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SERVICE MANUAL
LCD Color Television
23HLV85
FILE NO. 050-200532
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MODEL : 23HLV85
8. SCHEMATIC DIAGRAM
TUNER/PC ......................................................................................................................................................... 1/16VCTI .................................................................................................................................................................... 2/16
INPUT ................................................................................................................................................................. 3/16
3D COMB............................................................................................................................................................ 4/16
ADC (COMP) ...................................................................................................................................................... 5/16
SIL9021 .............................................................................................................................................................. 6/16
FLI2300 ............................................................................................................................................................... 7/16
SCHEMATIC DIAGRAM STRUCTURE:
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "SERVICE SAFETY PRECAUTIONS" ON PAGE 3 OF
THIS MANUAL.
CAUTION: The international hazard symbols " " in the schematic diagram and the parts list designate components
which have special characteristics important for safety and should be replaced only with types identical to those in the
original circuit or specified in the parts list. The mounting position of replacements is to be identical with originals. Before
replacing any of these components, read carefully the SERVICE SAFETY PRECAUTIONS on the MANUAL for thismodel. Do not degrade the safety of the receiver through improper servicing.
NOTE:
1. RESISTOR Resistance is shown in ohm [K = 1.000, M = 1.000.000]. All resistors are 1/6W and 5%
tolerance carbon resistor, unless otherwise noted as the following marks.
1/2R = Metal or Metal oxide of 1/2 watt 1/2S = Carbon compsistion of 1/2 watt
1RF = Fuse resistor of 1 watt 10W = Cement of 10 watt
K = 10% G = 2% F = 1%2. CAPACITOR Unless otherwise noted in schematic, all capacitor values less than 1 are expressed in
?F, and the values more than 1 in pF.
All capacitors are ceramic 50V, unless otherwise noted as the following marks.
Electolytic capacitor Mylar capacitor
3. The parts indicated with " * " have special characteristics, and should be replaced with identical parts only.
4. Voltages read with DIGITAL MULTI-METER from point indicated to chassing ground, using a color bar signal with all
controls at normal, line voltage 220 volts.
5. Waveforms are taken receiving color bar signal with enough sensitivity.
6. Voltage reading shown are nominal values and may vary 20% except H.V.
* The information contained in this section subjects to model.
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8-1. WIRING DIAGRAM
2
10
7
5
1
6
8
9
3
12
13
13
11
CONT
ROLBOARD
MAINBOARD
ACPOWERBOARD
INVERTERBOAR
D
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8-2. BLOCK DIAGRAM
LVDS
orTTL
OUT
R G B
8 8
PC_
R,G,B
3
Y,PB,PR
8
Y,Pb,Pr
3
SIDE_
V
SIDE_
Y,C
& L,R
R
LA7222C
L,R
R,G,B
CVBS_
IN
NTSC_
IF
MST9883
ADC
RAM
GM5221
SCALER
(IC901)
ROM
TC90A65F
3DComb
VCTi_Videoout
3D_
Comb_
Y,C
2
R,G,B
8
FLI2300
65
6FORMAT
8
TPA3008
A
MP
AUDIO_
OUT
VCT49xyI
VCTI
(IC1)
SIL9021
LA7222C
_L,R
n_
L,R
AudioDAC
HDMIin_
L,R
M52758S/W
b,Pr,_
IN
LA7222C
L/R
R_
IN
3
66
67-70
64-65
3
3
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1. Video Controller Unit & Display Data Conversion Unit
The video controller unit receives the video signals inputted through the tuner, AV port (VIDEO1, VIDEO2), and
converts them into an ITU656 signal through the microcomputer (VCTI) combined with the video decoder that
integrates various functions in one chip.Either the analog RGB(FLI2300) signal or PC RGB signal is selected by the switching IC and inputted to a
scaler (GM2221), which is sent to the LCD module after being modified to an LVDS signal through the
integrated LVDS IC.
VCTi is the main microprocessor that handles video signal processing and sound signal processing.
It also manages the RF signals received from the tuner.
The scaler can control timing to fit into the LCD panel, and can also control the size and position of the input
signal.
2. Power Supply Unit
The power supply unit provides 5V, 15V and 33V DC power to the Mainboard.
The 33V is directly used for the tuner.
15V power is directly used by the sound amplifier IC and is also used to generate 5V and 3.3V power through the
Step-Down DC/DC Converter. 5V power is converted to 3.3V and 1.8V power through the regulator, which in
turn supplies electrical power for ICs such as VCTI and scaler.
* The information contained in this section subjects to model.
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-59-
23HLV85TUNER/PC
* The information contained in this section subjects to model.
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-60-
23HLV85VCTI
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23HLV85INPUT
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23HLV853D COMB
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-63-
23HLV85ADC(COMP)
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-64-
23HLV85SIL9021
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23HLV85FLI2300
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23HLV85SWITCH
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-67-
23HLV85SWITCH&BUFFER
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-68-
23HLV85AUDIO AMP
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-69-
23HLV85SCALER
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-70-
23HLV85POWER IN&INTERFACE
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23HLV85POWER
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23HLV85LED&IR
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-73-
23HLV85CONTROL&POWER
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-74-
23HLV85SIDE