Olevia LT37HVS Service Manual
DigiMedia
Service Manual
LCD TV For LT37HVS
Doc. No.：
Version：1.0
Total Pages：39
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CPO
Project Manager
R&D Dept. Manager
EE Dept. Manager
ME Dept. Manager
Engineering Dept. Manager
Sales Dept. Manager
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Author
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TITLE
Service Manual
LCD TV For LT37HVS
Table of Contents
1 Introduction……..…………..……………………………………… P3
1.1 Preface……………………………..……………………………………………… P3
1.2 Caution…………………………………..…...…………………………………… P3
1.3 Warning…………………………………………..………………………………. 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……………………………………………………………………………
3.6 Indicator LED Failed……………………………………………………………
P4
P5
P6
P26
P26
P27
P28
P29
P30
P31
4 Firmware upgrade applications…………………………………… P32
5 Disaggregate Graphic………………………………….……………
P34
5.1 TV Box……………………………………………………………………………
5.2 Stand Module………………………..…………………………………………….
5.3 Back Cover………………………………………………………………………...
5.4 System Board…………………………..………….……………………………..
5.5Indicator Board Module……………………………………....……...…………..
5.6 Keypad Board……………………………………………..……...…...…………..
5.7 Speaker…………………………………………………..…………………….…..
5.8 Power Module…………....………………………………………………………..
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P34
P34
P35
P36
P36
P37
P37
P38
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LCD TV For LT37HVS
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 manual before servicing. To assure safety from fire, electric shock, injury,
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 cause 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 by 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 prevent 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 LT37HVS
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
Service Manual
LCD TV For LT37HVS
SYSTEM BOARD
Function: VGA Signal In port
Connector type :D-Sub
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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 sig
2 VGAG I 75 ohm termination, 0.7Vp-p green s
3 VGAB I 75 ohm termination, 0.7Vp-p blue si
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 dat
13 VGA_HS I Horizontal Sync.
14 VGA_VS I Vertical Sync.
15 VGASCL I I2C clock bus for Reading DDC da
Function: DVI/HDMI signal port
Connector type :HDMI
Specification:
HDMI/CRE-HM-19F4-01 CNNT HDMI Cnnt Right Angle M 2Row 19pin SMD
Pin Definition
Pin No. Pin Name I/O Description
1 RX2p I TMDS LVDS input signal
2 GND I GND
3 RX2m I TMDS LVDS input signal
4 RX1p I TMDS LVDS input signal
5 GND - GND
6 RX1m I TMDS LVDS input signal
7 RX0p I TMDS LVDS input signal
8 GND - GND
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9 RX0m I TMDS LVDS input signal
10 RXCp I TMDS LVDS input signal
11 GND - GND
12 RXCm I TMDS LVDS input signal
13 NC - No connection
14 NC No connection
15 DDC_CLK I/O I2C clock bus for Reading DDC data
16 DDC_DATA I/O I2C data bus for Reading DDC data
17 GND TMDS LVDS input signal
18 GDC5V I VCC5
19 HPD I HOT PLUG DETECT
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
Function: RS-232 port
Connector type: Mini Din
Specification: CNNT-Mini Din-H-F-8pin-12ψ-Dip
Pin Definition
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
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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
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
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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
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
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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
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
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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 Ch 3
10 TXE3N O Negative LVDS differential data output Ch 3
11 TXECKP O Positive LVDS differential clock output
12 TXECKN O Negative LVDS differential clock output
13 GND - GND
14 GND - GND
15 TXE2P O Positive LVDS differential data output. Ch 2
16 TXE2N O Negative LVDS differential data output. Ch 2
17 TXE1P O Positive LVDS differential data output. Ch 1
18 TXE1N O Negative LVDS differential data output. Ch 1
19 TXE0P O Positive LVDS differential data output. Ch 0
20 TXE0N O Negative LVDS differential data output. Ch 0
21 GND - GND
22 GND - GND
23 GND - GND
24 GND - GND
25 GND - GND
26 VCC - +5.0V power supply
27 VCC - +5.0V power supply
28 VCC - +5.0V power supply
29 VCC - +5.0V power supply
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30 VCC - +5.0V power supply
Function: Power Input 1
Connector type:M15-I25002
Specification:
CNNT M 15PIN pitch 2.5mm DIP straight
Pin Definition
Pin No. Pin Name I/O Description
1 +V5_SYS I DC Power 5V IN
2 +V5 I DC Power 5V IN
3 +V5 I DC Power 5V IN
4 +V5 I DC Power 5V IN
5 +V5 I DC Power 5V IN
6 GND - GND
7 GND - GND
8 GND - GND
9 GND - GND
10 +V5 I DC Power 5V IN
11 GND - GND
12 LCD_INVON O Inverter On/Off
13 PWSTBY O Standby Mode Power 5V
14 BRI O Backlight Brightness Control
15 GND - GND
Function: Power Input 2
Connector type:M11-I25002
Specification: CNNT M 11PIN pitch 2.5mm DIP straight
Pin Definition
Pin No. Pin Name I/O Description
1 +V12 I DC Power 12V IN
2 +V12 I DC Power 12V IN
3 +V12 I DC Power 12V IN
4 GND - GND
5 GND - GND
6 GND - GND
7 +12V I DC Power 12V IN
8 GND - GND
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