ViewSonic N3260w-1NT User manual

Service Manual
ViewSonic N3260w-1NT
N3760w-1NT
N4060w-1NT
N3260wb-1NT
N3760wb-1NT
Model No. VS10847-NT-1P
VS10848-NT-1P
VS10846-NT-1P
32” 37” 40” LCD TV
(N3260w_N3760w_N4060w_N3260wb_N3760wb-1NT_SM_Rev.1c_Nov.2006)
ViewSonic®381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

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Copyright
Copyright © 2006 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.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents
hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further,
ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents
hereof without obligation of ViewSonic to notify any person of such revision or changes.
Trademarks
Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 2006/04/25 Initial Release Sophia Kao
N3760wb-NT's RSPL and BOM.
1b2006/07/04
Add two models, N3260wb-NT and Sophia Kao
Sophia Kao
1c2006/11/14 Add Assembly and disassembly procedure
on SM.

TABLE OF CONTENTS
1. Precautions and Safety Notices 3
2.Specification 6
3. Front Panel Function Control Description8
4. Circuit Description9
5. Adjustment Procedure 16
6. TroubleShooting Flow Chart 23
7.BlockDiagram 27
8.PCB Layout Diagrams 28
9. Schematic Diagrams 32
10.Exploded Diagram and Exploded Parts List 47
11.Assembly and disassembly procedure 53
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1. Precautions and Safety Notices
All rights reserved. No part of this publication may be reproduced, transmitted, transcribed,
stored in a retrieval system or translated into any language in any form or by any means,
electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior
permission of the company.
Disclaimer
We make no representations or warranties, either expressed or implied, with respect to the
contents of this document, and specifically disclaims any warranties, merchantability or fitness
for any particular purpose. Further, reserves the right to revise this publication and make
changes in the contents without obligation to notify any person of such revision or change.
All rights reserved
VGA and XGA are registered trademarks of International Business Machines Co. Inc.
Product safety notice
Many electrical and mechanical parts in this product include specific, safety related
characteristics. These characteristics may not be immediately obvious by visual inspection and
the protection these components offer can not necessarily be obtained using replacement
components with the same voltage or power ratings.
offer can not necessarily be obtained using replacement components with the same voltage or
power ratings. Electrical components having such features are identified by shading on the
schematic diagram and in the parts list. Before replacing components, read the parts list in this
manual thoroughly.
The use of substitute parts which do not have the same safety characteristics as those indicated
in the parts list may cause electrical shock, fire, x-ray emissions, or other hazards.
Service notes
1. When replacing circuit boards or components, clamp the lead wires to the terminals before
soldering.
2. When replacing a high power resistor (oxide metal film resistor) on a circuit board, keep the
resistor at least 10 mm (0.5-inch) from the circuit board.
3. Keep leads and wires away from high voltage and high temperature components.
4. If any fuse in the product is blown, replace it only with the correct fuse specified in the parts
list.
Handling of broken glass and liquid crystal leakage
If the LCD is damaged, liquid crystal leakage may occur and the glass may shatter into small pieces. Do
not touch the broken glass or liquid crystal which is toxic. In addition to possible cuts resulting from
broken glass, toxic leakage may cause skin irritation or poisoning. If liquid crystal enters your eyes or
mouth, you should immediately rinse with clean water and consult a doctor.
Important safety information
1. Read all these instructions.
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2. Save these instructions for later use.
3. Unplug this television set from the wall outlet before cleaning.
4. Do not use accessories not recommended in the user manual as they may damage the product.
5. Do not use this product in wet locations such as near a bathtub, washbowl, kitchen sink, laundry
tub, swimming pool, or in a wet basement
6. Do not place this product on an unstable cart, stand, or table. The television receiver may fall
and causeserious injury as well as possibly damaging the product. Use only with a cart or
stand recommended serious injury as well as possibly damaging the product. Use only with a
cart or stand recommended instructions and only use a mounting kit as recommended by the
manufacturer.
7. Blocking the ventilation holes can cause overheating and fire. Take care not to block any
ventilation holes when siting the television close to walls or other objects. Never install this
product in a closed cabinet or bookcase unless sufficient ventilation is provided.
8. This television should be operated using only the type of power source indicated on the label
and in the user manual. If you are unsure what your home power supply is, you should
consult the Power Company or talk to your television dealer.
9. This television is equipped with a plug designed to fit only one way in the power socket. The
earth pin is an important safety feature of the plug. If the plug does not fit your outlets or your
outlets do not include a hole for the earth pin, you should consult a qualified electrician about
replacing the socket.
10.Do not rest anything on the power cord and do not allow the power cord to lie in a position
where it is likely to be stepped on or tripped over.
11.Follow all warnings and instructions marked on the television receiver.
12.During thunderstorms and when the television is unused for extended periods of time, you
should unplug the power cord from the outlet and disconnect the antenna.
13.External antenna systems should be sited away from overhead power lines and away from
electrical circuits. Extreme caution should be exercised when erecting an outside antenna.
Touching overhead power cables can be fatal.
14.Do not overload power outlets or extension cords as fire or electric shock can result.
15.Never push anything into the television through the ventilation slots as they may come into
contact with high voltage elements of the device and cause electric shock or fire. Take care
never to spill liquids into the product.
16.Servicing of this product should only be carried out by qualified service technicians.
17.Unplug this product from the power source and consult a qualified service technician in the
following
cases:
• The power cord is damaged or frayed.
• Liquid is spilled into the television.
• The television is exposed to rain or water.
• The television does not operate as the user manual describes. In this case, use only
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the controls covered by the operating instructions. Improper adjustment of this equipment
using controls not covered in the user manual may result in damage to the product that may
require extensive work by qualified technicians to rectify.
• The television or cabinet is damaged.
• The television shows a change in performance that indicates a need for servicing.
18. When replacement parts are used, ensure that the technician uses only parts recommended
by the manufacturer. Unauthorised replacement parts may cause a fire or electric shock.
19.After servicing, ensure that the technician performs routine safety checks to determine
whether the television is in a safe operating condition.
20.When moving this equipment, care should be taken to prevent damage due to dropping,
falling or impact.
Introduction
This service manual covers the LCD TV and is intended for the use of qualified service
engineers only. Service and repair of this product by unqualified persons may result in
permanent damage to the product or personal injury and should not be attempted.
This manual includes:
．A block diagram of the LCD TV
．An explanation of theory of operation
．An explanation of the service mode to enable you to adjust the internal settings
．A step by step guide to assembly and disassembly of the product
．A complete parts list for the product
．An exploded diagram of the product
．Pictures of the printed circuit boards
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2. Specification
Panel Type 32” (full 31.5” viewable diagonal area)
37” (full 37.02” viewable diagonal area)
40” (full 39.9” viewable diagonal area)
Active Matrix Wide-XGA, 1366x 768
Color Anti-reflective coating + Anti-glare coating
Viewing angles 32” 170° (H) / 170° (V)
37” 176° (H) / 176° (V)
40” 170° (H) / 170° (V)
Input signal Video VGA input * 1
TV system antenna
Composite Video input * 2
S-Video*2
Component Video * 2 (YCbCr, YPbPr)
HDMI*1
Audio Audio input (3.5 For VGA*1)
Audio output * 1
Compatibility PC Up to 1360 x 768 Non-interlaced
Macintosh1 Up to 832 x 624 Non-interlaced
Resolution Supported 1280 x 1024 @ 60 Hz*
1024 x 768 @ 60/75 Hz
1280 x 768 @ 60 Hz
1280 x 720 @ 60 Hz
1360 x 768 @ 60 Hz (it is the PC reference mode)
832 x 624 @ 75 Hz (Mac)
800 x 600 @ 60/75 Hz
640 x 480 @ 60/75 Hz
720 x 400 @ 70 Hz
* is not supported at HDMI status.(PIP/POP)
Speaker Output 10 W + 10 W
Power Voltage 32”:190W 110V VAC ,50/60Hz (auto switch)
37”:220W 110-240 ,50/60Hz (auto switch)
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40”:260W 110-240 ,50/60Hz (auto switch)
Operating Temperature 0°C to 40°C (32°F to 104°F)
Conditions Humidity 10% to 85% (no condensation)
Altitude To 3000 meters
Storage conditions Temperature -20°C to 60°C (-4°F to 140°F)
Humidity 10% to 85% (no condensation)
Altitude To 12,000 meters
Dimensions Physical 32” : 820 mm (W) x 650 mm (H) x 230 mm (D)
32.3” (W) x 25.6” (H) x 9.1 “(D)
37” : 960 mm (W) x 730 mm (H) x 280 mm (D)
37.8” (W) x 28.7” (H) x 11” (D)
40” : 1015 mm (W) x 755 mm (H) x 280 mm (D)
40.0 ”(W) x 29.7” (H) x 11” (D)
Package 32” : 960mm (W) x 780 mm (H) x 320 mm (D)
37.8” (W) x 30.7” (H) x 12.6 “(D)
37” :1130 mm (W) x 870 mm (H) x 370 mm (D)
44.5” (W) x 34.3” (H) x 14.6” (D)
40” : 1145 mm (W) x 910 mm (H) x 370 mm (D)
45.1 (W) x 35.8” (H) x 14.6” (D)
Weight Net 32” : 22 kg (48.5 lb.)
37” : 31 kg (68.3 lb.)
40” : 33 kg (72.7 lb.)
Gross 32” : 26.5 kg (58.4 lb.)
37” : 38.5 kg (84.9 lb.)
40” : 40.0 kg (88.1 lb.)
Regulations BSMI
Power saving modes Stand by <1.5 W (Red LED)
Preset Timing Mode (Pre-adjusted to VESA 1360 x 768 at 60 Hz)
Warning : Do not set the graphics card in you computer to exceed these refresh rates. Doing so may result in permanent
damage to the LCD.
Note : Product specifications are subject to change without notice.
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3. Front Panel Function Control Description
1. CH ▲/ ▼
Changes the channel.
2. VOL +/–
Used for changing the volume.
3. MENU
Display menu screen
4. SOURCE
Switch between display input sources.
5. POWER
Turns the TV on and off. A green light indicates that TV is on and red that it is off.
6. EARPHONE
Used for connecting headphones to the TV.
7. Power indicator LED
Green shallapplyduringalloperational states(ie.with image preaent).
Orange shall apply DPMS State for RGB/DVI.
Red shallapplywhen the product in stand-by mode. (DPMS state onlyin PC mode.)
8. SPEAKERS
Audio output.
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4. Circuit Description
Power Circuit:
Exchanged Power Model provide this machine 3 batch power: +12V, +5V and +24V. +5V is Stand-By power, provide
every circuits in main board needed power with +12V.+24 is back light power.
A. Cold-Start Mode：
zExchanged Power Model (+12V, +5V), via power1 jack transmits voltage to digital main board.
zWhen connect with AC110V, exchanged power produce +5V voltage immediately (circuit mark
5V_SB) and provide CPU U22 the needed stand-by voltage to turn on the machine
zThis machine is in Stand-By Mode now.
B. Stand-By Mode(+5V)：
zIn Stand-By Mode, Exchanged Power Model provides +5V voltage (circuit mark 5V_SB) and provides
the needed power to CPU U22 PIC 16F505.
zWhen this machine is in Stand-By mode, only U22- PIC16F505 keep working, so the system can
assure the consumption power is < 1.5W in Stand-by Mode.
zThe Block Diagram 1 shows Stand-By Mode
C. Power ON Mode(+5V ,+12V)
zWhen the system receives the start order by Power Key of the remote control or Power ON/OFF of
the control panel, it will process the following action
zThe system hands over CPU’s masterdom from CPU U22CPU to U27 M30620 .
zWhen exchanged power receives the start order by CPU U22, (signal mark POWER_ON), via Q3
MMBT3904 to control Exchanged Power Model provides +12V voltage (signal mark VCC_12V).
Every batches of digital board circuit would be able to process Power ON procedure.
zAfter every batches of digital board process Power ON procedure,U29 M30620 via BKLT_CNTL to
control circuit and light the back light.
zThe Block Diagram 2 shows the voltage of Power ON Mode and IC.
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Antenna Circuit:
• Tuner FQ1236F receivethe signal coming fromCATVor antenna RF NTSC signal and demodulate image
composite signal (signal mark TV 1) and audio medium frequency signal (signal mark SIF1).
• Image composite signal (signal mark TV 1)
• Image composite signal enter Video SW IC AV BOXU1 MM1630 PIN 17 and switch with other input
signals in U1 inner switch circute .Output from PIN 60 (signal mark CYOUT2) than via Q38 Video buffer (signal
mark CVBS_EX) and enter U38 Scaler IC EX-52 (Pin 242) directly. Switches with other input signals in
U38 inner switch circute.
• Audio medium frequency signal (signal mark TV-S), transmits U3 CAX2104S to demodulate audio IF and
stereo.Then switches signal source with other Audio Source in U4 MM1631 Audio S/W.PIN 29,30 outputs via
Q25,Q26 Audio buffer to U49 SRS TA2136F , transmits to U39 AN5891K then enter D-amplifier U17 TPA3004
output.
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AV (Video) Input circuit (AV,S,YPbPr,PC,HDMI ): (AS block diagram 4)
• AV IN:AV1、AV2、S1、S2、YPbPr1 、YPbPr2 、HDMI、PC
•AV BOX AV1 or AV2 Input:
• Composite video output signal of external AV1 or AV2 device respectively input IC U1 Video/Audio
SWITCH Input portPIN 65,71 and switch signalwith other Video Sourcein CPUcontrolled inner switch circuit.
• U1 Composite video output:
After switching with other Video Signal source, output from U1 PIN 60 (signal mark CYOUT 2) goes through Q38 Video
buffer (signal markCVBS_EX)and input U38 ScalerIC EX-52 input jack(Pin 243) (CVBS2)directly.
Switches with other input signals in U38 inner switchcircuit.
• PIP/POP mode
U3 PIN 56 output AVcomposite image signal (CYOUT1) viaBuffer Q36 translate into CVBS_7 signal then
input U30 SA7117 Video decode PIN L3 to proceed PIP/POP function in PIP/POP mode .
• S 、Composite videoTerminal.
• U3 S1 or S2 input
S video include Y,C siganl . S1Y1 & C1 input respectively U3 PIN67,69 .S2 Y2 &C2 input respectively
from U3 PIN73,75.Switch signal with other Video Source in U1 inner switch circuit.
• U3 S Output
S(Y/C) output respectively from PIN56 and 55 .Y singal via Buffer(Q29) translates into LUMA_7 than input
U30 SA7117 Video decode PIN k2.
• PIP/POP mode
Via Buffer Q36,C signal (PBOUT2) translate into CHROMA_7 and input U30 SA7117 Video decode PIN
H2 to proceed PIP/POP function in PIP/POP mode .
• HDTV:Receivesoutside AV DEVICE Component Video signal .YIN_1,PBIN_1,PRIN_1 input respectively U1
PIN21,23,25 and Switch signal with other Video Source in U1 inner switch circuit than Y via Q37 Video buffer
input U38 EX-52 PORT Y_G1(PIN246),Pb viaQ40 Video buffer input U38 EX-52 PORT PB_B1(PIN232),Pr via
Q39 Video buffer input U38EX-52 PORT PB_R1(pin225) and Switch signal with other Video Source in EX_52 .
• HDMI: Receivesoutside AV DEVICE HDMI Digital , U53 Sil9011 translate Digital Video signal decode into
24 bits Digital RGB signal DIN[0:23],than input U38 EX-52 Digital PORT DIN[0:23] and switch with other Audio
source in EX-52 .
• PC(VGA) signal includes: R、G、B、HS (Horizontal sync signal)、VS (Vertical sync signal), R transmits to U38
EX-52 PORT PR_R2_G1(PIN226)、G transmits to U38 EX-52 PORT Y_G2(PIN248)、B transmits to U38 EX-52
PORT PB_B2(PIN233) and switch with other EX-52 inner signals. HS(Horizontal sync signal) transmits to U38
EX-52 PORT AIN_HS(PIN10),VS (Vertical sync signal ) transmits to U38 EX-52 PORT AIN_VS(PIN11).
• U38 EX-52 transmits digital Video via LVDS (TXOUT0:3+,TXOUT0:3-) to PIN Set J10 and show out the image.
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AV Input Circuit(Audio):
• AV Audio input signal includes:AV(1,2)、S(1,2)、HDTV(1,2)、PC、TV、HDMI
• AV 1(S1),AV2(S2) Audio R/L Signals input respectively U4 MM1631 Audio Switch PIN35,36/PIN33,34 to
switch with other audio input source than output from U4 29,30 via Q25,Q26 Audio Buffer and input U49 SRS
TA2136F PIN1,2 to process SRS processing then output from PIN11,12.Input U39AN5891K PIN3,22 for sound
effect working .
• U39AN5891K PIN 12,13 output earphone signal and variable audio voice .Earphone signal trainsmits to U57
TDA1308T AMP to amplify earphone volum .
• HDTV (Y/Pb/Pr) left and right audio signals input repectively U4 MM1631 Audio Switch PIN1,2/3,4
• PC(VGA) left and right audio signals input to U22 MM1631 Audio Switch PIN 7,8 .
• HDMI Audio :
• Digital Audio signal :Via U53 Sil9011 Digital Vedio Decode decoded into I2s digital audio signal and via
U56 CS4334 D/A translate into analog audio signal than input U4 MM1631 Audio Switch PIN9,10.
• Analog Audio signal :input U4 MM1631 Audio Switch PIN 11,12.
• Digital /Analog Audio signal switch by OSD memu.
• After R/L audio signals switching (include AV,S,HDTV ,PC ,TV and HDMI ),All signals output from U39 AN5891
PIN12,13 and trainsmit to U17 TPA3004 amplify and output.
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CPU circuit
• U27 M30620 is 16 BITS CMOS CPU，the main CPU of the system.
• (Address Bus)：A[0:7] and A[8:18]
• Data Bus) ：AD[0:7]
• U19 W29C040 is 4Megabit(512K X 8- bit) Flash Memory，the main function is store program.
• U23 is Reset IC，reset CPU U29 at the beginning of Power ON
• CPU U27 via I2C SDA/SCL(SDA_5V /SCL_5V) to connect and control U38 SCALER IC EX52 and transmits data
via Address Bus：A[0:7] and Data Bus ：AD[0:7].
• U22 PIC16F505 is the second CPU，the main function is instead the main CPU U27 M30620 to detect Remote
controller and control On/Off button to order the system power on while this machine is in Stand-By mode. This
step can assure this machine has low consumption power as it is in Stand-By mode.
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5. Adjusting Procedure (Service mode)
An internal settings service menu is provided to allow adjustment of the device by qualified
service personal. Improper use of the internal settings service menu may render the device
unusable. Refer to the following sections to learn how to operate the service menu.
Equipment Needed
This is necessary to burning LCD TV set about 30 MIN. before start Adjusting Procedure .
Starting the service mode
To start the service mode of operation and view the internal settings menu, do the following:
1. Switch on the LCD TV and make sure that the TV mode is selected.
to enter the internal settings menu.
3. Press ▲and ▼to scroll through the various menu options.
4. Press ◄and ►to change the menu settings.
5. Press EXIT to save the new settings and exit.
6. Press DISPLAY to switch the service mode pages.
Factory Option
Firmware Update Connect to the equipment and update new software.
EEPROM clear While it displays the word “OK”, it finishes clearing.
Auto Power Up As the order shows “On”, it will turn on the power as you
connect to the power plug.
User Initialize off The suitable mode for customers.
Version Display the software version.
Factory Restore (no support)
Color Temperature Adjusts the image color intensity
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2. Press 100 991 (-/-- button followed by 991 on the number buttons) on the remote control
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Firmware Upgrade/Upgrade
1.connect Cable
Connect to the LPT1 jack
of PC
Connect to the VGA jack
of TV set
2. After connect the cable, turn on the TV set and enter Adjusting Procedure
Factory mode select [Firmware Upgrade] and press ►key to enter upgrade mode
TL3241T
3. Enter the [IAP Writer] on PC and enter the burner program.
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4. Press [open file] icon and show [open file] window picture. Select the file and
Press [OK]
5.Press [Write Device] and start writing.
The screen of TV SET when writing.
The write Device OK.
5. When writing finish, it is necessary to unplug and plug AC power. Turn on the TV
set and the upgrade OK
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