JVC InteriArt T-V LINK AV-28H4BU User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.YA063
2004/3
COLOUR TELEVISION
YA06320043AV-28H4BU, AV-28H4SU,
AV-28H40SU, AV-28H77SK,
AV-32H4BU, AV-32H4SU,
AV-32H40SU, AV-32H47SU,
AV-32H77SK
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
BASIC CHASSIS
ML2
1 2 3
4 5 6
7 8 9
0
P
AV
TV OK
MENU
P
TV
AV-28H4SU, AV-28H4BU
AV-32H4SU, AV-32H4BU
AV-28H40SU, AV-28H77SK
AV-32H40SU, AV-32H77SK
AV-32H47SU

1-2 (No.YA063)
SPECIFICATION
Design & specifications are subject to change without notice.
Item
Content
AV-28H4BU
AV-28H4SU AV-28H40SU AV-28H77SK
Dimensions ( W ×H ×D ) 76.2cm ×52.8cm ×49.3cm 85.4cm ×50.8cm ×49.0cm
Mass 39.0kg
TV RF System CCIR (B/G, D/K, I, L) CCIR (I)
Colour System PAL
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
Stereo System A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Teletext System FLOF (Fastext)
TOP (German system)
WST (World standard system)
FLOF (Fastext)
WST(World standard system)
Receiving
Frequency
VHF 47MHz ~ 470MHz ---
UHF 470MHz ~ 862MHz
French CATV 116MHz ~ 172MHz
220MHz ~ 469MHz ---
Intermediate
Frequency
VIF 38.9MHz (B/G, D/K, I, L) 38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
32.9MHz (6.0MHz:I)
Colour Sub
Carrier Frequency
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz ---
NTSC 3.58MHz / 4.43MHz
Power Input AC220V ~ AC240V, 50Hz
Power Consumption 120W, standby : 2.5W
Aerial Input Terminal 75Ωunbalanced, coaxial
Picture Tube Visible size : 66cm, Measured diagonally H : 58.3cm ×V : 33.0cm
High Voltage 31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker 13cm ×6.5cm oval type ×2
Audio Power Output 10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector, SCART socket ×3
EXT-4 (Input) S-Video
Video
Audio (L/R)
Mini-DIN 4 pin ×1
Y : 1V(p-p) positive (negative sync, 75Ω)
C : 0.3V(p-p) (Burst signal, 75Ω)
1V(p-p) 75ohm, RCA pin jack ×1
500mV(rms) (-4dBs), High impedance, RCA pin jack ×2
AUDIO OUT (Variable) 0~1000mV(rms), Low impedance, RCA pin jack ×2
Headphone Jack 3.5mm Stereo mini jack ×1
Remote Control Unit RM-C64H (AAA/R03 dry battery ×2)

(No.YA063)1-3
Design & specifications are subject to change without notice.
Item
Content
AV-32H4BU
AV-32H4SU AV-32H40SU AV-32H47SU AV-32H77SK
Dimensions ( W ×H ×D )
86.4cm × 58.7cm × 55.0cm 94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm
Mass 53.0kg 52.5kg 53.0kg
TV RF System CCIR (B/G, D/K, I, L) CCIR (I)
Colour System PAL
SECAM
NTSC 3.58 / NTSC 4.43 (Only in EXT mode)
PAL
NTSC 3.58 / NTSC 4.43
(Only in EXT mode)
Stereo System A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Teletext System FLOF (Fastext)
TOP (German system)
WST(World standard system)
FLOF (Fastext)
WST
(World standard system)
Receiving
Frequency
VHF 47MHz ~ 470MHz ---
UHF 470MHz ~ 862MHz
French
CATV
116MHz ~ 172MHz
220MHz ~ 469MHz ---
Intermediate
Frequency
VIF 38.9MHz (B/G, D/K, I, L) 38.9MHz (I)
SIF 33.4MHz (5.5MHz:B/G)
32.9MHz (6.0MHz:I)
32.4MHz (6.5MHz:L, D/K)
32.9MHz (6.0MHz:I)
Colour Sub
Carrier Fre-
quency
PAL 4.43MHz
SECAM 4.40625MHz / 4.25MHz ---
NTSC 3.58MHz / 4.43MHz
Power Input AC220V ~ AC240V, 50Hz
Power Consumption 130W, standby : 2.5W
Aerial Input Terminal 75Ωunbalanced, coaxial
Picture Tube Visible size : 76cm, Measured diagonally H : 67.4cm ×V : 38.4cm
High Voltage 31.0kV (+1kV / -1.5kV) (at zero beam current)
Speaker 13cm ×6.5cm oval type ×2
Audio Power Output 10W + 10W
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector, SCART socket ×3
EXT-4 (Input) S-Video
Video
Audio (L/R)
Mini-DIN 4 pin ×1
Y : 1V(p-p) positive (negative sync, 75Ω)
C : 0.3V(p-p) (Burst signal, 75Ω)
1V(p-p) 75ohm, RCA pin jack ×1
500mV(rms) (-4dBs), High impedance, RCA pin jack ×2
AUDIO OUT (Variable) 0~1000mV(rms), Low impedance, RCA pin jack ×2
Headphone Jack 3.5mm Stereo mini jack ×1
Remote Control Unit RM-C64H (AAA/R03 dry battery ×2)

1-4 (No.YA063)
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]
(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 inspection
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 features 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
ISOLATED (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
recommended that the B1 setting should be checked or
adjusted (See B1 POWER SUPPLY check).
(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 10kΩ
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 Strength Test
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
appliance 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 1000Ωper volt or more
sensitivity in the following manner. Connect a 1500Ω
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 1000 /V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

(No.YA063)1-5
1.2 SAFETY PRECAUTIONS [FOR UK]
(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 original 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
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 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 shading 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 like to be separated from live parts,
high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and 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.

1-6 (No.YA063)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
• New chassis design enable use of an interactive on screen
control.
• The TELETEXT SYSTEM has a built-in FASTEXT (UK
system), TOP (German system) and WST (world standard
system) system.
• Because this TV unit corresponds to multiplex broadcast,
users can enjoy music programs and sporting events with live
realism. In addition, BILINGUAL programs can be heard in
their original language.
• Users can make VCR dubbing of picture and sound by
controlling the AV selector to select an optional source at the
EXT-2 output shown in figure.
2.2 21-pin Euro connector (SCART) : EXT-1/EXT-2/EXT-3
(P-P= Peak to Peak, B-W= Blanking to white peak)
2.3 MAIN DIFFERENCE LIST
Pin No. Signal designation Matching value EXT-1 EXT-2 EXT-3
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT) Not used
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2) Used (R3)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT) Not used
4 AUDIO GND Used Used Used
5GND(B) Used Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2) Used (L3)
7 B input 700mV(B-W), 75ΩUsed Used Not used
8FUNCTION SW
(SLOW SW)
Low : 0V-3V
High : 8V-12V, High impedance Used Used Used
9GND(G) Used Used Used
10 SCL / T-V LINK Not used Used
(SCL2 / TV-LINK) Not used
11 G input 700mV(B-W), 75ΩUsed Used Not used
12 SDA Not used Used (SDA2) Not used
13 GND (R) Used Used Used
14 GND (YS) Used Not used Not used
15 R / C input R : 700mV(B-W), 75Ω
C : 300mV(P-P), 75ΩUsed (R) Used (C2/R) Used (C3)
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75ΩUsed Used Not used
17 GND (VIDEO output) Used Used Used
18 GND (VIDEO input) Used Used Used
19 VIDEO output 1V(P-P) (Negative sync), 75ΩUsed (TV OUT) Used (LINE OUT) Not used
20 VIDEO / Y input 1V(P-P) (Negative sync), 75ΩUsed Used Used
21 COMMON GND Used Used Used
Item AV-28H4BU AV-28H4SU AV-28H40SU AV-28H77SK
Dimensions ( W × H × D ) 76.2cm × 52.8cm × 49.3cm ← 85.4cm × 50.8cm × 49.0cm ←
Mass 39.0kg ←←←
Cabinet colour Black Silver ←←
Power cord EU type(2-pin) ←←UK type(3-pin)
Colour system PAL, SECAM ←←PAL
RF system CCIR (B/G, D/K, I, L) ←←CCIR (I)
Item AV-32H4BU AV-32H4SU AV-32H40SU AV-32H47SU AV-32H77SK
Dimensions ( W × H × D ) 86.4cm × 58.7cm × 55.0cm ← 94.6cm × 56.1cm × 54.7cm 94.8cm × 56.2cm × 55.0cm 94.6cm × 56.1cm × 54.7cm
Mass 53.0kg ←←52.5kg 53.0kg
Cabinet colour Black Silver ←←←
Power cord EU type(2-pin) ←←←UK type(3-pin)
Colour system PAL, SECAM ←←←PAL
RF system CCIR (B/G, D/K, I, L) ←←←CCIR (I)
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]

(No.YA063)1-7
2.4 TECHNINAL INFORMATION
2.4.1 MAIN MI-COM (CPU) PIN FUNCTION
Pin
No. Pin name I/O Function Pin No. Pin name I/O Function
1 TCK I Not used 65 D2 I/O Data bit for PP-RAM/SD-RAM
2 TMS I Not used 66 D12 I/O Data bit for PP-RAM/SD-RAM
3 TDI I Not used 67 D10 I/O Data bit for PP-RAM/SD-RAM
4 TDO O Not used 68 VSS33 -- GND
5 P2.8 I Remote control 69 VDD33 i 3.3V
6 P2.9 I Key scan for front control CH+(On: L) 70 D4 I/O Data bit for PP-RAM/SD-RAM
7 P2.10 I Key scan for front control CH- (On: L) 71 D3 I/O Data bit for PP-RAM/SD-RAM
8 P2.11 I Key scan for front control MENU (On: L) 72 D11 I/O Data bit for PP-RAM/SD-RAM
9 P2.12 I Receive data for TV_LINK 73 RSTIN I Reset for main CPU
10 P2.13 O Power on /off control (ON: L) 74 P3.0 I/O Data for inter IC control bus
11 P2.14 I
X-ray HB LB EW correction Protection detection (Normal: H) 75 P3.1 I/O Data for inter IC control bus
12 P2.15 I Main power detection (Normal: H) 76 P3.2 I Remote control
13 VSS33 -- GND 77 P3.3 O Power indication control (On: L)
14 VDD33 i 3.3V 78 P3.4 O Audio muting (Muting: H)
15 P4.5/CS3 O Output data for TV_LINK 79 P3.5 O Audio muting (Muting: H)
16 P4.4/A20 O Address bit for PP-RAM/SD-RAM 80 P3.6 O Not used
17 P4.3/A19 O Address bit for PP-RAM/SD-RAM 81 P3.7 O Not used
18 P4.2/A18 O Address bit for PP-RAM/SD-RAM 82 P3.8 I/O Not used
19 P4.1/A17 O Address bit for PP-RAM/SD-RAM 83 P3.9 I/O Not used
20 VSS25 -- GND 84 VSS33 -- GND
21 VDD25 I 2.5V 85 VDD33 I 3.3V
22 P4.0/A16 O Address bit for PP-RAM/SD-RAM 86 VSS25 -- GND
23 A8 O Address bit for PP-RAM/SD-RAM 87 VDD25 I 2.5V
24 A7 O Address bit for PP-RAM/SD-RAM 88 TXD0 I/O Not used
25 A9 O Address bit for PP-RAM/SD-RAM 89 RXD0 I/O Not used
26 A6 O Address bit for PP-RAM/SD-RAM 90 P3.12 O Not used
27 A5 O Address bit for PP-RAM/SD-RAM 91 P3.13 O Not used
28 A10 O Address bit for PP-RAM/SD-RAM 92 P3.15 O Not used
29 A11 O Address bit for PP-RAM/SD-RAM 93 P5.14 I RGB input of EXT-2 active
30 A12 O Address bit for PP-RAM/SD-RAM 94 P5.15 I Headphone connection detection (Connect: H)
31 VSS33 -- GND 95 TRIG_IN -- Not used
32 VDD33 i 3.3V 96 TRIG_OUT -- Not used
33 A4 O Address bit for PP-RAM/SD-RAM 97 P6.2 O Notifies bus free state (Stop mode: H)
34 A3 O Address bit for PP-RAM/SD-RAM 98 P6.3 O Clock for inter IC control bus
35 A2 O Address bit for PP-RAM/SD-RAM 99 P6.4 I/O Data for inter IC control bus
36 A1 O Address bit for PP-RAM/SD-RAM 100 P6.5 O MSP reset (Reset: H)
37 A0 O Address bit for PP-RAM/SD-RAM 101 P6.6 -- Not used
38 A13 O Address bit for PP-RAM/SD-RAM 102 VSYNC I Vertical sync
39 A14/RAS O Row address strobe for SD-RAM access 103 HSYNC I Horizontal sync
40 A15/CAS O Column address strobe for SD-RAM access 104 COR/RSTOUT O Output for contrast reduction
41 VSS33 -- GND 105 BLANK/CORBLA O Ys for OSD Teletext (blanking)
42 VDD33 I 3.3V 106 VDD33 I 3.3V
43 MEMCLK O Clock for SD-RAM 107 VSS33 -- GND
44 CSSDRAM O Chip select signal for SD-RAM device 108 XTAL1 I System clock (4MHz)
45 CLKEN O Enable for memory clock 109 XTAL2 O System clock (4MHz)
46 CSROM O Chip select signal for PP-ROM device 110 VSSA -- GND
47 RD O External memory read strobe for PP-ROM 111 VDDA I 2.5V
48 UDQM O Write disable for high byte 112 R O Red for OSD / Teletext
49 LDQM O Write disable for low byte 113 G O Green for OSD / Teletext
50 WR O Memory write strobe 114 B O Blue for OSD / Teletext
51 D15 I/O Data bit for PP-RAM/SD-RAM 115 VSSA -- GND
52 VSS33 -- GND 116 VDDA -- 2.5V
53 VDD33 I 3.3V 117 CVBS2 I Composite video for WSS
54 D7 I/O Data bit for PP-RAM/SD-RAM 118 VSSA -- GND
55 D0 I/O Data bit for PP-RAM/SD-RAM 119 VDDA I 2.5V
56 D14 I/O Data bit for PP-RAM/SD-RAM 120 CVBS1B I Ground for CVBS1A
57 D8 I/O Data bit for PP-RAM/SD-RAM 121 CVBS1A I Composite video for Teletext decorder
58 D6 I/O Data bit for PP-RAM/SD-RAM 122 VSSA -- GND
59 D1 I/O Data bit for PP-RAM/SD-RAM 123 VDDA I 2.5V
60 VSS33 -- GND 124 P5.0 I AFT voltage for tuner
61 VDD33 I 3.3V 125 P5.1 -- Not used
62 D13 I/O Data bit for PP-RAM/SD-RAM 126 P5.2 I AGC voltage for tuner
63 D9 I/O Data bit for PP-RAM/SD-RAM 127 P5.3 -- Not used
64 D5 I/O Data bit for PP-RAM/SD-RAM 128 TMODE I Test mode

1-8 (No.YA063)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE [AV-28H4BU, AV-28H4SU, AV-32H4BU, AV-32H4SU]
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 13 screws [A] as shown in the Fig. 3.
(3) Withdraw the REAR COVER toward you.
3.1.2 REMOVING THE SIDE CONTROL JACK ASS'Y
• Remove the REAR COVER.
(1) Remove the 1 screw [B] as shown in the Fig.3.
(2) Slightly shift the SIDE CONTROL JACK ASS'Y to rear side
and remove the 2 claws under the SIDE CONTROL JACK
ASS'Y.
(3) Disconnect the connector [CN810F] and [CN810K] as
shown Fig. 3.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 2 screws [C] as shown in Fig. 3.
(2) Remove the 2 claws [D] from back side of the SIDE
CONTRL JACK ASS'Y as shown in Fig. 3.
(3) Pull out the SIDE CONTROL PWB.
3.1.4 REMOVING THE CHASSIS
• Remove the REAR COVER.
(1) Slightly raise the both sides of the chassis by hand and
remove the 2 claws under the both sides of the CHASSIS
from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
3.1.5 REMOVING THE POWER & DEF. PWB
• Remove the REAR COVER.
• Remove the CHASSIS.
(1) Remove the 3 screws [E] as shown in Fig. 3.
(2) Remove the POWER & DEF. PWB upper.
(If necessary, take off the wire clamp, connectors etc.)
3.1.6 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [F] as shown in the Fig. 3.
(2) Remove the 2 claws [G] under the CHASSIS as shown in
Fig. 2.
(3) Remove the AV TERMINAL BOARD slightly in the
direction of arrow [H] as shown in Fig. 2.
3.1.7 REMOVING THE SPEAKER GRIL
• Remove the REAR COVER.
(1) Remove the 8 screws [J] as show in the.Fig. 3.
(2) Remove the SPEAKER GRIL.
3.1.8 REMOVING THE SPEAKER
• Remove the REAR COVER.
• Remove the SPEAKER GRIL.
(1) Remove the 4 screws [K] as show in the.Fig. 1.
(2) Remove the SPEAKER.
(3) Follow the same steps when removing the other hand
SPEAKER.
3.1.9 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS. (Refer to REMOVING THE
CHASSIS).
(2) Erect the CHASSIS vertically with the HVT side facing up so
that you can easily check the back side of the PW board.
CAUTION:
• When erecting the 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.
3.1.10 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.
Fig.1
Fig.2
SPEAKER
FRONT CABINET
SPEAKER
K
AV JACK PWB
AV
TERMINAL
BOARD
G
H
G

(No.YA063)1-9
Fig.3
SPEAKER GRIL
FRONT CABINET
CRT SOCKET PWB
FRONT CONTROL PWB
POWER & DEF PWB
CONTROL
BASE
SIDE CONTROL JACK ASS'Y
E
F
J
D
C
A
C
B
REAR COVER
CHASSIS BASE
100Hz PWB
AV TERMINAL
BOARD
CLAW
CLAW
MAIN PWB
AV JACK PWB
POWER CORD
CN810K
CN810F

1-10 (No.YA063)
3.2 DISASSEMBLY PROCEDURE [AV-28H40SU, AV-28H77SK, AV-32H40SU, AV-32H47SU, AV-32H77SK]
3.2.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 13 screws [A] as shown in the Fig. 3.
(3) Withdraw the REAR COVER toward you.
3.2.2 REMOVING THE SIDE CONTROL JACK ASS’Y
• Remove the REAR COVER.
(1) Remove the 1 screw [B] as shown in the Fig.3.
(2) While slightly raise the SIDE CONTROL JACK ASSY,
remove the 2 claws under the SIDE CONTROL JACK
ASSY.
(3) Disconnect the connector [F] and [K] as shown in Fig. 1.
3.2.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 3 claws [C] from back side of the SIDE
CONTROL JACK ASSY as shown in Fig. 1.
(2) Pull out the SIDE CONTROL PWB.
3.2.4 REMOVING THE CHASSIS
• Remove the REAR COVER.
(1) Slightly raise the both sides of the chassis by hand and
remove the 2 claws under the both sides of the CHASSIS
from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
3.2.5 REMOVING THE POWER & DEF. PWB
• Remove the REAR COVER.
• Remove the CHASSIS.
(1) Remove the 3 screws [D] as shown in Fig. 3.
(2) Remove the POWER & DEF. PWB upper.
(If necessary, take off the wire clamp, connectors etc.)
3.2.6 REMOVING THE SIDE SPEAKER
• Remove the REAR COVER.
(1) Remove the 2 screws [E], and remove the SPEAKER
ADAPTER as shown in Fig. 3.
NOTE :
When removing the 2 screws [E] of the speaker holder
remove the lower side screw first, and then remove the
upper one.
(2) Remove the 4 screws [F] attaching the SPEAKER.
(3) Follow the same steps when removing the other hand
SPEAKER.
3.2.7 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [G] as shown in the Fig. 3.
(2) Remove the 2 claws [H] under the CHASSIS as shown in
Fig. 2.
(3) Remove the AV TERMINAL BOARD slightly in the
direction of arrow [I] as shown in Fig. 2.
3.2.8 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS. (Refer to REMOVING THE
CHASSIS).
(2) Erect the CHASSIS vertically so that you can easily check
the back side of the PW Board.
CAUTION:
• When erecting the 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.
3.2.9 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.
Fig.1
Fig.2
SIDE
CONTROL
PWB
F
K
(Back view)
C
C
AV JACK PWB
AV
TERMINAL
BOARD
H
I
H

(No.YA063)1-11
Fig.3
FRONT CABINET
CRT SOCKET
PWB SPEAKER
ADAPTER SPEAKER
( x 2)
( x 3)
( x 3)
( x 13)
FRONT
CONTROL
PWB POWER & DEF. PWB
CHASSIS BASE
MICOM
PWB
AV SW PWB
MAIN PWB
POWER CORD
AV TERMINAL
BOARD
REAR COVER
SIDE CONTROL JACK
ASS'Y
CLAW
CLAW
B
G
D
E
( x 4)
F
A

1-12 (No.YA063)
3.3 REMOVING THE CRT
NOTE:
• Replacement of the CRT should be performed by 2 or more
persons.
• After removing the REAR COVER, CHASSIS etc.,
(1) Putting the CRT change table on soft cloth, the CRT
change table should also be covered with such soft cloth
(shown in Fig. 4).
(2) While keeping the surface of CRT down, mount the TV set
on the CRT change table balanced will as shown in Fig. 4.
(3) Remove 4 screws marked by arrows with a box type
screwdriver as shown in Fig. 5.
NOTE:
Since the cabinet will drop when screws have been
removed, be sure to support the cabinet with hands.
(4) After 4 screws have been removed, put the cabinet slowly
on cloth (At this time, be carefully so as not to damage the
front
surface of the cabinet) shown in Fig. 6.
NOTE:
• The CRT should be assembled according to the
opposite sequence of its dismounting steps.
• The CRT change table should preferably be smaller
that the CRT surface, and its height be about 35cm.
Fig.4
Fig.5
Fig.6
COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.
Subsequent to replacement of the CRT and HV transformer or repair of the anode cap, etc. by dismounting them, be sure to coat
silicon grease for electrical insulation as shown in Fig.7.Wipe around the anode button with clean and dry cloth. (Fig.7)Coat silicon
grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode
button. (Fig.8)
Silicon grease product No. KS - 650N
Fig.7 Fig.8
CRT CHANGE TABLE
APPROX.
35cm
CLOTH
CRT
BOX
TYPE
SCREW
DRIVER
CRT
CHANGE
TABLE
CRT
CHANGE TABLE
CRT
CABINET
Anode button
CRT
Silicon grease
coating
Silicon grease
should be coated
by 5mm or more
from the outside
diameter of anode
cap.
Approx.
20mm (Do not
coat grease on
this section
Anode button
(No sticking of
silicon grease)
Anode cap
Coating position
of silicon grease

(No.YA063)1-13
3.4 MEMORY IC REPLACEMENT
• This model uses the memory IC.
• This memory IC stores data for proper operation of the video and drive circuits.
• When replacing, be sure to use an IC containing this (initial value) data.
3.4.1 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the
AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting
values.
3. Power on
Connect the power plug to the AC outlet and switch on the
power.
4. System constant check and setting
* It must not adjust without signal.
(1) Press the [INFORMATION] key and the [MUTING] key of
the REMOTE CONTROL UNIT simultaneously.
(2) The SERVICE MENU screen of Fig. 1 will be displayed.
(3) While the SERVICE MENU is displayed, press the
[INFORMATION] key and [MUTING] key simultaneously,
and the SYSTEM CONSTANT SET screen of Fig. 2 will
be displayed.
(4) Check the setting values of the SYSTEM CONSTANT
SET. If the value is different, select the setting item with
the [FUNCTION UP/DOWN] key, and set the correct val-
ue with the [FUNCTION -/+] key.
(5) Press the [MENU] key to memorize the setting value.
(6) Press the [INFORMATION] key twice, and return to the
normal screen.
5. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (Channels Preset) as described.
6. User settings
Check the user setting items according to the given in page
later.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
7. SERVICE MENU setting
Verify what to set in the SERVICE MENU, and set whatever is
necessary (Fig.1).
Refer to the SERVICE ADJUSTMENT for setting.
Fig.1
Fig.2
3.4.2 SYSTEM CONSTANT SETTING
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. STATUS
7. 8. SURROUND
9. SHIPPING (OFF) 0. BUS FREE
1-9 : SELECT i
i
: EXIT
SYSTEM CONSTANT SET
1. DESTINATION EU
- /+ : STORE i : EXIT
OK
Names of key
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
key
OK
NAME OF REMOTE CONTROL KEY
Setting item Setting content
Setting value
AV-28H4BU
AV-28H4SU
AV-28H40SU
AV-32H4BU
AV-32H4SU
AV-32H40SU
AV-32H47SU
AV-28H77SK AV-32H77SK
1.DESTINATION EU / EK / EI EU ←EK ←
2.CRT TYPE 16:9 / 4:3 16:9 ←←←
3.PICTURE TILT YES / NO NO YES NO YES
4.POWER BASS YES / NO NO ←←←
5.SPATIAL SURR YES / NO NO ←←←
6.PIC&TEXT YES / NO NO ←YES ←
7.PROGRESSIVE YES / NO NO ←←←

1-14 (No.YA063)
3.4.3 SETTINGS OF FACTORY SHIPMENT
3.4.3.1 BUTTON OPERATION 3.4.3.2 REMOTE CONTROL DIRECT OPERATION
3.4.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE SETTING
(2) PICTURE FEATURES
(3) SOUND SETTING
(4) EXT SETTING
(5) FEATURES
(6) INSTALL
Setting item Setting position
POWER Off
CHANNEL PR1
VOLUME 10
Setting item Setting position
CHANNEL PR1
VOLUME 10
ZOOM PANORAMIC
HYPER SOUND OFF
Setting item Setting position
PICTURE MODE STANDARD
CONTRAST / BRIGHT
SHARP / COLOUR / HUE
Refer to [5. VSM PRESET]
COLOUR TEMP COOL
Setting item Setting position
DIGITAL VNR AUTO
DigiPure Pro AUTO
COLOUR SYSTEM TV : According to preset CH
EXT : AUTO
4:3 AUTO ASPECT PANORAMIC
PICTURE TILT [32” model] MIDDLE
Setting item Setting position
STEREO / I•II Stereo sound
BASS Centre
TREBLE Centre
BALANCE Centre
HYPER SOUND OFF
Setting item Setting position
ID BLANK
S-IN BLANK
DUBBING EXT-1 →EXT-2
Setting item Setting position
SLEEP TIMER OFF
CHILD LOCK Refer to OPERATION
INSTRUCTIONS
BLUE BACK ON
DECODER (EXT-2) OFF
Setting item Setting position
LANGUAGE ENGLISH
AUTO PROGRAM TV channel automatically set
EDIT/MANUAL PRESET CH only
The others : BLANK

(No.YA063)1-15
3.4.4 SERVICE MENU SETING ITEMS
Setting item Setting value Setting item Setting value
1. IF 1. VCO
2. ATT ON/OFF
5. VSM PRESET BRIGHT/SOFT/STD COOL/WARM/NOMAL
1.CONT.
2.BRIGHT
3.SHARP
4.COLOUR
5.HUE
1.WDR R
2.WDR G
3.WDR B
2. V / C 1.RGB BLK
2.CUTOFF R
3.CUTOFF G
4.CUTOFF B
5.WDR R
6.WDR G
7.WDR B
8.BRIGHT
9.CONTRAST
10.COLOUR
11.HUE
12.SHARP
13.SC ADJ.
14.SIDE.P.L
15.SIDE.P.R
6.STATUS
(Do not adjust)
1.SOFT
2.TELETEXT
3.ASPECT
4.PROTECT
5.FLASH
3. AUDIO
(Do not adjust)
1.ERR LIMIT
2.A2 ID THR
3.SYSTEM
9.SHIPPING
(Do not adjust)
ON/OFF
4. DEF. 1.V-SHIFT
2.V-SIZE
3.H-CENT
4.H-SIZE
5.TRAPEZ
6.EW-PIN
7.COR-UP
8.COR-LO
9.COR-UP-S
10.COR-LO-S
11.ANGLE
12.BOW
13.V-S.CR
14.V-LIN

1-16 (No.YA063)
3.5 REPLACEMENT OF CHIP COMPONENT
3.5.1 CAUTIONS
(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.
3.5.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.
3.5.3 REPLACEMENT STEPS
1. How to remove Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove
the chip part.
NOTE :
After removing the part, remove remaining solder from the
pattern.
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

(No.YA063)1-17
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.
(2) The adjustment using the REMOTE CONTROL UNIT is
made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.
(3) Make sure that connection is correctly made AC to AC
power source.
(4) Turn on the power of the TV and measuring instruments for
warning up for at least 30 minutes before starting
adjustments.
(5) If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,
transformers and condensers) not shown in the adjustment
items of this service adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENT
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.
4.3 MEASURING INSTRUMENT AND FIXTURES
(1) DC voltmeter (or digital voltmeter)
(2) Oscilloscope
(3) Signal generator (Pattern generator)
[PAL / SECAM / NTSC]
(4) Remote control unit
4.4 ADJUSTMENT ITEMS
CHECK ITEM
• B1 POWERSUPPLY check
• HIGH VOLTAGE check
• IF VCO check
FOCUS
• FOCUS adjustment
DEFLECTION CIRCUIT
• V.POSITION adjustment
• V.SIZE adjustment
• H. POSITION adjustment
• H.SIZE adjustment
• SIDE-PIN adjustment
• TRAPEZIUM adjustment
• CORNER adjustment
• ANGLE adjustment
• BOW adjustment
• V.S-SHAPE CORRECTION & V.LINEARITY adjustment
VIDEO CIRCUIT
• WHITE BALANCE adjustment
• SUB BRIGHT adjustment
• SUB CONTRAST adjustment
• SUB COLOUR l adjustment
• SUB COLOUR ll adjustment
• SUB HUE l adjustment
• SUB HUE ll adjustment
VSM PRESET SETTING
• VSM PRESET setting
Item Preset value
PICTURE MODE STD
CONTRAST / BRIGHTSHARP / COLOUR / HUE Centre
COLOUR TEMP NORMAL
DIGITAL VNR AUTO
BASS / TREBLE / BALANCE Centre
HYPER SOUND OFF
ZOOM FULL
SLEEP TIMER OFF

1-18 (No.YA063)
4.5 ADJUSTMENT LOCATIONS
4.5.1 AV-28H4BU, AV-28H4SU, AV-32H4BU, AV-32H4SU
R
G
VM
TOP
CRT SOCKET PWB
TP-E
TP-47B
E1
(SOLDER SIDE)
SIDE CONTROL PWB
TOP
[SPEAKER]
POWER
SW
FRONT
POWER
LED
D8801
IC8851
F8901
W
PW
[POWER CORD]
FRONT
MAIN PWB POWER&DEF PWB
FRONT CONTROL PWB
SR SL
HV
KB
B
F
G
X
R
IC701
W
CN003
CN004
CN005
T551
HVT
1
5
1: TP-91(B1)
2: NC
3: X-ray1
4: X-ray2
5: TP-E
TUNER
AV JACK PWB
MICOM / 100Hz
PWB
F
K
CN001
CN002
FOCUS1
FOCUS2
SCREEN
28"MODEL 32"MODEL
FOCUS1
SCREEN

(No.YA063)1-19
4.5.2 AV-28H40SU, AV-28H77SK, AV-32H40SU, AV-32H47SU,AV-32H77SK
FRONT
TOP
F
K
POWER
SW FRONT
POWER
LED
D8801 IC8851
F8901
W
POWER CORD
B
TOP
R
G
VM
CRT SOCKET PWB
TP-E
TP-47B
E1
(SOLDER SIDE)
SIDE CONTROL PWB FRONT CONTROL PWB
[SPEAKER]
MAIN PWB
POWER&DEF PWB
SR SL
HV
KB
F
G
X
R
IC701
W
CN003
CN004
CN005
T551
HVT
1
5
1: TP-91(B1)
2: NC
3: X-ray1
4: X-ray2
5: TP-E
TUNER
AV JACK PWB
MICOM / 100Hz
PWB
CN001
CN002
28"MODEL 32"MODEL
FOCUS1
SCREEN
FOCUS1
FOCUS2
SCREEN

1-20 (No.YA063)
4.6 BASIC OPERATION OF SERVICE MENU
4.6.1 TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
4.6.2 SERVICE MENU ITEMS
With the SERVICE MENU, various adjustments can be made, and they are broadly classified in the following items of settings.
4.6.3 BASIC OPERATION OF SERVICE MENU
(1) HOW TO ENTER SERVICE MENU
Press the [INFORMATION] key and the [MUTING] key of the
REMOTE CONTROL UNIT simultaneously, and the SERVICE
MENU screen of Fig.1 will be displayed.
Fig.1
(2) SELECTION OF SUB MENU SCREEN
Press one of [1] - [5] keys of the REMOTE CONTROL UNIT
and select the SUB MENU SCREEN (See “SERVICE MENU
FLOW CHART”), form the SERVICE MENU.
Fig.2
(3) METHOD OF SETTING
z1.IF
[1.VCO] : It must not adjust without signal.
z2.V/C, 4.DEF AND 5.VSM PRESET.
z3.AUDIO, 6.STATUS, and 9.SHIPPING.
[Do not setting]
(4) RELEASE OF SERVICE MENU
After completing the setting, return to the SERVICE MENU, then again press the [INFORMATION] key.
1.IF This mode adjusts the setting values of the IF circuit.
2.V/C This mode adjusts the setting values of the VIDEO circuit.
3.AUDIO This mode adjusts the setting values of the MULTI-SOUND circuit. [Do not adjust]
4.DEF This mode adjusts the setting values of the DEFLECTION circuit.
5.VSM PRESET This mode adjusts the setting values of COOL, NORMAL and WARM. (VSM : Video Status Memory)
6.STATUS This mode is shows the monitor of SOFT, TELETEXT, ASPECT, PROTECT, FLASH. [Do not adjust]
9.SHIPPING (OFF) This mode is set at shipping. [Do not adjust]
0.BUS FREE This mode is set at bus free. [Do not adjust]
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. STATUS
7. 8.
9. SHIPPING (OFF) 0. BUS FREE
1-9 : SELECT i
i
: EXIT
Names of key
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
Key
OK
NAME OF REMOTE CONTROL KEY
Key Function
(1) [1] Select 1.IF
(2) [1] Select 1.VCO (CW)
Make sure that the arrow position between the ABOVE REF and BELOW REF.
(3) [INFORMATION] Return to the SERVICE MENU screen.
Key Function
(1) [2] / [4] / [5] Select one from 2.V/C, 4.DEF and 5.VSM PRESET.
(2) [FUNCTION UP / DOWN (/)] Select setting items.
(3) [FUNCTION -/+ (/)] Set (adjust) the setting values of the setting items.
(4) [OK] Memorize the setting value.(Before storing the setting values in memory, do not press
the CH, TV, POWER ON / OFF key if you do, the values will not be stored in memory.)
(5) [INFORMATION] Return to the SERVICE MENU screen.