Olevia LT26HVX Service Manual
DigiMedia
Service Manual
LCD TV For LT26HVX
Doc. No.：
Version：1.0
Total Pages：34
Approvals
Job Function Signature Date
CPO
Project Manager
R&D Dept. Manager
EE Dept. Manager
ME Dept. Manager
Engineering Dept. Manager
Sales Dept. Manager
Quality Assurance Dept. Manager
Author
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TITLE
Service Manual
LCD TV For LT26HVX
Table of Contents
1 Introduction……..…………..……………………………………… P3
1.1 Preface……………………………..……………………………………………… P3
1.2 Caution…………………………………..…...…………………………………… P3
1.3 W arning…………………………………………..………………………………. P3
2 System Block Diagram…………………………………………….. P4
2.1 System Block Diagram……………………………………………………………
2.2 Connector Connection Diagram………………………………………………….
2.3 Connector Pin Definition………………………………………………………...
3 Troubleshooting…………………………………………………….
3.1 No Power…………………………………………………………………………
3.2 No Sound…………………………………………………………………………
3.3 No Source Input……………………………………………………………………
3.4 Keypad Failed……………………………………………………………………
3.5 IR Failed……………………………………………………………………………
P4
P5
P6
P21
P21
P22
P23
P24
P25
4 Firmware upgrade applications……………………………………P26
5 Disaggregate Graphic………………………………….…………
P28
5.1 TV Tuner and Interface Module…………………………………………………
5.2 Stand Module………………………………………………………………...……
5.3 Back Cover………………………………………………………………………...
5.4 System Board…………………………..………….………………………………
5.5 Keypad Board……………………………………………..……...…...…………..
5.6 Speaker…………………………………………………..…………………….…..
5.7 Power Module…………....………………………………………………………..
5. LCD Panel Module………….……………………………..………………………
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P29
P30
P31
P32
P32
P33
P34
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Service Manual
LCD TV For LT26HVX
1. Introduction
1.1 Preface
This service manual aims directly at the module of LCD TV. It offers the simple repair which
emphasizes on technique explanation and production troubles to remove for the engineers and
technicians who have electronic background.
1.2 Caution
Be sure to read those ma nual before s ervicing. To assure safety from fire, electric shock, injur y,
harmful radiation and materials, various measures are provided in this Digimedia LCD TV. Be
sure to read cautionary items described in the manual to maintain safety before servicing.
1.3 Warning
1. Remember to unplug the AC cord from the AC outlet before cleaning the product. And do
not use liquid cleaners or aerosol cleaners to clean the display.
2. Do not place the product on an unstable place. It can c ause the product to fall, resulting in
serious personal injuries as well as damage to the product.
3. In case the product needs replacement parts, make sure that the service person uses
replacement parts specified b y the manufacturer, or those with the same characteristics and
performance as the original parts. Use of unauthorized parts can result in fire, electric shock
and/or other danger.
4. Do not overload AC outlets or extension cords. It can cause fire or electric shock.
5. The AC cords must be routed properly to preven t people from stepping on them or objects
from resting on them. Check the cords at the plugs and product.
6. Do not hit the panel. Be careful to prevent from getting hurt by broken glass pieces in case
the panel breaks.
7. Keep the product away from heat sources such as radiators, heaters, stoves and other
heat-generating products.
8. Do not place the display near water. Like bathtub, washbasin, kitchen sink and laundry tub,
swimming pool and in a wet basement.
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LCD TV For LT26HVX
2. System Block Diagram
2.1 System block diagram
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2.2 Connector Connection Diagram
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2.3 Connector Pin Definition
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SYSTEM BOARD
Function: VGA Signal In port
Connector type : D-Sub
Specification: CNNT-HD D Sub-H-F-3Row-15pin-Dip-BLU
Pin Definition
Pin No. Pin Name I/O Description
1 VGAR I 75 ohm termination, 0.7Vp-p red signal
2 VGAG I 75 ohm termination, 0.7Vp-p green signal
3 VGAB I 75 ohm termination, 0.7Vp-p blue signal
4 GND - GND 5 NC - No connection
6 GND - GND
7 GND - GND
8 GND - GND
9 VGA5V I VCC 5V IN
10 GND - GND
11 GND - 12 VGASDA I/O I2C data bus for Reading DDC data
13 VGA_HS I Horizontal Sync.
14 VGA_VS I Vertical Sync.
15 VGASCL I I2C clock bus for Reading DDC data
Function: DVI signal port
Connector type : DVI
Specification: CNNT-DVI-H-29PIN-1.9mm-1.5A-WHITE-dip
Pin Definition
Pin No. Pin Name I/O Description
1 RX2m I TMDS LVDS input signal
2 RX2p I TMDS LVDS input signal
3 GND - GND
4 NC - No connection
5 NC - No connection
6 DDC_CLK I I2C clock bus for Reading DDC data
7 DDC_DATA I/O I2C data bus for Reading DDC data
8 NC - No connection
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9 RX1m I TMDS LVDS input signal
10 RX1p I TMDS LVDS input signal
11 GND - GND
12 NC - No connection
13 NC - No connection
14 GDC5V VCC 5V
15 GND GND
16 HOTPLG VCC 5V
17 RX0m TMDS LVDS input signal
18 RX0p TMDS LVDS input signal
19 GND GND
20 NC - No connection
21 NC - No connection
22 GND GND
23 RXCp TMDS LVDS input clock
24 RXCm TMDS LVDS input clock
25 NC - No connection
26 NC - No connection
27 NC - No connection
28 NC - No connection
29 AGND - GND
30 AGND - GND
Function: PC Audio In
Connector type: RCA
Specification: CNNT-RCA white/red -F DIP RIGHT ANGLE 8.3ψ-4PIN
Pin Definition
Pin No. Pin Name I/O Description
1 GND - GND
2 AUD_R I Audio In_R
3 GND - GND
4 AUD_L I Audio In_L
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Function: RS-232 port
Connector type: Mini Din
Specification: CNNT-Mini Din-H-F-８pin-12ψ-Dip
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Pin Definition
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Pin No. Pin Name I/O Description
1 NC - No connection
2 FlsahDL# I Cable Plug In Detect
3 GND - GND
4 NC - No connection
5 NC - No connection
6 P_DGNS# - Download Function Control
7 PC_TXD O RS-232 Data Transmit
8 PC_RXD I RS-232 Data Receive
9 GND - GND
10 GND - GND
11 GND - GND
Function: Keypad In
Connector type: M15-I20001
Specification: CNNT M 15PIN pitch 2.0mm DIP Straight WST(blue)
Pin Definition
Pin No. Pin Name I/O Description
1 NC - NC
2 LED_B1 O Signal for Indicator LED
3 LED_B1 O Signal for Indicator LED
4 LED_B1 O Signal for Indicator LED
5 GND - GND
6 IRD I IR Data In
7 GND - GND
8 KEY_Y3 I Signal sent from Keypad to System 3
9 KEY_Y2 I Signal sent from Keypad to System 2
10 KEY_Y1 I Signal sent from Keypad to System 1
11 KEY_X3 O Signal sent from System to Keypad 3
12 KEY_X2 O Signal sent from System to Keypad 2
13 KEY_X1 O Signal sent from System to Keypad 1
14 GND - GND
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15 V5_IR O 5V POWER Out
Function: TUNER IN /AV IN
Connector type: BOARD TO BOARD
Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board)
Pin Definition
Pin No. Pin Name I/O Description
1 CHKTNR1 I CHECK AV Board In
2 V5_TUNER O POWER OUT_5V
3 V5_TUNER O POWER OUT_5V
4 GND - GND
5 GND - GND
6 NC - No connection
7 NC - No connection
8 NC - No connection
9 NC - No connection
10 GND - GND
11 HD_PR I HD_PR In
12 HD_PB I HD_PB In
13 HD_Y I HD_Y In
14 SV_SEL1 O S_Video_SEL
15 GND - GND
16 ALO_SC2 O Scart2 AUDIO_L CH out
17 ARO_SC2 O Scart2 AUDIO_R CH out
18 ALO_SC1 O Scart1 AUDIO_L CH out
19 ARO_SC1 O Scart1 AUDIO_R CH out
20 GND - GND
21 YCBCR_L O YCBCR AUDIO_L CH out
22 YCBCR_R O YCBCR AUDIO_R CH out
23 HDTV_L O HDTV_L AUDIO_L CH out
24 HDTV_R O HDTV_L AUDIO_R CH out
25 GND - GND
26 SIF1_IN I SIF format _IN1
27 SIF2_IN I SIF format _IN2
28 GND - GND
29 IF_TU2CVBS I Tuner2 CVBS IN
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30 IF_TU1CVBS I Tuner1 CVBS IN
31 GND - GND
32 V12_SYS2 O +12V OUT
33 NC - No connection
34 NC - No connection
35 V12_SYS2 O +12V OUT
36 PC2DTV_TX I PC TO DTV_TX IN
37 PC2DTV_RX I PC TO DTV_RX IN
38 S2DTV_TX I SYS TO DTV_TX IN
39 S2DTV_RX I SYS TO DTV_RX IN
40 RESETn I RESET
41 GND - GND
42 CVBS_SC1 I CVBS1 IN
43 IF_YCVBS I S-VIDEO1_Y In
44 IF_C I S-VIDEO1_C In
45 GND - GND
46 OCVBS_SC2 O Scart2 cvbs out
47 IF_CR I YCBCR_CR IN
48 IF_CB I YCBCR_CB IN
49 IF_Y I YCBCR_Y IN
50 GND - GND
51 DTV_PR I DTV_ Pr In
52 DTV_PB I DTV_ Pb In
53 DTV_Y I DTV_ Y In
54 TPA_MODE I CHECK EARPHONE CONNECT In
55 EPOUT_L O Audio EARPHONE L CH OUT
56 EPOUT_R O Audio EARPHONE R CH OUT
57 AMP_WF O Audio Sub woofer OUT
58 LINE_L O Audio Line L CH out
59 LINE_R O Audio Line R CH out
60 GND - GND
61 SAL_SC2 I Audio CVBS2/SV2 L ch in
62 SAR_SC2 I Audio CVBS2/SV2 R ch in
63 CVBSAL_SC1 I Audio CVBS1/SV1 L ch in
64 CVBSAR_SC1 I Audio CVBS1/SV1 R ch in
65 GND - GND
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LCD TV For LT26HVX
66 SCL O Software I2C Clk
67 SDA I/O Software I2C data
68 HWSDA I/O hardwae I2C data
69 HWSCL O hardwae I2C clk
70 GND - GND
71 CVBS_SC2 I CVBS2 IN
72 IF_YCVBS2 I S-VIDEO2_Y In
73 IF_C2 I S-VIDEO2_C In
74 ADC2 I A/D conver
75 DTV_L I Audio DTV L ch in
76 DTV_R I Audio DTV R ch in
77 ADC1 I A/D conver
78 DTV_SPDIF I DTV audio format
79 ADC0 I A/D conver
80 DTV_IR I DTV_IR pin
Function: LVDS output port
Connector type: TD01-30R1
Specification: CNNT-LVDS-F SMD STRAIGHT-V-30 PIN-1.25mm
Pin Definition
Pin No. Pin Name I/O Description
1 NC - No connection
2 GND - GND
3 NC - No connection
4 NC - No connection
5 NC - No connection
6 GND - GND
7 GND - GND
8 GND - GND
9 TXE3P O Positive LVDS differential data output
10 TXE3N O Negative LVDS differential data outpu
11 TXECKP O Positive LVDS differential clock out
12 TXECKN O Negative LVDS differential clock ou
13 GND - GND
14 GND - GND
15 TXE2P O Positive LVDS differential data output
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