BenQ V37X User manual

1
Applicable Country & Regions:
Europe
Product Service Manual – Level 1
Service Manual for BenQ:
LCD TV / V37X
<9J.01B75.BAE >
Version: 001
Date:20-10-2006
Notice:
For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and liability
statements.
Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the most
recent version of this manual.
First Edition (August, 2006)
© Copyright BenQ Corporation 2006. All Right Reserved.

2
Content Index
ABBREVIATIONS & ACRONYMS.................................................................................................................................3
ABOUT THIS MANUAL...................................................................................................................................................4
INTRODUCTION ..............................................................................................................................................................5
RELATED SERVICE INFORMATION ..........................................................................................................................7
PRODUCT OVERVIEW...................................................................................................................................................8
SPECIFICATIONS ....................................................................................................................................................................9
PACKING .............................................................................................................................................................................59
CUSTOMER ACCEPTANCE....................................................................................................................................................61
DISASSEMBLY/ASSEMBLY .........................................................................................................................................80
EXPLODED VIEW ................................................................................................................................................................80
DISASSEMBLY /ASSEMBLY .................................................................................................................................................81
LEVEL 1 COSMETIC / APPEARANCE /ALIGNMENT SERVICE.......................................................................104
VISUAL INSPECTION &CLEANING ....................................................................................................................................104
ADJUSTMENT /ALIGNMENT PROCEDURE ..........................................................................................................................105
LEVEL 2 CIRCUIT BOARD AND STANDARD PARTS REPLACEMENT...........................................................114
BLOCK DIAGRAM .............................................................................................................................................................114
TROUBLESHOOTING ..........................................................................................................................................................116
LEVEL 3 - COMPONENT REPAIR TO CURCUIT BOARDS.................................................................................119
THEORY OF CIRCUIT OPERATION ......................................................................................................................................119
CIRCUIT SCHEMATICS .......................................................................................................................................................126
PCB ARTWORK .................................................................................................................................................................143
APPENDIX 1 – SCREW LIST /TORQUE...................................................................................................................153
APPENDIX 2 – CODE LIST: IR/RS232.......................................................................................................................154

3
Abbreviations & Acronyms
A
A/D Converter Analog to Digital Converter
B
BenQ BenQ Corporation
C
D
DTV Digital Television
E
EMI Electromagnetic Interference
F
G
H
HDMI High Definition Multimedia Interface
I
J
K
L
M
N
NTSC National Television System Committee
O
OSD On Screen Display
P
PAL Phase Alternating Line
Q
R
RS232 Interface Between Data Terminal Equipment and Data
Communications Equipment Employing Serial Binary Data
Interchange
S
T
U
V

4
About This Manual
This manual contains information about maintenance and service of BenQ products. Use this manual
to perform diagnostics tests, troubleshoot problems, and align the BenQ product.
Important
Only trained service personnel who are familiar with this BenQ Product shall
perform service or maintenance to it. Before performing any maintenance or service,
the engineer MUST read the “Important Safety Information”.
Trademark
The following terms are trademarks of BenQ Corporation:
BenQ
Other companies, products, or service names may be the trademarks of their respective companies.

5
Introduction
This section contains general service information, please read through carefully. It should be stored
for easy access place.
Important Service Information
RoHS (2002/95/EC) Requirements –Applied to all countries require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is
a legal requirement by EU (European Union) for the global electronics industry which sold in EU
and some counties also require this requirement. Any electrical and electronics products launched
in the market after June 2006 should meet this RoHS requirements. Products launched in the
market before June 2006 are not required to compliant with RoHS parts. If the original parts are
not RoHS complaints, the replacement parts can be non ROHS complaints, but if the original parts
are RoHS compliant, the replacement parts MUST be RoHS complaints. If the product service or
maintenance require replacing any parts, please confirming the RoHS requirement before replace
them.
Safety Notice
1. Make sure your working environment is dry and clean, and meets all government safety
requirements.
2. Ensure that other persons are safe while you are servicing the product.
3. DO NOT perform any action that may cause a hazard to the customer or make the product
unsafe.
4. Use proper safety devices to ensure your personal safety.
5. Always use approved tools and test equipment for servicing.
6. Never assume the product’s power is disconnected from the mains power supply. Check that it
is disconnected before opening the product’s cabinet.
7. Modules containing electrical components are sensitive to electrostatic discharge (ESD). Follow
ESD safety procedures while handling these parts.
8. Some products contain more than one battery. Do not disassemble any battery, or expose it to
high temperatures such as throwing into fire, or it may explode.
9. Refer to government requirements for battery recycling or disposal.

6
Compliance Statement
1. Caution: This Optical Storage Product contains a Laser device. Refer to the product
specifications and your local Laser Safety Compliance Requirements.

7
General Descriptions
This Service Manual contains general information. There are 3 levels of service:
Level 1: Cosmetic / Appearance / Alignment Service
Level 2: Circuit Board or Standard Parts Replacement
Level 3: Component Repair to Circuit Boards
Related Service Information
BenQ Global Service Website:http://support.benq.com/front/benqmain.asp
eSupport Website:http://bqpgsr.benq.corp.com/customize/asplogin.asp

8
Product Overview
This specification describes a 37" diagonal LCD TV with aspect ratio of 16:9 which supports up to 1366*768 WXGA
format and can display true 16.7M colors ( 8-bit/color) . This LCD TV is very thin and completely free from
electromagnetic distortion. So you can install it just about any place. You can simply place it on a table, hang it on the
wall. LCD TV reproduces images by adjusting the brightness, color and contrast of each individual pixel on the screen.
It has the following features:
1.Panel :
- Center luminance 500nits (TPY)
- Contrast ratio approximates 800:1 (TPY)
- Viewing angle ( Horizontal and vertical) great than 170° (CR≥10)
- Resolution : 1366x768, 16:9
2.PC :
- PC timing could support 1080p.
- High quality scaling function
- Power saving mode support (PC mode)
- PC Audio input
-
3.Video/TV :
- HDMI 1.1 / DVI 1.0
- HDTV function compatible (480i/480p/1080i/720p/1080p)
-Built-in De-Interlace, Noise Reduction , 2:2 pull down (PAL)function
-Tuner : pan-European(PAL B/G, PAL D/K, PAL I, SECAM L, SECAM L').
-CVBS, AV Audio, S-Video, Component. CVBS/S-Video auto detection support.
-Scart1 Video (RGB/CVBS input/ CVBS output / Audio input/ Audio output)
-Scart2 Video (CVBS input/ S-video input/ CVBS output/ Audio input/ Audio output)
-Information : Teletext 1.5 (100pages,TOP&FLOF)
-Sound : Stereo Nicam
3.Audio :
- Built-in 10Wx2 speakers.
- Virtual Dolby Surround Pro Logic II
- Earphone output
- Audio monitor output
4 power :
- 90Vac ~ 264Vac universal power
5.user interface :
- User controls: on/off switch, key pad with input select, menu, channel up, channel down, left( - ), right ( + ),
- IR remote controller
- Fancy OSD (on screen display) for user control interface
- Color indicator for power on/standby

9
It is composed of the following material and accessories (Accessory might be adjusted by different territory request):
-LCD TV *1
-User Manual + warranty card
-A power cord
-Remote control x 1 & AAA batteries x 2
Specifications
2.1 Environment
2.1.1 Temperature
-Operating +0 to +40 degrees Celsius
-Non-operating -20 to +60 degrees Celsius
2.1.2 Humidity
-Operating 20% to 90% non-condensing
Criteria inspection :
The products should be operated and performance normally at specified temperature
environment.
Test condition: (-20°C~60°C/10%~90% R.H.)
1. Storage hight temp./humidity exposure test
25°C 90%/24hrs→ 60°C,70%/96hrs→25°C
60%/1hrs
2. Storage transportation test.
25°C 60%/ 1hrs → -20°C /24hrs→25°C 60%/1hrs
→60°C, 70%/24 hrs → 25°C 60%/1 hrs
Note.These tests can be combine with Item 1,2 most worse Temp./Hum. and test time.
3. The Stack test ambient can be combined with storage
test with dummy load x1.
Criteria Inspection:
1.The products should be operated normally at
specified lower and higher temperature environment.
2.The carton no crash and broken issue.
Step Temperature
℃Humidity Duration
125 90% 2H
240 90% 6H
30 Free6H
4 40 10% 6H
525 90% 2H
Duration : repeat 2 cycles
TestCondition: 0-40 ℃/10%-90%
Non- condensation.

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2.2 Transportation

11

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2.3 Packaging Configuration
2.3.1 Container Specification
40’ container dimension: 11900*2280*2080(L*W*H)(in size)
20’ container dimension: 5840*2280*2080(L*W*H)(in size)
2.3.2 Product characteristics
Net Weight (Kg) Gross Weight (Kg) Dimension w/o Base
W*H*D (mm)
Dimension w/ Base
W*H*D (mm)
27.0 32.0 969.84*696.70*110.00 969.84*745.86*110.00
2.3.3 Package dimension
Carton Interior Dimension (mm)
W*H*D
Carton External Dimension (mm)
W*H*D
1114.00*850.00*380.00 1130.00*875.00*396.00
2.3.4 Pallet Specification
Pallet size: 1130*1190*120mm
2.3.4 Container carry capacity
40’ 120 SETS;
20’ 56 SETS

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2.4 Electrostatic Discharge Requirements
The subject product must withstand 8KV for contact and 15KV for air discharge of electrostatic
discharge and meet the acceptance criteria as specified in BenQ ESD specification.
BenQ's LCD TV Product of Reliability Design Guide Date : 25-04-2006
Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
16 ESD Test Test condition :
1. Air discharge to set surface is 15KV.
2. Contact discharge to set surface and
matel is 8KV.
3. Contact discharge to Vert./Horiztl
coupling plane is
8KV.
4. Contact discharge 4KV to
D-sub/S-video input pins
Criteria inspection :
Above test items no abnormity appear.
Test condition :
1. The products should meet the Engineering
Spec. (Refer to IE C801-2 & IEC61000-4-2)
2. Test timing : Prime mode ( Max. resolution
and refresh rate)
3. Test Pattern: Reversed cross hatch pattern
4. Air discharge at insulating surfaces
5. Contact discharge to the conductive surfaces
and to coupling planes.
6. Coupling effect
Criteria inspection :
Above test items no abnormity appear.
ESD Voltage Level (KV)
Air Contact Air Contact Air Contact
2~4 2~4 >4~8 >4~6 >8~15 >6~8
ESD Voltage Discharge Level (KV)
Acceptance Air Contact Air Contact Air Contact
Criteria 2-4 2-4 8 6 15 8
No any error Permit Permit Permit
Self recoverable Not Permit Permit Permit
System rest Not Permit Not Permit Permit
Damage Not Permit Not Permit Not Permit

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2.5 Safety and EMC Requirements
Safety
Agencies
3TUV GS
3C-Tick
3Other CB report
EMC
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
17 EMI Test Test condition :
FCC part 15J class B, EN55022 class B.
Above test items must be measure constant.
Criteria inspection :
1. Under 4 dBuv for C3 stage.
2. Under 3 dBuv for C4 stage.
3. Under 3 dBuv for C5 stage.
4. After Mass production under 1 dBuv.
Besides DNSF and VCCI class-2 are
optional.
Test condition:
FCC subpart 15B, EN55022 class
B.
Above test items must be measure
constant.
Criteria inspection:
1. Under 4 dBuv for
C3 stage.
2. Under 3 dBuv for
C4 stage.
3. Under 3 dBuv for
C5 stage.
4. After Mass
production under
1 dBuv.
Besides DNSF and VCCI class-2
5 4 3 2
Agencies
3CE Class B
3C-Tick

15
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
are optional.
19 CE Marks Test condition:
1. PLT
2. Voltage Dip: According to EN61000-4-11
3. Current Harmonic: According to EN
61000-3-2
4. Voltage Fluctuation: According to
EN61000-3-3
5. RS Test: According to EN61000-4-3
6. EFT Test (EN55024:1998)
Directive 73/23/EEC;
Directive 89/336/EEC
1. Power Harmonic Test
(EN 61000-3-2 class D)
2. Power Fluctuation Test
(EN61000-3-3)
3. EFT Test (IEC
61000-4-4)
4. Surge Test (IEC
61000-4-5)
5. Power Frequency
Magnetic Field Test
(IEC 61000-4-8)
Voltage Dips and Interruption
Test (IEC 61000-4-11)
2 0 2 1
2.6 Acoustical Noise
With the display operating, the issue of sound is contained within 25 dB/A in the front about 1m at 25℃
and it should be tested with 360 degree
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
13 Acoustic
Noise Test
Test condition :
Mode : Seated operator ( ISO7779)
1. Microphone position height at center of
panel.
2. The Microphone angle of sound incidence
is 0°.
3. Test DUT and microphone between
measure distance is 30 cm.
Test condition :
Mode : Seated operator ( ISO7779)
1. Microphone position height at
center of panel.
2. The Microphone angle of sound
incidence is 0°.
3. Test DUT and microphone
between measure distance is 100
2 0 2 2

16
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
4. To measure the front side noise of the
UUT, with the display is operating, fan is /
is not operating.
5. Test table height is 75cm.
Background noise< 20 dBA
Criteria inspection :
Fan operating : ≦35dBA.
Fan non- operating : ≦25dBA.
cm.
4. To measure the around noise of
the UUT(four direct), with the
display is operating, fan is / is
not operating.
5. Test table height is 75cm.
Background noise< 20 dBA
Criteria inspection :
Fan operating : ≦35dBA.
Fan non- operating : ≦25dBA.
2.7 Reliability
1. MTBF would be 50,000 hours. (exclude LCD module, Power Supply ).
2. Panel life time: 60,000hours. (follow panel manufacturing spec).
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
1 Prediction
MTBF
(Bell Core)
1. Test Condition :
Follow up "BenQ components de-rating
design
guideline" (Excluding CCFL lamp in
MTBF test)
2. Criteria inspection :
MTBF≧60000hrs
Release MTBF report on C5 stage.
Same as Ver.0 1 0 0 0
2 MTBF
Demonstrat
ion
1. Demonstrated MTBF ≧60000 hours at
25℃
(Excluding CCFL lamp in MTBF test)
Load: Maximum loading.
AC input voltage: 115/230V.
Meeting 95% confidence level (2.9957).
Same as Ver.0 0 0 20 0

17
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
Input signal: all preset mode
2. Stress room temperature : 40± 5℃AF :
2.541
Activation Energy(Ea) : 0.5 ev
Duty cycle: 0.75 45 Min. on /15 Min.
off.
3 Lamp
decay life
time
1. Test condition :
Set Brightness at position "99" /Contrast at
position "50" in MTBF room at 40± 5℃.
AF : 2.541
2. Criteria inspection :
Life time >10000 hrs and lamp decay ≧
75% minimum.
N/A-- 0 0 0 0
4 End of life
test
1. Test condition :
Keep 2 sets done by MTBF testing and
continue
executing life test at room 40℃.
Input AC 110V or 220V at max. loading.
2. Assume 3 year product warranty
12960 hrs = 12hrs x 30D x 12M x 3Y at 25
℃.
3. Test plan :
How long will test?
D days= 12960hrs/24hrs(time/day)*2.541
= 213 days at 40℃
4. Criteria inspection :
Life time >12960 hrs at 25℃normality.
Product is repairable and supported during
specified life time. End of life test must be
done in major product; the extension model
can be optional.
Same as Ver.0 0 0 3 0
5 AC / DC
Power
Variation
Test
Test condition :
AC input variance of change value upper and
lower limitation with frequency.
AC 90 ~ 264V, Frequency 47-63 Hz
Same as Ver.0 2 2 2 2

18
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
Criteria inspection :
The performance and function shall be
normality.
6 Condensati
on Test
Test condition :
1. To put set without packing and
non-operating into chamber at -20℃for 4
hrs min.
2. Then move DUT back to room ambient 25
℃, stay 0.5 hrs for recovery.
3. To turn on/off 20 times each time interval
at least 5 minutes at moisture condensing
condition.
Criteria inspection :
1. During or after test which kind of Arcing,
Fire, Smoking or Leakage was not allowed.
2. Should be no permanent failure happed.
3. Any abnormal happened, should be
recoverable after 4hrs condensing
disappeared.
Same as Ver.0 2 2 2 2
7 Power
Cycling
Test
Test condition :
1. DUT go power cycling test with diagnostic
pattern under 40±5℃.
2. Total 300 cycles, each power cycle consists
of step as On: 5 minutes and Off : 1
minutes.
Criteria inspection :
After test could be power on and normal
operation.
Same as Ver.0 2 2 2 2
8 Cold Start
Test
Test condition :
1. AC 90 ~264V, 47~63 Hz.
2. 0℃and 40℃95% 4hrs min. at
non-operating
Criteria inspection :
The products should be powered on and
operated normally at specified lowest and
Test condition :
1. AC 90 ~264V, 47~63 Hz.
2. 0℃and 40℃90% 4hrs min. at
non-operating
Criteria inspection :
The products should be powered
on and operated normally at
2 3 3 2

19
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
highest operating temperature environment. specified lowest and highest
operating temperature
environment.
9 Operating
test
with
temp/humid
ity
Criteria inspection :
The products should be operated and
performance normally at specified
temperature environment.
Criteria inspection :
The products should be operated
and performance normally at
specified temperature environment.
11 Thermal
Profile Test
Test condition : 90~264Vac,
1. Electrical component de-rating
Beging measure component temperature
after power on for 3~4 hrs under 40℃
50% R.H.
2. Criteria spec. :
Follow up BenQ's components de-rating
designguideline.
3. Mechanical components at ambient 0~40
℃.
3.1 The plastic components thermal
deformation de-rating < 90% ×
component spec.
3.2 Handles ,Knobs ,grips, button etc. and
surface held or touched for short
periods only.
Metal : 40°C , Plastic : 45°C
3.3 Human maybe touch which external
surface.
Metal : 60℃, Plastic : < 65℃.
Same as Ver.0 1 1 1 1
Step Temperature
℃Humidity Duration
1 25 95% 2H
2 40 95% 6H
3 0 Free 6H
4 40 10% 6H
5 25 95% 2H
Duration : repeat 2 cycles
Test Condition: 0-40 ℃/10%-95%
Non- condensation.
Step Temperature
℃Humidity Duration
125 90% 2H
240 90% 6H
3 0 Free 6H
4 40 10% 6H
525 90% 2H
Duration : repeat 2 cycles
Test Condition: 0-40 ℃/10%-90%
Non- condensation.

20
BenQ's LCD TV Product of Reliability Design Guide Date :
25-04-2006 Rev. 1
No Reliability BenQ (Rev.0) BenQ (Rev.1) C3 C4 C5 ORT
18 Surge Test Surge Test (EN55024:1998), EN 61000-4-5
1KV line to line, 2KV line to ground on input
power lines.
Same as Ver.0 2 2 0 0
20 High /Low
margin load
test
This test produces the weak point concerning
the reliability and assurance of the DUT by
testing with a full load and at high ambient
temperature.
Test Condition :
1. Test Equipment : Walk-in type chamber
2. Test Method : 110-120 AC±10%,
220-240V±10%
Inspection after testing
Inspection of the performance, functional
operation shall be made after the DUT has
been allowed to be stored at the standard
environment condition over 2hrs.
Test Pattern : Test(A) and Test(B) shall be
done
separately.
Same as Ver.0 2 0 0 0
26 Strife Test Test condition : Temperature and Power on
cycling.
Same as Ver.0 2 4 4 2
△○
○□
△○
NOMAL
TEMP
2HrsOVER
50±2℃
48Hrs
△ ： SW ON
○ ： CHECK
□ ： ＳＷ OFF
NORMAL
TEMP
(A) Power Source ON/OFF Test for 48 hours (B) Input Signal Change Test for 48 hours
Power Cycling : 60sec. ON / 60 sec. OFF Power Cycling : 60sec. ON / 60 sec. OFF
Power Source : Maximum rating Power Source : Maximum rating
Input Signal : Highest Frequency Input Signal : All Preset Timing
Contrast Control : max. Contrast Control : max.
Brightness Control : max. Brightness Control : max.
ScreenSize : Preset size ScreenSize : Preset size