JVC HV-32D25EJW, HV-32D25EUW Service Manual
52068200212
HV-32D25EUW
HV-32D25EJW
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
HV-32D25EUW
MK
HV-32D25EJW
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SERVICE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
No.52068
2002/12
HV-32D25EUW
HV-32D25EJW
SPECIFICATION
Item
Dimensions (W x H x D) 94.6cm x 56.2cm x 55.1cm
Mass 58.0kg
TV RF System CCIR B/G, I, D/K, L/L’
Colour System PAL / SECAM / NTSC
*The EXT terminals also support the NTSC 3.58MHz/4.43MHz system.
Stereo System A2 (B/G, D/K) / NICAM (B/G, I, D/K, L)
Teletext System FLOF(Fastext), TOP, WST(World Standard system)
Receiving Frequency VHF
UHF
CATV
Intermediate Frequency VIF
SIF
Colour Sub Carrier
Frequency
Power Input AC 220V~AC240V, 50Hz
Power Consumption Max 300W / Avg. 160W
Aerial Input 75 ohm unbalanced, coaxial
Picture Tube Visible size 76 cm(measured diagonally) Aspect ratio 16:9
High Voltage 31.0kV 0.2kV (At beam current : 0uA )
Speaker MAIN
EXT-1 (Input/Output) 21 pin Euro connector (SCART socket)
EXT-2 (Input/Output) 21 pin Euro connector (SCART socket)
EXT-3 (Input/Output) 21 pin Euro connector (SCART socket)
EXT-4 (Input) Component
EXT-5 (Input) Video 1V(p-p), 75 ohm RCA pin jack x 1
DIGITAL AUDIO INPUT OPTICAL x 1
AUDIO OUT (Variable) 0~1V(rms), Low Impedance RCA pin jack x 3
SURROUND REAR OUT 7.5W + 7.5W, 8 ohm (push terminal)
Headphone jack Stereo mini jack (Ø3.5mm)
Remote Control Unit RM-C61 (AAA/R03 Dry cell battery x 2) : HV-32D25EUW
PAL
SECAM
NTSC
CENTER
WOOFER
video
Audio (L/R) 500mv(rms) (-4dBs), High Impedance RCA pin jack x 2
Audio (L/R) 500mv(rms) (-4dBs), High Impedance RCA pin jack x 2
S-Video Mini DIN 4-pin
47MHz ~ 470MHz
470MHz ~ 862MHz
116MHz ~ 172MHz / 220MHz ~ 469MHz
38.9MHz(B/G, D/K, I) / 33.95MHz(L’)
33.4MHz(5.5MHz:B/G) / 32.9MHz(6.0MHz:I) / 32.4MHz(6.5MHz:L,D/K) /
40.45MHz(6.5MHz:L’)
4.43MHz
4.40625MHz / 4.25MHz
3.58MHz / 4.43MHz
10W + 10W, 13 cm x 6.5 cm oval x2
7.5W, 16 cm x 4 cm oval x 1
18W, 13 cm round x 1
• Video input, Audio L/R inputs and RGB inputs are available.
• TV broadcast outputs (Video and Audio L/R) are available.
• Video input, S-Video (Y/C) input, Audio L/R inputs and RGB inputs are available.
• Video and Audio L/R outputs are available.
• T-V LINK functions are available.
• Video input, S-Video (Y/C) input and Audio L/R inputs are available.
RCA pin jack x 3
Y : 1V(p-p), 75 ohm
Pb / B-Y: 0.7V(p-p), 75 ohm
Pr / R-Y : 0.7V(p-p), 75 ohm
Progressive-scanning signals(626p or 525p) are available
Y : 1V(p-p) Positive (Negative sync provided), 75 ohm
C : 0.286V(p-p) (burst signal), 75 ohm
COAXIAL x 1 (Dolby Digital is available.)
RM-C62 (AAA/R03 Dry cell battery x 2) : HV-32D25EJW
HV-32D25EUW HV-32D25EJW
Content
47MHz ~ 470MHz (IRELAND only)
470MHz ~ 862MHz
-
-
Design & specifications are subject to change without notice.
Manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol ( )are trademarks of Dolby Laboratories Licensing Corporation.
2
21-pin Euro connector (SCART) : EXT-1/EXT-2/EXT-3
PinNo. Signal Designation Matching Value EXT-1 EXT-2 EXT-3
1 AUDIO R output 500mV(rms) (Nominal),
Used (TV OUT) Used (LINE OUT) NC
Low impedance
2 AUDIO R input 500mV(rms) (Nominal),
Used Used Used
High impedance
3 AUDIO L output 500mV(rms) (Nominal),
Used (TV OUT) Used (LINE OUT) Not used
Low impedance
4 AUDIO GND Used Used Used
5 GND (B) Used Used Used
6 AUDIO L input 500mV(rms) (Nominal),
Used Used Used
High impedance
7 B input 700mV
8 FUNCTION SW
(SLOW SW)
Low : 0V-3V, High : 8V-12V,
High impedance
, 75 ohm Used Used Not used
(B-W)
Used Used Used
9 GND (G) Used Used Used
10 SCL Not used Used (SCL2) Used (SCL3)
11 G input 700mV
, 75 ohm Used Used Not used
(B-W)
12 SDA Not used Used(SDA2) Used(SDA3)
13 GND (R) Used Used Used
14 GND (YS) Used Not used Not used
15 R / C input R : 700mV
C : 300mV
16 Ys input
(FAST SW)
Low : 0V-0.4V, High : 1V-3V,
75 ohm
(B-W)
(P-P)
, 75 ohm
, 75 ohm
Used (R) Used (C2/R) Used (C3)
Used Used Not used
17 GND (VIDEO output) Used Used Used
18 GND (VIDEO input) Used Used Used
19 VIDEO output 1V
(Negative going sync),
(P-P)
Used (TV OUT) Used (LINE OUT) Not used
75 ohm
20 VIDEO / Y input 1V
(Negative going sync),
(P-P)
Used Used Used
75 ohm
21 COMMON GND Used Used Used
HV-32D25EUW
HV-32D25EJW
(P-P= Peak to Peak, B-W= Blanking to white peak)
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
3
HV-32D25EUW
HV-32D25EJW
SECTION 1
SAFETY PRECAUTIONS
1.1 HV-32D25EUW
(1) The design of this product contains special hardware,
many circuits and components specially for safety purposes. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be performed by qualified personnel only.
(2) Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or property damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics are often not evident from visual inspec tion nor can the
protection afforded by them necessarily be obtained by
using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special
safety characteristics are identified in the parts list of Service manual. Electrical components having such fea-
tures are identified by shading on the schematics and
by ( ) on the parts list in Service manual. The use of
a substitute replacement which does not have the same
safety characteristics as the recommended replacement
part shown in the parts list of Service manual may cause
shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and ISO-
LATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.).
If above note will not be kept, a fuse or any parts will be
broken.
(5) If any repair has been made to the chassis, it is recom-
mended that the B1 setting should be checked or adjusted
(See ADJUSTMENT OF B1 POWER SUPPLY).
(6) The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and
possible component damage, therefore operation under
excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause
by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain
the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube
must be the exact replacements or alternatives approved
by the manufacturer of the complete product.
(7) Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and
connecting the other end of the lead through a 10k 2W
resistor to the anode button.
(8) When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced.
Always use the manufacturer's replacement components.
(9) Isolation Check
(Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/ audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone
jack, control shafts, etc.) to be sure the product is safe to
operate without danger of electrical shock.
a) Dielectric Stren gth Tes t
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand
a voltage of 3000V AC (r.m.s.) for a period of one second.
(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an ap-
pliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally found in the service trade.
b) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500 ohm
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage across
the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and
measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC
(r.m.s.). This corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000Ω/V,
OR MORE SENSITIVITY)
0.15uF AC-TYPE
PLACE THIS PROBE
1500Ω 10W
GOOD EARTH GROUND
ON EACH EXPOSED
METAL PART
4
HV-32D25EUW
HV-32D25EJW
1.2 HV-32D25EJW [UK VERSION]
(1) The design of this product contains special hardware and many circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the origina l circuits. Service should be performed by qualified personnel
only.
(2) Alterations of the design or circuitry of the product should not be made. Any design alterations or additions will void the manu-
facturer's warranty and will further relieve the manufacturer of resp onsibility for personal injury or property damage resulting
therefrom.
(3) Many electrical and mechanical parts in the product have special safety-related characteristics. These characteristics are often
not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified
in the Parts List of Service Manual. Electrical components having such features are identified by sh ading on the schematics
and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety
characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock, fire, or other
hazards.
(4) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the l ike to be separated from liv e
parts, high temperature parts, moving parts and / or sharp edges for th e prevention of electric shock and fi re hazard. When
service is required, the original lead routing and dress should be observed, an d it should be confirmed that they have been
returned to normal, after re-assembling.
WARNING
(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.
5
HV-32D25EUW
HV-32D25EJW
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 MAIN DIFFERENCE LIST ITEM HV-32D25EUW HV-32D25EJW
POWER CORD QMPK160-185-JC QMPN130-185-JC
REMOTE CONTROL UNIT RM-C61-1C RM-C62-1C
LCT1272-001A-U
INST BOOK
RATING LABEL LC11548-003A-U LC11364-018A-U
EURO LABEL AEM1064-034-E AEM1064-035-E
2.1.1 FEATURES
• DIST (Digital Image Scaling Technology) employs an interpolat ion method that doubles the scanning lines to realize 1250-line
flicker-free picture making it especially suitable for reproducing high-resolution pictures even on large-scre en displays.
• New chassis design enables use of an interactive on-screen control.
• Pure flat CRT produces fine textured picture in every detail.
• With AUDIO/VIDEO/COMPONENT input terminals.
2
C bus control utilizes single chip ICs.
•I
• By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can al so be rearranged
automatically.
LCT1273-001A-U
LCT1274-001A-U
LCT1271-001A-U
6
2.2 SYSTEM BLOCK
HV-32D25EUW
HV-32D25EJW
IC004
MEMORY
IC201
SYNC.SEP.
IC101
COMPONENT SW
TU002
SUB TUNER
SDA 0
SCL 0
IC001
MICRO COMPUTER
SDA 2
SCL 2
SDA 1
SCL 1
DOLBY PWB AV SW PWB
MICOM
PWB
IC301
PROCESSOR
TU001
MAIN
TUNER
TONE/VOL
(MAIN L/R)
MAIN
PWB
RGB
IC601
IC501
MULTISOUND
PROCESSOR
IC101
AV SW
IC003
A-D CONVERT
SDA 3
SCL 3
IC201
DIGITAL
ENHANCER
SDA 3
SCL 3
IC651
TONE/VOL
(SUB L/R)
IC631
TONE/VOL
(CENTRE/WOOFER)
DIST PWB
IC101
DIST
7
HV-32D25EUW
HV-32D25EJW
2.3 FUNCTIONS
2.3.1 FRONT CONTROL & REAR (SIDE) TERMINAL
Refer to the pages in brackets for details.
Remote control sensor
Power lamp (GREEN : Operation, RED : Stand-by)
Main power button
Headphone jack (mini jack)
Channel up/down & Volume +/- buttons
Volume button
EXT-5 terminal
S
E
P
X
L
T
5
R
S
E
P
X
L
T
5
R
2.3.2 REAR TERMINAL
Woofer terminal
AUDIO OUT terminal
SURROUND REAR terminal
EXT-1 terminal
EXT-2 terminal
EXT-3 terminal
EXT-4 terminal
Aerial socket
DIGITAL AUDIO IN terminal
8
2.3.3 REMOTE CONTROL UNIT
RM-C62 : HV-32D25EJW RM-C61 : HV-32D25EUW
HV-32D25EUW
HV-32D25EJW
123
456
7809
MULTI
FREEZE
SUB-P
123
456
7809
FREEZE
SUB-P
Muting button
Number buttons
ZOOM button
3D sound button
Information button
TV button
buttons
Standby button
Colour buttons
OK button
buttons
VCR/DVD/Teletext control button
VCR DVD switch
(Text) button
PIP button
FREEZE button
SUB-P / button
SWAP button
MULTI button
Muting button
Number buttons
ZOOM button
3D sound button
Information button
TV button
buttons
Standby button
Colour buttons
OK button
buttons
VCR/DVD/Teletext control button
VCR DVD switch
(Text) button
PIP button
FREEZE button
SUB-P / button
button
button
9
HV-32D25EUW
HV-32D25EJW
2.4 DISASSEMBLY PROCEDURE
2.4.1 REMOVING THE SUB WOOFER UNIT & THE REAR COVER
(1) Unplug the power cord.
(2) Remove the SUB WOOFER CORD from the TERMINAL
AV TERMINAL BOARD.
(3) Pull up the SUB WOOFER UNIT on the top of the REAR
COVER upward.
(4) Remove the 13 screws [A] as shown in the Fig. 1
(5) Withdraw the REAR COVER toward you.
2.4.2 REMOVING THE SIDE CONTROL JACK ASSEMBLY
*Remove the REAR COVER.
(1) Remove the 1 screw [B] as shown in the Fig.1.
(2) While slightly raise the SIDE CONTROL JACK ASSEMBLY,
remove the 2 claws under the SIDE CONTROL JACK
ASSEMBLY.
(3) Disconnect the connector F and CN8016 as shown in Fig.
2.
2.4.3 REMOVING THE SIDE CONTROL PWB
* Remove the REAR COVER.
* Remove the SIDE CONTROL ASSEMBLY.
(1) Remove the 3 claws [C] from back side of the SIDE
CONTROL JACK ASSEMBLY as shown in Fig. 2.
(2) Pull out the SIDE CONTROL PWB.
(2) Remove the 4 screws [G] attaching the SIDE SPEAKER.
(3) Follow the same steps when removing the other hand
speaker.
2.4.8 REMOVING THE AV TERMINAL BOARD
* Remove the REAR COVER.
(1) Remove the 8 screws [H] as shown in the Fig. 1.
(2) Remove the 3 claws [ I ] under the CHASSIS as shown in
Fig. 3
(3) Remove the AV TERMINAL BOARD slightly in the
direction of arrow [J] as shown in Fig. 3.
(4) After re moving the 1 clow [K] on the connector for SUB
WOOFERS pull out the connector for SUB WOOFER.
(Fig. 4)
J
AV
TERMINAL
BOARD
AV SW PWB
I
C
SIDE
F Connector
CN8016 Connector
CONTROL
PWB
C
(Back view)
Fig.2
2.4.4 REMOVING THE MAIN CHASSIS
* Remove the REAR COVER.
(1) Slightly raise the both sides of the MAIN CHASSIS by
hand and remove the two claws under the both sides of
the MAIN CHASSIS from the front cabinet
(2) Withdraw the MAIN CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
2.4.5 REMOVING THE POWER & DEF. PWB
* Remove the MAIN CHASSIS.
(1) Remove the 3 screws [D] as shown in Fig. 1.
(2) Remove the POWER & DEF. PWB upper.
(If necessary, take off the wire clamp, connectors etc.)
2.4.6 REMOVING THE CENTER SPEAKER
* Remove the REAR COVER
* Remove the MAIN CHASSIS.
(1) Remove the 2 screws [E] as shown in Fig. 1.
(2) Remove the CENTER SPEAKER. If necessary, detach
the cables.
2.4.7 REMOVING THE SIDE SPEAKER
*Remove the REAR COVER
(1) Remove the 2 screws [F], and remove the speaker
adapter as shown in Fig. 1
NOTE:
When removing the 2 screws marked [F] of the speaker
adapter remove the lower side screw first, and then
remove the upper one
I
Fig.3
WOOFER
CORD
K
AV TERMINAL BOARD
K
CONNECTOR for
SUB WOOFER
SUB WOOFER
CORD
Fig.4
2.4.9 CHECKING THE PW BOARD
(1) Pull out the MAIN CHASSIS. (Refer to REMOVING THE
MAIN CHASSIS)
(2) Erect the MAIN CHASSIS vertically so th at you can easi ly
check the back side of the PW board.
CAUTION:
• When erecting the MAIN CHASSIS, be careful so that
there will be no contacting with other PW board.
• Before turning on power, make sure that the wire connector
is properly connected.
• When conducting a check with power supplied, be sure to
confirm that the CRT EARTH WIRE (BRAIDED ASS.Y) is
connected to the CRT SOCKET PW board.
2.4.10 WIRE CLAMPING AND CABLE TYING
(1) Be sure to clamp the wire.
(2) Never remove the cable tie used for tying the wires
together. Should it be inadvertently removed, be sure to tie
the wires with a new cable tie.
10
HV-32D25EUW
HV-32D25EJW
F
FRONT CABINET
Fig. 2
SIDE CONTROL JACK
ASSEMBLY
SPEAKER
ADAPTER
G
( 4)
SIDE
O
CRT S
PWB
FRONT
CONTRO
PWB
MAIN
CENTER
SPEAKER
PWB
CKET
LINE FILTER PWB
MICOM
PWB
L
CLOW
AV SW
PWB
D
( 3)
DOLBY PWB
12
CLOW
Fig.4
POWER & DE
DEF OSC PWB
EHT PWB
DIST PWB
SPEAKER
F. PWB
CHASSIS BASE
AV TERMINAL
BOARD
H
(
8)
B
E
( 2)
REAR COVER
A
(
Fig.1
SUB WOOFER
13)
POWER
CORD
UNIT
SUB WOOFER
CORD
11
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