Prima LC-27U6, LC-32U5, LC-27U7 Service Manual

LCD TELEVISION

LC-U# serial

CONTENTS

Safety instructions………………………………………………………………………..…
Adjustment instructions …………………………….…….…………………………….…
Trouble shooting ……………………………………………………….……………………
Working principle analysis……………………………………………………….………….
Block diagram…………………………………..……………….……………….…………
IC block diagram………………………………………………………………………..……
Main assembly……………………………………………………………………………..…
Identification criteria for the bright spot and dark spot of the LCD screen………..….
Wiring diagram ……………………………………………………………..……………...
Troubleshooting charts………………………………………………………………..……
Schematic diagram (CPU and TV board) ……………………………………………..……
Schematic diagram (LC-23U7 and LC-27U7 power supply board)………………….…
Schematic diagram (LC-32U5 power supply board)…………………………….….…..

1
3
6
8
9
10
22
23
24
25
28
39
40

1

Safety instructions

1. Instructions

Be sure to switch off the power supply before replacing or welding any components or
inserting/plugging in connection wire Anti static measures to be taken (throughout the entire
production process!):
a) Do not touch here and there by hand at will;
b) Be sure to use anti static electric iron;
c) It’s a must for the welder to wear anti static gloves.
Please refer to the detailed list before replacing components that have special safety requirements.
Do not change the specs and type at will.

2. Points for attention in servicing of LCD

2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to
use the screen of the original model for replacement.

2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in
protecting yourself and the machine when testing the system in the course of normal operation or
right after the power is switched off. Please do not touch the circuit or the metal part of the module
that is in operation mode. Relevant operation is possible only one minute after the power is
switched off.

2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or
damage to the set.

2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,
laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc.
Otherwise bad effect will result.

2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into
the module, be sure to cut the power off immediately and do not move anything on the module lest it
should cause fire or electric shock due to contact with the high voltage or short circuit.

2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at
once. Likewise, if the screen is not working after the power is on or in the course of operation, the
power must be cut off immediately and no more operation is allowed under the same condition.

2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the
power is off because in this case relatively high voltage still remains in the capacitor of the driving
circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.

2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting
or extrusion, collision lest mishap should result.

2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary
to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and
ensure full grounding for all the parts that have to be grounded.

2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or
moving the set please take care not to touch or scratch them. Once they are damaged the screen

Attention: This service manual is only for service personnel to take reference with. Before

servicing please read the following points carefully.

2

would be unable to work and no way to get it repaired.

2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to
breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case
before the transportation or handling.

2.12 For the storage make sure to put it in a place where the environment can be controlled so as to
prevent the temperature and humidity from exceeding the limits as specified in the manual. For
prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one
place. The ambient conditions are tabulated as follows:

Temperature Scope for operation 0 ~ +50 oC

Scope for storage -20 ~ +60 oC

Humidity Scope for operation 20% ~ 85%

Scope for storage 10% ~ 90%

2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the
screen, as commonly called “ghost shadow”. The extent of the residual picture varies with the
maker of LCD screen. This phenomenon doesn’t represent failure. This “ghost shadow” may remain
in the picture for a period of time (several minutes). But when operating it please avoid displaying
still picture in high brightness for a long time.

3. Points for attention during installation

3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.

3.2 For service or installation it’s necessary to use specified screw lest it should damage the screen.

3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between
the screen and the glass will affect the receiving and viewing effect

3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and
insulation please take care to keep it in intactness so as to avoid hidden trouble.

3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.

3

Alignment instruction

1 Alignment equipment

PM5518 (video signal generator)
K-7253 (VGA signal generator)
CA210 (white balancer)

2 Alignment flow-chart

The alignment flow-chart is shown as fig-1

Fig-1 adjustment flow-chart

3 Unit adjustments
Connect digital board, CPU board and analog board according to wiring diagram, connect with
power and observe the display.
Method for entering factory menu: press “SLP”, “DSP”, “MENU” and “DSP” in turn to enter factory
menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust
value items, press “MENU” to exit.

Note: the white balance adjustment should be done under “nature” picture mode.

3.1 Initialization
Enter factory menu, select “Factory settings” sub-menu, and adjustment for items of table1.

Check DDC, HDCP KEY and CPU

Factory initialization setup

IF channel voltage of TV and AGC voltage adjustment

Support format of VGA pre-set

Adjustment for sub-brightness and white balance of VGA/HDMI (colo

r

temperature 6500k, 9300k and 12000k)

Adjustment for sub-brightness and white balance of YPbPr/YcbCr channel

Adjustment for sub-brightness and white balance of VIDEO channel

Preset ex-factory

4

Table1 sub-menu adjustment

Items Range Introduce

PW on LOGO ON/OFF Display 5s LOGO of turn on the TV

NO Sig LOGO ON/OFF If display LOGO in no signal

Black Screen BLUE/BLACK If display blue screen and white noise wave in no signal, setting

“BLUE”

MLK 120-159 Adjustment for clock frequency (MHz) of memorizer, setting “145”.

PIP Size Middle/Large Select two component of PIP: “SMALL AND MIDDLE” and “SMALL

AND BIG”, setting “MIDDLE”.

init EEprom Start? Eeprom Initialization (adjustment for EEprom data)

3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV
Input frequency for 45.75MHz and IF signal for 80dBV of TP1, adjust L107 to value 2.4v of TP2;
when increase 0.10MHz of TP1 input signal, the TP2 value 1.0v at least; but decrease 0.10MHz of
TP1 input signal, the TP2 value 4.0v at least.

3.3 VGA/DVI channel adjustment

3.3.1 Preset VGA channel mode
Input VGA signal (PATTERN: CROSS) of VG-849 or VG-848, select PROG850(640*400/85Hz),
auto adjustment until the screen is filled with picture. Use the same method to do auto adjustment
for the following items:

PROG851(640*480/72 Hz) PROG852(640*480/75 Hz) PROG853(800*600/56 Hz)
PROG854(800*600/60 Hz) PROG855(800*600/72 Hz) PROG856(1024*768/60 Hz)
PROG857(1024*768/70 Hz) PROG858(1280*768/75 Hz) PROG888(800*600/75 Hz)

PROG915(1152*870/75 Hz) PROG915 (1280*1024/60Hz)

3.3.2 Sub-brightness and White balance adjustment VGA/HDMI channel
a. Input VG-849 or VG-848 signal of VGA: PROG852(640* 480/75Hz) and eighth level gray-scale
signal of PATTERN. Use color analyzer CA210 to adjust sub-brightness and white balance.
b. Enter submenu of COLOR TEMP., Select 9300k of color temperature, set auto value of R, G and
B to 50. Enter submenu of white balance, preset value of offset_R, offset_G and offset_B to 125,
and preset value of gain-R, gain-G and gain-B to 100. Adjustment for brightness let the second level
brightness be 3nit at least.
c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level
be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of
gain_B, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285 and 293.
Adjustment offset_R, offset_G, offset_B, gain_R, gain_G and gain_B repeatedly until the value of
the two levels gray-scale be 285 and 293.
d. Select 6500k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50,
adjust R and G, let the color coordinate of the sixth level be 313 and 329. Adjust R and G repeatedly
until the color coordinate value to 313 and 329.
e. Select 12000k of color temperature, set auto value of R, G and B to 50. Fixed value of B to 50,
adjust R and G, let the color coordinate of the sixth level be 270 and 283. Adjust R and G repeatedly
until the color coordinate value to 270 and 283.

5

f. Input PROG852(640*480/75Hz) and the eighth level gray-scale of PATTERN signal of VG-849 to
HDMI, repeatedly the b-e course. In the HDMI channel, preset value of offset_R, offset_G and
offset_B to 15, preset value of gain_R, gain_G and gain_B to 25.

3.4 Adjustment for sub-brightness and white balance of YPbPr channel
a. Connect YPbPr signal of VG-849 and VG-848 to YPbPr terminal, input color signal of
PROG973(1080i)PATTERN964. Select AUTOTUNE item, wait for it displays “OK”. NOTE: Don’t
select AUTOTUNE item in other state.
b. Switch YPbPR signal of VG-849 and VG-848 output to the eighth gray-scale signal of
PROG973(1080i)PATTERN964. prset value of offset_R, offset_G and offset_B to 15 and gain-R,
gain-G and gain-B to 25. adjust brightness, let second bright to 3nit at least.
c. Fixed value of offset_B, adjust offset_R and offset_G, let the color coordinate of the second level
be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value of
gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285
and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two
levels gray-scale be fixed.
d. Input PROG977(720p), PROG978(480p) and PROG968(480i) mode for eighth level gray-scale
signal, let the color coordinate of the second level and the seventh level 285 and 293.

3.5 VIDEO channel adjustment (TV/VIDEO/S-VIDEO)
a. Connect color bar signal of AV (PM5518, NTSC , eight level gray-scale signal) to VIDEO1
terminal, enter factory menu, preset value of offset_R, offset_G and offset_B to 15 and gain-R,
gain-G and gain-B to 25, adjust brightness, let second bright to 3nit at least.
b. Fixed value of offset-B to 15, adjust offset_R and offset_G, let the color coordinate of the second
level be 285 and 293 and its brightness be 4-5nit more or less (it can not 3.5nit at least). Fixed value
of gain_B to 25, adjust gain_R, gain_G and gain_B, let the color coordinate of seventh level be 285
and 293. Adjustment offset_R, offset_G, gain_R and gain_G repeatedly until the value of the two
levels gray-scale be fixed.

4 Performance check

4.1 TV function
Enter searching menu → auto search, connect RF-TV terminal with central signal source and check
if there are channels be skipped

4.2 AV/S, YpbPr terminals
Input AV/S, HD signal, check if it is normal.

4.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640 X 480@60 Hz, check if the display is normal. If
interference exists, press the auto adjusts button on remote control again and check if it is normal.

4.4 HDMI terminal
Insert HDMI terminal, input signal of 640 X 480@60 Hz signal and check if the display is normal.

4.5 check sound channel
Check the speaker and headphone of each channel.

4.6 presetting before ex-factory

6

Tr ouble shooting

Before servicing please check to find the possible causes of the troubles according to the table
below.

1.Antenna(signal):

Picture is out of focus or jumping  Bad status in signal receiving

 Poor signal
 Check if there are failures with the electrical connector or

the antenna.

 Check if the antenna is properly connected.

Fringe in picture  Check if the antenna is correctly oriented.

 Maybe there is electric wave reflected from hilltop or

building.
Picture is interfered by stripe
shaped bright spots

 Possibly due to interference from automobile, train, high

voltage transmission line, neon lamp etc.

 Maybe there is interference between antenna and power

supply line. Please try to separate them in a longer

distance.

 Maybe the shielded-layer of signal wire is not connected

properly to the connector.
There appear streaks or light color
on the screen

 Check if interfered by other equipment and if interfered

possibly by the equipment like transmitting antenna,

non-professional radio station and cellular phone.

2.TV set:

Symptoms Possible cause

Unable to switch the power on  Check to see if the power plug has been inserted

properly into the socket.

No picture and sound  Check to see if the power supply of liquid crystal TV

has been switched on. (As can be indicated by the
red LED at the front of the TV set)

 See if it’s receiving the signal that is transmitted from

other source than the station

 Check if it’s connected to the wrong terminal or if the

input mode is correct.

 Check if the signal cable connection between video

source and the liquid crystal TV set is correct.

Item Setting Item Setting Item Setting

Picture mode NATURE OSD language English CCD OFF

Sound mode NORMAL HALFTONE 50 STEREO ON

N/R WEAK DURATION 30 VGA/HDMI NORMAL

SCREEN FULL MAG.C ON ANTENNA CATV

7

Deterioration of color phase or color
tone

 Check if all the picture setups have been corrected.

Screen position or size is not proper  Check is the screen position and size is correctly set

up.

Picture is twisted and deformed  Check to see if the picture-frame ratio is properly set

up.

Picture color changed or colorless  Check the “Component” or “RGB” settings of the

liquid crystal TV set and make proper adjustment

according to the signal types.
Picture too bright and there is
distortion in the brightest area

 Check if the contrast setting is too high.
 Possibly the output quality of DVD broadcaster is set

too high.

 It maybe also due to improper terminal connection of

the video signal in a certain position of the system.
Picture is whitish or too bright in the
darkest area of the picture

 Check if the setting for the brightness is too high
 Possibly the brightness grade of DVD player

(broadcaster) is set too high.
No picture or signal produced from the
displayer if “XXX in search” appears.

 Check if the cable is disconnected.
 Check if it’s connected to the proper terminal or if the

input mode is correct.
There appears an indication - “outside
the receivable scope)

 Check if the TV set can receive input signal. The

signal is not correctly identified and VGA format is

beyond the specified scope.

Remote control cannot work properly  Check if the batteries are installed in the reverse

order.

 Check if the battery is effective.
 Check the distance or angle from the monitor.
 Check if there is any obstruct between the remote

control and the TV set.

 Check if the remote control signal- receiving window

is exposed to strong fluorescence.
No picture and sound, but only hash.  Check if the antenna cable is correctly connected, or

if it has received the video signal correctly.
Blur picture  Check if the antenna cable is correctly connected.

 Of if it has received the right video signal.

No sound  Check if the “mute” audio frequency setting is

selected.

 Check if the sound volume is set to minimum.
 Make sure the earphone is not connected.
 Check if the cable connection is loose.

When playing VHS picture search
tape, there are lines at the top or
bottom of the picture.

 When being played or in pause VHS picture search

tape sometimes can’t provide stable picture, which

may lead to incorrect display of the liquid crystal TV,

In this case please press “auto” key on the remote

8

control so as to enable the liquid crystal TV set to

recheck the signal and then to display correct picture

signal

Working principle analysis

RF signal from the antenna to tuner, via high frequency amplifier and mix frequency to obtain IF
signal, and then via pre-IF amplifier in V104, then it send to processed IF filter of SAW (Z103),
obtain more idea IF speciality, it processed to IF amplifier, phase locked logic VCO and sync
detection of N101 (M52760E) in the TV board to obtain VIDEO; IF via pre IF amplifier to send to
processed filter of SAW (Z102), again send to processed IF amplifier of N101, decode second SIF.
From M52760E output VIDEO, AV1 and AV2/S signal all send to video decoder N601
(TVP5147PFP), via video select, clamping, A/D transfer, comb filter and color decode, one way
output AV OUT, another way output 8bit for CIR656 format signal and CLK signal, send to
N101(MST6151) of CPU board, Also YPbPr, VGA and HDMI send to N101. N101(MST6151) is
many function big dimension integrate circuit, it processed HDMI, A/D to DA switch, interlaced and
non-interlaced processing, model switch and low voltage difference output functions and so on, it
send to four ways difference signal and one way clock signal to LCD display.
From HDMI input to MST6151contain sound signal, via processed MST6151, send to processed
D/A switch for NA01(CS4340), output L/R of HDMI.
Output SIF from M52760F and send to processed stereo demodulation for N201(LA72700), output
L/R of TV.
L/R of HDMI and Ypbpr from CS4340 output, L/R of VGA/DVI signal via sound switch
NA02(HEF4052) to select, then send to sound processing N301(R2S15900SP); demodulate L/R
signal of LA72700 send to N301, and L/R signal for AV1A and V2/S input send to N301. Via
selected switch and processing sound, one way sound output for AV OUT, other way send to
N401(TPA3008D2) of sound amplifier, via amplify for sound signal to speaker and earphone.
The unit working is controlled N801(MTV412) of CPU, connect tuner, TVP5147, LA72700 and
R2S15900SP to IIC bus; connect MST6151 to parallel BUS.

BLOCK DIAGRAM

AV1-A AV2/S-A
YPbPr-A
VGA/DVI-A L/R

HDMI-A

L/R

A
AV OUT L/R
SIF

RF

IF

V
V IIC

VIDEO1
Y/VIDEO2 CCIR656
C 8bit

YPbPr
VGA
HDMI/DVI

HDMI-A

L/R

BUS

SCALER
A/D D/A
DEINTERLACER
LVDS
HDMI

N

101(CPU)

MST6151DA

VIDEO
DECORDER

N

601

TVP5147PFP

MCU

N

801

MTV412

SDRAM

N

201

SDRAM

N

202

SIF DEC

N

201

LA72700

AUDIO

PROCESSO

R

N

301

R2S15900SP

AUDIO AMP

N

401

TPA3008D2

EEPROM

N

802

EEPROM

N

803

AUDIO
SW

N

A02

HEF4052

IF AMP

N

101(TV)

M52760E

TUNER

SAW
Z103

SAW
Z102

SPEAKER

PANEL

DAC

N

A01

CS4340

HEADPHONE

9

10

IC block diagram

TVP5147

Composite and S-Video Processor

Y/C

Separation

5-li ne

Adaptive

Comb

Luma

Processing

Chroma

Processin

g

M
U
X

CVBS/Y

C/CbCr

C

Y

Output

Formatter

Y[9:0]

VBI

Data

Proces s o r

Copy

Prot ection

Detector

C[9:0]

Host

Interface

Timing Proces sor

With Sync Detector

VI_1_A
VI_1_B

VI_1_C

VI_2_A
VI_2_B

VI_2_C

VI_3_A
VI_3_B

VI_3_C

VI_4_A

CVBS/

Y

CVBS/

C/Pb

CVBS/

C/Pr

CVBS/Y

CVBS/Y

Analog

Front End

Sampling
Clock

GPIO

HS/CS

VS/VBLK

FID

AVID

XTAL1

XTAL2

DAT ACLK

RESETB

GLCO

PWDN

SCL

SDA

YCbCr

Clamping

AGC

2 11-Bit

ADC

80: A V OUT
2: TV-V input
7: A V1-V input
9: A V2-V/S-Y input
18: S-C input
29: SDA
28: SCL
40: CLK output
43-47, 50-52: CCIR656 format signal output
4, 5, 20, and 21: 3.3V-A power supply
38, 48, 61: 3.3V-D power supply
11, 25, 76: 1.8V-A power supply
31, 41, 55, and 67: 1.8V-B power supply

11

M52760

2: AFT
3: AGC
4, 5: picture If input
7: sound IF input
13: SIF output
10: mono sound output
18: TV- VIDEO output
14, 17: +5V-1 power supply

12

LA72700

5: SIF input
25: TV sound -R output
26: TV sound- L output
11: SDA
12: SCL
31: +9Vpower supply

13

MST6151

207, 208: HDMI-R input
2, 3: HDMI-G input
5, 6: HDMI-B input
8, 9: HDMI-CLK input
14: HDMI-SDA
15: HDMI-SCL
20, 21: VGA-B input
22: VGA-G input
23, 24: VGA-G input
25, 26: VGA-R input
18: VGA H-sync input
19: VGA V-sync input
27, 28: PB input
29, 30: Y input
31: HDMI-G input
32, 33: PR input
54-61: CCIR656 format signal input
53: CLK input
164-171, 174: 4 difference signal output
160, 161: 1 clock signal output
188-191: HDMI sound output
200: PWW (brightness control switch) output
72-75: BUS (parallel communication signal)
49, 131, 195: 1.8V power supply
4,17,12,109,204,66,102: 3.3V power supply

14

PIN DIAGRAM (MST5151A)

Pin 1

1
2
3
4
5

7

9

11

13
14

17
18

21

23

25

27
28

30

32

34

36

39

41

43

6

8

10

12

15
16

19
20

22

24

26

29

31

33

35

37
38

40

42

44
45
46
47
48

50
51
52

49

5354555657

59

61

636566

69

70

73

75

777980

82

84

86

88

91

93

95

58

60

62

64

67

68

717274

76

78

81

83

85

878990

92

9496979899

100

102

103

104

101

208

207

206

205

204

202

200

198

196

195

192

191

188

186

184

182

181

179

177

175

173

170

168

166

203

201

199

197

194

193

190

189

187

185

183

180

178

176

174

172

171

169

167

165

164

163

162

161

159

158

157

160

156
155
154
153
152

150

148

146

144
143

140
139

136

134

132

130
129

127

125

123

121

118

116

114

151

149

147

145

142
141

138
137

135

133

131

128

126

124

122

120
119

117

115

113
112
111
110
109

107
106
105

108

MVREF

GND

VDDM

MST5151A

XXXXXXXXXXX

XXXXX

GND

AVDD_MPLL

XIN

XOUT

PWM1

PWM0

AIWS

AISCK

VDDC

SPDIFO

AUWS

AUSD

LVB0M

VDDC

GND

VDDP

AISD

AIMCK

GND

AUMUTE

AUSCK

AUMCK

LVB0P

GND

LVB1M

LVB1P

LVB2M

LVB2P

LVBCKM

LVBCKP

LVB3M

LVB3P

VDDC

GND

LVA0M

LVA0P

LVA1M

LVA1P

LVA2M

LVA2P

LVACKM

LVACKP

GND

VDDP

LVA3M

LVA3P

GND

BYPASS

GND

DVI_R-

DVI_R+

GND

GND

DVI_G+

DVI_G-

AVDD_DVI

DVI_B+

DVI_CK+
AVDD_DVI
AVDD_PLL

DDCD_DA

GND

HSYNC1

BIN1P

BIN1M

DVI_B-

GND

DVI_CK-

REXT

GND

DDCD_CK

AVDD_ADC

VYSNC1

SOGIN1

GIN1P

GIN1M

RIN1P
RIN1M
BIN0M

BIN0P
GIN0M

GIN0P

SOGIN0

RIN0M

RIN0P

AVDD_ADC

GND
HSYNC0
VSYNC0

RMID

REFP

REFM
VI_DATA[8]
VI_DATA[9]

VI_DATA[10]
VI_DATA[11]
VI_DATA[12]
VI_DATA[13]
VI_DATA[14]
VI_DATA[15]

AVDD_APLL

GPO[5]
GPO[4]

GND

VI_CK

VI_DATA[0]

VI_DATA[1]

VI_DATA[2]

VI_DATA[3]

VI_DATA[4]

VI_DATA[7]

GND

VDDP

INT

RDZ

DBUS[0]

DBUS[1]

VI_DATA[5]

VI_DATA[6]

VDDC

GND

HWRESET

ALE

WRZ

DBUS[2]

DBUS[3]

GPO[3]

GPO[2]

GPO[1]

VDDC

GND

MDATA[31]

MDATA[30]

MDATA[29]

MDATA[28]

VDDM

GND

MDATA[27]

MDATA[26]

MDATA[25]

MDATA[24]

MDATA[23]

MDATA[22]

MDATA[21]

MDATA[20]

MDATA[19]

MDATA[18]

MDATA[17]

MDATA[16]

DQS[2]

VCTRL

DQS[3]

DQM[1]

DQS[0]
MDATA[0]

GND
VDDC

MADR[10]
MADR[9]
MADR[8]
GND
VDDM
MADR[7]
MADR[6]
MADR[5]
MADR[4]
MADR[3]
MADR[2]
MADR[1]
MADR[0]
WEZ
CASZ
GND
VDDM
RASZ
BADR[0]
BADR[1]
AVDD_PLL2
GND
MCLK
MCLKZ
MCLKE

MDATA[1]
MDATA[2]
MDATA[3]
MDATA[4]
MDATA[5]
MDATA[6]
MDATA[7]
MDATA[8]
MDATA[9]
MDATA[10]
MDATA[11]
GND
VDDM
MDATA[12]
MDATA[13]
MDATA[14]
MDATA[15]
DQS[1]
DQM[0]

MADR[11]

VDDC
GND
VDDM

15

PIN DESCRIPTION

MCU Interface

Pin Name Pin Type Function Pin

HWRESET

Schmitt Trigger Input

w/ 5V-tolerant

Hardware Reset, active high 67

DBUS[3:0] I/O w/ 5V-tolerant MCU 4-bit DDR Direct bus; 4mA driving strength 75-72
ALE I w/ 5V-tolerant MCU Bus ALE, active high 69
RDZ I w/ 5V-tolerant MCU Bus RDZ, active high 70
WRZ I w/ 5V-tolerant MCU Bus WDZ, active high 71
INT Output MCU Bus Interrupt; 4mA driving strength 68

Analog Interface

Pin Name Pin Type Function Pin

RMID Mid-Scale Voltage Bypass 38
REFP Internal ADC Top De-coupling Pin 39
REFM Internal ADC Bottom De-coupling Pin 40
REXT Analog Input External Resister 390 ohm to AVDD_DVI 11
HSYNC0

Schmitt Trigger Input w/

5V-tolerant

Analog HSYNC Input from Channel 0 36

VSYNC0

Schmitt Trigger Input w/

5V-tolerant

Analog VSYNC Input from Channel 0 37

BIN0M Analog Input Reference Ground for Analog Blue Input from Channel 0 27
BIN0P Analog Input Analog Blue Input from Channel 0 28
GIN0M Analog Input Reference Ground for Analog Green Input from Channel 0 29
GIN0P Analog Input Analog Green Input from Channel 0 30

SOGIN0 Analog Input Sync On Green Input from Channel 0 31

RIN0M Analog Input Reference Ground for Analog Red Input from Channel 0 32
RIN0P Analog Input Analog Red Input from Channel 0 33
HSYNC1

Schmitt Trigger Input w/

5V-tolerant

Analog HSYNC Input from Channel 1 18

VSYNC1

Schmitt Trigger Input w/

5V-tolerant

Analog VSYNC Input from Channel 1 19

BIN1P Analog Input Analog Blue Input from Channel 1 20
BIN1M Analog Input Reference Ground for Analog Blue Input from Channel 1 21
SOGIN1 Analog Input Sync On Green Input from Channel 1 22
GIN1P Analog Input Analog Green Input from Channel 1 23
GIN1M Analog Input Reference Ground for Analog Green Input from Channel 1 24
RIN1P Analog Input Analog Red Input from Channel 1 25
RIN1M Analog Input Reference Ground for Analog Red Input from Channel 1 26

16

DVI Interface

Pin Name Pin Type Function Pin

DVI_R+ Input DVI Input Channel Red + 207
DVI_R- Input DVI Input Channel Red - 208
DVI_G+ Input DVI Input Channel Green + 2
DVI_G- Input DVI Input Channel Green - 3
DVI_B+ Input DVI Input Channel Blue + 5
DVI_B- Input DVI Input Channel Blue - 60
DVI_CK+ Input DVI Input Clock + 8
DVI_CK- Input DVI Input Clock - 9

Video Interface

Pin Name Pin Type Function Pin

VI_CK Input w/ 5V-tolerant Digital Video Input Clock 66
VI_DATA[15:0] Input w/ 5V-tolerant Digital Video Input Data[15:0] 48-41, 61-54

Digital Audio Interface

Pin Name Pin Type Function Pin

AUMCK Output Audio Master Clock Output 188
AUSD Output Audio Serial Data Output; 4mA driving strength 189
AUSCK Output Audio Serial Clock Output; 4mA driving strength 190
AUWS Output Word Select Output; 4mA driving strength 191
AUMUTE Output Audio Output Mute Control 192
SPDIFO Output S/PDIF Audio Output; 4mA driving strength 193

AIMCK Input Audio Master Clock Input 196

AISD Input Audio Serial Data Input 197
AISCK Input Audio Serial Clock Input 198
AIWS Input Word Select Input 199

LVDS Interface

Pin Name Pin Type Function Pin

LVA0M Output A-Link Negative LVDS Differential Data Output 171
LVA0P Output A-Link Positive LVDS Differential Data Output 170
LVA1M Output A-Link Negative LVDS Differential Data Output 169
LVA1P Output A-Link Positive LVDS Differential Data Output 168

17

Pin Name Pin Type Function Pin

LVA2M Output A-Link Negative LVDS Differential Data Output 167
LVA2P Output A-Link Positive LVDS Differential Data Output 166
LVA3M Output A-Link Negative LVDS Differential Data Output 161
LVA3P Output A-Link Positive LVDS Differential Data Output 160
LVACKM Output A-Link Negative LVDS Differential Data Output 165
LVACKP Output A-Link Positive LVDS Differential Data Output 164
LVB0M Output B-Link Negative LVDS Differential Data Output 187
LVB0P Output B-Link Positive LVDS Differential Data Output 186
LVB1M Output B-Link Negative LVDS Differential Data Output 181
LVB1P Output B-Link Positive LVDS Differential Data Output 180
LVB2M Output B-Link Negative LVDS Differential Data Output 179
LVB2P Output B-Link Positive LVDS Differential Data Output 178

LVB3M Output B-Link Negative LVDS Differential Data Output 175

LVB3P Output B-Link Positive LVDS Differential Data Output 174
LVBCKM Output B-Link Negative LVDS Differential Data Output 177
LVBCKP Output B-Link Positive LVDS Differential Data Output 176

GPO Interface

Pin Name Pin Type Function Pin

PWM0 Output GPO with PWM Function; 4mA driving strength 200
PWM1 Output GPO with PWM Function; 4mA driving strength 201
GPO[1] I/O GPO / FIELD input; 4mA driving strength 78
GPO[2] I/O GPO / Digital VSYNC Input; 4mA driving strength 77

GPO[3] I/O GPO / DE Input; 4mA driving strength 76

GPO[4] I/O GPO / Secondary Video Clock Input

; 4mA driving

strength

52

GPO[5] I/O GPO / Digital HSYNC Input; 4mA driving strength 51

DRAM Interface

Pin Name Pin Type Function Pin

MVREF Input

Reference Voltage for DDR SDRAM

Interface

104

MCLKE Output DRAM Memory Clock Enable 105
MCLKZ Output

DRAM Memory clock Complementary /Input

106

18

Pin Name Pin Type Function Pin

(for differential clocks)
MCLK Output DRAM Memory Clock 107
RASZ Output Row Address Strobe, active low 112
CASZ Output Column Address Strobe, active low 115
WEZ Output Write Enable, active low 116
DQM[1:0] Output Data Mask Byte Enable 101, 133
DQS[3:0] Output Data Strobe 81, 100, 134, 153
BADR[1:0] Output Memory Bank Address 110, 111
MADR[11:0] Output Memory Address 130-127, 124-117
MDATA[31:0] I/O Memory Data 82-85, 88-

99,

135-138, 141-152

Misc. Interface

Pin Name Pin Type Function Pin

XIN Crystal Oscillator Input Crystal Oscillator Input 203
XOUT Crys

tal Oscillator

Output

Crystal Oscillator Output 202

DDCD_DA I/O w/ 5V-tolerant HDCP Serial Bus Data /

DDC data of DVI port; 4mA

driving strength

14

DDCD_CK Input w/ 5V-Tolerant HDCP Serial Bus Clock / DDC Clock of DVI Port 15
BYPASS For External Bypass Capacitor 158
VCTRL Output Regulator Control 62

Power Pins

Pin Name Pin Type Function Pin

AVDD_DVI 3.3V Power DVI Power 4, 10
AVDD_ADC 3.3V Power ADC Power 17, 34
AVDD_PLL 3.3V Power PLL Power 12
AVDD_PLL2 3.3V Power PLL Power 109
AVDD_APLL 1.8V Power Audio PLL Power 49
AVDD_MPLL 3.3V Power PLL Power 204
VDDM

3.3V Power (SDR SDRAM) /

2.5V Power (DDR SDRAM)

DRAM Interface Power

86, 102, 113, 125, 139,

154
VDDP 3.3V Power Digital Output Power 66, 162, 182
VDDC 1.8V Power Digital Core Power 63, 7

9, 131, 156, 173,

185, 195

19

Pin Name Pin Type Function Pin

GND Ground Ground

1, 7, 13, 16, 35, 50, 64,

65, 80, 87, 103, 108,

114, 126, 132, 140,

155, 157, 159, 163,

172, 183, 184, 194,

205, 206

20

R2S15900

2: input L of AV1
27: input R of AV1
3: input L of AV2/S
26: input R of AV2/S
4: input L of YPBPR/VGA/HDMI
25: input R of YPBPR/VGA/HDMI

21

5: input L of TV
24: input R of TV
6: output L of AVOUT
23: output R of AVOUT
11: L output
19: R output
18: SCL
17: SDA
28: +9Vpower supply

TPA3008

1: MUTE
3: R input
5: L input
20, 17: L input
41, 44: R input
15, 23, 33, 39, and 47: +18V power supply

22

Main assembly

NAME NO. MAIN COMPONENT AND it’S NO.

TV board 667-L27U6-40 N101

N201

N301

N401

M52760 (352-52760-10)

LA72700 (353-72700-10)

R2S15900 (353-15900-10)

TPA3008D2 (353-30080-10)

CPU board 667-L27U6-56 N101

N601

NA01

N801

MST6151DA (353-61510-10)

TVP5147 (353-51470-10)

CS4340 (353-43400-30)

MTV412 (353-04120-10)

Keypad board 667-L27U6-05

Remote control 301-RL27U6-27M (RC-R27M)

MODEL LC-23U7

(203-L27U70-01)

LC-23U7
(203-L27U70-02)

LC-27U6/27U7 LC-32U5

Power supply

board

667-L27U6-20 667-L23U6-20 667-L27U6-20 667-L32K5-20

IR board 667-L27U6-09 667-L27U6-09 667-L27U6-09 667-L32U5-09

Panel 335-23002-00 335-23004-00 335-27001-00 335-32002-00

23

Identification criteria for the bright spot and dark spot of the LCD screen

Q’ty allowed Distance between two spots

Category criteria

15" 20" 22" 30" 40" 15" 20" 22" 30" 40"

One single

spot

≤5 ≤2 ≤5 ≤2 ≤3

2 neighboring

spots

≤2 ≤1 ≤2 ≤1 ≤1

Bright

spo

t

Total No. ≤5 ≤2 ≤5 ≤2 ≤3

≥15mm

One single

spot

≤6 ≤7 ≤5 ≤4 ≤10

Two

neighboring

spots

≤2 ≤2 ≤2 ≤1 ≤5

Dark

spots

Total No. ≤6 ≤7 ≤5 ≤4 ≤10

≥15mm

≥10mm

≥5mm

Total defected point ≤8 ≤7 ≤5 ≤4 /

Notes:

1. Definition of defected point (bright spot, dark spot): It is identified as a defected point if its area
exceeds 1/2 of a single picture element (R,G,B).

2. Definition of bright spot: It is identified as a bright spot if it is bright in the state of dark field and its
bright size remains unchanged

3. Definition of dark spot: It is identified as a dark spot if it is dark in the state of white field and its
dark size remains unchanged

4. Definition of two neighboring points: Defects of a group of picture elements(RB,RG,GB).

24

Wiring diagram

25

Troubleshooting guide

1. No raster

Turn-on power supply, chec

k

if the red indicator is light in
the STANDBY?

Check if PIN8(5V) of CPU
board is normal?

Check STANDBY circuit o

f

power supply board

Press POWER button in the
unit button and sensor control,
check the indicator.

Check if the PIN12 of X503 in
CPU board is high-level?

Check if the PIN12 of X501 i

n

CPU board is high-level?

Check power supply board

Check back light board

yes

no

no

blue

red

no

yes

Replacing N801

no

yes

26

2. Raster, but no picture

Check if the unit butto

n

and sensor control
operation?

Check if the all
channels have signal?

Replacing
CPU board

Enter factory-menu,
initialization EEPROM,
then turn off the TV,
turn on again, displa

y

picture?

Adjust CPU boar

d

again

Which is no
signal o

f

channels

Replacing
CPU board

Check if 1VPP signal
and noise wave o

f

X12 (PIN 1) in the
TV board?

Check if outpu

t

IF signal o

f

TUNER1 (pi

n

11) is normal?

Replacing

TUNER1

Check N101

no

yes

yes

HDMI/VGA/YPRP

TV

yes

no

no

no

yes

Does display OSD
menu in screen whe

n

press submenu?

yes

no

yes

27

3.no sound

Check if PIN15, PIN30
and PIN38 voltage o

f

N

401 is normal?

Check power supply

Check PIN11 an

d

PIN19 output wave o

f

N

301

Check PIN25 an

d

PIN26 output wave o

f

N

201

Check PIN5 wave o

f

N

201

Check PIN11 wave of
TUNER1

Replacing N401

Replacing N301

Replacing N201

no

yes

no

yes

yes

yes

no

no

Replacing TUNER1

no

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

3

3

BAS21

C

J1

1

1

2

TOP

1

1

2

3

E

TL431

2

TOP

TOP

2

TOP

BCX53-16

TOP

MUR860

BCX56-16

ISL9R1560G2

1

12

B

J1

0.35mm 辅铜

KAS200-5S242212

A0

PFC INPUT AND STNADBY

LC-32U5 POWER SUPPLY BOARD

A3

23Tuesday, March 15, 2005

Title

Size Document Number Rev

Date: Sheet

of

VCC1

B

A

ON_OFF_1

PFC 3

VCC1_1 3

A3

B3

D13

ON_OFF 3

STD-5V

STD-5V

R932
330K ±5%

D903
1N4007

1 2

R920
10 ±5%

C907
1000PF/50V

R969

5.1K ±5%

R927
360K ±5%

D908
BAS21

1 3

2

C917

100PF/50V

C918

0.22UF/50V 1206

R968
100K ±5%

Q908
BCX56-16

3

21

PFC

TEST

1

1

R936
360K ±5%

JP?
JUMPER

1 2

+

E904

1000UF/16V

C901
2200PF/4KV

R917

5.1K ±5%

C909
1UF/50V

R934
10 ±5%

R910
200K ±5%

R902
1M ±5% 1206

R943
360K ±5%

L901 LCM-300

12

M1
HOLE_3.5/9.4

1

D910

MURS160T3

1 2

C911
1UF/50V

D904
1N4007

12

Q909
BCX56-16

3

21

R956

24K ±5%

C908

0.1UF/50V

R929
10K ±5%

C914

0.47UF/50V

R955

150K ±5%

D902

STTA806

1 2

IC901

PC817A

1

2 3

4

R507

110 ±5%

R948
56K ±5%

IC917
PC817A

1

23

4

IC902

L4981AD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

P-GND

IPK

OVP

IAC

CA-OUT

LFF

VRMS

MULT-OUT

ISENSE

S-GND

VREF

SS

VA-OUT

VFEED

P-UVLO

SYNC

ROSC

COSC

VCC

GDRV

Q903
BT169

31

2

R904

1M ±5% 1206

R965

5.1K ±5%

R915
200K ±5%

R903
MYG-10K-561

L903

8mH,LXET24-4

4 1

3 2

5

67

8

IC905
TL431A

2 3

1

C913

0.22UF/50V

L905
LGB-6R9

1 2

L904

JCLPQ32-2

2
3

5
6

7

8

R506
470 ±5%

D911

MURS160T3

1 2

R925
360 ±5%

+

E907

470UF/16V

L902

4.7mH,LXET24-3

4 1

3 2

5

67

8

D907

1.5KE200A

12

D906

MURS160T3

12

R957
47K ±5%

R921
200K ±5%

R954
330K ±5%

+

E909
33UF/100V

C916
1UF/50V

C915

0.1UF/50V

R928

2.2 ±5%

R990
470 ±5%

CN901

VH-3AW

1

2

3

L

NC

N

R912
? /1W

Q904
BCX56-16

3

21

C905

0.47UF/450V

R914
1K ±5%

R958
1K ±5%

C910
1000PF/2KV

R945
330K ±5%

R938

510 ±5%

R963
1K ±5%

R976

100K ±5%

R967

4.75K ±5%

R923

6.2K ±5%

C926

0.1UF/50V

C922
2200PF/50V

+

E903

6.8UF/35V

C924

0.01UF/50V

R940
330K ±5%

R959

2.2/1W

C921
1UF/50V

+

E902

22UF/50V

C923
2200PF/50V

+

E906

220UF/25V

R931
330K ±5%

C919
100PF/50V

R966

4.75K ±5%

R949
10K ±5%

C925
1UF/50V

C920

4700PF/50V

D913
MBRS140T3

1 2

R962

22K ±5%

Q901

BCX56-16

3

2 1

R961

18.2K ±5%

R930
22 ±5%

R964
110 ±5%

R941
10K ±5%

Q905

SPW20N60S5

2

1 3

R905
1M ±5% 1206

R937
22 ±5%

R946

18K ±5%

R911
360K ±5%

R906
1M ±5% 1206

R933

4.75K ±5%

R913
680 ±5%

F901

T5A/250V

R918
360K ±5%

T901
CH4162-C

10 8

9

6

7

1

25

4

R939
330K ±5%

R907
1M ±5% 1206

R916

4.75K ±5%

R953

22K ±5%

C906
1000PF/4KV

R926
360K ±5%

C902
1000PF/4KV

D901
1N5406RL

1 2

Q902
BCX53-16

1 2

3

R960
22 ±5%

R908

0.22/1W

+

E908

220UF/25V

R935
360K ±5%

D905

GBU806

2

1

3

4

AC

V+

AC

V-

R909

0.22/1W

R901
SCK2R55A

21

IC904
PC817A

1

23

4

R942
360K ±5%

R944
330K ±5%

R951
1K ±5% 1206

C971
1UF/50V

D912

1N4746A-18V

1 2

+

E905

6.8UF/35V

R952
1K ±5% 1206

IC903
ICE2A180

1

2

3

4 5

6

7

8

SoftSFBIsense

Drain Drain

N.C

VCC

GND

+

E901

150UF/450V

R950
82K ±5%

R947
56K ±5%

R922

6.2K ±5%

R924
68K ±5%

C903

0.47UF/275V

R919
360K ±5%

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

BCX53-16

TOP

123

BCE

BCX56-16

HS9001

HS9001

1

23

46

5

KAS200-5S242212

A0

MAIN 24V

LC-32U5 POWER SUPPLY BOARD

A3

33Friday, March 25, 2005

Title

Size Document Number Rev

Date: Sheet

of

VCC1_1

24V_2

12V_1

12V

24V_1

A

B

B

A

A

B

D

24V

12V_2

24V

VCC1_12

ON_OFF 2

PFC2

D1 2

D1 2

STD-5V

STD-5V

STD-5V

CN904

TJC3-7

1

2

3

4

5

6

7

ON_OFF

RTN

STD-5V

RTN

RTN

12V

12V

R531
1K ±5% 1206

R513
10K ±5%

D935

1N4749A-24V

R514
1K ±5%

R540
13K ±5%

R553

10 ±5% 1206

IC913
UC3845

1

2

3

4

5

6

7

8

COMP

VFB

ISENSE

RT/CT

GROUND

OUTPUT

VI

VREF

R544
27K ±5%

HS901
LHS-80

1

R995

10K ±5%

A

TP

1

1

R539

2.2K ±5%

R530
1K ±5%

C966

0.1UF/50V

HS902
LHS-80

1

C962

0.22UF/50V

HS903
LHS-35

1

+

E914

680UF/25V

IC912
PC817A

1

2 3

4

R504
510 ±5% 1206

D926
MBR20150CT

2

1

3

D928

MURS160T3

1 2

R522

5.6K ±5% 1206

C965

1000PF/50V

C968

1UF/50V

L907
KH32XH-L907

63

1

2 4

5

R548

1.2K ±5%

R502

220/1W

C945

1UF/50V 1206

C959
100PF/50V

C963

1000PF/50V

R510 3.6K ±5%

HS503
LHS-80

1

D925

1N4733A-5.1V

R996

1K ±5%

C946
100PF/2KV

C951

1UF/50V 1206

C950

1UF/50V

R542

33K ±5%

C953
1UF/50V 1206

R508

220/1W

C948

1UF/50V

R528

0.5/1W

R515
10K ±5%

R525

1K ±5%

R991

510/5W

R526

10K ±5%

R984 10K ±5%

+

E916

680UF/25V

+

E921

680UF/35V

C960

1UF/50V

D924

MURS160T3

1 2

L909
LBG-1R7

12

R511 3.6K ±5%

L908
LBG-1R7

12

+

E919

680UF/35V

D922
MBR20100CT

2

1

3

+

E920

680UF/35V

R999
220 ±5% 1206

R538

1K ±5%

R523

4.7 ±5%

C958

1UF/50V

R505
510 ±5% 1206

Q906

SPP11N60C2

2

13

R501

0.1/1W

R552

220 ±5% 1206

C955

0.01UF/50V

+

E915

680UF/25V

C930

0.1UF/630V

C938

1UF/50V

R533
2K ±5%

IC909
PC817A

1

2 3

4

D931

1N4743A-13V

Q907

SPP11N60C2

2

1 3

C937

100PF/50V 1206

R989

3.6K ±5%

IC911
PC817A

1

2 3

4

C944

1UF/50V 1206

C970

2.2UF/63V

C936

0.22UF/50V 1206

R998
220 ±5% 1206

C941

1UF/50V

IC914
PC817A

1

2 3

4

D919
MBR20100CT

2

1

3

D933
LL4148

12

C969

2.2UF/63V

R551

220 ±5% 1206

HS502
LHS-80

1

R997

220 ±5% 1206

R512
360 ±5%

R987

220 ±5% 1206

D932

1N4746A-18V

1 2

C942

4700PF/250V

IC916
TL431ACLP

2 3

1

CN903

TJC3-2

1

2

RTN

12V

C940

1UF/50V

C949

0.22UF/50V 1206

R543

2.4K ±5%

+

E918

22UF/50V

C964

1000PF/50V

R516
10 ±5%

R536
1K ±5%

D934
LL4148

12

D927
MBR20150CT

2

1

3

R529

8.2K ±5%

R518

2.2K ±5%

D917 1N4746A-18V

1 2

R547
2K ±5%

R521

5.6K ±5% 1206

T902
KH32XH-T902

7
5

4

12

9

10

11

6

3

1

2

8

C939

0.1UF/50V

R520

5.6K ±5% 1206

+

-

IC910A
LM2904

3
2

1

84

+

-

IC915B

LM2904

5
6

7

84

R537

20K ±5%

R546
10K ±5%

C967

0.1UF/50V

C943
100PF/50V 1206

R982

4.7 ±5%

+

-

IC915A
LM2904

3
2

1

84

D929

MURS160T3

1 2

R545

1.2K ±5%

C947

0.1UF/50V

R509
10K ±5%

+

-

IC908A
LM2904

3
2

1

84

CN902

TJC3-4

1
2
3
4

24V

24V
RTN
RTN

C957

1UF/50V

R988
11K ±5%

C954

0.1UF/50V

R993

360 ±5%

R503

0.1/1W

R527

2.2/1W

R541
360 ±5%

R517 0.1/1W

C952

1UF/50V

CN905

TJC3-8

1
2
3
4
5
6
7
8

24V
24V
24V

24V
RTN
RTN
RTN
RTN

F902

T3.15A/250V MRT1

R519 0.1/1W

R532

6.2K ±5%

T903

JCBD19-23

4

5 1

7

R992

10K ±5%

D921 LL4148

1 2

R524 0.1/1W

R535

1.3K ±5%

R986 10K ±5%

R994

3.6K ±5%

R534
27K ±5%

HS501
LHS-80

1

L?
?

12

C956

0.1UF/50V

C961

0.1UF/50V

LCD-S.M.-U#_Ver.1.0