Service Manual ViewSonic VG2427wm Model No. VSXXXXX 23.6” Color TFT LCD Display (VG2427wm_SM Rev. 1a Mar.
Copyright Copyright © 2008 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.
TABLE OF CONTENTS 1. Precautions and Safety Notices ......................................................................................... 4 2. Specification ....................................................................................................................... 7 3. Front Panel Function Control Description ....................................................................... 8 4. Circuit Description .......................................................................................
1. Precautions and Safety Notices 1. Precautions and Safety Notices 1.1 Safety Precautions This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS before installing and keep this guide handy. WARNINGS ．This monitor should be operated only at the correct power sources indicated on the label on the rear end of the monitor.
1.4 Handing and Placing Methods Correct Methods: Only touch the metal frame of the LCD panel or the front cover of the monitor. Do not touch the surface of the polarizer. Take out the monitor Incorrect Methods: Surface of the LCD panel is pressed by fingers and that may cause “Mura.” Taking out the monitor by grasping the LCD panel. That may cause “Mura.
Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects. That could scratch the surface of the panel or cause “Mura.” Place the monitor on the lap, the panel surface must The panel is placed facedown on the lap. That may be upwards. cause “Mura.
2.
3. Front Panel Function Control Description Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls”.
Do the following to adjust the display setting: 1. To display the Main Menu, press button [1]. NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu. 2. To select a control to adjust, press or to scroll up or down in the Main Menu. 3. After the desired control is selected, press button [2]. A control screen like the one shown below appears.
Main Menu Controls Adjust the menu items shown below by using the up Control and down buttons. Explanation Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video cards. If this function does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.
Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). NOTE: VESA 1920 x 1080 @ 60Hz (recommended) means that the resolution is 1920 x 1080 and the refresh rate is 60 Hertz. Manual Image Adjust displays the Manual Image Adjust menu. H./V.
Language Select allows the user to choose the language used in the menus and control screens. Resolution Notice advises the optimal resolution to use. OSD Position allows the user to move the OSD menus and control screens. OSD Timeout sets the length of time the OSD screen is displayed. For example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears. OSD Background allows the user to turn the OSD background On or Off.
4. Circuit Description 4.1 Main Board U401 NT68667UFG/C The NT68667 is a highly integrated flat panel display controller that interfaces analog, digital, and video inputs. It combines a triple ADC, a DVI compliant TMDS receiver, a digital YUV receiver, a high quality zoom and shrink engine , a multi-color on screen display (OSD) controller , an advanced color engine , and many other functions in a single chip.
Pin Assignment 14
U701 AP1117D33L and U704 AP1117E18LA: DC power convert, convert to 3.3v and 1.8v. AP1117 is a low dropout positive adjustable or fixed-mode regulator with 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply. AP1117 is also well suited for other applications such as VGA cards. AP1117 is guaranteed to have lower than 1.
Pin Descriptions Name Adj (GND) Vout I/O Pin # I 1 O 2 Function A resistor divider from this pin to the Vout pin and ground sets the output voltage. (Ground only for Fixed-Mode) The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ESR ≤20Ω) must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a large storage capacitor (0.
4.2 Power Board IC901 LD7576 The LD7576X series bring high performance, combines with highly integrated functions, protections and EMI-improve solution. It’s an ideal solution for those cost-sensitive system, reducing component count and overall system cost. The LD7576X series features near-lossless high voltage startup circuit, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation.
Block Diagram Pin Name Function This pin is to program the frequency of the low frequency timer. By connecting a capacitor to 1 CT ground to set the OLP delay time. And this pin can be used for latch mode protection. By pulling this pin lower than 0.8 V, the controller will be entered latch mode until the AC power-on recycling. Voltage feedback pin (same as the COMP pin in UC384X), By connecting a photo-coupler to 2 COMP close the control loop and achieve the regulation.
IC801 TA9687GN TA 9687 is a high performance, cost-effective CCFL (Cold Cathode Fluorescent Lamp) controller designed for driving large-size Liquid Crystal Display (LCD) applications requiring 2 to 6 CCFLs. The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage and current waveforms. The TA 9687 supports full-bridge power conversion topologies while maintaining high-efficiency operation.
Pin Description Pin No.
5. Adjustment Procedure 5.1 White balance, Luminance adjustment Approximately 2 Hours should be allowed for warm up before proceeding White-Balance adjustment. Before started adjust white balance, please setting the Chroma-C7120 MEM. Channel 0 to93000K colors, MEM. Channel 1 to 75000K colors, MEM. Channel 2 to 65000K MEM. Channel 3 to 50000K MEM.
e. Adjust sRGB (sRGB) color-temperature 1. Switch the Chroma-C7120 to RGB-mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 4 (with up or down arrow on Chroma-C7120) 3.The LCD-indicator on Minolta-CA210 will show x = 313 ±12, y = 329 ±12, Y = 80 ±15 cd/m2 10. press “1” key to save adjust value and exit . Turn the POWER-button off to on to quit from factory mode, and reset the monitor. Max Brightness measurement: >250 cd/m2 Test conditions: a.
LPT Cable VGA Cable Hardware Connect status 5.2.
Double click “Writer.
When auto detect is finished,click “Load Hex”,then chosse the firmware that you want to update Click “Auto”,then the update will begin.Wait for a moment until the bar is 100%,the program windows will show “Programing Success”.This means the update is successful.
5.3 DDC Key in Procedure Note: 1. Every time after replacing the main board, you have to do the DDC key in. 2. If you find the DDC does not conform to the LCD TV, you have to do the DDC key in. 5.3.1 Equipment Needed - VG2427wm - PC (Personal computer) - LPT cable - 12V DC - Firmware upgrade program - DDC Card 5.3.2 Install software You must install the at the first. Note: After installation, you must restart the PC to take the setup to effect. 5.3.
For analog a. Double-click b. Click ，appear as follow Figs： . c.
R3V080100001 12 codes, for example. d. Unit appears the following Fig, writer completed.
6.
7. Block Diagram 7.
7.
8. Schematic Diagrams 8.1 Main Board FB102 R102: 100 Ohm->0 Ohm R102 0R05 1/10W 5% H_Sy nc V_Sy nc VGA_B+ R103 100R 1/16W 5% DSUB_H 5 R104 DSUB_V 5 100R 1/16W 5% 5VCC R106 2K2 1/16W 5% R107 2K2 1/16W 5% C103 22pF 5V_ESD DSUB_SDA NC R101 100R 1/16W 5% 14 13 DSUB_SDA 12 5 DDC1_SDA 11 17 R113 100R 1/16W 5% ADD R145 LG 20081029 100R 1/16W 5% C102 0.047uF DSUB_B+ 5 R109 100R 1/16W 5% C106 0.047uF DSUB_B- 5 R110 470R 1/16W 5% C107 1000pF DSUB_SOG 5 R111 100R 1/16W 5% C108 0.
CN302 RXO0+ RXO1+ RXO2+ RXOC+ RXO3+ RXE0+ RXE1+ RXE2+ RXEC+ RXE3+ FB301 1 2 + C305 120 OHM +5V 5 T5M 5 T5P 5 6 7 8 R305 R306 Q301 D D D D PANEL_VCC R307 2N3904S-RTK/PS R303 22K 1/16W 5% 4K7 1/16W 5% +5V LVB0M LVB0P LVB1M LVB1P LVB2M LVB2P RXO0RXO0+ RXO1RXO1+ RXO2RXO2+ LVBCKM LVBCKP LVB3M LVB3P LVA0M LVA0P RXOCRXOC+ RXO3RXO3+ RXE0RXE0+ LVA1M LVA1P RXE1RXE1+ LVA2M LVA2P LVACKM LVACKP LVA3M LVA3P RXE2RXE2+ RXECRXEC+ RXE3RXE3+ 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
5VCC CN701 5VCC R701 NC/10K 1/16W 5% BKLT-VBRI BKLT-EN R710 R703 R707 C703 C701 C712 NC/0.1UF 16V NC/1uF/16V NC U704 AP1117E18LA 3 C710 NC/1N 50V VI VO 1 lock type PANEL_ID# 5 Volume# 5 Mute 5 GND CONN NC 0R05 1/16W 0R05 1/16W U702 NC/AIC1117A-18PE TO252 3 Vin Vout VCC1.8 2 ADJ VCC3.3 SOT223 2 4 +5V +5V +5V 4 9 8 7 6 5 4 3 2 1 C711 1K 1/16W 5% NC/0.1UF 16V BKLT-VBRI + NC/0.1UF 16V 100UF25V 1 R705 C704 C705 adj_BACKLIGHT 5 R706 100R 1/16W 5% 5VCC VCC3.3 VCC3.
DVDD FB403 300OHM VCC1.8 WP C448 1uF 16V C0603 C406 C407 C442 0.1UF 16V 0.1UF 16V 0.1UF 16V C439 1uF 16V 2 2 2 2 2 2 2 2 C447 0.1UF 16V 4 5 7 8 10 11 13 14 RX2P RX2N RX1P RX1N RX0P RX0N RXCP RXCN 41 42 2 DSUB_H 2 DSUB_V 19 20 2 DSUB_B+ 2 DSUB_B- 21 22 23 2 DSUB_SOG 2 DSUB_G+ 2 DSUB_G- 24 25 2 DSUB_R+ 2 DSUB_R- REXT RX2+ RX2RX1+ RX1RX0+ RX0RXC+ RXC- 5V_DET 3 KEY 1 3 KEY 2 C446 0.
8.2 Power Board L904 100 OHM 1/4W R918 + 100 OHM 1/4W R920 ! FB902 80OHM R904 8.2K OHM 1/4W C938 1500PF2KV NC R905 8.2K OHM 1/4W C904 ! 0.1uF C907 IC901 1 2 3 4 ! ! C940 0.
R817 4R7 1/8W +16V Q805 2 2 ZD803 RLZ5.6B +5V R816 4R7 1/8W R804 5K1 1/8W 5% 1 1 R803 5K1 1/8W 5% 4 3 2 1 R802 22R 1/8W 5% R805 NC C801 0.047uF 5 6 7 8 2 1 Q806 R818 4R7 1/8W 4 3 2 1 C811 0.1uF G1 S1 G2 S2 D1 D1 D2 D2 CN801 PT801 6 POWER X'FMR 7 5 C815 0.1uF R819 4R7 1/8W C802 0.047uF D1 D1 D2 D2 AO4620 DIM PID G1 S1 G2 S2 C819 56pF3KV 8 LV1 5 6 7 8 LV2 1 CONN 2 C818 R806 100K 1/10W 1% 1.5UF/10V R815 R808 NC 390R 1/10W 1% C812 C806 NC 2.2uF/16V C805 0.
+5V1 C609 1uF/25V Lin R604 10K 1/10W 5% C606 0.47uF/16V 100uF/25V FB602 2 9 10 11 12 13 14 15 16 CN602 LOUT+ LOUT- 4 3 2 1 ROUTROUT+ CONN C608 1uF/25V R601 10K 1/10W 5% Q607 MMBT3906 MUTE Q608 MMBT3904 BEAD C612 0.1uF/16V R610 10K 1/10W 5% C613 + IN4148 LOUTVDD LOUT+ GND GND ROUT+ VDD ROUT- R611 56K 1/10W 5% R612 10R 1/10W 5% D601 SE/BTL VOLUME LINGND GND RINBY PASS SHUTDOWN APA2069JITUL +5V1 6.2KOHM +-5% 1/10W R607 100pF C611 R606 6.
8.3 Key Board KEY 1 R001 3K 1/10W 1% UP KEY 2 R002 3K 1/10W 1% DOWN POWER Y ELLOW BLUE R003 2K OHM 1% 1/10W R004 2K OHM 1% 1/10W 1 3 5 7 9 SW01 3 4 LED001 SW 4 6 8 10 1 C002 0.1uF 16V2 2 C001 0.1uF 16V LED KEY1 POWER KEY2 DOWN UP CN001 GND GND D102 UDZSNP5.6B CABLE KEY 1 KEY 2 POWER BLUE Y ELLOW D101 UDZSNP5.6B 1 2 3 4 5 6 GND T P V ( Top Victory Electronics Co . , Ltd.
8.3 USB Board VBUS0 VBUS0 2 U702 26 Common RESET RBIAS GND_U R721 12K 1/10W 1% LOCAL_PWR/NON_REM0/SUSP_IND VDD33 11 C708 27pF 50V VDD33CR TEST 33 VDDA33 VDDA33 VDDA33 VDDA33/VDD33PLL XTAL1/CLKIN 23 GND_U C706 10nF16V 5 10 29 36 2 24.000MHz VDD18 32 C707 0.1uF/16V 1 2 3 4 GND_U t 37 VSS(FLAG) VDDA18PLL /OCS2 + 2 R732 GND_U 2 ZD706 L705 NC 2 1 DP4 3 4 R733 t 2 C716 100uF/16V R752 2 4 3 2 1 9 ZD710 GND_U GND_U 2 C727 NC/100uF/16V C728 NC/0.
9. PCB Layout Diagrams 9.
9.
9.3 Key Board 9.
10. Exploded Diagram and Exploded Parts List 10.
Item Description Part Number Q'ty 1 BEZEL A34G0935 KRB1B0130 1 2 LENS A33G0529 1 1L0100 1 3 KEY PCB KEPC8AA9 1 4 KEY PAD A33G0528 AS 1L0100 1 5 PANEL 750GLM236H1111N0VS 1 6 POWER BOARD PWPC9D41MQWU 1 7 MAIN BOARD-CBPCRNDVSQ1 756GQ8CB VV071 1 8 SPEAKERS 078G 311 20 G 1 9 MAIN FRAME A15G0489301 1 10 SHIELD-AC A85G0133101 1 11 REAR COVER A34G0936 KR 3B0100 1 12 HINGE COVER A33G0669 KR 1L0100 1 13 HINGE ASS’Y Q37G0139013 1 14 LOGO 023G3178709 3A 1 15
10.
11. Recommended Spare Parts List TDRMNDDKWBVSPC Location Part Number Description 019G6014 1 TIE FOR STRAP 023G3178709 3A LOGO 041G 68508 A CONTROL CARD 050G 600 1 W WHITE STRAP 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1185 24 VSC TAPE 052G 1186 SMALL TAPE 052G 1211 A CONDUCTIVE TAPE 55MM *45MM *0.08MM 052G 2191 A PAPER TAPE Remark 070GHDCP500HDC HDCP CODE E07801 078G 311 20 G SPEAKER 4 OHM 3 W L: 250MM 57.5X23MM E07801 078G 311 20 V SPK 4 OHM 3 W 57.
A34G0936 KR 3B0100 REAR COVER 23.6" A85G0133101 SHIELD-AC AM1G1740 12225 CR3 SCREW 040G 45762412B CBPC LABEL CN701 033G3802 9B Y W WAFER CN404 033G8019 6C CONN.6P 1.0 DIP CN302 033G8027 30 WAFER 30P 2.0MM DIP DUAL ROW CN101 088G 35315F XH D-SUB 15PIN VERTICAL CONN WITH SCREW CN102 088G 35424F XH DVI 24PIN CONN F ATTACHED SCREW X401 093G 2251B J NXS12.000AC30F-BT-2 C707 067G 2151014PB EC 100UF M 25V 6.3*11MM C704 067G 2151014PB EC 100UF M 25V 6.
R105 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R109 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R111 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R113 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R119 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R404 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R409 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R417 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R706 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R454 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R122 061G0402101 RST
R401 061G0402470 0F RST CHIPR 0402 470 OHM +-1% 1/16W R110 061G0402471 RST CHIPR 470 OHM +-5% 1/16W R303 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R138 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R137 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R136 061G0402472 RST CHIPR 4.
C302 065G0402224 17 CAP CER 0.22UF -20%-80% C401 065G0402224 17 CAP CER 0.22UF -20%-80% C102 065G0402473 12 CHIP 0.047UF 16V X7R C106 065G0402473 12 CHIP 0.047UF 16V X7R C108 065G0402473 12 CHIP 0.047UF 16V X7R C110 065G0402473 12 CHIP 0.047UF 16V X7R C111 065G0402473 12 CHIP 0.047UF 16V X7R C114 065G0402473 12 CHIP 0.
ZD401 093G 39S 34 T UDZSNP5.6B ROHM ZD402 093G 39S 34 T UDZSNP5.6B ROHM ZD403 093G 39S 34 T UDZSNP5.6B ROHM D102 093G 64 42 PP BAV70 SOT-23 D103 093G 64 42 PP BAV70 SOT-23 R148 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R149 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R151 061G0402472 RST CHIPR 4.7 KOHM +-5% 1/16W R150 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R147 061G0402101 RST CHIPR 100 OHM +-5% 1/16W C121 065G0402224 17 CAP CER 0.
CN801 033G8021 2E F WAFER IC903 056G 139 3A IC PC123Y22FZ0F IC601 056G 616 34 IC APA2069JITUL 2.6W*2 PDIP-16 NR901 061G 58809MEN RST NTCR 8OHM £«£20£¥ 4A XIANZHENG C904 063G107K224 UM X2 CAP 0.
HS1 D908 HS2 D906 HS3 0M1G 930 8120 SCREW Q90G6263 6 HEAT SINK 705GQ893039 D908 ASS'Y 093G 60278 DIODE SP1060 ITO-220 SECOS 0M1G 930 8120 SCREW Q90G6263 6 HEAT SINK 705GQ893040 D906 ASS'Y 093G 52 66 DIODE FMX-12SL 10A/200V TO-220 0M1G 930 8120 SCREW Q90G6264 5 HEAT SINK 709G2824 QM001 CONSUMPTIVE ASS'Y 055G ALCOHOL 2 055G 23524 WELDING FLUX WITHOUT PB Q55G 100625 TIN STICK_LOW ARGENTUM IC901 056G 379128 IC LD7576 GS SOP-8 IC801 056G 608 12 IC TA9687GN-A-0-TR SOP-16 Q6
R840 061G0603105 RST CHIPR 1M OHM +-5% 1/10W R841 061G0603105 RST CHIPR 1M OHM +-5% 1/10W R930 061G0603243 1F RST CHIPR 2.43K OHM +-1% 1/10W R927 061G0603360 1F RST CHIPR 3.6K OHM +-1% 1/10W R808 061G0603390 0F RST CHIPR 390 OHM +-1% 1/10W R845 061G0603512 RST CHIPR 5.1 KOHM +-5% 1/10W R844 061G0603512 RST CHIPR 5.1 KOHM +-5% 1/10W R843 061G0603512 RST CHIPR 5.1 KOHM +-5% 1/10W R842 061G0603512 RST CHIPR 5.
R935 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R920 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R919 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R918 061G1206101 RST CHIPR 100 OHM +-5% 1/4W R912 061G1206221 RST CHIPR 220 OHM +-5% 1/4W R909 061G1206339 RST CHIPR 3.3 OHM +-5% 1/4W R904 061G1206822 RST CHIPR 8.2 KOHM +-5% 1/4W R905 061G1206822 RST CHIPR 8.
C929 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R C912 065G1206102 72 CAP CHIP 1206 1000PF K 500V X7R FB902 071G 57G800 B CHIP BEAD HCB3216KF-800T30 BULLWILL D806 093G 64 42 P BAV70 SOT23 BY PAN JIT D807 093G 64 42 P BAV70 SOT23 BY PAN JIT D808 093G 64 42 P BAV70 SOT23 BY PAN JIT ZD802 093G 39S 24 T RLZ 5.6B LLDS ZD803 093G 39S 24 T RLZ 5.
Q37G0139013 VSC 23.
R718 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R719 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R720 061G0402104 RST CHIPR 100 KOHM +-5% 1/16W R724 061G0402105 RST CHIPR 1MOHM +-5% 1/16W R709 061G0402153 RST CHIP 15K 1/16W 5% R726 061G0402153 RST CHIP 15K 1/16W 5% R721 061G0603120 2F RST CHIPR 12 KOHM +-1% 1/10W R750 061G0603360 1F RST CHIPR 3.6K OHM +-1% 1/10W C706 065G0402103 12 CAP CHIP 0402 10N 16V X7R C705 065G0402104 15 MLCC 0402 0.
E08904 089G 17356X553 AUDIO CABLE Q41G2401709 3A VA2413WM SERVICE INSERT Q41G2401709 7A VG2427WM QSG FOR LI Q45G2007M0102A PE BAG FOR MANUAL Q70G2401709 3A VG2427WM CD MANUAL 040G 581 26704 SHIPPING LABEL 040G 58162435A P/N LABEL FOR MANUAL PE BAG Q40G 24N709 2A RATING LABEL Q40G 581709 1B CARTON LABEL Q40G0001709 2A SN LANEL 12.
* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows 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? Unit Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6.
