Altek AELT27A1 User manual

27’’ LCD TV Color Monitor ALTEKAELT27A1
1
Service
Service
Service
Horizontal Frequency
31.5-60kHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
7. PCB Layout……….……………………....….......61
7.1 Main Board.……….......................................61
7.2 Power Board……..……..............................63
7.3 IR Board …................….......................66
7.4 DC-DC Board....…………...............................67
7.5 Earphone Board..…….....…..........................68
8. Block Diagram.…….........................................69
8.1 Main Board.………………………………..….69
8.2 Power Board…..…....………………….......70
8.3 Exploded View..……….....................…..71
9. Schematic Diagram………………………...73
9.1 Main Board………..………………………..73
9.2 Power Board.....…...................................83
9.3 Tuner Board...…….......................................87
9.4 Earphone Board...……..................................90
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
1. Monitor Specification..............................………........3
2. Operating Instructions…………………….……….......4
2.1 The Use Of Remote Control..……………...................4
2.2 The Use Of Teletext……..........…...........…...........5
2.3 Front Panel Control Knobs.…............……...............6
2.4 OSD Operations .………........................…............7
2.5 How To Connect ……..............……………............14
3 Input/Output Specification…………..........................18
3.1 Input Signal Connector……….……..........................18
3.2 RGB Input Signal Timing …….....……......................19
4. Repair Flow Chart ……………………….……….....20
5. White Balance Luminance Adjustment….…........26
6. BOM List..…………………………....….…….....30

27’’ LCD TV Color Monitor ALTEKAELT27A1
2
Revision List
Version Release Date Revision history TPV Model
A00 Jun.-21-2006 Initial Release EFF5MTNBC3ALTMP

27’’ LCD TV Color Monitor ALTEKAELT27A1
3
1. Monitor Specifications
Items Specification
Panel Type 27” CMO V270B1-L01 panel
Driver Element a-si TFT active matrix
Aspect Ratio 16: 9
Pixel Number 1366 x 768
Active Display Area H x V 596.259mmx335.232mm
Pixel Pitch 0.4365mm(H) x 0.4365mm(V)
Contrast Ratio 1000:1 (type)
Brightness 550:1 (type)
Response Time 8ms
View Angle (CR≥20) H: 176/V: 176
Display colors 16.7 million
Lamp Type/Life 60000 hr (type)
LCD Panel
Color Temperature Cool / Warm
Video Inputs AV、S-VIDEO, Component, Scart(RGB + Composite),HDMI
Audio Output Audio Output: L / R Headphone Mini-jack for stereo (3.5ø)
OSD language (default) English
Table Stand Included
Power Supply AC100V~240V, 50/60Hz
Power
Power Consumption <150W
Panel Tilt Forwards/Backwards/Rotation -4°/ +18° / ± 35°
Operating Tem. + 0 °C ~ + 40 °C
Storage Tem. - 25 °C ~ + 60 °C
Operating humidity 10% ~ 85%
Environment
Storage humidity 5% ~ 85%
2. Operations Instructions

27’’ LCD TV Color Monitor ALTEKAELT27A1
4
2.1 The Use of Remote Control

27’’ LCD TV Color Monitor ALTEKAELT27A1
5
2.2 The Use of Teletext

27’’ LCD TV Color Monitor ALTEKAELT27A1
6
2.3 Front Panel Control Knobs

27’’ LCD TV Color Monitor ALTEKAELT27A1
7
2.4 OSD Operations

27’’ LCD TV Color Monitor ALTEKAELT27A1
8

27’’ LCD TV Color Monitor ALTEKAELT27A1
9

27’’ LCD TV Color Monitor ALTEKAELT27A1
10

27’’ LCD TV Color Monitor ALTEKAELT27A1
11

27’’ LCD TV Color Monitor ALTEKAELT27A1
12

27’’ LCD TV Color Monitor ALTEKAELT27A1
13

27’’ LCD TV Color Monitor ALTEKAELT27A1
14
2.5 How to Connect
1

27’’ LCD TV Color Monitor ALTEKAELT27A1
15

27’’ LCD TV Color Monitor ALTEKAELT27A1
16

27’’ LCD TV Color Monitor ALTEKAELT27A1
17

27’’ LCD TV Color Monitor ALTEKAELT27A1
18
3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord
must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on
the connector to ensure firm grounding. The connector information is as follow:
1
6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description
1 Red Video
2 Green Video
3 Blue Video
4 N/C
5 GROUND
6 Red Video Ground
7 Green Video Ground
8 Blue Video Ground
9 No Pin
10 Sync. Ground
11 N/C
12 Serial Data for DDC
13 Horizontal Sync.
14 Vertical Sync.
15 Serial Clock for DDC
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel
warm-up. The Power-On indicator lights "GREEN" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.
If your TV requires service, it must be returned with the power cord.

27’’ LCD TV Color Monitor ALTEKAELT27A1
19
3.2 RGB Input Signal Timing
Horizontal Vertical Sync Polarity Presence Screen Mode
Frequency Frequency Horizontal Vertical Horizonta
l
Vertical Normal FULL
Dots ×Lines
(kHz) (Hz) (4:3) (16:9)
720×400 31.47 70.08 NEG POS YES YES YES YES
640×480 31.50 60.00 NEG NEG YES YES YES YES
640×480 37.50 75.00 NEG NEG YES YES YES YES
640×480 37.86 72.81 NEG NEG YES YES YES YES
800×600 37.90 60.32 NEG NEG YES YES YES YES
800×600 46.90 75.00 NEG NEG YES YES YES YES
800×600 48.08 72.19 NEG NEG YES YES YES YES
1024×768 48.40 60.00 YES YES YES YES YES YES
1280×768 47.7 60 YES YES YES YES YES YES

27’’ LCD TV Color Monitor ALTEKAELT27A1
20
4. Repair Flow Chart
4.1 No Power (No LED indicator)
NG
Check power cord and board interface Plug in power cord and interface
OK
Check F901, BD901, D901, D902 NG Replace F901 or BD901 or D910 or D902
OK
Check IC981, D928 (12V)
Check IC901, Q901
NG Replace IC981or D928
Check Q924, IC924 (ON/OFF signal) NG Replace Q924 or IC924
OK
OK
Check T951
OK
NG
Replace T951
Replace IC901 or Q901
OK
Check Q942, Q943
Check IC941, Q941 Replace IC941, Q941
OK
NG
NG
NG Replace Q942 or Q943
Check IC927
Check the load
OK
NG Replace IC927