with a clean, soft, lint-free cloth. This removes dust and other particles.
  • If the screen is still not clean, apply a small amount of non-ammonia, non-alcohol based glass cleaner onto a clean, soft, lint-free cloth; then wipe the screen.

Cleaning the Case

  • Use a soft, dry cloth.
  • If the case is still not clean, apply a small amount of non-ammonia, non-alcohol based, mild non-abrasive detergent onto a clean, soft, lint-free cloth, then wipe the surface.

Disclaimer

  • ViewSonic® does not recommend the use of any ammonia or alcohol-based cleaners on the display screen or case. Some chemical cleaners have been reported to damage the screen and/or case of the monitor.
  • ViewSonic® will not be liable for damage resulting from use of any ammonia or alcohol-based cleaners.

Product Specifications

27"W (27" Viewable) LCD monitor

Model No: VS20058

P/N: VX2758A-2K-PRO-3

Introduction

ItemViewSonic P/NRef. P/NDescriptionOracle P/NSales Name
1Sales NameVX2758A-2K-PRO-3VX2758A-2K-PRO
2DisplayPanel P/N: CTX CT270WLEDM-B30Drive Element: IPS Technology, a-si TFT Active Matrix LCDBorder: 3-Side Borderless TypeDisplay Size: 27 real diagonal / 69 cmDisplay Area: 596.7 mm (H) x 335.7 mm (V)
Dot Pitch: 0.233 mm (H) x 0.233 mm (V)Resolution: QHD (Quad HD) 2560 X 1440Aspect Ratio: 16:9Backlight: LEDBacklight MTBF: 30000 Hrs (Min)
3OPTICAL PERFORMANCEContrast Ratio: W/B 1000:1 (typ), DCR*1 80M:1HDR: HDR10Viewing Angle: H/V; CR≥10: 178 degree / 178 degreeColor Depth: 1.07B, 10 bit (8 bit + FRC)Color Gamut: 92% of NTSC (Size), SRGB 129.57% (Size) / 99% (Coverage)
Response Time: Tr+Tf (typ) N/A, GTG(AVR) 2 ms, MPRT 1 msLuminance: 300 cd/m2
4SURFACE TREATMENTCover Glass Treatment: Anti-Glare type, Hardness 3H, Haze 25%
5INPUT SIGNALSummary: DigitalResolution (Max): 2560 x 1440Fv (Max): 240 HzNative Resolution: 2560 x 1440Fv (Max): 240 Hz
Video Sync: HDMI (v2.1), TMDS compatibleFrequency Bandwidth: Fh = 24 ~ 222 KHz; Fv = 48 ~ 144 Hz, 600 Mhz
Video Sync: DisplayPort (v1.4), PCI-EFrequency Bandwidth: Fh = 24 ~ 255 KHz; Fv = 48 ~ 240 Hz, 1080 Mhz
6CONTENT PROTECTIONHDCP 2.2
7COMPATIBILLITYDisplay: Windows 10/11 certified; macOS tested
8RESOLUTIONNative: QHD (Quad HD) 2560 X 1440Maximum: HDMI (v2.1) 2560 X 1440 @ 144 Hz, DisplayPort (v1.4) 2560 X 1440 @ 240 Hz
9MultimediaAudio: N/A
10CONNECTORSI/O: HDMI In (v 2.1) x2, DisplayPort In (v 1.4) x1, 3.5mm Audio Out x1, 3-pin Socket (IEC C14 / CEE22)Internal power supply: N/AStandard charge: N/A
11POWERVoltage: AC 100-240V (Universal); 50/60 Hz HzFrequency: 50/60 HzConsumption On Mode: Max = 30 Watt, Typ = 28 WattConsumption Modes: Max (Watt) w/ Speaker N/A, w/o Speaker 30; Standard Typ (Watt) w/ Speaker N/A, w/o Speaker 28; Optimize Typ (Watt) w/ Speaker N/A, w/o Speaker 24; Conserve Typ (Watt) w/ Speaker N/A, w/o Speaker 19; Standby Mode: 0.5 Watt (Max); Off Mode: 0.3 Watt (Max)
12ERGONOMICSTilt Range (Degrees): -5 ~ 20
13CONTROLSPhysical: Key buttons: Up, Right, Down, Left, PowerOSD: Language, Main Menu, Blue Light Filter, ECO Mode, Game Mode, View Mode
14OPERATING CONDITIONTemperature: 32°F to 104°F (0°C to 40°C)Humidity: 20% to 90% (no condensation)
15STORAGE/ SHIPPING CONDITIONTemperature: -4°F to 140°F (-20°C to 60°C)Humidity: 5% to 90% (no condensation)
16DIMENSIONSPhysical Display w/ Stand: 614.1 mm (W) x 453.35 mm (H) x 180.26 mm (D)Packing: 24.18" (W) x 17.85" (H) x 7.1" (D)Wall Mount: 614.1 mm (W) x 365.65 mm (H) x 47.05 mm (D), 24.18" (W) x 14.4" (H) x 1.85" (D)Other Dimensions: 706 mm (W) x 471 mm (H) x 128 mm (D), 27.8" (W) x 18.5" (H) x 5" (D)
17WEIGHTNet: 4.9 Kg (10.8 Lbs)Gross: 6.4 Kg (14 Lbs)
18REGULATIONSVSA: N/AVSE: CE, CE EMC, CB, RoHS, ErP, REACH, WEEE, EAC, UkrSEPROVSI: BSMI, RCM, VCCI, PSE, BISVSCN: N/A
19ENERGY EFFICIENCYEnergy Star: N/APON: N/AEEI (After 2023): FEnergy Consumption (KWh/1000h): 24, 26 w/ HDRPower Consumption Standby (less than): 0.5WPower Consumption Off (less than): 0.3WNative Resolution: 2560x1440
20RELIABILITYMTBF: 70000 Hrs (Excluding panel)
21POWER SAVING FUNCTIONOn: Blue, Normal, <= 0.5WActive Off: Amber, <= 0.3WOff: Off
22LOGISTICSVSA: Pallet Load N/A, 20' Container N/A, 40' Container N/A, 40'HQ Container N/AVSE: Pallet Load 44 pieces, 20' Container 440 pieces, 40' Container 924 pieces, 40'HQ Container N/AVSI: Pallet Load 44 pieces, 20' Container 440 pieces, 40' Container 924 pieces, 40'HQ Container N/AVSCN: Pallet Load N/A, 20' Container N/A, 40' Container N/A, 40'HQ Container N/AVSJP: Pallet Load N/A, 20' Container N/A, 40' Container N/A, 40'HQ Container N/A
23ID CodeUPC Code: 76690702789 1EAN Code (WW): 076690702789 1EAN Code (China): N/AJAN Code: 4589468732556GLN Code: 0766907060102S/N Prefix: XQYEDID PID Code: 4160
24COUNTRY OF ORIGIONCHINA
25WALL MOUNTVESA Compatible, 100 x 100
26Eye ProTechLevel, Flicker Free, Low Blue Light, Eye ProTech Yes, Software solution
27CABINET COLORBlack
28OTHERSFreeSync for HDMI, FreeSync Premium for DP, MPRT 1ms, Security Slot, DDC/2B, DDC/CI, Detachable Base
29PACKAGE CONTENTSVX2758A-2K-PRO-3 LCD Display x1, 3-pin Plug (IEC C13 / CEE22) Power Cable -- 1.8m x1, DisplayPort Cable (v1.4; Male-Male) -- 1.5m x1, Quick Start Guide x1

OSD Settings and Shortcut Keys

Main MenuSub-menuMenu Option
Input SelectHDMI 1
HDMI 2
DisplayPort
Audio AdjustVolume(-/+, 0~100)
MuteOn
ViewModeStandard
FPS Game
RTS Game
MOBA Game
Movie
Web
Text
MAC
Mono
Color AdjustContrast/BrightnessContrast: (-/+, 0~100)
Brightness: (-/+, 0~100)
6-axis ColorHue: Red (-/+, 0~100), Green (-/+, 0~100), Blue (-/+, 0~100), Cyan (-/+, 0~100), Magenta (-/+, 0~100), Yellow (-/+, 0~100)
Color Saturation: Red (-/+, 0~100), Green (-/+, 0~100), Blue (-/+, 0~100), Cyan (-/+, 0~100), Magenta (-/+, 0~100), Yellow (-/+, 0~100)
Color TemperatureBluish, Cool, Native, Warm, User Color: Red (-/+, 0~100), Green (-/+, 0~100), Blue (-/+, 0~100)
Color ModesRGB, Adobe RGB, DCI-P3, Native
Color SpaceAuto, RGB, YUV
Color RangeAuto, Full Range, Limited Range
HDR10Auto, Off
Manual Image AdjustSharpness(-/+, 0/25/50/75/100)
Blue Light Filter(-/+, 0~100)
Aspect Ratio4:3, 5:4, 16:9, 16:10
OverscanOn/Off
Black Stabilization(-/+, 0/10/20/30/40/50/60/70/80/90/100)
Advanced DCR(-/+, 0/25/50/75/100)
Response TimeStandard, Advanced, Ultra Fast
Setup MenuLanguage SelectEnglish, Français, Deutsch, Español, Italiano, Suomi, Svenska, Русский, Türkçe, Česká, Tiếng Việt, 日本語, 한국어, 繁體中文, 简体中文
AMD FreeSyncOn/Off
1ms ModeOn/Off
Resolution NoticeOn/Off
Information
OSD Timeout(-/+, 5/15/30/60)
OSD BackgroundOn/Off
Power IndicatorOn/Off
Auto Power OffOn/Off
Sleep30 minutes, 45 minutes, 60 minutes, 120 minutes
ECO ModeOff, Standard, Optimize, Conserve
DisplayPort 1.1On/Off
Auto DetectOn/Off
DDC/CIOn/Off
Memory Recall

Tool & Equipment

Hardware Tools

  • 1.1 Cross screwdriver: A Phillips head screwdriver with a red handle.
  • 1.2 FW tool: A circuit board with various components and connectors, labeled "KDL68W-01 REV0.1 2019.01.05".
  • 1.3 USB 2.0 cable: A black USB 2.0 cable with Type-A connectors on both ends, coiled.
  • 1.4 HDMI cable: A black HDMI cable with gold-plated connectors.
  • 1.5 Guide knife: A utility knife with a white handle and a blade.

Software Tools

  • 2.1 RTD tool V1.2
  • 2.2 Sm_setup25.exe

Equipment

  • 3.1 True RMS multimeter: A Fluke 175 True RMS Multimeter.
  • 3.2 Video pattern generator: A unit labeled "Video Pattern Generator 2238".
  • 3.3 Oscilloscope: A digital oscilloscope displaying waveforms.

Disassembly Procedure

1. Clean the work area.

2. Identify the area for material.

3. Prepare the implements, equipments, and materials as follows:

  • Press-fixture
  • Working table
  • Screw-driver
  • Knife*1
  • Glove
  • Cleaning cloth
  • ESD protection
NO.Picture DescriptionOperationTool
1Back of monitor with numbered points indicating screw locations and disassembly areas.Disassemble back shell --- 1 screw and 1 knifeScrew-driver, knife*1
2Wires being disconnected.Remove the wires
3More wires and a circuit board visible.Remove the wires
4Circuit board with numbered components and screw locations.Remove the key pad --- 3 screwScrew-driver
5Circuit boards.Remove the motherboard, power board --- 8 screwsScrew-driver
7Power board assembly.Remove motherboard, power board bento box. --- 8 screwScrew-driver
8Power supply unit with wires.Remove the wires
9Circuit board with labeled wires: "屏线" (screen cable), "主板供电线" (mainboard power cable), "按键线" (keypad cable), "导电泡棉" (conductive foam).Remove the wires
10Adapter strip with screw locations.Remove the Adapter strip --- 6 screwScrew-driver
11Front frame with screw locations.Remove the front frame --- 9 screwScrew-driver

Electronic Circuit Block Diagram

The VX2758A-2K-PRO-3 consists of a main body and a stand (base). The main body contains an QUNCHUANG TFT LCD module with LED Backlight, a Power board, a control board, a LED board, and an interface board. The block diagram illustrates the connections between these components.

Diagram Description:

  • DP signal connects to Scaler IC MT9800.
  • HDMI signal connects to Scaler IC MT9800.
  • Keypad control connects to Function order.
  • Scaler IC MT9800 (supports DP and HDMI signal) outputs Lvds differential signal to Panel PCB.
  • Scaler IC MT9800 also connects to Flash and E2ROM.
  • +3.3V and +5V power rails are present.
  • Interface board control connects to Power board.
  • Power board provides 12V LED Driver.
  • 12V LED Driver powers the Black light.
  • AC+ power input is shown.

PCB Layout Diagrams

1. Main Board - Top

Diagram showing the top side of the main circuit board with component placement and dimensions indicated (e.g., 102.00mm, 96.00mm, 62.50mm, 21.00mm, 9.00mm, 13.30mm, 34.00mm, 60.00mm, 87.00mm, 111.00mm, 125.00mm, 132.00mm, 137.00mm). Key areas and connectors like POWER-IN, BACKLIGHT, DC-IN, JP2, U1438, JC2, HL6, EPT, LIGHTING EFFECTS, CP13, BS3, CS40, UP6, CHA2, EP4, HH, CP2, BS14, CS78, TP3, RHB3, CHB3, LP7, BCD3, CD4, RD4, RFA16, R1150, LP3, R1136, PANEL, CA18, EA2, BA5, RT81, CT53, CT45, RA12, UT8, CP83, RP30, RP29, RA28, RA21, 601, RT75, RT76, SPEAKER, CA14, CA15, CA13, CA12, CAS, 2A3, RA29, CT79, CT119, CA2, CA, RT73, UT12, LT34, RUZ, DUB, HL2, JA1 are visible.

1. Main Board - Bottom

Diagram showing the bottom side of the main circuit board with component placement and dimensions indicated. Similar dimensions as the top side are shown. Features like "ROHS", "PASS", "SN" are visible.

2. Power Board

Diagram showing the layout of the power board with various components, connectors, and traces.

Power Board Component Details

NoNameP/NPosition numberSpecificationRemarks
1capacitor(1) GT1E681M101 6VTC1325V/680uFOver 400uF
2capacitor(2) EGT687M1EG1 6RR**PC725V/680uFOver 400uF

Firmware & EDID Programming SOP

Please visit the website below for software or firmware updates and service support.

Website: https://www.viewsonic.com/global/support/warranty/

Troubleshooting Guide

This section describes some common problems that you may experience when using the monitor.

Problem or IssuePossible Solutions
No power
  • Make sure you have turned on the monitor by pressing the Power button.
  • Make sure the power cord is properly and securely connected to the monitor and power outlet.
  • Plug another electrical device into the power outlet to verify that the outlet is supplying power.
Power is On, but no image appears on screen
  • Make sure the video cable connecting the monitor to the computer is properly and securely connected.
  • Adjust the brightness and contrast settings.
  • Make sure the correct input source is selected.
Wrong or abnormal colors
  • If any colors (red, green, or blue) are missing, check the video cable to make sure it is properly and securely connected. Loose or broken pins in the cable connector could cause an improper connection.
  • Connect the monitor to another computer.
Screen image is too light or dark
  • Adjust brightness and contrast settings via the OSD Menu.
  • Reset the monitor to factory settings.
  • Make sure the correct input source is selected.
Screen image cuts in and out
  • Check for bent or broken pins in the video cable connector.
  • Make sure the video cable connecting the monitor to the computer is properly and securely connected.
Screen image is blurred
  • Adjust the resolution to the correct Aspect Ratio.
  • Reset the monitor to factory settings.
The screen isn't centered correctly
  • Adjust the horizontal and vertical controls via the OSD Menu.
  • Check the Aspect Ratio.
  • Reset the monitor to factory settings.
The screen appears yellow
  • Make sure the “Blue Light Filter" is Off.
The OSD Menu does not appear on the screen/the OSD controls are inaccessible
  • Check whether the OSD Menu is locked.
  • Turn off the monitor, unplug the power cord, plug it back in, and then turn on the monitor.
  • Reset the monitor to factory settings.
Control panel keys do not work
  • Press only one key at a time.
  • Restart the computer.
Some menus aren't selectable in the OSD
  • Adjust the ViewMode or the input source.
  • Reset the monitor to factory settings.
No audio output
  • If using ear-/headphones, ensure the mini stereo jack is connected.
  • Make sure the volume is not muted, nor set to 0.
  • Check the Audio Input setting.
The monitor will not adjust
  • Make sure there are no obstructions near or on the monitor, and that there is adequate spacing.
  • For more information, see "Adjusting the Viewing Angle".
USB devices connected to the monitor do not work
  • Make sure the USB cable is connected properly.
  • Try changing to another USB port (if applicable).
  • Some USB devices require a higher electric current; connect the device directly to the computer.
The external device is connected, but no image appears on the screen
  • Make sure the Power is On
  • Adjust brightness and contrast via the OSD Menu.
  • Check the connecting cable and make sure it is properly and securely connected. Loose or broken pins in the cable connector could cause an improper connection.

Exploded Diagram

Diagram showing the internal components of the monitor disassembled, with numbered labels pointing to each part.

Exploded Parts List

ViewSonic Model Number: VS20058

ItemViewSonic P/NRef. P/NDescriptionQ'ty
1B-00017419X01KDL68WMPDRP/B KDL68W-01 12V2.5A 45V/600mA R75 1KΩ MPRT EMI对策修改 KD REACH1
2B-00016727S02GGK2700BBRGK27 Led Board Rev: 2.1 40*12*1mm Blue/Orang BS REACH1
3B-00016530S01GGK2700B1RGK27 rocker Board REV: 2.0 修改PCB结构Layout BS REACH1
4B-00017418S03JRM9800CARHA1 MT9800RTPTNG 12V DC+DP+HDMI*2 L/Out 60Pin 10V 8eDP HD RJRY REACH1
5HW-00012650C08GE270YG00R转接铁板 L4款,转接铁板(延伸款),SGCC T1.5, REACH1
6HW-00012579C06GK270SCVOR转轴 GK27 V2 转轴,本色,SGCC T2.0, REACH1
7C-00015980C04V2000DH00RV2压铸支架 V2压铸支架,德辉(结构改善)暗夜黑(喷涂),PE袋,REACH1
8C-00015981B06A2000DH00RA2底座组立 A2底座组立,德辉;压铸件(结构改善)(三角形)+脚垫+M6手拧螺丝, 暗夜黑(喷涂),PE袋,REACH1
9HW-00012504C07NI315CXZ2R电源板便当盒 NI31.5电源板便当盒带喇叭挂耳 端口加宽 REACH1
10HW-00012578C07ND001TDZTR主板便当盒 GK27主板便当盒,2H1DP1Audio out, REACH1
11PL-00009748B08NI315KBZORNI315-K导光柱 NI315-K导光柱,PC,透明高亮,REACH1
12PL-00009747B07GK270XX00R按键 GK27按键,ABS黑色,MT11015, REACH1
13M-00010495Z090100VSC01RlogoViewsonic logo 彩色铭牌(H=9.98mm;T0.6)REACH1
14C-00015650B02GK270PD01R前框 GK27前框 - A款,黑色ABS, MT11015, REACH1
15C-00015979B03GE270XXA0R后壳 GE27后壳-A款(结构改良),黑色ABS,MT11020+拉丝纹,REACH1
16E-00015049T01270F2BE06R27寸液晶屏 27"PANEL BOE (ME270QHB-NF1) 2560×1440 300cd/m² 240Hz REACH1

Reader's Response

Thank you in advance for your feedback on our Service Manual which allows for continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below for return to ViewSonic Corporation.

Assessment

A. What do you think about the content of this Service Manual?

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Maintenance and Clean
Product Specifications
OSD Settings and Shortcut Keys
Tool & Equipment
Disassembly Procedure
Electronic Circuit Block Diagram
PCB Layout Diagrams
Firmware & EDID Programming SOP
Troubleshooting Guide
Exploded Diagram

B. Are you satisfied with this Service Manual?

ItemExcellentGoodFairBad
Service Manual Content
Service Manual Layout
The format and listing

C. Do you have any other opinions or suggestions regarding this service manual?

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After completing this form, please return it to ViewSonic Quality Assurance in the Taiwan at facsimile 886-2-8242-3660.

Models: VX2758A-2K-PRO-3, VS20058, VS20058 27 Inch Color TFT LCD Display, VS20058, 27 Inch Color TFT LCD Display, Color TFT LCD Display, TFT LCD Display, LCD Display

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VX2758A-2K-PRO-3 USER SM

References

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