LG TY-LCD20W / L202WA-BJB (CHASSIS:LM62C) Service Manual ▷ View online
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ⓒ
2008 LG Electronics. Inc. All right reserved.
DISASSEMBLY
Disassembly Hinge Cover.
Disassemble Power cord.
Remove the screws.
Disassemble Back cover
# 1
# 4
# 2
# 3
Disassembly Lamp Cable.
(After finished repair, necessarily insert pink color
cable in center)
(After finished repair, necessarily insert pink color
cable in center)
# 5
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ⓒ
2008 LG Electronics. Inc. All right reserved.
L
V D S
Analog I(R/G/B)
D-Sub
LIPS
Filter
5V
12V
5V
Regulator
3.3V
Vcc
5V
14.3Mhz
Inverter(4Lamps)
12V
Flash ROM
DVI-D
DVI(TMDS)
KEY
1.8V
3.3V
1.8V
3.3V
Module
SDA
/SCL
EEPROM
(EDID)
EEPROM
(System)
SDRAM
Memory
16Mbit X 2
166MHZ
3.3V
ADC
TMDS
R
x
Scaler
GM ACE
L
VDS
Tx
OSD
MCU
SSC
Buf
fer
GM5822H
EEPROM
(EDID)
CR
YST
AL
1680X1050@60
146Mhz
BLOCK DIAGRAM
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ⓒ
2008 LG Electronics. Inc. All right reserved.
DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part.
This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the
digital video signal using a pixel clock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is 146MHz In L206WTQ/WTG.
This part consists of the Scaler, ADC convertor, TMDS receiver and LVDS transmitter.
The Scaler gets the video signal converted analog to digital, interpolates input to 1680X1050(L206WTQ/WTG)
resolution signal and outputs 8-bit R, G, B signal to transmitter.
digital video signal using a pixel clock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is 146MHz In L206WTQ/WTG.
This part consists of the Scaler, ADC convertor, TMDS receiver and LVDS transmitter.
The Scaler gets the video signal converted analog to digital, interpolates input to 1680X1050(L206WTQ/WTG)
resolution signal and outputs 8-bit R, G, B signal to transmitter.
2. Power Part.
This part consists of the one 3.3V, and one 1.8V regulators to convert power which is provided 5V in Power board.
15V is provided for inverter in L206WTQ/WTG.
Also, 5V is converted 3.3V and 1.8V by regulator. Converted power is provided for IC in the main board.
The inverter converts from DC 15V to AC 820Vrms and operates back-light lamps of module in L206WTQ/WTG.
15V is provided for inverter in L206WTQ/WTG.
Also, 5V is converted 3.3V and 1.8V by regulator. Converted power is provided for IC in the main board.
The inverter converts from DC 15V to AC 820Vrms and operates back-light lamps of module in L206WTQ/WTG.
3. MICOM Part.
This part is include video controller part. And this part consists of EEPROM IC which stores FRC(OD) memory, control
data, Reset IC and the Micom.
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable.
The controlled data of each modes is stored in EEPROM.
data, Reset IC and the Micom.
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable.
The controlled data of each modes is stored in EEPROM.
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LIPS Board Block Diagram
ⓒ
2008 LG Electronics. Inc. All right reserved.
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER
ENERGY
TRANSFER
OUTPUT RECTIFIER
AND FILTER
15V
5V
GND
PHOTO-
COUPLER
ISOLATION
PWM
CONTROL
CIRCUIT
HVDC
100KHz
PRIMARY
SECONDARY
50 ~ 60Hz
SIGNAL
Collection
and
Feedback
Operation description_Power
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC,VCCI CISPR, the
circuit included a line-filter, across line capacitor and of course the primary protection fuse.
circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is for transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to
adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized, and
also the over power protection is also monitor by this part.
adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized, and
also the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the DC output changing status through a photo transistor to primary controller to
achieve the stabilized DC output voltage.
achieve the stabilized DC output voltage.
6. Signal collection.
This part function is to collect the any change from the DC output and feed back to the primary through photo
transistor.
transistor.
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