Toshiba 27WL55A Administrator Guide

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.
MODEL : 27WL55A / 27WL55E / 27WL55R / 27WL55T
SCHEMATIC DIAGRAM
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 this
model. Do not degrade the safety of the receiver through improper servicing.

SCHEMATIC DIAGRAM STRUCTURE:
CONNECTOR ..................................................................................................................................................... 1/49
AV_JACK ............................................................................................................................................................ 2/49
TIF ....................................................................................................................................................................... 3/49
AUDIO_OUT ....................................................................................................................................................... 4/49
REGULATOR ...................................................................................................................................................... 5/49
KEY ..................................................................................................................................................................... 6/49
PC-IN_BOARD ................................................................................................................................................... 7/49
LED_RMT_HP .................................................................................................................................................... 8/49
TEXT_SW ........................................................................................................................................................... 9/49
CONNECTOR(POWER_BOARD) .................................................................................................................... 10/49
MAIN_POWER(POWER_BOARD) ................................................................................................................... 11/49
SUB_POWER(POWER_BOARD) .................................................................................................................... 12/49
AC-INPUT ......................................................................................................................................................... 13/49
SIGNAL ANALOG IN [SHEET-200] ...... 14/49
D IN A [SHEET-300] ...... 15/49
D IN B [SHEET-301] ...... 16/49
HDMI (Link, I2C) [SHEET-302] ...... 17/49
HDMI Rx#2 (Video/Audio) [SHEET-303] ...... 18/49
HDMI Rx#3 (PWR,Audio) [SHEET-304] ...... 19/49
HDMI AUDIO PLL [SHEET-305] ...... 20/49
HDMI AUDIO DAC [SHEET-306] ...... 21/49
HDMI AUDIO OUT [SHEET-307] ...... 22/49
HDMI CONTROLLER [SHEET-308] ...... 23/49
EEPROM1 [SHEET-309] ...... 24/49
EEPROM2 [SHEET-310] ...... 25/49
MICRO I/O [SHEET-400] ...... 26/49
OCM MEMORY I/F [SHEET-401] ...... 27/49
FLASH MEMORY [SHEET-402] ...... 28/49
SYNC SEPA [SHEET-403] ...... 29/49
E2P OTHER [SHEET-404] ...... 30/49
STD-BY MICOR [SHEET-405] ...... 31/49
CORTEZ REG 1 [SHEET-406] ...... 32/49
CORTEZ REG 2 [SHEET-407] ...... 33/49
CORTEZ REG 3 [SHEET-408] ...... 34/49
BOOT CONFIG [SHEET-409] ...... 35/49
SERVICE CONNECTOR [SHEET-410] ...... 36/49
I2C Switch [SHEET-411] ...... 37/49
AUDIO (1/2) [SHEET-600] ...... 38/49
(2/2) [SHEET-601] ...... 39/49
CORTEZ 1 [SHEET-700] ...... 40/49
CORTEZ 2 [SHEET-701] ...... 41/49
DDR I/F [SHEET-702] ...... 42/49
DDR SDRAM [SHEET-703] ...... 43/49
DDR TERMINATION [SHEET-704] ...... 44/49
DCDC CONV. [SHEET-802] ...... 45/49
LVDS OUT [SHEET-900] ...... 46/49
LVDS OUT(SHARP LCD) [SHEET-901] ...... 47/49
Power Connector and Dimming [SHEET-902] ...... 48/49
LVDS Power and Others [SHEET-903] ...... 49/49

UART
Non
YCbCr 16bit
656
HDMI
Analog
Front
End
(16port)
Video
Decoder
MUX
VBI Data
Processor
DCDi
MADi
Scaling
BEP LVD
S
OSD
Micro-
processor
IR I/F
Digital
Input A
Digital
Input B
2nd
Channel
Process
STAND-BY
MICRO
DDR SDRAM
IO EXP
DDR SDRAM
I2C
MSP
SIGNAL BOARD
I2C
PC IN
POWER BOARD AC INPUT
Audio out
AV BOARD
TIF
EXT in
GPIO
AD
I2C
PANEL
CORTEZ
FLASH
ROM
EEPROM
PANEL I/F
FLI8532
CIRCUIT BLOCK DIAGRAM

(1/49)
27WL55A/E/R/T
CONNECTOR

(2/49)
27WL55A/E/R/T
AV_JACK

(3/49)
TIF Type : Horizontal
VIDEO out (US- NC) IF out 32V SIF out Audio det out AFT SDA SCL NC(US- IF out) RF AGC VT NC(Asia-SW2)
NC(Asia-SW1)
171511 131235642 81097 14 16
NC NC 5V
L101
C104
Q162
R164
D101
L102
L103 Q161
R161
R169
R166
C161
GR02
L105
GR03
L110
GR01
C102
R108 R107
C105
Q101
R104
R105
R103
R162
C163
R163
R165
PK05
C164
R168
C113
C115
C114
C112
C116
C110
C111
C101
P516A
H001
GR112GR612
C103
R114
GR113
GR613
C190
L191
C107
R102
R101
R167
R170
C162
RV44
RV43
CC04
GV02
QV06
RV60
LV42
GV01 CB41
CV39
CV42
GR05
GR07
C117
GR06
GR08
C118
COLTLN3278D
50V4.7
KETSU
KETSU
KETSU
TEM2121M
TEM2121M
KETSU
KETSU
RM73B1HR00OD
KETSU
KETSU
RM73B1HR00OD
KETSU
RM73B1HR00OD
KETSU
RM73B1HR00OD
16V220
RM73B1HR00OD RM73B1HR00OD
16V220
2SC4081-Q
10k
27K
100
KETSU
KETSU
KETSU
KETSU
KETSU
0.01
KETSU
KETSU
KETSU
KETSU
KETSU
KETSU
B1000p
B1000p
B25V0.01
KETSU
ENG39A07GF
KETSUKETSU
B1000p
RM73B1HR00OD
KETSU
KETSU
0.1uF
TEM2121M
KETSU
100
100
100
100p
OPEN
100
OPEN
OPEN
2SA1576A
1k
OPEN
RM73B1HR00OD OPEN
16V100
OPEN
RM73B1HR00OD
KETSU
B25V0.01
RM73B1HR00OD
KETSU
B25V0.01
+
+
+
+
+
(23103272Q)
tuner_GND tuner_GND
TP-12
TUNER-GND
105 C
105 C
SIF OUT
D/K L L
B/G H L
ILH
SW1 SW2
MHH
32V
32V
AFT1
GND
SDA1SCL1
SCL1
SDA1
_SW2
GND
SYS_SW2
SYS_SW1
11-A2
1-B2,2-A1,3-C2,8-E1
1-B2,2-A1,3-C2,8-E1
1-A6
1-B6,2-A1,9-A1
11-A1
3-A2
1-C2
2-B1
1-B5,10-B1
TT_FL_OUT
GND
SCL1
SDA1
GND
32V
5V2
GND
GND
V_TN_OUT
GND
SIF
AFT1
GND
V_TV1
9V
GND
SYS_SW2
SYS_SW1
( H: 5V, L: 0V)
4.86
1.5V (RECEIVING THE SIGNAL)
2.9V (NO SIGTNAL)
32.6
27WL55A/E/R/T
TIF

(4/49)
NC
NC
MUTE TC
OUT(R)
OUT(L) MUTE IN(R)
135 8 712 911
10
642
GND VCC GND FILTER IN (L)
GR600
C6990
R683
C671
C670
C663
C662
R671
R670
C661
C660
C675
C674
D677
D676
D679
D678
C677
GR661
Q671
Q672
R680
R681
C685
R685 C676C690
Q662
C692
C667 R677
C691
C693
R682
Q673
R686
R684
R6603
R6602
Q663
R6601
R675 R673
C665
Q670
R6604
C666
R674
R672
C664
R676
D675
C684
C8001
C680
D671
C678
R678
R679
C679
C682
C681
C673
D670
D674
Q670A
OPEN
7L50V0.47
22k
50V10
50V10
B680p
B680p
4.7k
4.7k
50V4.7
50V4.7
50V3.3u
50V1.0
KDS160-RTK/P
KDS160-RTK/P
KDS160-RTK/P
KDS160-RTK/P
OPEN
22k
2SC3326-B(TE85,F)
2SC3326-B(TE85,F)
10k
10k
B50V0.01
18k 50V100uKETSU
RN2404(TE85L,F)
OPEN
OPEN OPEN
OPEN
OPEN
100k
2SA1162-Y
1k
100k
100k
10k
2SC4081-Q
22k
OPEN
1.8k
OPEN
TA8246AHQ
1k
OPEN
OPEN
1.8k
OPEN
OPEN
MA111
B25V0.01
35V1000
35V1000
MA111
63V0.10
1/8W 2.2
1/8W 2.2
63V0.10
35V1000
35V1000
25V47
MA111 MA111
HEAT SINK
+
++
++
+
+
+
++
M
M
M
M++
MM
++
+
VCC_GND
L/R
TO POWER/DEF
L_APRO
R_APRO
MUTE
18V
VCC_AUDIO
A_MUTE
EXT_MUTE
GND_AUDIO
GND_AUDIO
GND_AUDIO
R_OUT
L_OUT
26.5V_AUDIO
1-D8,5-A1,5-A2
1-D8
1-B7
1-B7
1-B6
1-B6
1-D7,1-D7,1-D8,4-A2,4-B2
1-D7
1-D7,1-D7,1-D8,4-A2,4-A2
1-D7
1-D8
1-D7,1-D7,1-D8,4-A2,4-B2
18V
VCC_AUDIO
5V1
A_MUTE
EXT_MUTE
MUTE
L_APRO
GND
GND
R_APRO
GND_AUDIO
R_OUT
GND_AUDIO
L_OUT
26.5V_AUDIO
GND_AUDIO
13.25 26.5 13.2
27WL55A/E/R/T
AUDIO_OUT

(5/49)
P
P
DE98
DE97
RE91
QE98
ZE94
DE99
QE94B
RE97
QE90B
QE90A
QE91B
RE94
DE95
RE85
QE91
ZE90
RE90
QE90
QE94A
QE94
CE90 DE90
CE91
CE92
DE91
CE93
QE91A
QE97
RE95
CE87
RE87
RE84
QE95
RE88
QE96
RE93 DE93
DE94RE98
RE96 DE92
MTZJ13C
MTZJ13C
10k
2SA1163-GR
125V 2A
1SS355-TE17
1R680
OPEN
1/8W270
KETSU
KETSU
KETSU
KETSU
KETSU
KIA7809API
HEAT SINK
2SD2396/2SC3852
63V0.33 MTZJ12C
63V0.10
16V100
KETSU
KETSU
KETSU
2SC2713-GR
1R1.2k
50V10
47k
1.5k
2SC2412K
10k
2SA1887(FA,F)
22k MTZJ11B
MTZJ11B
100k
47k MTZJ11B
MM
+
+
+
215mA
180mA
25mA
205mA
From SUB_POWER
15mA 5mA 40V 32V
18V 18V1
GND
1-D8,4-B1,5-A1
1-D8,4-B1,5-A2
4-A2
1-D4,1-D6,5-A1 1-B1
1-D5,1-D6
1-D8 1-D6,3-B1
1-D8 1-D4,1-D6,5-A2
1-D7
VCC_AUDIO
GND_AUDIO
VCC_AUDIO 26.5V_AUDIO
18V1 9V
12V_FAN
GND
40V 32V
18V 18V1
POWER_SW
27WL55A/E/R/T
REGULATOR

(6/49)
DA06
DA01 DA07
PJ42A
RA72 RA73
RA77 RA78
RA71
SA02
SA01
SA04
SA03
SA05
SA06
RA79
RA74
SA07
UDZSTE176.8B
UDZSTE176.8B UDZSTE176.8B
PLUG_2mm_6P_L\S6B-PH-K-S
22k 10k
10k CHIP JP
68k
PUSH SW 1C1P DC12V 005A PUSH SW 1C1P DC12V 005A PUSH SW 1C1P DC12V 005A PUSH SW 1C1P DC12V 005A PUSH SW 1C1P DC12V 005A PUSH SW 1C1P DC12V 005A
CHIP JP
CHIP JP
PUSH SW 1C1P DC12V 005A
CH-DOWN
5
KEY_FGND
6
POWER_KEY
3
ADC_IN1 NC
12
ADC_IN2
4
GND
CH-UP VOL-DOWN
HOUSOU
VIDEO VOL-UP
27WL55A/E/R/T
KEY

(7/49)
C1-in
AFC-fil
Fsc-out
Comb SYS
CVBS2/Y2-in
C2-in
ADDRESS
CVBS3/Y3-in
APC-fil
C3-in
X'tal
fil
YS2/YM
R2-in G2-in B2-in
Y/C-VCC
Y2-in
Cb2-in Cr2-in
Y/C-GND
R1-in
G1-in B1-in
YS1
cr-out
cb-out
Y-out
CLP-fil
Y1-in
Cb1-in
Cr1-in
Sync-GND
YS3
SDA SCL Sync-VCC
38 37 3334 32 3136 35 26 252830 29 27
24
18
20
19
15
17
16
23
22
21
14
13
Yvi-out SCP HS Digital-GND Sync-in CVBS-out Comb Y-in Digital-VDD Comb C-in /Forced-S VS CVBS1/Y_in
48
47
46
45
44
43
42
41
40
39
121110987654321
Q501
C519
R505
C506
C505
R508
C503
C504
R502
R504
R506
C526
R515
R507
Q504
C521
R514
R516
R509
GJ10
C517
C527
CC20
L510
R512
R511
GR34
PV90
GR35
GJ16
GJ13
C501
L504
R501
C507
C502
RR05 DR02
DR01
RR06
DR04 DR05
DR03
RR02
RR01
RR03
RR04
P900A
P902A
C516 C524
CC31
X501
GC20
C514
L505
4.7u
100
B0.01
16V47u
6.8k
16V47u
B25V0.01
2.7k
100
27k
B0.01
47k
3.9k
2SA1576A
B0.022
1k
47k
15k
OPEN
7L_0.47u
2.2u
OPEN
OPEN
100
OPEN
SHORT
KRD-8622
SHORT
SHORT
SHORT
B0.1
TRF4100AJ
6.8k
OPEN
B0.1
33 OPEN
OPEN
33
OPEN OPEN
OPEN
1/8W75
1/8W75
1/8W75
33
B9B-PH-K-S
B5B-PH-K-S
CH11 B0.01
B1000
16.2MHz
CHIP JP
16V220u
TRF4100AT
+
++
++
+
A
PC-DSUB
V
GND RG
VOUT
H
SCL1
SDA1
GND
5V2
GND VGND GNDB
5649 21453 78132
H
GND GND
BGR
GND
AV-Y
GND
GND
GND
GND
27WL55A/E/R/T
PC-IN_BOARD