JVC AV-28H5BU User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA263
2005/4
COLOUR TELEVISION
YA26320054
AV-28H5BU, AV-28H5BL, AV-28H5SK,
AV-28H5SL, AV28H5SR, AV-28H5SU,
AV-28H50SU, AV-32H5BU, AV-32H5SK,
AV-32H5SR, AV-32H5SU, AV-32H50SU,
AV-32H57SU
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
BASIC CHASSIS
ML3
1
4
7
2
5
8
0
3
6
9
P
AV
TV OK
MENU
P
TV
F.T/L
AV-28H5BU, AV-28H5BL
AV-28H5SK, AV-28H5SL
AV-28H5SR, AV-28H5SU
AV-32H5BU, AV-32H5SK
AV-32H5SR, AV-32H5SU
AV-28H50SU, AV-32H50SU AV-32H57SU

1-2 (No.YA263)
SPECIFICATION
Design & specifications are subject to change without notice.
Items
Contents
AV-28H5BU
AV-28H5BL
AV-28H5SU
AV-28H5SL
AV-28H50SU AV-28H5SK
AV-28H5SR
Dimensions ( W ×H ×D ) 76.2 cm ×52.8 cm ×49.2 cm 85.4 cm ×50.8 cm ×49.0 cm 76.2 cm ×52.8 cm ×49.2 cm
Mass 38.0 kg 39.0 kg 38.0 kg
TV RF System CCIR (B/G, I, D/K, L) CCIR (I)
Colour System PAL
SECAM
NTSC3.58 / NTSC4.43 (Only EXT mode)
PAL
NTSC3.58 / NTSC4.43 (Only EXT mode)
Stereo System A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Receiving
Frequency
VHF 47 MHz - 470 MHz [Except AV-28H5SK]
UHF 470 MHz - 862 MHz
French CATV 116 MHz - 172 MHz
220 MHz - 469 MHz
---
Intermediate
Frequency
VIF 38.9 MHz (B/G, I, D/K, L) 38.9 MHz (I)
SIF 33.4 MHz (5.5 MHz :B/G)
32.9 MHz ( 6.0 MHz:I )
32.4 MHz (6.5 MHz :L, D/K)
32.9 MHz ( 6.0 MHz:I )
Colour Sub
Carrier Frequency
PAL 4.43 MHz
SECAM 4.40625 MHz / 4.25 MHz ---
NTSC 3.58 MHz / 4.43 MHz
Teletext System TOP (German system)
FLOF (Fastext)
WST (Standard system)
Power Input AC220 V - AC240 V, 50 Hz
Power Consumption 120 W, Standby : 0.6 W 120 W, Standby : 2.5 W 120 W, Standby : 0.6 W
Picture Tube Visible size : 66 cm [measured diagonally (H : 58.3 cm ×V : 33.0 cm)
High Voltage 31.0 kV (+1 kV / -1.5 kV) (at zero beam current)
Speaker 13 cm ×6.5 cm oval type ×2
Audio Power Output 10 W + 10 W
Aerial Input Terminal 75 Ωunbalanced, coaxial
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 : 1 V(p-p) positive (negative sync, 75Ω)
C : 0.3 V(p-p) (Burst signal, 75Ω)
1 V(p-p) 75 Ω, RCA pin jack ×1
500 mV(rms) (-4 dBs), High impedance, RCA pin jack ×2
Audio output 0-1000 mV (rms), Low impedance, RCA pin jack ×2
Headphone Jack 3.5 mm stereo mini jack ×1
Remote Control Unit
RM-C1502 (AA/R6 dry cell battery × 2) [AV-28H5SU/AV-28H5SL/AV-28H5SK/AV-28H5SR/AV-28H50SU]
RM-C1502B (AA/R6 dry cell battery
× 2) [AV-28H5BU/AV-28H5BL]

(No.YA263)1-3
Design & specifications are subject to change without notice.
Items
Contents
AV-32H5BU
AV-32H5SU AV-32H50SU AV-32H57SU AV-32H5SK AV-32H5SR
Dimensions ( W ×H ×D )
86.4 cm × 58.7 cm × 55.0 cm 94.6 cm × 56.1 cm × 54.7 cm 94.8 cm × 56.2 cm × 55.0 cm 86.4 cm × 58.7 cm × 55.0 cm
Mass 53.0 kg 52.5 kg 53.0 kg
TV RF System CCIR (B/G, I, D/K, L) CCIR (I)
Colour System PAL
SECAM
NTSC3.58 / NTSC4.43 (Only EXT mode)
PAL
NTSC3.58 / NTSC4.43
(Only EXT mode)
Stereo System A2 (B/G, D/K)
NICAM (B/G, I, D/K, L)
NICAM (I)
Receiving
Frequency
VHF 47 MHz - 470 MHz [Except AV-32H5SK]
UHF 470 MHz - 862 MHz
French CATV 116 MHz - 172 MHz
220 MHz - 469 MHz
---
Intermediate
Frequency
VIF 38.9 MHz (B/G, I, D/K, L) 38.9 MHz (I)
SIF
33.4 MHz (5.5 MHz :B/G)
32.9 MHz ( 6.0 MHz:I )
32.4 MHz (6.5 MHz :L, D/K)
32.9 MHz ( 6.0 MHz:I )
Colour Sub
Carrier Frequency
PAL 4.43 MHz
SECAM 4.40625 MHz / 4.25 MHz ---
NTSC 3.58 MHz / 4.43 MHz
Teletext System TOP (German system)
FLOF (Fastext)
WST (Standard system)
Power Input AC220 V - AC240 V, 50 Hz
Power Consumption 130 W, Standby : 0.6 W 130 W, Standby : 2.5 W 130 W, Standby : 2.5 W 130 W, Standby : 0.6 W
Picture Tube Visible size : 76 cm [measured diagonally] (H : 67.4 cm ×V : 38.4 cm)
High Voltage 31.0 kV (+1 kV / -1.5 kV) (at zero beam current)
Speaker 13 cm ×6.5 cm oval type ×2
Audio Power Output 10 W + 10 W
Aerial Input Terminal 75 Ωunbalanced, coaxial
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 : 1 V(p-p) positive (negative sync, 75Ω)
C : 0.3 V(p-p) (Burst signal, 75Ω)
1 V(p-p) 75 Ω, RCA pin jack ×1
500 mV(rms) (-4 dBs), High impedance, RCA pin jack ×2
Audio output 0-1000 mV (rms), Low impedance, RCA pin jack ×2
Headphone Jack 3.5 mm stereo mini jack ×1
Remote Control Unit
RM-C1502 (AA/R6 dry cell battery × 2) [AV-32H5SU/AV-32H5SK/AV-32H5SR/AV-32H50SU/AV-32H57SU]
RM-C1502B (AA/R6 dry cell battery
× 2) [AV-32H5BU]

1-4 (No.YA263)
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.YA263)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.YA263)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
ZOOM
This function can change the screen size according to the
picture aspect ratio.
PICTURE MODE
This function can adjust the picture settings automatically.
T-V LINK
When you have a T-V LINK compatible VCR connected to the
EXT-2 Terminal on the TV,it is easier to set up the VCR and to
view videos.
DIGITAL VNR
This function cuts down the amount of noise in the original
picture.
HYPER SOUND
You can enjoy sounds with a wider ambience.
2.2 MAIN DIFFERENCE LIST
Item AV-28H5BU AV-28H5BL AV-28H5SK AV-28H5SL AV28H5SR AV-28H5SU AV-28H50SU
CABINET COLOUR BLACK ←SILVER ←←←←
RF SYSTEM PAL,SECAM ←PAL PAL,SECAM PAL PAL,SECAM ←
BROADCASTING SYSTEM B/G, D/K, I, L ←I B/G, D/K, I, L I B/G, D/K, I, L ←
REMOTE CONTROL UNIT RM-C1502B ←RM-C1502 ←←←←
MAIN PWB
SML-1302A-U2 ← SML-1932A-U2 SML-1302A-U2 ←←←
POWER & DEF PWB
SML-2302A-S2 ←←← SML-2302A-U2 SML-2302A-S2 ←
CRT SOCKET PWB
SML-3302A-U2 ←←←←←←
SIDE CONTROL PWB
SML-8131A-U2 ←←←←← SML-8133A-U2
FRONT CONTORL PWB SML-8301A-U2 ←←←←← SML-8302A-U2
AV JACK PWB SML0J301A-U2 ←←←←←←
100HZ PWB
SML0Z301A-U2 ←←←←←←
Item AV-32H5BU AV-32H5SK AV-32H5SR AV-32H5SU AV-32H50SU AV-32H57SU
CABINET COLOUR BLACK SILVER ←←←←
RF SYSTEM PAL,SECAM PAL ←PAL,SECAM ←←
BROADCASTING SYSTEM B/G, D/K, I, L I ←B/G, D/K, I, L ←←
REMOTE CONTROL UNIT RM-C1502B RM-C1502 ←←←←
MAIN PWB
SML-1301A-U2 SML-1931A-U2 SML-1301A-U2 ←←←
POWER & DEF PWB
SML-2301A-S2 ← SML-2301A-U2 SML-2301A-S2 ← SML-2301A-U2
CRT SOCKET PWB SML-3301A-U2 ←←←←←
SIDE CONTROL PWB
SML-8131A-U2 ←←← SML-8133A-U2 ←
FRONT CONTORL PWB
SML-8301A-U2 ←←← SML-8302A-U2 ←
AV JACK PWB
SML0J301A-U2 ←←←←←
100HZ PWB
SML0Z301A-U2 ←←←←←

(No.YA263)1-7
2.3 21-PIN EURO CONNECTOR (SCART) : EXT-1/EXT-2/EXT-3
(P-P= Peak to Peak, B-W= Blanking to white peak)
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
4AUDIOGND UsedUsedUsed
5 GND (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
9 GND (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
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]

1-8 (No.YA263)
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 D1 I/O Data bit for SRAM 51 NC -- Not used
2 D4 I/O Data bit for SRAM 52 XTAL2 I System clock (6MHz)
3 D2 I/O Data bit for SRAM 53 XTAL1 O System clock (6MHz)
4 D3 I/O Data bit for SRAM 54 NC -- Not used
5 XROM I External ROM access (Enable: L) 55 VSSA -- GND
6 VDD25 I 2.5V 56 VDDA25 I 2.5V
7 VSS25 -- GND 57 R O Red for OSD / Teletext
8 VDD33 I 3.3V 58 G O Green for OSD / Teletext
9 P0.0 O I2C bus clock for E2PROM 59 B O Blue for OSD / Teletext
10 P0.1 I/O I2C bus data for E2PROM 60 BLANK/COR O Output for blanking and contrast reduction
11 P0.2 O I2C bus clock for generally 61 NC -- Not used
12 P0.3 I/O I2C bus data for generally 62 P1.7 O Not used
13 P0.4 O Not used 63 NC -- Not used
14 P0.5 O Not used 64 WR O External memory write strobe for SRAM
15 P0.6 O Audio muting (Muting: H) 65 RD O External memory read strobe for SRAM
16 P0.7 O Power on/off control (ON: L) 66 NC -- Not used
17 ENE I Not used 67 A19 O Address bit for SRAM
18 STOP I Not used 68 A18 O Address bit for SRAM
19 OCF I Not used 69 A17 O Address bit for SRAM
20 EXTIF I Extended memory interface (Enable: L) 70 A16 O Address bit for SRAM
21 CVBS I Composite video signal input 71 A15 O Address bit for SRAM
22 VDDA25 I 2.5V 72 FL_RGM I Not used
23 VSSA -- GND 73 VDD25 I 2.5V
24 P2.0 I AFC voltage from tuner 74 VSS -- GND
25 P2.1 I Key scan from front control CH+ CH- MENU 75 VDD33 I 3.3V
26 P2.2 I AGC voltage from tuner 76 A14 O Address bit for SRAM
27 P2.3 O Not used 77 A12 O Address bit for SRAM
28 NC -- Not used 78 A13 O Address bit for SRAM
29 HS/SSC I Horizontal sync 79 A7 O Address bit for SRAM
30 VS I Vertical sync 80 FL_RST I Not used
31 P3.0 O Not used 81 A8 O Address bit for SRAM
32 P3.1 O Not used 82 A6 O Address bit for SRAM
33 P3.2 I Remote control 83 A9 O Address bit for SRAM
34 P3.3 I Receive data from TV_LINK 84 A5 O Address bit for SRAM
35 P3.4 O DDP reset (Reset: H) 85 A11 O Address bit for SRAM
36 P3.5 I
X-ray HB LB EW correction Protection detection (Normal: H) 86 A4 O Address bit for SRAM
37 P3.6 I/O Not used 87 ALE O Enable for address latch
38 P3.7 I Not used 88 PSEN O Enable for program store
39 VSS -- GND 89 A3 O Address bit for SRAM
40 VDD33 I 3.3V 90 A10 O Address bit for SRAM
41 P1.0 O Not used 91 VSS -- GND
42 P1.1 O Not used 92 VDD33 I 3.3V
43 P1.2 O Not used 93 A2 O Address bit for SRAM
44 P1.3 O Output data for TV_LINK 94 A1 O Address bit for SRAM
45 P1.4 O MSP reset (Reset: H) 95 FL_CE I Not used
46 P1.5 O Not used 96 D7 I/O Data bit for SRAM
47 P1.6 O Power indication control (ON: L) 97 A0 O Address bit for SRAM
48 P4.2 O Not used 98 D6 I/O Data bit for SRAM
49 P4.3 O Not used 99 D0 I/O Data bit for SRAM
50 RST I Reset for main CPU 100 D5 I/O Data bit for SRAM

(No.YA263)1-9
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE [H5 series]
3.1.1 REMOVING THE REAR COVER
(1) Remove the 13 screws [A], then 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] and 1 claw, then remove the SIDE
CONTROL JACK ASS’Y.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASS'Y.
(1) Remove the 2 screws [C], then remove the SIDE
CONTROL PWB.
3.1.4 REMOVING THE CHASSIS BASE
• 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
BASE from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
3.1.5 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [D].
(2) Remove the 2 claws under the CHASSIS, then remove the
AV TERMINAL BOARD.
3.1.6 REMOVING THE SPEAKER
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASS'Y.
• Remove the CHASSIS BASE.
(1) Remove the 4 screws [E], then remove the SPEAKER.
(2) Follow the same steps when removing the other hand
SPEAKER.
3.1.7 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS BASE. (Refer to REMOVING THE
CHASSIS BASE).
(2) Erect the CHASSIS BASE 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 BASE, 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 PWB.
3.1.8 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.

1-10 (No.YA263)
Fig.1
CONTROL BASE
FRONT CONTROL PWB
MAIN PWB
CHASSIS BASE
AV JACK PWB
POWER CORD
POWER & DEF PWB
AV TERMINAL
BOARD
Claw
Claw
Claw
Claw
REAR COVER
SIDE CONTROL BASE
SIDE CONTROL JACK ASS'Y
SIDE CONTROL PWB
CRT SOCKET PWB
SPEAKER
SPEAKER
A
B
C
E
D
D
E
100Hz PWB

(No.YA263)1-11
3.2 DISASSEMBLY PROCEDURE [H50/H57 series]
3.2.1 REMOVING THE REAR COVER
(1) Remove the 13 screws [A], then 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], then remove the SIDE
CONTROL JACK ASS’Y.
3.2.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASS'Y.
(1) Remove the 2 claws, then remove the SIDE CONTROL
PWB.
3.2.4 REMOVING THE CHASSIS BASE
• 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
BASE from the front cabinet.
(2) Withdraw the CHASSIS backward.
(If necessary, take off the wire clamp, connectors etc.)
3.2.5 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 3 screws [C].
(2) Remove the 2 claws under the CHASSIS, then remove the
AV TERMINAL BOARD.
3.2.6 REMOVING THE SPEAKER
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASS'Y.
• Remove the CHASSIS BASE.
(1) Remove the 2 screws [D], then remove the SPEAKER with
SPEAKER ADAPTER.
(2) Remove the 4 screws [E], then remove the SPEAKER from
SPEAKER ADAPTER.
(3) Follow the same steps when removing the other hand
SPEAKER.
3.2.7 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the CHASSIS BASE. (Refer to REMOVING THE
CHASSIS BASE).
(2) Erect the CHASSIS BASE 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 BASE, 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 PWB.
3.2.8 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.

1-12 (No.YA263)
Fig.1
Claw
Claw
Claw
E
E
D
B
C
MAIN PWB
AV JACK PWB
POWER CORD
POWER & DEF PWB
CRT SOCKET PWB
100Hz PWB
SPEAKER
SPEAKER
ADAPTER
SIDE CONTROL BASE
CONTROL BASE
FRONT CONTROL PWB
SIDE CONTROL PWB
REAR COVER
A
CHASSIS BASE
AV TERMINAL BOARD

(No.YA263)1-13
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. 2).
(2) While keeping the surface of CRT down, mount the TV set
on the CRT change table balanced will as shown in Fig. 2.
(3) Remove 4 screws marked by arrows with a box type screw-
driver as shown in Fig. 3.
NOTE:
Since the cabinet will drop when screws have been re-
moved, 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. 4.
NOTE:
• The CRT should be assembled according to the oppo-
site sequence of its dismounting steps.
• The CRT change table should preferably be smaller
that the CRT surface, and its height be about 35cm.
Fig.2
Fig.3
Fig.4
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.5.Wipe around the anode button with clean and dry cloth. (Fig.5)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 but-
ton. (Fig.6)
Silicon grease product No. KS - 650N
Fig.5 Fig.6
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

1-14 (No.YA263)
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 will be displayed (Fig. 1).
(3) While the SERVICE MENU is displayed, press the
[INFORMATION] key and [MUTING] key simultaneously,
and the SYSTEM CONSTANT SET screen will be
displayed (Fig. 2).
(4) Check the setting values of the SYSTEM CONSTANT
SET. If the value is different, select the setting item with
the [FUNCTION / ]key, and set the correct value
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 MODE setting
Verify what to set in the SERVICE MODE, 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. SHIPPING (OFF)
1-7 : SELECT i
i
: EXIT
SYSTEM CONSTANT SET
1. DESTINATION EU
- /+ : STORE i : EXIT
OK
1
4
7
2
5
8
0
3
6
9
P
AV
TV OK
MENU
P
TV
F
.T/L
INFORMATION
MUTING
MENU
FUNCTION
/
FUNCTION
/
Setting item Setting content
Setting value
AV-28H5BU
AV-28H5SU
AV-32H5BU
AV-32H5SU
AV-28H5BL AV-28H5SK
AV-32H5SK AV-28H5SL AV-28H5SR
AV-32H5SR
AV-28H50SU
AV-32H50SU
AV-32H57SU
1.DESTINATION EU / EK / EI EU EU EK EU EI EU
2.CRT TYPE 16 : 9 / 4 : 3 16 : 9 16 : 9 16 : 9 16 : 9 16 : 9 16 : 9
3.PICTURE TILT YES / NO YES YES YES YES YES YES
4.POWER BASS YES / NO NO NO NO NO NO NO
5.SPATIAL SURR YES / NO NO NO NO NO NO NO
6.PIC&TEXT YES / NO NO NO NO NO NO NO
7.PROGRESSIVE YES / NO NO NO NO NO NO NO

(No.YA263)1-15
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
(7) VSM PRESET TABLE
Setting item Setting position
POWER Off
CHANNEL PR1
VOLUME 10
Setting item Setting position
CHANNEL PR1
VOLUME 10
ZOOM PANORAMIC
Setting item Setting position
PICTURE MODE BRIGHT
COLOUR TEMP COOL
Setting item Setting position
DIGITAL VNR AUTO
COLOUR SYSTEM TV : According to preset CH
EXT : AUTO
4:3 AUTO ASPECT PANORAMIC
PICTURE TILT Middle
Setting item Setting position
STEREO / I•II Stereo sound
BASS -5 [H5 series]
Centre [H50 / H57 series]
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 OFF
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
Item Variable
range
Setting value
PICTURE MODE COLOUR TEMP.
BRIGHT STANDARD SOFT COOL NORMAL WARM
1.BRIGHT -16~+16 0 0 0 --- --- ---
2.CONT -16~+16 +7 0 -3 --- --- ---
3.COLOUR -16~+16 0 0 0 --- --- ---
4.SHARP -16~+16 0 0 -2 --- --- ---
5.HUE -16~+16 0 0 0 --- --- ---
1.WDR R -64~+63 --- --- --- -15 0 +4
2.WDR G -64~+63 --- --- --- -9 0 0
3.WDR B -64~+63 --- --- --- 0 0 0

1-16 (No.YA263)
3.4.4 SERVICE MODE SETING ITEMS
Setting item Setting value Setting item Setting value
1. IF 1. VCO 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
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.CONT.
10.COLOUR
11.HUE
12.SHARP
13.SC ADJ
14.SIDE.P.L
15.SIDE.P.R
5. VSM PRESET BRIGHT/SOFT/STANDARD
1. BRIGHT
2. CONT
3. COLOUR
4. SHARP
5. HUE
COOL/WARM/NORMAL
1. WDR R
2. WDR G
3. WDR B
3. AUDIO
[Do not adjust]
1.ERROR LIMIT
2.A2 ID THR
3.Q-PEAK
4.SOUND LEVEL
6. STATUS
[Do not adjust]
---
7.SHIPPING (OFF)
[Do not adjust]
---

(No.YA263)1-17
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

1-18 (No.YA263)
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
warming 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 VOLTAGE 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 adjustment
• SUB HUE adjustment
VSM PRESET SETTING
• VSM PRESET setting
Item Preset value
PICTURE MODE STANDARD
CONTRAST / BRIGHT / SHARP / COLOUR / HUE Centre
COLOUR TEMP NORMAL
DIGITAL VNR AUTO
BASS / TREBLE / BALANCE Centre
HYPER SOUND OFF
ZOOM FULL
SLEEP TIMER OFF

(No.YA263)1-19
4.5 ADJUSTMENT LOCATIONS [H5 series]
HVT
HVT
FOCUS
X
KS
SL
SR
F
B
R
R
G
K
S
F
B
W
W
HV
SCREEN
G
CN003
CN004
CN005
CN003
CN004
CN005
MAIN PWB
100Hz PWB
CN001
CN002
AV JACK PWB
POWER & DEF PWB
PW
DEG
TUNER
FRONT
FRONT
FRONT FRONT
TOP
CRT SOCKET PWB (SOLDER SIDE)
FRONT CONTROL PWB
SIDE CONTROL PWB
POWER CORD
1 : TP-91(B1)
2 : NC
3 : X-RAY1
4 : X-RAY2
5 : TP-E ( )
DEF. YOKE
DEG COIL
TP-E TP-47B
1
5
SPEAKER(R)
SPEAKER(L)

1-20 (No.YA263)
4.6 ADJUSTMENT LOCATIONS [H50/H57 series]
HVT
HVT
FOCUS
X
KS
SL
SR
F
B
R
R
G
K
S
F
B
W
W
HV
SCREEN
G
CN003
CN004
CN005
CN003
CN004
CN005
MAIN PWB
100Hz PWB
CN001
CN002
AV JACK PWB
POWER & DEF PWB
PW
DEG
TUNER
FRONT
FRONT FRONT
TOP
CRT SOCKET PWB (SOLDER SIDE)
FRONT CONTROL PWB
SIDE CONTROL PWB
POWER CORD
1 : TP-91(B1)
2 : NC
3 : X-RAY1
4 : X-RAY2
5 : TP-E
( )
DEF. YOKE
DEG COIL
TP-E TP-47B
1
5
SPEAKER(R)
SPEAKER(L)