LG RH178H User manual

HDD/DVD RECORDER
SERVICE MANUAL
MODELS : RH178H/188H/1999H/HDR688X
MODELS : RH178H/188H/1999H/HDR688XSERVICE MANUAL
P/NO : AFN30086042 APRIL,2006
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .RS-01A LOADER PART
SECTION 5 . . . .REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
NEW FUNCTIONS OF HDD/DVD-RECORDER................................................................. 1-2
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.............. 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING ................................................. 1-5
SPECIFICATIONS ...................................................................................................................... 1-6

1-3
NEW FUNCTIONS OF HDD/DVD-RECORDER
•HDMI
HDMI IS THE SPECIFICATION FOR THE HIGH-DEFINITION MULTIMEDIA INTERFACE. HDMI IS PROVID-
ED FOR TRANSMITTING DIGITAL TELEVISION AUDIOVISUAL SIGNALS FROM HDD-DVD RECORDER TO
TELEVISION SETS, OTHER VIDEO DISPLAYS. HDMI CAN CARRY HIGH QUALITY MULTI-CHANNEL
AUDIO DATA AND CAN CARRY ALL STANDARD AND HIGH DEFINITION CONSUMER ELECTRONICS
VIDEO FORMATS. CONTENT PROTECTION TECHNOLOGY IS AVAILABLE. HDMI CAN ALSO CARRY
CONTROL AND STATUS INFORMATION IN BOTH DIRECTIONS.
<< OPERATING >>
AUDIO, VIDEO AND AUXILIARY DATA IS TRANSMITTED ACROSS THE THREE TMDS DATA CHANNELS.
THE VIDEO PIXEL CLOCK IS TRANSMITTED ON THE TMDS CLOCK CHANNELAND IS USED BY THE
RECEIVER AS A FREQUENCY REFERENCE FOR DATA RECOVERY ON THE THREE TMDS DATA CHAN-
NELS.
VIDEO DATA IS CARRIED AS A SERIES OF 24-BIT PIXELS ON THE THREE TMDS DATA CHANNELS.
TMDS ENCODING CONVERTS THE 8BIT PER CHANNEL INTO THE 10BIT DC–BALANCED.
VIDEO PIXEL RATES CAN RANGE FROM 25MHZ TO 165MHZ. THE VIDEO PIXELS CAN BE ENCODED IN
EITHER RGB,YCBCR 4:4:4 OR YCBCR 4:2:2 FORMATS. IN ALL THREE CASES, UP TP 24 BITS PER
PIXEL CAN BE TRANSFERRED.
FAST DUBBING
DUBBING MEANS A COPYING FUNCTION BETWEEN HDD TO DVD DISCS.
COPYING BETWEEN HDD TO DVD IS A COMPLETELY DIGITAL PROCESS AND THEREFORE INVOLVES
NO LOSS OF QUALITY IN THE AUDIO OR VIDEO. SO THIS MEANS THAT COPYING CAN BE CARRIED
OUT AT THE MAXIMUM SPEED POSSIBLE.
<< DUBBING SPEED RATE >>
NORMAL DUBBING : SPEED RATE MAX X1
FAST DUBBING : SPEED RATE MAX X4
WHEN FAST DUBBING FROM HDD TO DVD , THE SPEED OF COPYING DEPENDS ON THE RECORDING
MODE AND THE KIND OF USING THE DVD DISC, AND THIS MODE IS NOT AVAILABLE FOR EDITED
VIDEO TITLE IN HDD.
WHEN FAST DUBBING FROM DVD TO HDD , ONLY AVAILABLE WHEN COPYING VR MODE DISC(DVD-
RW) TO HDD , AND ONLY NORMAL DUBBING AVAILABLE WHEN COPYING VIDEO MODE DISC
(DVD+R/RW, DVD-R) TO HDD

1-4
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from LG Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire haz-
ard. These components are indicated by the letter “x”included in their compo-
nent designators and are required to maintain safe performance. No deviations
are allowed without prior approval by LG Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes
into the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized modi-
fications will not only void the warranty, but may lead to property damage or
user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
service literature.
The lightning flash with arrowhead symbol within an equilateral tri-
angle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage”that may be of sufficient magni-
tude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi-
lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection fromAC line shock.
After the original service problem has been corrected, make a check of the fol-
lowing:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and
from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled
per the original design. Be sure that the safety purpose of the polarized line
plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign par-
ticles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor rated
at 1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all
exposed metallic parts of the cabinet (the channel selector knobs, antenna
terminals, handle and screws) to be sure that set is safe to operate without
danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS-
FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per
volt or more sensitivity in the following manner: Connect a 1500 ohm, 10
watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a
known good earth ground water pipe, conduit, etc.) and the exposed metal-
lic parts, one at a time. Measure the AC voltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where
dew is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. A product mounted to a
shelf or platform must retain its original feet (or the equivalent thickness in
spacers) to provide adequate air flow across the bottom. Bolts or screws
used for fasteners must not touch any parts or wiring. Perform leakage tests
on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilt-
ed position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small cast-
ers across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous conse-
quences to home and family.
A.C. Voltmeter
1500 OHM
10 WATT
Place this probe
on each exposed
metal part.
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.15uF
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-5
SERVICING PRECAUTIONS
CAUTION : Before servicing the HDD/DVD Recorder cov-
ered by this service data and its supplements and addends,
read and follow the SAFETY PRECAUTIONS. NOTE : if
unforeseen circumstances create conflict between the fol-
lowing servicing precautions and any of the safety precau-
tions in this publications, always follow the safety precau-
tions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the HDD/DVD Recorder AC power cord
from the AC power source before:
(1)Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2)Disconnection or reconnecting any internal electrical
plug or other electrical connection.
(3)Connecting a test substitute in parallel with an elec-
trolytic capacitor.
Caution : A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
2. Do not spray chemicals on or near this HDD/DVD
Recorder or any of its assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5. Do not applyAC power to this HDD/DVD Recorder and/or
any of its electrical assemblies unless all solid-state
device heat sinks are cerrectly installed.
6. Always connect test instrument ground lead to the
appropriate ground before connection the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter(500V)
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, Input terminals, Earphone jacks, etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially available discharging wrist strap device, which
should be removed for potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grouned-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static solder removal device. Some
solder removal devices not classified a “anti-static”can
generate electrical charges sufficient to damage ES
devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protec
tive package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
leads electrically shorted together by conductive foam,
aluminum foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution : Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

1-6
SERVICE INFORMATION FOR EEPROM IC SETTING
MICOM START
EEPROM ID CHECK
2 BYTE(B3,248,249) MODEL NAME HEX BINARY
RH.S OPT1 00 00000000
OPT2 00 00000000
OPT3 00 00000000
OPT4 00 00000000 (reserved)
OPT5 00 00000000 (reserved)
OPT6 00 00000000 (reserved)
OPT7 00 00000000 (reserved)
OPT8 00 00000000 (reserved)
WRITE:OK EXIT:MENU,MP
MOVE:< > EDIT : __
OPTION WRITE : OK (OK KEY IN)
MASK : R00 , EEP : R00 , (D10)
(Each mask ,eeprom, It shows a development
release version.)
DETECT NEW EEPROM (OPTION EDIT SCREEN)
*** EEPROM INITIAL ***
- SETUP is displayed in the field if pressing the Front ch- & ch+ Key with the Remocon number "clear"
key pressed in the status of powering on.
- AUTO SEARCH is done since the initial screen of ACMS is serviced if powering on.
OPTION DATA READ
5TIME & COMPARE
MICOM NORMAL
OPERATION START
Press the "CLEAR" key on the
Remote controller and the "CH - "
key one the Front Panel the same
time, then it goes in to Tracking
initial mode.
OPTION CONFIRMATION MODE
ID OK?
No
No
Yes
Yes
Yes

1-7
SPECIFICATIONS
•GENERAL
Power requirements AC 200-240V, 50/60 Hz
Power consumption 35W
Dimensions (approx.) 430 X 54 X 275 mm (w x h x d) without foot
Mass (approx.) 4.1 kg
Operating temperature 5°C to 35°C
Operating humidity 5 % to 90 %
Television system PAL I, B/G, I/I, SECAM D/K, K1 color system
Recording format PAL
•RECORDING
Recording format DVD Video Recording, DVD-VIDEO
Recordable media HDD (80GB), DVD-ReWritable, DVD-Recordable, DVD+ReWritable,
DVD+Recordable, DVD+Recordable (Double Layer)
Recordable time DVD (4.7GB): Approx. 1 hour (XP mode), 2 hours (SP mode),
4 hours (LP mode), 6 hours (EP mode)
DVD+R DL (8.5GB): Approx. 3 hour (XP mode),
3 hours 40 minutes (SP mode),
7 hours 10 minutes (LP mode),
10 hours 30 minutes (EP mode)
HDD (80GB): Approx. 20 hours (XP mode), 40 hours (SP mode),
74 hours (LP mode), 111 hours (EP mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG 2 (VBR support)
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
•PLAYBACK
Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
DVD (PCM 96 kHz): 8 Hz to 44 kHz
Signal-to-noise ratio More than 100 dB (AUDIO OUT connector)
Harmonic distortion Less than 0.008% (AUDIO OUT connector)
Dynamic range More than 95 dB (AUDIO OUT connector)
•INPUTS
AERIAL IN Aerial input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCART x 2
AUDIO IN 2.0 Vrms more than 47 kohms, RCA jack (L, R) x 2 / SCART x 2
S-VIDEO IN (Y) 1.0 V (p-p), 75 Ω, sync negative, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
DV IN 4 pin (IEEE 1394 standard)
•OUTPUTS
VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1 / SCART x 2
S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, sync negative, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
Audio output (optical audio) 3 V (p-p), 75 Ω, Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART x 2

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS ....................................................................................................................2-2
1. CABINET AND MAIN FRAME SECTION ................................................................................2-2
2. DECK MECHANISM SECTION(RS-01A) ................................................................................2-3
3. PACKING ACCESSORY SECTION .........................................................................................2-4

2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
A
A
C
B
BC
D
D
A54A
A54
A46
471
300
A47
104
101
468
468
410
103
A53
A60
A56
A50
280 275
275
275
452
452
452
A26
A43
A44
A52
253
*463/462
*463/462
250
*463/462
OPTIONAL PART HDMI MODEL ONLY
OPTIONAL PART
MEMORY
HDMI BOARD
MAIN BOARD
SMPS
I/O BOARD
CABLE3
CABLE11
CABLE10
CABLE5
CABLE2
CABLE1
A55
272
251
273
274
265
465
320
264
260
261
261
262
261
465
267
268
467
463
463
468
468
468
468
251
OPTIONAL PART
OPTIONAL PART
A
5
4
3
2
1
BCD

2-3
2. DECK MECHANISM SECTION(RS-01A)
1034
1030
1025
1041
1432
1437
1434
1032
1033
1038
1011
1432
1020
1036
1432
Main C.B.A
1001
1431
1003 1002
1026
A001
A60
A002
1016
1433
1017
1013
1015
1012
1439
1047
1048
1046
1014
1018
1019 1043 1045
1044
1042
A005

2-4
808 Battery
Cable, Coaxial
Plug Ass'y, 1Way
Plug Ass'y, 2Way
Bag
Packing
Remote Control
Instruction Ass'y
Packing
Box
806
804
803
811
812
FLAT CABLE
822
801
900
802
803
810 CABLE ASS'Y 821 SCART CABLE
OPTIONAL PART
3. PACKING ACCESSORY SECTION
832 DISC

3-1
SECTION 3
ELECTRICAL
CONTENTS
HDR PART
ELECTRICAL TROUBLESHOOTING GUIDE......................................................................................................................3-2
1. POWER SUPPLY ON SMPS BOARD...........................................................................................................................3-2
2. POWER SUPPLY ON I/O BOARD................................................................................................................................3-4
3. SYSTEM CIRCUIT PART..............................................................................................................................................3-7
4. DISC NOT RECOGNIZED.............................................................................................................................................3-7
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ..............................................................................................................3-8
6. NO OPTICAL / DIGITAL OUTPUT.................................................................................................................................3-9
7. NO TUNER AUDIO OUTPUT......................................................................................................................................3-10
8. NO EXTERNAL INPUT AUDIO....................................................................................................................................3-11
9. NO RGB / COMPONENT VIDEO SIGNAL WHEN PLAY DISC..................................................................................3-12
10. NO COMPOSITE / S-VIDEO SIGNAL WHEN PLAY DISC.......................................................................................3-12
11. NO TV, EXTERNAL INPUT VIDEO SIGNAL ............................................................................................................3-13
12. NO DV(IEEE 1394) INPUT (VIDEO/AUDIO) SIGNAL...............................................................................................3-14
BLOCK DIAGRAMS............................................................................................................................................................3-16
1. OVERALL BLOCK DIAGRAM .....................................................................................................................................3-15
2. LAYOUT CONNECTION BLOCK DIAGRAM_1 ..........................................................................................................3-17
3. LAYOUT CONNECTION BLOCK DIAGRAM_2 ..........................................................................................................3-19
4. SMPS BLOCK DIAGRAM............................................................................................................................................3-21
5. POWER : MAIN BOARD BLOCK DIAGRAM..............................................................................................................3-23
6. POWER : I/O BOARD BLOCK DIAGRAM ..................................................................................................................3-25
7. IN/OUT BLOCK DIAGRAM ( SCART MODEL ONLY )................................................................................................3-27
8. VIDEO BLOCK DIAGRAM...........................................................................................................................................3-29
9. VIDEO S/W PATH BLOCK DIAGRAM.........................................................................................................................3-31
10. AUDIO BLOCK DIAGRAM.........................................................................................................................................3-33
11. AUDIO S/W PATH BLOCK DIAGRAM.......................................................................................................................3-35
12. FLD / µ-COM / TUNER BLOCK DIAGRAM...............................................................................................................3-37
13. MAIN BLOCK DIAGRAM ( SCART MODEL ONLY ).................................................................................................3-39
14. TIMER BLOCK DIAGRAM.........................................................................................................................................3-41
CIRCUIT DIAGRAMS..........................................................................................................................................................3-43
1. SMPS 1 CIRCUIT DIAGRAM......................................................................................................................................3-43
2. SMPS 2 CIRCUIT DIAGRAM......................................................................................................................................3-45
3. MPEG CIRCUIT DIAGRAM.........................................................................................................................................3-47
4. FLASH/DDR CIRCUIT DIAGRAM...............................................................................................................................3-49
5. RESET & 1394 & JEPG CIRCUIT DIAGRAM.............................................................................................................3-51
6. ATAPI & MEMORY CARD CIRCUIT DIAGRAM..........................................................................................................3-53
7. I/O, µ-COM CIRCUIT DIAGRAM.................................................................................................................................3-55
8. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM...................................................................................................3-57
9. DECODER CIRCUIT DIAGRAM..................................................................................................................................3-59
10. TIMER CIRCUIT DIAGRAM ......................................................................................................................................3-61
•WAVEFORMS ...................................................................................................................................................................3-63
•CIRCUIT VOLTAGE CHART ............................................................................................................................................3-65
PRINTED CIRCUIT DIAGRAMS.........................................................................................................................................3-71
1. MAIN P.C.BOARD........................................................................................................................................................3-71
2. I/O P.C.BOARD............................................................................................................................................................3-73
3. POWER P.C.BOARD...................................................................................................................................................3-77
4. TIMER1 P.C.BOARD ...................................................................................................................................................3-79
5. TIMER2 P.C.BOARD ...................................................................................................................................................3-81
6. HDMI P.C.BOARD .......................................................................................................................................................3-83

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
HDR PART
Replace the BD101
Replace the F101
(Use the same Fuse)
No 5.3VA
Is the F101 Normal?
Is the TH01 Normal?
Is the Vcc (10V - 17V)
supplied to IC101 Pin6?
Is the BD101 Normal?
Is the D128 normal?
Is there about 2.5V at the
IC103 Pin1?
Is the D121 normal?
Is the D122 Normal?
Is the D125 Normal?
Is the D124 Normal?
Is the D127 Normal?
Is the D126 Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YESYES
YES
YES
YES
YES
YES
YES
YES
YES
Replace the TH101
Is the D102 normal?
Check or Replace the
D102
Replace the D128
Replace the IC103
Replace the D121
Replace the D122
Replace the D125
Replace the D124
Replace the D127
Replace the D126
1. POWER SUPPLY ON SMPS BOARD
Power Line of I/O PCB
is short

3-3
No 5V for HDD &
DVD Drive
Check D125 and
Replace
Is there about 5.5V
at the IC156 pin1?
Is there about 4V ~ 5V
at the IC156 pin 4?
NO
NO
Check the ‘PWR CTL
“H”’ signal from µ-COM
YES
YES
Check the IC156
and Replace
YES
No 12V for HDD &
DVD Drive
Check D124 and
Replace
Check the ‘PWR CTL
“H”’ signal from µ-COM
Is there about 13.5V
at the IC155 pin1?
Is there about 4V ~ 5V
at the IC155 pin 4?
Check the IC155
and Replace
NO
NO
YES
YES
YES

3-4
2. POWER SUPPLY ON I/O BOARD
No 33VT
Is the VCC (33V) sup-
plied to Q161 Emitor?
Check D126 on SMPS
Board and Replace
Is there about 0V
at Q152 Collector? Check Q161 and Replace
Check the ‘TIMER H’
signal from µ-COM
Is there about 5V at R180
and 0.7V at Q152 Base?
Check Q152 and
Replace
YES
YES
YES
No 5VT
Check 5.3VA on
SMPS Board
Check Q155 and
Replace
Is the VCC (5.3V) sup-
plied to Q155 Emitor?
Is there about 0V at D152
and Q152 Collector?
Is there about 5V at R180
and 0.7V at Q152 Base?
NO
NO
Check the ‘TIMER H’
signal from µ-COM
NO
YES
YES
YES
Check Q152 and
Replace
YES
No 12V
Check D124 on SMPS
Board and Replace
Check Q164 and
Replace
Check D126 on SMPS
Board and Replace
Check Q162 and
Replace
Check the ‘PWR CTL
H’signal from µ-COM
Is the VCC (14V) sup-
plied to Q164 Collector?
Is there about 12.5V at
ZD151 & Q164 Base?
Is the VCC (33V) sup-
plied to Q162 Emitor?
NO
NO
NO
NO
NO
YES
YES
YES
Is there about 0V
at Q162 Base?
YES
Is there about 5V at R171
and 0.7V at Q156 Base?
YES
Check Q156 and
Replace
YES
No 5.2V
Check 5.3VA on
SMPS Board
Is the VCC (5.3V) sup-
plied to Q151 Emitor?
Is there about 0V at D153
and Q156 Collector?
NO NO
Check Q151 and
Replace
Check the ‘PWR CTL
H’signal from µ-COM
NO
NO
NO
NO
YES
YES
Is there about 5V at R171
and 0.7V at Q156 Base?
Check Q156 and
Replace
YES
YES

3-5
No SW_5.3VA
Is the VCC (5.3V) sup-
plied to Q158 Emitor?
Check 5.3VA on
SMPS Board
Is there about 0V
at R179 and R156?
Check the ‘STANBY
H’signal from µ-COM
Check Q158 and
Replace
YES
YES
YES
No 3.3V
Check or Replace
the D127
Check the ‘PWR CTL
“H”’signal from µ-com
Is there about 3.8V at
the IC152 pin1?
Is there about 4V~ 5V
at the IC152 pin4?
Check the IC152
and Replace
NO
NO
YES
YES
YES
No 5.0VD
Check 5.3VA on
SMPS Board
Check the ‘PWR CTL
H’signal from µ-COM
Is there about 5.3V
at the IC153 pin 1?
Is there about 4V ~ 5V
at the IC153 pin 4?
Check the IC153
and Replace
NO
NO
YES
YES
YES
No 2.5V
Check D154 and
D127 on SMPS Board
Is there about 3V ~ 3.8V
at the IC151 pin 1?
Is there about 4V ~ 5V
at the IC151 pin 4?
NO NO
Check the ‘PWR CTL
H’signal from µ-COM
NO NO
YES
YES
Check the IC151
and Replace
YES

3-6
No SW_FD(+)
Check D121 on SMPS
Board and Replace
Check Q163 and
Replace
Is the VCC (FD+) sup-
plied to Q163 Collector ?
Is there about 5.3V at R184
and Q153 Collector ?
Is the VCC (5.3V) sup-
plied to Q153 Emitor ?
NO
NO
Check 5.3VA on
SMPS Board
NO
Check the ‘STANBY
H’signal from µ-COM
NO
YES
YES
YES
Is there about 0V
at Q153 Base ?
YES
Check Q153 and
Replace
YES
No SW_12VG
Check D124 on SMPS
Board and Replace
Check Q165 and
Replace
Is the VCC (14V) sup-
plied to Q165 Collector?
Is there about 12.5V at
ZD152 & Q165 Base?
Is the VCC (33V) sup-
plied to Q160 Emitor?
NO
NO
Check D126 on SMPS
Board and Replace
NO
Check Q160 and
Replace
NO
Check SW_5.3VA
NO
YES
YES
YES
Is there about 0V at
Q160 Base?
YES
Is there about 5.3V
at Q166 Base?
YES
Check Q166 and
Replace
YES
No 1.25V
Check D155 and
2.5V power supply
Check Q159 and
Replace
Is the VCC (2V) supplied
to Q154 Emitor ?
Is there about 2V ~ 2.5V at
Q154 Base and IC154 pin 4?
Is the VCC (3.3V) sup-
plied IC154 pin 1,2,8 ?
NO
NO
Check 3.3V power
supply
NO
YES
YES
YES
Check IC154 and
Replace
YES
No 1.8V
Check 3.3V power
supply
Check Q159 and
Replace
Is the VCC (3.3V) supplied to Q159
Emitor And IC154 pin 1,2,8 ?
Is there about 3V ~ 3.3V at
Q159 Base and IC154 pin 3 ?
Check IC154 and
Replace
NO
NO
YES
YES
YES

3-7
“Please wait”displayed
Continue at Power On
Check PVM02 pin 13
IC 701 pin 19 (R714)
IC1306 pin 5 : ?
(/HOST-RESET)
X1101 : Clock oscillated?
(13.5MHz)
NO
Replace X1101
NO
Check IC1201 (Flash
Memory) & IC1101
NO
IC1101 DEFECT
NO
YES
YES
R11A9 : ?
IC1201 pin 32 : ?
YES
R1173, R1174 : ?
YES
3. SYSTEM CIRCUIT PART
Check Driver Power?
5V,12V
Change MEDIA TEST
Check ATAPI Interface
PLL1604 & PML07
Check SMPS
NO
NO
YES
4. DISC NOT RECOGNIZED

3-8
CHECK IC803 pin 2,4 (VCC):12V
Pin 32,33 (SCL/SDA) :
IC808 pin 14,19 (Z_mute_R/L) :
IC701 pin 58 (A_mute_L) :
CHECK
IC808 pin 1,2,3,4 :
Pin 10 (Reset “H”)
Pin 7,8 (I2C) :
5. WHEN PLAYING DISC, NO AUDIO OUTPUT
CHECK
IC808 pin 17 (12V)
pin 5,11,20 (3.3V)
Replace IC808
YES
YES
IC808 pin 15,18(Audio_out R/L):
Is there a signal?
IC801 pin 1,7
Is there a signal?
IC803 pin 21,22,25,26
: Is there a signal?
CHECK Q801, Q802, Q803,
Q805, Q806, Q807, Q808
CHECK IC801 pin 8
(12V)
Replace IC801
Replace IC803
IC101
DEFECT
NO
L822, L823 :
Is there a signal?
YES
YES
YES
YES
YES
YES
YES YES
Only “Without SCART model”
L806, L826, L825, L810
: Is there a signal?
CHECK Cable connec-
tions & TV Audio mute.
NO
NO
NO
NO