Sharp LC-37XD1RU User manual

For this model, the LCD panel module and digital tuner unit have been changed.
Since the LCD panel module has been changed, the design, main unit and digital unit have also been changed.
When servicing the product, use this manual with the service manual LC-37XD1E (S06X6LC37XD1E) already issued.
The previous LCD panel models and the new model can be identified with the following markings.
•The B character is added at the end of the model name on the model label.
•The B character is also added at the end of the model name on the number label (barcode label) of the
packing case.
•The serial product numbers (in the 5th thru 9th digits) are 51112 and on.
Items described in this manual
Adjustment items, Troubleshooting, Major IC informations, Block diagram, Printed Wiring Board, Schematic Diagram.
MODIFIED PARTS
MODIFIED PARTS..............................................i
CHAPTER 1. ADJUSTMENT PROCEDURE
[1] ADJUSTMENT PROCEDURE ....................... 1-1
CHAPTER 2. TROUBLESHOOTING TABLE
[1] TROBLESHOOTING TABLE ......................... 2-1
CHAPTER 3. MAJOR IC INFORMATIONS
[1] MAJOR IC INFORMATIONS.......................... 3-1
CHAPTER 4. BLOCK DIAGRAM/WIRING DIAGRAM
[1] BLOCK DIAGRAM ......................................... 4-1
[2] POWER BLOCK DIAGRAM ..........................4-3
[3] WIRING DIAGRAM .......................................4-5
CHAPTER 5. PRINTED WIRING BOARD
[1] DIGITAL TUNER UNIT PRINTED WIRING
BOARD..........................................................5-1
CHAPTER 6. SCHEMATIC DIAGRAM
[1] DESCRIPTION OF SCHEMATIC DIA-
GRAM............................................................6-1
[2] SCHEMATIC DIAGRAM ................................6-2
Parts Guide
SERVICE MANUAL
CONTENTS
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the
safety and performance of the set.
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its orig-
inal condition and only parts identical to those specified should be used.
LC-37XD1E/RU SUPPLEMENT
No. S47E1LC37XD1E
LCD COLOUR TELEVISION
LC-37XD1E/RU
MODELS
SUPPLEMENT
OUTLINE

LC-37XD1E/RU SUPPLEMENT
i
LC-37XD1E Service Manual
MODIFIED PARTS
MODIFIED PARTS
Ref No. Parts Name/Description After changing the Digi-
tal Tuner unit
Before changing the Digital
Tuner unit
Remark
PRINTED WIRING BOARD ASSEMBLIES (NOT REPLACEMENT ITEM)
N AV Unit DUNTKD604FM21 DUNTKD604FM21 No Change
N Digital Unit DUNTKD628FM19 DUNTKD628FM12 Change
N Power Unit DUNTKD787FM02 DUNTKD787FM02 No Change
N Digital Tuner Unit DUNTKD984WE02 DUNTKD833WE06 Change
N R/C LED Unit DUNTKD909FM05 DUNTKD909FM05 No Change
N KEY Unit DUNTKD910FM01 DUNTKD910FM01 No Change
N Main Unit DUNTKD915FM09 DUNTKD915FM07 Change
LCD PANEL AND TUNER (NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDENTLY.)
N 37" Full-HD LCD Panel Module R1LK370D3LZ2AX R1LK370D3LZ1AY Change
TU201 Hybrid Tuner RTUNQA035WJZZ RTUNQA034WJZZ Change
DIGITAL Unit
IC4203 IC M29W160ET70N6E RH-IXC100WJZZQ RH-IXB921WJZZQ Change
IC4401 IC TC74LCX245FT(EKJ) VHILCX245FT-1Y VHITCLCX245-2Y Change
N Connector QCNCMA225WJSA QCNCMA199WJSA Change
MAIN Unit
IC1905 IC SII9025CTU VHISII9025+-1Q VHISII9023+-1Q Change
P1702 - QPLGN1075TAZZY Delete
P3001 Plug 5pin (D) QPLGNA339WJZZY - Add.
Q3002 Transistor SSM3K15FS(TE85L,F) VSSSM3K15FS-1Y - Add.
Q3005 Transistor SSM3K15FS(TE85L,F) VSSSM3K15FS-1Y - Add.
R1714 - VRS-CY1JF000JY Delete
R1841 - VRS-CY1JF000JY Delete
R1855 - VRS-CY1JF000JY Delete
R1862 Resistor 100 1/16W Metal Oxide VRS-CY1JF101JY - Add.
R1943 - VRS-CY1JF000JY Delete
R1944 - VRS-CY1JF000JY Delete
R2367 - VRS-CY1JF000JY Delete
R2370 - VRS-CY1JF000JY Delete
R2373 - VRS-CY1JF000JY Delete
R2375 - VRS-CY1JF000JY Delete
R2377 - VRS-CY1JF000JY Delete
R2378 - VRS-CY1JF000JY Delete
R2379 - VRS-CY1JF000JY Delete
R2387 - VRS-CY1JF000JY Delete
R2388 - VRS-CY1JF000JY Delete
R2389 - VRS-CY1JF000JY Delete
R2390 - VRS-CY1JF000JY Delete
R2391 - VRS-CY1JF000JY Delete
R2392 - VRS-CY1JF000JY Delete
R2393 - VRS-CY1JF000JY Delete
R2394 - VRS-CY1JF000JY Delete
R2395 - VRS-CY1JF000JY Delete
R2398 - VRS-CY1JF000JY Delete
R2718 - VRS-CY1JF000JY Delete
R2722 - VRS-CY1JF000JY Delete
R2723 - VRS-CY1JF000JY Delete
R2724 - VRS-CY1JF000JY Delete
R2725 - VRS-CY1JF000JY Delete
R2727 - VRS-CY1JF000JY Delete
R2728 - VRS-CY1JF000JY Delete
R2729 - VRS-CY1JF000JY Delete
R2730 - VRS-CY1JF000JY Delete
R2731 - VRS-CY1JF000JY Delete
R2732 - VRS-CY1JF000JY Delete
R2733 - VRS-CY1JF000JY Delete

LC-37XD1E/RU SUPPLEMENT
ii
R2734 - VRS-CY1JF000JY Delete
R2735 - VRS-CY1JF000JY Delete
R2755 - VRS-CY1JF000JY Delete
R2756 - VRS-CY1JF000JY Delete
R3013 - VRS-CY1JF000JY Delete
R3014 - VRS-CY1JF000JY Delete
R3015 - VRS-CY1JF000JY Delete
R3016 - VRS-CY1JF000JY Delete
R3017 - VRS-CY1JF000JY Delete
R3021 - VRS-CY1JF000JY Delete
R3022 - VRS-CY1JF000JY Delete
R3026 Resistor 100 1/16W Metal Oxide VRS-CJ1JF101JY - Add.
R3034 - VRS-CY1JF000JY Delete
R3054 - VRS-CY1JF000JY Delete
R3066 Resistor 0 1/16W Metal Oxide VRS-CY1JF000JY - Add.
R3067 Resistor 0 1/16W Metal Oxide VRS-CY1JF000JY - Add.
R3561 - VRS-CY1JF000JY Delete
R3596 - VRS-CY1JF000JY Delete
R3712 - VRS-CY1JF000JY Delete
R3713 - VRS-CY1JF000JY Delete
R3714 - VRS-CY1JF000JY Delete
R3715 - VRS-CY1JF000JY Delete
R3741 - VRS-CY1JF000JY Delete
R3752 - VRS-CY1JF000JY Delete
TH3003 - VRS-CY1JF000JY Delete
D-TUNER
Unit Refer to the Parts List.
CABINET
PARTS Refer to the Parts List.
SERVICE
JIGS
N 4-20pins, Power to LCD Controller Unit (PL) QCNW-F046WJQZ QCNW-E599WJQZ
Ref No. Parts Name/Description After changing the Digi-
tal Tuner unit
Before changing the Digital
Tuner unit
Remark

LC-37XD1E/RU SUPPLEMENT
1 – 1
LC-37XD1E Service Manual
CHAPTER 1. ADJUSTMENT PROCEDURE
[1] ADJUSTMENT PROCEDURE
The adjustment values are set to their optimum at the factory before shipping.
If by any chance a value should become improper or a readjustment is required due to part replacement, make an adjustment according to the follow-
ing procedure.
1. After replacement of any PWB and/or IC for repair, note the following.
When replacing the following units, be sure to prepare the new units loaded with updated software.
MAIN-UNIT: DUNTKD915FM09
NOTE: That an IC into which ROM data is written is available for MAIN-UNIT servicing (see below).
IC1901 RH-iXB936WJZZS EDID(HDMI)
IC1902 RH-iXB937WJZZS EDID(HDMI)
IC2303 RH-iXB938WJZZS EDID(PC)
2. Software Upgrade
• Software service extension cable QCNWGA015WJPZ
3. Remote controller key operation and description of display in adjustment process mode.
• Description of display.
(3) Current page item
(1) Current page title
[INIT]
[
PAL+TUNERMAIN
]
[COMP] [SCART RGB] [TUNER]
Dev Version
Center Acutime
Backlight Acutime
XX
Temp Sensor
[5]
(2) Parameters
37XD1B ver. 2.31 (XX/XX)
Error Standby Cause [1]
XX
XX
XX
XX
XX
XX
Dev Loader Version
Normal Standby Cause
Main Version

LC-37XD1E/RU SUPPLEMENT
1 – 2
4. Adjustment process mode menu
The character string in brackets [ ] will appear as a page title in the adjustment process menu header.
5. Video signal adjustment procedure * The adjustment process mode menu is listed in Section 5.
1. Signal check
Signal generator level adjustment check (Adjustment to the specified level)
• Composite signal PAL : 0.7Vp-p ±0.02Vp-p (Pedestal to white level)
• 15K component signal : Y level 0.7Vp-p ±0.02Vp-p (Pedestal to white level)
(50 Hz) PB, PR level 0.7Vp-p ±0.02Vp-p
2. Entering the adjustment process mode
Enter the adjustment process mode according to Section 3.
3. RF AGC adjustment 1
Page Line
1/13 [INFO]
1 Main Version
37XD1B ver 2.31 2007.03.15
Main microprocessor version
2 Dev Version ver 1.151 DTV version.
3 Dev Loader Version 2.7 DTV Loader Version
4 Center Acutime xxxxH xxM Main operating hours
5 Backlight Acutime xxxxH xxM Backlight operating hours
6 Temp Sensor 080 Temp Sensor setting
7 Normal Standby Cause 1 RC_STANDBY
8 Error Standby Cause [1]
1c POWER ERROR 0000H 00M
Error standby cause Total operating time before error
[2]
1c POWER ERROR 0000H 00M
[3]
1c POWER ERROR 0000H 00M
[4]
0 0000H 00M
[5]
0 0000H 00M
2/13 [INIT]
1 FACTORY INIT
EURO/UK/ITALY/FRANCE/RUSSIA
Initialization to factory settings execution
2 INCH SETTING Inch Setting
3 PUBLIC MODE off/on HOTEL MODE㵘flag setting
4 Center Acutime Reset off/on Main operating hours Reset
5 Backlight Acutime Reset off/on Backlight operating hours Reset
6 Picture Read Pos X 670 x-axis setting of picture data
7 Picture Read Pos Y 419 y-axis setting of picture data
8 Picture Read Signal Type PAL/COMP/HDMI/RGB Signal Type Setting
9 Picture Read 0 - 1023 Start/stop of picture data
Item Remarks (adjustment detail,etc.)
Description
1 Setting [Signal] 䊶
Feed the PAL Split Field colour bar signal (E-12ch) to TUNER.
PAL 㵘Signal level: 65dB V㵘±1dB 㵘㵘(75 ΩLOAD)
Split Field Colour Bar
RF signal UV [E-12CH]
[Terminal]
TUNER
㸡100% white
2
Auto adjustment Adjustment process Bring the cursor on [ RF AGC BG ADJ] and press [OK]
performance Page 3 [ RF AGC BG ADJ 㵘OK] appears when finished.
Adjustment Conditions Adjustment㵘procedure Adjustment poin t

LC-37XD1E/RU SUPPLEMENT
1 – 3
4. Tuner adjustment
6. Initialization to factory settings
1 Setting [Signal]
PAL
PAL split colour bar
䊶Feed the PAL Split Colour Bar (E-12ch) to TUNER.
RF signal
䊶Make sure㵘the PAL colour bar pattern (E-12) has㩷the sync level of
㵘7:3 with the picture level.
[Terminal]
TUNER
㸡100% white
2Auto adjustment Adjustment process Bring the cursor on [ TUNER ADJ] and press [OK].
performance Page3. [TUNER ADJ OK] appears when finished.
Adjustment point Adjustment conditions
䈀E-12CH䈁
Adjustment procedure
Caution: When the factory settings have been made, all user setting data, including the channel settings, are
initialized. (The adjustments done in the adjustment process mode are not initialized.) Keep this in
mind when initializing these settings.
1 Factory settings [Factory setting with adjustment process mode]
䊶Enter the adjustment process mode.
(See to below caution) 䊶Move the cursor to [Factory Init] on page 2/13.
䊶Use the R/C 㵘㵘key to select a region from
[EURO/UK/ITALY/FRANCE/RUSSIA] and press the [OK]㵘key.
䊶“EXECUTING” display appears .
䊶After a while, "OK" display appears, the setting is completed.
[Factory setting with R/C key]
䊶Enter the adjustment process mode.
䊶Push a remote controller code of each destination. (See below )
䊶It automatically becomes in the process adjustment menu (INIT)
and change FACTORY INIT becomes "EXECUTING" display.
䊶After a while, "OK" display appears, the setting is completed.
destination R/C code
37XD1K 䊶䊶䊶䊶䊶A8(Hex)
37XD1I 䊶䊶䊶䊶䊶E8(Hex)
37XD1F 䊶䊶䊶䊶䊶E9(Hex)
37XD1R䊶䊶䊶䊶䊶EB(Hex)
37XD1E 䊶䊶䊶䊶䊶FE(Hex)
The following items are initialized in the factory setting.
1. User settings
2. Channel data (e.g. broadcast frequencies)
3. Maker option setting
4. Password data
After adjustments, exit the adjustment process mode.
To exit the adjustment process mode, turn off the MAIN power key.
When the power is turned off with the remoto control, unpulug the AC power cord and plug it back in.
ends by turning off the
MAIN POWER key.
Adjustment item Adjustment conditions Adjustment procedure

LC-37XD1E/RU SUPPLEMENT
2 – 1
LC-37XD1E Service Manual
CHAPTER 2. TROUBLESHOOTING TABLE
[1] TROBLESHOOTING TABLE
No sound (1) (during the reception of TV broadcasting)
No audio output during UHF/VHF reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control ? ... Set the desired volume.
2) Are headphones connected to HEADPHONE (J1301 ) ? ... Disconnect them.
3) Is ANT-CABLE disconnected or connected improperly ? ... Connect it correctly as per the operation manual.
Is the audio signal (L/R)
sent from pins (28) and
(27) of IC3701 (MSP)?
NO
Is the SIF signal
(ANA_IN1+) sent to pin
(67) of IC3701(MSP)?
YES Check whether +5V and
+8V are supplied to pins
(12) and (39) of IC3701
respectively. Or, check
peripheral circuits.
(AV-UNIT) YES NO
Is the audio signal of pins
(3) and (5) of IC303 (OP-
AMP) sent properly?
NO Check SC2704
and P1201 or
peripheral circuits.
Is the S-MUTE sig-
nal “L”?
Is the audio signal (SIF)
sent from pin (1) of CON-
NECTOR (SC2705)?
YES Check pin (67) of IC3701
(MSP) and peripheral cir-
cuits.
YES (TUNER) NO
Is the audio signal of pin
(4) of IC301/IC302
(AUDIO-AMP) sent prop-
erly?
NO Check HEAD-
PHONE
(J1301) or periph-
eral circuits.
Is the audio signal (SIF)
sent from pin (12) of
IC201?
YES Check CONNEC-
TOR(P201) and periph-
eral circuits.
YES NO
Is the audio signal output
of pins (2) and (4) of P301
(AUDIO-CONNECTOR)
normal?
NO Check P301
(AUDIO- CON-
NECTOR) and
peripheral circuits.
Is the SIF signal sent to
pins (23) and (24) of
IC201?
YES Confirm whether +5V is
supplied to pin (20) of
IC201. Or, please check
the peripheral circuit.
YES NO
Check SP-BOX (right and
left) and wire harness.
Is the SIF signal sent from
pin (12) of TUNER
(TU201)?
YES Check soldering the ter-
minal
and peripheral circuits.
NO
Check whether 5V
(CONT) and 5V are sup-
plied to pins (1) and (2) of
TUNER (TU201) respec-
tively. Check SDA/SCL
and AGC signal.
YES Replace TUNER
(TU201).

LC-37XD1E/RU SUPPLEMENT
2 – 2
No sound except from speakers (3) -1
No audio output from the
headphones.
No audio output from
EXT1 (SCART) terminal.
Is there audio output on pins
(2) and (3) of the headphone
terminal (J1301)?
Checklist:
1) Is the MUTE button on the remote control set to ON? ... Set to OFF.
2) Check the connection to external devices....Is there any improper connection?
3) ls S-MUTE-LINE [IC1710 (pin 92)] at H?....It is defective. Check the IC1710.
NO
Is audio input/output signal of
pins (3) and (5)/(1) and (7) of
IC303 (OP-AMP) normal?
Is audio signal sent to pins
(3) and (1) of EXT1
(J1101)?
NO ls S-MUTE-LINE
[IC1710 (pin 92)] at H?
(Check Q1106/Q1105
operation.)
NO YES NO
Is audio output signal (SPK-
OUT L/R) properly sent from
pins (28) and (27) of IC3701
(MSP)?
Check the connection to
EXT1 (J1101) and exter-
nal devices.
Is audio signal sent
from pins (33) and (34)
of IC3701?
NO Check the power supply
8/5 V pins (39) and (12)
of IC3701 and periph-
eral circuits.
NO YES
Check audio input signal of pin
(67) of IC3701(MSP), pins
(39) and (12) of the power
line5 and 8V, pins (3) and (2)
of I2C-LINE, and peripheral
circuits.
Check the audio signal
output line from pins
(33) and (34) of IC3701
to pins (3) and (1) of
EXT1.

LC-37XD1E/RU SUPPLEMENT
2 – 3
No sound except from speakers (3) -2
No audio output from
EXT2 (SCART) termi-
nal.
No audio output from
AUDIO OUTPUT termi-
nal.
Checklist:
1) Is the MUTE button on the remote control set to ON? ... Set to OFF.
2) Check the connection to external devices....Is there any improper connection?
3) ls S-MUTE-LINE [IC1710 (pin 92)] at H?....It is defective. Check the IC1710.
Is audio signal sent to
pins (24) and (22) of
EXT2 (J1101)?
NO ls S-MUTE-LINE [IC1710
(pin 92)] or S2-MUTE-
LINE [IC1710(pin 90)] at
H?
(Check Q1102/Q1101
operation.)
ls S-MUTE-LINE
[IC1710 (pin 92)] at H?
(Check 1204/Q1203
operation.)
NO
Is audio signal sent to
pins (13) and (15) [L/
R (white) (red)] of
AUDIO OUTPUT termi-
nal (J1201)?
YES NO NO YES
Check the connection to
EXT2 (J1101) and
external devices.
Is audio signal sent from pins (36) and (37) of IC3701? Check the connection
to AUDIO OUTPUT
terminal (J1201) and
external devices.
NO YES
Check the power supply 8/
5 V pins (39) and (12) of
IC3701 and peripheral cir-
cuits.
Check the audio signal
output line from pins
(36) and (37) of IC3701
to Q1103/Q1104/
Q1201/Q1202.

LC-37XD1E/RU SUPPLEMENT
2 – 4
<0n input of the tuner (U/V)> No picture on the display (1)
No picture appears on
LCD during the tuner
(U/V) reception.
Checklist:
1) Is "INPUT SOURCE" button on the remote control set up correctly? ... See the operation manual and set "INPUT SOURCE" to "TV".
2) Is MENU-Picture-Contrast/Brightness set to "MIN" ? ... Set it to an appropriate level.
3) Is ANT-CABLE disconnected or connected improperly? ...Connect it correctly as per the operation manual.
YES
Is level of pins (15) and
(14) of tuner (TU201)
and pins (12) and (2) of
IC204 (MULTI) at H?
NO These are communica-
tions lines for control
(I2C). Follow the path and
check whether they are
forced to
L(PULL_DOWN).
YES
Is the video signal (IF)
sent from pin (17) of
tuner (TU201)?
NO Check the tuner (TU201)
and peripheral circuits.
YES
Is the video signal
CVBS sent to pin
(AC23) of lC3002 (V-
PRO.)?
NO Check CONNECTOR
(P201 /SC2705) and
peripheral circuits.
YES
Is LVDS video signal (TA1±- TD1±) sent to pins (AB8)/(AC8) -
(AB3)/(AC3) of IC3002 (V-PRO.), and is CLK signal (CK1±) sent to
pins (AB5)/(AC5)?
Is LVDS video signal (TA2±- TD2±) sent to pins (AC2)/(AC1) - (V2)/
(V1) of IC3002 (V-PRO.), and is CLK signal (CK2±) sent to pins
(Y2)/(Y1)?
NO Check pins (G14)/(U10) of BU3.3V line of IC3002 (V-PRO.),
pins (G10)/(N17) of BU2.5V line, pins (U16)/(G12) of BU1.8V
line and peripheral circuits.
YES
Is LVDS video signal (TA±- TD1±) sent to pins (3)/(2) -(12)/(11) of
CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK signal (CK1±)
sent to pins (10)/(9)?
Is LVDS video signal (TA2±- TD2±) sent to pins (17)/(16) -(26)/(25)
of CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK signal
(CK2±) sent to pins (24)/(23)?
NO Check CONNECTOR (SC2302, CN1) and HARNESS WIRE
(LV).
YES
Is power (+12V) supplied to pins (1) - (5) of CONNECTOR CN2 in
LCD-CONT-UNIT?
NO Check CONNECTOR (CN2,P707) and HARNESS WIRE
(PL).
YES
Replace LCD-CONT-UNIT.

LC-37XD1E/RU SUPPLEMENT
2 – 5
<During external connection> No picture on the monitor (2) -1
SCART1:
No picture appears on EXT1 -connected monitor during the tuner (U/V)
reception.
SCART2:
No picture from EXT1 appears on EXT2-connected montor.
Note: Normally, if the screen during display is sent to EXT2, no pic-
ture is sent to EXT2.
Checklist:
1) Are input terminal on back of TV and "INPUT SOURCE"button on the remote control set up correctly? ... See the operation manual and
set "INPUT SOURCE "appropriately.
2) Is the Signal Type (item) in MENU-Connection-Input-Select set to the same as that of the external device? ... Set it to "CVBS", "Y/C" or "RGB".
3) Is ANT-CABLE disconnected or connected improperly? ... Connect it correctly as per the operation manual.
4) The picture is sent to the monitor in a CVBS signal if the source during display is TV, CVBS or Y/C of EXT1-3. When sent by component, etc.,
that signal is not sent to the monitor.
5) When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal.
6) The video output from EXT1 is not the monitor output (output of the picture now watching). The picture of the last selected TV channel is
always sent to EXT1. (Specification).
Is video signal sent to
pin (19) of SCART1
(J1101)?
YES Check SCART1, external con-
nection or input setting.
Is video signal sent to
pin (40) of SCART2
(J1101)?
YES Check SCART2, external
connection or input set-
ting.
NO NO
Is video signal (V-
OUT1) sent from pin (2)
of IC1102 (SW)?
YES Check SCART1 (J1101) and
peripheral circuits.
Is video signal (V-
OUT2) sent from pin
(2) of IC1101 (SW)?
YES Check SCART2 (J1101)
and peripheral circuits.
NO NO
Is video signal (V-
OUT1) sent from pin
(Y23) of IC3002 (V-
PRO.)?
YES Check IC1102(SW),Connector
(P1101,SC2702) and
peripheral circuits.
Is video signal (V-
OUT2) sent from pin
(Y20) of IC3002 (V-
PRO.)?
YES Check IC1101(SW), Con-
nector (P1102,SC2703)
and peripheral circuits.
NO NO
Is video signal (CVBS)
sent to pin (AC23) of
lC3002 (V-PRO.)?
YES Check power supply of IC3002
(V-PRO.) and peripheral cir-
cuits.
Is video signal (VIN1)
from EXT1 sent to pin
(AB22) of IC3002 (V-
PRO.)?
YES Check power supply of
IC3002 (V-PRO.) and
peripheral circuits.
NO NO
Is video signal (IF) sent
from pin (17) of tuner
(TU201)?
YES Check CONNEC-
TOR(P201,SC2705) and
peripheral circuits.
Check whether video
signal is sent to pin
(20) of SCART1.
YES Check SCART1, CON-
NECTOR (SC2702,
P1101) and peripheral cir-
cuits.
NO NO
Check 5/5V (CONT) power supply pins (2) and (1), I2C line pins (15)
and (14) of tuner (TU201) and peripheral circuits.
Check SCART1, exter-
nal connection or input
setting.

LC-37XD1E/RU SUPPLEMENT
2 – 6
Backlight failure to light up
Do all the fluorescent tubes light up? NO Check the individual fluorescent
tubes for light-up failure.
YES Replace any defective fluorescent
tube (s) with new one (s).
YES
Is the power supplied to CN7501 on
the inverter unit?
NO Check the connection between power
unit and inverter unit.
YES
Is the Fuse (F7501 or F7701) fuse in
the inverter unit circuit functioning?
NO Replace the blown-out Fuse (F7501
or F7701) fuse on the inverter unit.
Turn on the power again.
If the fuse gets blown out again,
check the short-circuited spot.
YES Check T7501 and T7701 and their
peripheral circuits as IC7501 and
their peripheral circuits.
YES
Is the VCC power supplied to the
control IC (IC7501) on the inverter
unit?
NO Check the circuit connected with the
VCC terminal on the inverter control
IC (IC7501).
YES
Has each control signal come to
CN7502?
(INV-OFL, INV-OSC, INV-STB)
NO Have INV-OFL, INV-OSC and INV-
STB signal come to P1701(LB) in the
MAIN substrate?
NO Check pins (19), (17) and (89) of
IC1710 (main PWB).
YES
Is the specified control signal input-
ted at IC7501 (INV-CTL) on the
inverter unit.
NO Check the line between CN7502 and
IC (IC7501).
YES
Are the Q7501 and Q7502 transistor-
ize at the primary side of T7501 func-
tioning?
NO Check the power line of IC7501, its
peripheral circuits or replace IC7501.
YES
Is the secondary circuit of T7501
functioning.
NO Replace T7501 or the T75*** trans-
former for the fluorescent tubes, or
check their peripheral circuits.

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3 – 1
LC-37XD1E Service Manual
CHAPTER 3. MAJOR IC INFORMATIONS
[1] MAJOR IC INFORMATIONS
1. DESCRIPTION OF MAJOR ICs
REF NO Name Part Code Description Dwg.
Code
IC1905 HDMI-
Receiver
VHISII9025+-1Q The SiI9025 is a second generation panel Link Cinema receiver that is compatible with
the HDMI 1.2 (High Definition Multimedia interface) specification. The SiI9025 is capa-
ble of receiving and outputting two channel digital audio at up to 192KHz - an excellent
solution for Digital TVs. The features of this IC are as follows.
1) Digital video interface supports video processors:
2) Analog RGB and YPbPr output: 10-bit DAC
3) Digital audio interface supports high-end audio systems:
M1
[POWER
SUPPLY
SECTION]
IC705 Switching
Regulator
VHIMR4020++-1 This IC is a power supply for the switching regulator on the primary side,
Overvoltage/overcurrant protection circuit, other protection circuits and control circuits
are built in this IC.
P1
[DIGITAL
SECTION]
IC4203 16Mbit-
FLASH
RH-IXC100WJZZQ This IC is a high performance CMOS super technology 16Mbit Flash Memory.
Start software (loader) for the CPU with a built-in digital processor and application soft-
ware have been written on this Flash Memory.
The digital processor reads these softwares on start-up and implements them.
D2
[DIGITAL
TUNER
SECTION]
IC201 IF-PLL
Demodulator
VHITDA9886+-1 This IC is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound
IF signal PLL demodulator for positive and negative modulation, including sound AM
and FM processing.
TUN
ER
IC202 DVB-T
RECEIVER
RH-IXB964WJZZQ This IC is an OFDM demodulation single chip which converts the IF input signal of
OFDM into the MPEG2 signal and outputs it, and is a demodulation IC for terrestrial
broadcasting including compressed video, audio, and data service.
This IC complies with DVB-T(ETS 300 744).
TUN
ER

LC-37XD1E/RU SUPPLEMENT
3 – 2
2. IC1905: VHISii9025+-1Q
HDMI RECIEVER
Pin No. Pin Name I/O Pin Function
144 Q0 O 24-bit Output Pixel Data Bus. HDMI-B[0]
143 Q1 O 24-bit Output Pixel Data Bus. HDMI-B[1]
142 Q2 O 24-bit Output Pixel Data Bus. HDMI-B[2]
141 Q3 O 24-bit Output Pixel Data Bus. HDMI-B[3]
140 Q4 O 24-bit Output Pixel Data Bus. HDMI-B[4]
137 Q5 O 24-bit Output Pixel Data Bus. HDMI-B[5]
136 Q6 O 24-bit Output Pixel Data Bus. HDMI-B[6]
133 Q7 O 24-bit Output Pixel Data Bus. HDMI-B[7]
132 Q8 O 24-bit Output Pixel Data Bus. HDMI-G[0]
131 Q9 O 24-bit Output Pixel Data Bus. HDMI-G[1]
130 Q10 O 24-bit Output Pixel Data Bus. HDMI-G[2]
129 Q11 O 24-bit Output Pixel Data Bus. HDMI-G[3]
126 Q12 O 24-bit Output Pixel Data Bus. HDMI-G[4]

LC-37XD1E/RU SUPPLEMENT
3 – 3
125 Q13 O 24-bit Output Pixel Data Bus. HDMI-G[5]
124 Q14 O 24-bit Output Pixel Data Bus. HDMI-G[6]
123 Q15 O 24-bit Output Pixel Data Bus. HDMI-G[7]
119 Q16 O 24-bit Output Pixel Data Bus. HDMI-R[0]
118 Q17 O 24-bit Output Pixel Data Bus. HDMI-R[1]
117 Q18 O 24-bit Output Pixel Data Bus. HDMI-R[2]
116 Q19 O 24-bit Output Pixel Data Bus. HDMI-R[3]
113 Q20 O 24-bit Output Pixel Data Bus. HDMI-R[4]
112 Q21 O 24-bit Output Pixel Data Bus. HDMI-R[5]
111 Q22 O 24-bit Output Pixel Data Bus. HDMI-R[6]
110 Q23 O 24-bit Output Pixel Data Bus. HDMI-R[7]
1 DE O Data enable.
2 HSYNC O Horizontal Sync Output control signal.
3 VSYNC O Vertical Syanc Output control signal.
121 ODCK O Output Data Clock. HDMI-CLK
97 XTALIN I Crystal Clock Input.
96 XTALOUT O Crystal Clock Output.
88 MCLKOUT O Audio Master Clock Output.
87 MCLKIN I Audio Master Clock Input Reference.
86 SCK O I2S Serial Clock Output.
85 WS O I2S Word Select Output.
84 SDO O I2S Serial Data Output.
78 SPDIF O S/PDIF Audio Output
77 MUTEOUT O Mute Audio Output.
104 INT O Interrupt Output.
102 RESET# I Reset Pin. Active LOW. 5V Tolerant.
32 DSCL0 I DDC I2C Clock for Port 0. 5V Tolerant.
31 DSDA0 I/O DDC I2C Data for Port 0. 5V Tolerant.
30 DSCL1 I DDC I2C Clock for Port 1. 5V Tolerant.
29 DSDA1 I/O DDC I2C Data for Port 1. 5V Tolerant.
28 CSCL I Configuration I2C Clock. 5V Tolerant.
27 CSDA I/O Configuration I2C Data. 5V Tolerant.
103 SCDT O Indicates active video at HDMI input port.
107 CLK48B I/O Data Bus Latch Enable. 2
34 R0PWR5V I Port 0 Transmitter Detect. 5V Tolerant.
33 R1PWR5V I Port 1 Transmitter Detect. 5V Tolerant.
101 TEST I Test Terminal.
6.7.13.19 VCC - VCC(3.3V)
8.12.18 GND - Ground
10 RSET O Reset Pin.
11 COMP I Comparator
14,17,20,56,81,82,
83,93,100
NC - No internal connection.
9 EVNODD O Even/Odd field for interlaced modes.
40 R0XC+ I TMDS input clock pair. HDMI Port 0.
39 R0XC- I TMDS input clock pair. HDMI Port 0.
44 R0X0+ I TMDS input data pair. HDMI Port 0.
43 R0X0- I TMDS input data pair. HDMI Port 0.
48 R0X1+ I TMDS input data pair. HDMI Port 0.
47 R0X1- I TMDS input data pair. HDMI Port 0.
52 R0X2+ I TMDS input data pair. HDMI Port 0.
51 R0X2- I TMDS input data pair. HDMI Port 0.
59 R1XC+ I TMDS input clock pair. HDMI Port 1.
58 R1XC- I TMDS input clock pair. HDMI Port 1.
63 R1X0+ I TMDS input data pair. HDMI Port 1.
62 R1X0- I TMDS input data pair. HDMI Port 1.
67 R1X1+ I TMDS input data pair. HDMI Port 1.
66 R1X1- I TMDS input data pair. HDMI Port 1.
71 R1X2+ I TMDS input data pair. HDMI Port 1.
70 R1X2- I TMDS input data pair. HDMI Port 1.
22,23,35,74,79,92,
105,114,128,139
CVCC18 - Digital Logic VCC. (1.8V)
21,24,36,73,80,91,
106,115,127,138
CGND - Digital Logic GND.
5,16,26,76,89,109,
122,134
IOVCC - Input/Output Pin VCC. (3.3V)

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3. IC4203: RH-IXC100WJZZ
16Mbit Flash Memory
4,15,25,75,90,108,
120,135
IOGND - Input/Output Pin GND.
38,42,46,50,57,61,
65,69
AVCC - TMDS Analog VCC. (3.3V)
41,45,49,53,60,64,
68,72
AGND - TMDS Analog GND.
37 PVCC0 - TMDS Port 0 PLL VCC. (3.3V)
55 PVCC1 - TMDS Port 1 PLL VCC. (3.3V)
54 TMDSPGND - TMDS PLL GND.
94 AUDPVCC18 - ACR PLL VCC. (1.8V)
95 AUDPGND - ACR PLL GND.
98 XTALVCC - ACR PLL Crystal Input VCC. (3.3V)
99 REGVCC - ACR PLL Regulator VCC. (3.3V)
Pin No. Pin Name I/O Pin Function
1-9, 16-25, 48 A0-A19 I Address Inputs
29, 31, 33, 35, 38, 40, 42, 44 DQ0-DQ7 I/O Data Inputs/Outputs.
30, 32, 34, 36, 39, 41, 43 DQ8-DQ14 I/O Data Inputs/Outputs.
45 DQ15A-1 I/O Data Input/Output or Address Input.
26 E I Chip Enable.
28 G I Output Enable
11 W I Write Enable.
12 RP I Reset/Block Temporary Unprotect
15 RB O Read/Busy Output.
47 BYTE I Byte/Word Organization Select.

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3 – 5
4. IC201: VHITDA9886+-1
IF-PLL DEMODULATORS
37 Vcc - Supply Voltage.
27, 46 Vss - Ground.
10, 13, 14 N.C. - Not Connected Internally.
Pin No. Pin Name I/O Pin Function
1 VIF1 I VIF differential input 1
2 VIF2 I VIF differential input 2
3 OP1 O Output port 1;open-collector.
4 FMPLL I FM-PLL for loop filter.
5 DEEM O De-emphasis output for capacitor.
6 AFD I AF decoupling input for capacitor
7 DGND - Digital ground.
8 AUD O audio output.
9 TOP I tuner AGC TakeOver Pint (TOP) for resistor adjustment.
10 SDA I/O I2C-bus data input and output.
11 SCL I I2C-bus clock input.
12 SIOMAD O sound intercarrier output and MAD select with resistor.
13 N.C. - not connected.
14 TAGC O tuner AGC output.
15 REF I 4 MHz crystal or reference signal input.
16 VAGC(1) I VIF-AGC for capacitor.
17 CVBS O composite video output.
18 AGND - analog ground.
19 VPLL I VIF-PLL for loop filter.
20 VP - supply voltage.
21 AFC O AFC output.
22 OP2 O output port 2; open-collector.
23 SIF1 I SIF differential input 1 and MAD select with resistor.
24 SIF2 I SIF differential input 2 and MAD select with resistor.
DEMODULATOR

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3 – 6
5. IC202: RH-IXB964WJZZ
DVB-T RECEIVER
Pin No Pin Name I/O Description
32 NOT_RESET I Hardware reset, active Low.
15 XTAL_I I Crystal oscillator input/external clock(2.5V)
14 XTAL_O O Crystal oscillator output.
1 RF_LEVEL I ADC 8 input for RF level monitoring.
3 QP I Positive Q analog input for beaseband configuration,
4 QM I Nagative Q analog input for baseband configuration.
5 VDDA_ISO - Analog ISO neutral polarization.
7 REFP - Internal positive reference.
8 REFM - Internal negative reference.
9 INCM - Internal common mode.
10 IM I Negative 1 analog input for IF and baseband configuration.
11 IP I Positive 1 analog input for IF and baseband configuration.
12 VDDA_1V0 - Analog supply (1.0V)
29 SDA I/O Serial data (open drain)
30 SCL I Serial clock (open drain)
21 SDAT I/O SDA tuner (open drain)
20 SCLT I SCL tuner.
43 D7 O Serial MPEG data or parallel MPEG data (bit 7)
42 D6 O Parallel MPEG data (bit 6)
40 D5 O Parallel MPEG data (bit 5)
39 D4 O Parallel MPEG data (bit 4)
37 D3 O Parallel MPEG data (bit 3)
36 D2 O Parallel MPEG data (bit 2)
35 D1 O Parallel MPEG data (bit 1)
33 D0 O Parallel MPEG data (bit 0)
44 CLK_OUT O MPEG byte or bit clock
46 STR_OUT O MPEG first byte sync.
47 D/NOT_P O MPEG data valid/parity
48 ERROR O MPEG packet error

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3 – 7
18 AGC_RF I/O RF AGC control (5V tolerant)
17 AGC_IF I/O IF AGC control (5V tolerant)
64 TEST - Reserved test mode, must be grounded.
27 GPIO0 I/O General-purpose input/output port 0.
Reserved test mode, must be ground.
49 GPIO1 I/O General-purpose input/output port 1.
60 GPIO2 I/O General-purpose input/output port 2 or lock indicator.
59 GPIO3 I/O General-purpose input/output port 3 or lock indicator.
58 GPIO4 I/O General-purpose input/output port 4.
57 GPIO5 I/O General-purpose input/output port 5.
54 GPIO6 I/O General-purpose input/output port 6.
53 GPIO7 I/O General-purpose input/output port 7.
52 GPIO8 I/O General-purpose input/output port 8.
Resen must be ground.
61 GPIO9 I/O General-purpose input/output port 9.
23 AUX_CLK I/O Auxiliary clock.
25 CS0 I Chip select LSB.
2,6,13,16 VDDA_2V5 - Analog power supply (2.5V)
19,24,31,
38,45,51,
55,62
VDD_1V0 - Digital core supply (1.0V)
22,28,34,
41,50,56,
63
VDD_3V3 - Digital I/O supply (3.3V)

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LC-37XD1E Service Manual
CHAPTER 4. BLOCK DIAGRAM/WIRING DIAGRAM
[1] BLOCK DIAGRAM
123
4567 910 8
J
A
B
C
D
E
F
G
H
I
BLOCK DIAGRAM