JVC AV-28R4SK User manual

SERVICE MANUAL
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED No.YA060
2004/3
COLOUR TELEVISION
YA06020043AV-28R4SK, AV-28T4BK, AV-28T4SK,
AV-28T4SP, AV-28T4BR, AV-28T4SR,
AV-28T77SK, AV-32R4SK, AV-32T4SK,
AV-32T4SP, AV-32T4SR, AV-32T77SK
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
BASIC CHASSIS
JW
AV-28T77SK
AV-32T77SK
1
4
7
2
5
8
0
3
6
9
P
AV
TV OK
MENU
P
TV
F
.T/L
AV-28R4SK, AV-28T4BK, AV-28T4SK,
AV-28T4SP, AV-28T4BR, AV-28T4SR,
AV-32R4SK, AV-32T4SK, AV-32T4SP,
AV-32T4SR

1-2 (No.YA060)
SPECIFICATION
Design & specifications are subject to change without notice.
Items
Contents
AV-28R4SK
AV-28T4SK
AV-28T4BK
AV-28T4SR
AV-28T4BR
AV-28T77SK
AV-28T4SP
Dimensions ( W ×H ×D ) 85.4cm ×50.8cm ×49.7cm 85.4cm ×50.7cm ×49.7cm
85.4cm ×50.7cm ×48.9cm
[AV-28T77SK]
85.4cm ×50.8cm ×49.3cm
Mass 42.0kg 42.0kg
39.0kg [AV-28T77SK]
39.0kg
TV RF System CCIR ( I ) CCIR (B/G, I, L)
Colour System PAL
NTSC3.58 / NTSC4.43 (Only EXT mode)
PAL
SECAM
NTSC3.58 / NTSC4.43 (Only EXT mode)
Stereo System NICAM ( I ) A2 (B/G)
NICAM (B/G, I, L)
Receiving
Frequency
VHF --- 47MHz - 470MHz
UHF 470MHz - 862MHz
French CATV --- 116MHz - 172MHz
220MHz - 469MHz
Intermediate
Frequency
VIF 38.9MHz ( I ) 38.9MHz (B/G, I, L)
33.9MHz (L')
SIF 32.9MHz (6.0MHz :I) 33.4MHz (5.5MHz :B/G)
32.9MHz ( 6.0MHz:I )
32.4MHz (6.5MHz :L)
Colour Sub
Carrier Frequency
PAL 4.43MHz
SECAM --- 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHz
Teletext System FLOF (Fastext level 2.5)
WST(Standard system)
TOP (German system)
FLOF (Fastext level 2.5 720P)
WST (Standard system)
Power Input AC 220V~AC240V, 50Hz
Power Consumption 125W(Max) / 115W(Avg)
Standby : 2.7W
120W(Max) / 110W(Avg)
Standby : 2.7W
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 MAIN : 6.5cm ×13cm oval type ×2
CENTER : 4cm ×16cm oval type ×2
SUB WOOFER : 13cm round type ×1
6.5cm ×13cm oval type ×2
Audio Power Output MAIN : 10W + 10W
CENTER : 10W
SUB WOOFER : 18W
10W + 10W
Aerial Input Terminal 75 Ωunbalanced, coaxial
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector (SCART socket ×3)
EXT-4 S-Video Mini-DIN 4-pin ×1
Y : 1V(p-p) positive, negative sync 75Ω
C : 0.286V(p-p) (burst signal) 75Ω
---
Video 1V(p-p) positive, negative sync provided, 75Ω, RCA pin jack ×1
Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack ×2
Audio Out (variable) 0 - 1000V(rms), low impedance, RCA pin jack ×2
Surround Rear Terminal 7.5W + 7.5W, 8 Ω---
Headphone Jack Stereo mini jack, Ø3.5mm ×1
Remote Control Unit RM-C1502-1C
(AA/R6 dry cell battery ×2)
RM-C1502-1C (Silver)
RM-C1502B-1C (Black)
(AA/R6 dry cell battery ×2)
RM-C1502-1C
(AA/R6 dry cell battery ×2)
This product is manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
[AV-28R4SK]

(No.YA060)1-3
Design & specifications are subject to change without notice.
Items
Contents
AV-32R4SK
AV-32T4SK
AV-32T4SR
AV-32T77SK
AV-32T4SP
Dimensions ( W ×H ×D ) 94.8cm ×56.2cm ×55.4cm 94.8cm ×56.2cm ×55.4cm
94.6cm ×56.2cm ×54.7cm
[AV-32T77SK]
94.8cm ×56.2cm ×55.0cm
Mass 56.0kg 56.0kg
53.0kg [AV-32T77SK]
53.0kg
TV RF System CCIR ( I ) CCIR (B/G, I, L)
Colour System PAL
NTSC3.58 / NTSC4.43 (Only EXT mode)
PAL
SECAM
NTSC3.58 / NTSC4.43 (Only EXT mode)
Stereo System NICAM ( I ) A2 (B/G)
NICAM (B/G, I, L)
Receiving
Frequency
VHF --- 47MHz - 470MHz
UHF 470MHz - 862MHz
French CATV --- 116MHz - 172MHz
220MHz - 469MHz
Intermediate
Frequency
VIF 38.9MHz ( I ) 38.9MHz (B/G, I, L)
33.9MHz (L')
SIF 32.9MHz (6.0MHz :I) 33.4MHz (5.5MHz :B/G)
32.9MHz ( 6.0MHz:I )
32.4MHz (6.5MHz :L)
Colour Sub
Carrier Frequency
PAL 4.43MHz
SECAM --- 4.40625MHz / 4.25MHz
NTSC 3.58MHz / 4.43MHz
Teletext System FLOF (Fastext level 2.5)
WST(Standard system)
TOP (German system)
FLOF (Fastext level 2.5 720P)
WST (Standard system)
Power Input AC 220V~AC240V, 50Hz
Power Consumption 125W(Max) / 115W(Avg)
Standby : 2.7W
120W(Max) / 110W(Avg)
Standby : 2.7W
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 MAIN : 6.5cm ×13cm oval type ×2
CENTER : 4cm ×16cm oval type ×2
SUB WOOFER : 13cm round type ×1
6.5cm ×13cm oval type ×2
Audio Power Output MAIN : 10W + 10W
CENTER : 10W
SUB WOOFER : 18W
10W + 10W
Aerial Input Terminal 75 Ωunbalanced, coaxial
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector (SCART socket ×3)
EXT-4 S-Video Mini-DIN 4-pin ×1
Y : 1V(p-p) positive, negative sync 75Ω
C : 0.286V(p-p) (burst signal) 75Ω
---
Video 1V(p-p) positive, negative sync provided, 75Ω, RCA pin jack ×1
Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack ×2
Audio Out (variable) 0 - 1000V(rms), low impedance, RCA pin jack ×2
Surround Rear Terminal 7.5W + 7.5W, 8 Ω---
Headphone Jack Stereo mini jack (Ø3.5mm ×1)
Remote Control Unit RM-C1502-1C (AA/R6 dry cell battery ×2)
This product is manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
[AV-32R4SK]

1-4 (No.YA060)
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.YA060)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.YA060)
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.
2.2 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
4 AUDIO GND Used Used Used
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]

(No.YA060)1-7
2.3 MAIN DIFFERENCE LIST
CABINET TYPE
Item AV-28R4SK AV-28T4SK AV-28T4BK AV-28T4SR AV-28T4BR AV-28T77SK AV-28T4SP
CABINET TYPE A ←←←←BA
CABINET COLOUR Silver ←Black Silver Black Silver Silver
DESTINATION England England England Ireland Ireland England Germany
Belgium
France
Switzerand
Austria
Italy
Spain
Portugal
Sweden
Denmark
Finland
Norway
Greece
DOLBY SORROUND YES NO ←←←←←
SUB WOOFER YES NO ←←←←←
POWER PLUG UK type(3pin) ←←←←←EU type(2pin)
S VIDEO INPUT YES ←←←←←NO
Item AV-32R4SK AV-32T4SK AV-32T4SR AV-32T77SK AV-32T4SP
CABINET TYPE A ←←BA
DESTINATION England England Ireland England Germany
Belgium
France
Switzerand
Austria
Italy
Spain
Portugal
Sweden
Denmark
Finland
Norway
Greece
DOLBY SORROUND YES NO ←←←
SUB WOOFER YES NO ←←←
POWER PLUG UK type(3pin) ←←←EU type(2pin)
S VIDEO INPUT YES ←←←NO
B typeA type

1-8 (No.YA060)
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 VssP2 -- GND 65 SVM O SVM output
2 VssC4 -- GND 66 FbiSo I/O Flyback input/SC output
3 V1.8C4 -- 1.8VD 67 Hout O H output
4 V3.3A3 -- 3.3V 68 VssComb -- GND for comb filter
5 VrefP_Sdac -- 3.3V 69 V5Comb -- 5V for comb filter
6 VrefN_Sdac -- 0V 70 Vin/R2/Pr I V-input for YUV
7 VrefP_Sdac -- 3.3V 71 Uin/B2/Pb I U-input for YUV
8 VrefN_Sdac -- 0V 72 Yin/G2/Y I Y-input for YUV
9 VrefP_Sdac -- 3.3V 73 Ysync I Y-input for SyncSep
10 XtalIn I XTALIN 74 Yout O Y-out
11 XtalOut O XTALOUT 75 Uout/INSSW2 I/O U-out (2nd RGB/YPbPr insertion input)
12 VssA1 -- GND 76 Vout/Swo1 O NC
13 Vguard/Swo I/O VGUARD or I/O switch 77 INSSW3 I 3rd RGB/YPbPr insertion
14 DecDig -- Decoupling Digital Supply 78 R3/Pr I 3rd R in/Pr in
15 V5P1 -- 1st Supply 5V 79 G3/Y I 3rd G in/Y in
16 Phi2 -- Phase-2 filter 80 B3/Pb I 3rd B in/Pb in
17 Phi1 -- Phase-1 filter 81 Gnd3 -- GND3
18 Gnd1 -- GND1 82 V5P3 -- 3rd supply
19 SecPll -- SECAM PLL Decoupling 83 BCL I BCL input
20 Dec8G -- Bandgap decoupling 84 BLKIN I Black current input
21 Ewd/Avl O E/W Drive or AVL cap. 85 Rout O Red output
22 Vdb O V. Drive B output 86 Gout O Green output
23 Vda O V. Drive A output 87 Bout O Blue output
24 Vif1 I IF input 1 88 V3.3A1 -- 3.3V analog
25 Vif2 I IF input 2 89 RefAdN -- Negative ref. voltage
26 Vsc -- Vertical sawtooth cap. 90 V3.3RefAdP -- Positive ref. voltage
27 Iref I Ref. current input 91 RefAd -- Reference voltage for ADC
28 GndIF -- GND IF 92 GndA -- GND
29 Sif1 I SIF input 1 / DVB input 1 93 V1.8A I Supply for ADC
30 Sif2 I SIF input 2 / DVB input 2 94 V3.3A2 I Supply for SDAC
31 Agc O Tu AGC output 95 VssADC -- GND for Temp. sensor
32 EHT I EHT/overvoltage protect 96 V1.8ADC -- Supply video ADC
33 Ssif/RefIn/Avl/RefOut O L/OTHER 97 IntO I REMOCON
34 AudioIn5L I Audio 5 input (Left) 98 P10/Int1 I AV_LINK IN
35 AudioIn5R I Audio 5 input (Right) 99 P11/TO O AV_LINK OUT
36 AudOutSL O Audio output (Left) 100 V1.8C2 -- digital 1.8V
37 AudOutSR O Audio output (Right) 101 VssC2 -- GND
38 DecsDem -- decoupling sound demod. 102 P04/I2SWs I/O (I2S_WS)
39 QssO/AmO/AudeEm O QSSO/AMout/deemphasis 103 P03/I2SClk I/O (I2S_CLK)
40 Gnd2 -- GND2 104 P02/I2SDo2 O L/R_OTH (I2S_Dout2)
41 PllIf -- IF PLL loop filter 105 P01/I2SDo1 O D/A_RST (I2S_Dout1)
42 SifAgc -- AGC SIF / int-extAGCforDVB 106 P00/I2SDI1 I H/P DET
43 IfVo/FmRo/DvbO O DVBout/IFvideo/FMout 107 P13/T1 O POWER
44 FmRo/DvbO O DVBout/FMout 108 SCL1 I/O SCL1
45 V8AudioSwitches -- 8V for Audio SW. 109 SDA1 I/O SDA1
46 AgcSsif -- AGC cap.2nd SIF 110 V3.3P -- 3.3V
47 V5P2 -- 2nd supply 5V 111 P20/TPwm O ROTATION (or N/S CANCEL)
48 SVO/IfVo/Cvbsl I/O IF vout/selCVBSo/CVBSin 112 P21/Pwm0 O (N/S_CEN/OTH)
49 Audio4InL I Audio 4 input (Left) 113 P22/Pwm1 O A_MUTE
50 Audio4InR I Audio 4 input (Right) 114 P23/Pwm2 O AMP_MUTE
51 Y4/Cvbs4 I CVBS4/Y4 input 115 P30/Adc0 I PROTECT
52 C4 I Chroma-4 input 116 P31/Adc1 O LED
53 Audio2InL I Audio 2 input (Left) 117 V1.8C1 -- 1.8V digital
54 Audio2InR I Audio 2 input (Right) 118 DecV1V8 -- Decoupling 1.8V
55 Cvbs2/Y I CVBS2/Y2 input 119 P32/Adc2 I KEY input
56 Audio3InL I Audio 3 input (Left) 120 P33/Adc3 I AGC input (ECO)
57 Audio3InR I Audio 3 input (Right) 121 VssC1+P1 I Digital GND m controller
58 Y3/Cvbs I CVBS3/Y3 input 122 P24/PWM3 O NC(SAW_SW)
59 C3 I Chroma-2/3 input 123 P25/PWM4 O RES_OUT
60 AudOutLsL I Audio output for AMP 124 V1.8C3 -- 1.8V digital
61 AudOutLsR I Audio output for AMP 125 VssC3 -- GND
62 AudOutHpL I HP L Audio output 126 P12/Int2 I POW_DET
63 AudOutHpR I HP-R Audio ouput 127 P14/RX I/O SDA0
64 CVBSO/PIP I/O CVBS/PIP output 128 P15/TX I/O SCL0

(No.YA060)1-9
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
The illustration of Fig.5 is explained about AV-28R4SK/AV-32R4SK.
In case of AV-28T Series or AV-32T Series MODELS, you disassemble in the same procedure using Fig.6.
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power plug.
(2) Remove the sub woofer cord from the AV TERMINAL
BOARD.
(3) Remove the SUB WOOFER UNIT on the top of the rear
cover upward.
(4) Remove the 13 screws [A] as shown in Fig.5.
(5) Withdraw the REAR COVER toward you.
3.1.2 REMOVING THE SIDE CONTROL JACK ASSY
• Remove the REAR COVER.
(1) Remove the screw [B] as shown in Fig.5.
(2) Slightly pull the SIDE CONTROL JACK ASSY toward you,
and detach the claw from FRONT CABINET.
Then it can be removed.
(3) Then disconnect the connector [S], [F] and [K] as shown
in Fig 1.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 3 claws [C] from backside of the SIDE
CONTROL JACK ASSY as shown in Fig.1.
(2) Remove the SIDE CONTROL PWB from the SIDE
CONTROL JACK ASSY.
3.1.4 REMOVING THE AV TERMINAL BOARD
• Remove the REAR COVER.
(1) Remove the 5 screws [G] as shown in Fig. 5.
(2) Remove the 2 claws [H] at the bottom of the AV
TERMINAL BOARD as shown in Fig. 2.
(3) Shift the AV TERMINAL BOARD slightly in the direction of
arrow [I], and remove it as shown in Fig. 2.
(4) At first, expand the lever [K] with the SUB WOOFER connector,
and pull it out of connector jack as shown in Fig.3.
3.1.5 REMOVING THE MAIN CHASSIS
• Remove the REAR COVER.
(1) Slightly raise the MAIN CHASSIS, and release the two claws
at the bottom of and both sides of the MAIN CHASSIS.
(2) Then withdraw the MAIN CHASSIS backward from the
front cabinet. (If necessary, detach the wire clamp,
connectors etc.)
3.1.6 REMOVING THE MAIN SPEAKER
• Remove the REAR COVER.
(1) Remove the 2 screws [E], and detach the MAIN SPEAKER
HOLDER as shown in Fig. 5. (When removing the screws
[E] of the MAIN SPEAKER HOLDER, the lower side screw
first, and then upper one.)
(2) Remove the 4 screws [F], which attached the MAIN
SPEAKER.
(3) Follow the same steps when disassemble the other hand
MAIN SPEAKER.
3.1.7 REMOVING THE CENTER SPEAKER
• Remove the REAR COVER.
• Remove the MAIN CHASSIS.
(1) Remove the 2 screws [D] as shown in Fig. 5.
(2) Remove the CENTER SPEAKER. If necessary, detach the
cables.
3.1.8 CHECKING THE PW BOARD
(1) Pull out the MAIN CHASSIS (Refer to REMOVING THE
MAIN 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.
3.1.9 CAUTION
(1) When erecting the MAIN CHASSIS, be careful so that
there will be no contacting with other PWB.
(2) Before turning power on, make sure that the wire connector
is properly connected.
(3) 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.
3.1.10 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
Fig.3
SIDE
CONTROL
PWB
Connector
F
S
K
(Back view)
FRONT
C
C
AV JACK PWB
AV
TERMINAL
BOARD
H
I
H
AV TERMINAL
BOARD
SUB WOOFER
CORD
SUB WOOFER
CORD K
CONNECTOR for
SUB WOOFER
K

1-10 (No.YA060)
3.1.11 REMOVING THE SUB WOOFER UNIT [AV-28R4SK / AV-32R4SK]
(1) Remove the 15 screws [L], remove the SP BOX B.
(2) Remove the 4 screws [M], remove the SPEAKER.
(3) Remove the 3 screws [N], remove BASS INT. DUCT.
CAUTION
• The woofer unit is mounted on the TV. Always move the TV
and woofer unit together when removing the TV from the
box, or when moving the woofer unit.
• If the TV is tilted during movement the woofer unit may fall.
Be careful to keep the TV level when moving it.
• Do not grip the woofer unit when moving the TV.
• Do not place objects on the woofer unit duct.
Fig.4
L
M
N
N
L
L
SP BOX B
SP BOX T
SPEAKER
BASS
INT. DUCT
BASS
INT. DUCT
TOP

(No.YA060)1-11
3.1.12 EXPLODED VIEW [AV-28R4SK and AV-32R4SK]
Fig.5
REAR COVER
FRONT CABINET
MAIN SPEAKER
SPEAKER
CRT SOCKET PWB
CENTER
SIDE
CONTROL
PWB
POWER & DEF. PWB
AV JACK PWB
MAIN PWB
DOLBY PWB
CLAW
CLAW MAIN CHASSIS
FRONT CONTOL PWB
CONTROL
BASE
AV TERMINAL
BOARD
A
F
SIDE CONTROL
JACK ASSY
B
POWER CORD
E
G
D
MAIN SPEAKER
HOLDER
SUB WOOFER UNIT
SUB WOOFER CORD

1-12 (No.YA060)
3.1.13 EXPLODED VIEW [AV-28T Series and AV-32T Series]
Fig.6
POWER CORD
REAR COVER
This exploded view describes
about AV-32T4SP.
Although other models(AV-28T
series / AV-32T series) are
slightly different from this figure
you can use the exploded view
for disassembling other models
in same step as AV-32T4SP.
FRONT CABINET
CRT SOCKET PWB
AV JACK PWB
SIDE
CONTROL
PWB
MAIN PWB
B
A
G
E
F
MAIN
SPEAKER
MAIN SPEAKER
HOLDER
SIDE CONTROL
JACK ASSEMBLY
CLAW
CLAW POWER & DEF.PWB
AV TERMINAL
BOAD
FRONT CONTOL PWB
CONTROL
BASE

(No.YA060)1-13
3.1.14 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. 6).
(2) While keeping the surface of CRT down, mount the TV set
on the CRT change table balanced will as shown in Fig. 6.
(3) Remove 4 screws marked by arrows with a box type
screwdriver as shown in Fig. 7.
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. 8.
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.7
Fig.8
Fig.9
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.9.Wipe around the anode button with clean and dry cloth. (Fig.9)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.10)
Silicon grease product No. KS - 650N
Fig.10 Fig.11
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.YA060)
3.2 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.
3.2.1 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) Refer to the "SETTING VALUES OF SYSTEM
CONSTANT SET" , and check the setting items. Where
these differ, select the addres with the [FUNCTION (UP/
DOWN)] key and adjust it with the [FUNCTION (RIGHT/
LEFT)] keys. (The letter of the selected item is displayed
in yellow.)
(5) A setup will become effective if the main power is shut
off.
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
3.2.2 SYSTEM CONSTANT SETTING
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. SHIPPING (OFF)
MODEL=JW EURO (XXXXX)
EEP EDIT (LAST MEMORY)
TOP ADDRESS=000H
00 01 02 03 04 05 06 07
8F 00 FE FF FF FF FF FF
08 09 0A 0B 0C 0D 0E 0F
FF 01 BB FC 1F F9 FF FF
Do not adjust
Address
Setting data
Names of key
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
key
OK
NAME OF REMOTE CONTROL KEY
Address
Setting data
AV-28R4SK AV-28T4SK
AV-28T4BK AV-28T4SP AV-28T4SR
AV-28T4BR AV-28T77SK AV-32R4SK AV-32T4SK AV-32T4SP AV-32T4SR AV-32T77SK
00 8F 8B CF CF 89 9F 9B DF DF 99
01 00 00 02 01 00 00 00 02 01 00

(No.YA060)1-15
3.2.3 SETTINGS OF FACTORY SHIPMENT
3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION
3.2.3.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE
(2) SOUND
(3) FEATURES
(4) SET UP
Setting item Setting position
POWER Off
CHANNEL PR1
VOLUME 10
Setting item Setting position
CHANNEL PR1
VOLUME 10
ZOOM PANORAMIC
3D SOUND OFF
Setting item Setting position
PICTURE MODE STANDARD
CONTRAST / BRIGHT
SHARP / COLOUR / HUE
Refer to [5. VSM PRESET]
COLOUR TEMP. NORMAL
FEATURES
AUTO VNR AUTO
COLOUR SYSTEM TV According to preset CH
EXT AUTO
4:3 AUTO ASPECT PANORAMIC
Setting item Setting position
STEREO / I•II Stereo sound
BASS Centre
TREBLE Centre
BALANCE Centre
HYPER SOUND OFF
DOLBY VIRTUAL
[AV-28T77SK/AV-32T77SK]
OFF
TV SPEAKER
[AV-28R4SK/AV-32R4SK]
ON
SUROUND MODE
[AV-28R4SK/AV-32R4SK]
DOLBY
PRO LOGIC II
TV SPEAKER L / C / R
LEFT MAX
CENTRE MAX
RIGHT MAX
LS MAX
RS MAX
WOOFER MAX
DISTANCE 0
Setting item Setting position
SLEEP TIMER OFF
BLUE BACK ON
CHILD LOCK Refer to OPERATION
INSTRUCTIONS
Setting item Setting position
AUTO PROGRAM TV channel automatically set
EDIT/MANUAL PRESET CH only
The others : BLANK
LANGUAGE ENGLISH
DECODER (EXT-2) OFF
EXT SETTING ID BLANK
S-IN BLANK
DUBBING EXT-1 →EXT-2
PICTURE TILT MIDDLE

1-16 (No.YA060)
3.2.4 SERVICE MENU SETING ITEMS
Setting item Setting value Setting item Setting value
1. IF 1. VCO
2. DELAY POINT
5. VSM PRESET BRIGHT/SOFT/STD COOL/WARM/NOMAL
1.BRIGHT
2.CONT.
3.COLOUR
4.SHARP
5.HUE
1.WDR R
2.WDR G
3.WDR B
2. V / C 1.SCREEN
2.CUTOFF R / G
3.WDR R / G / B
4.BRIGHT
5.CONT.
6.COLOUR
7.HUE
8.BLACK OFFSET B-Y
9.SHARP
10.Y-DELAY
11.TINT DVD
12.RGB BLK
6.VPS
(Do not adjust)
VPS
PDC
WSS
SN
3. AUDIO
(Do not adjust)
1.DCX0 ADJ.
2.ERROR LIMIT
3.A2 ID THR
7.SHIPPING
(Do not adjust)
ON/OFF
4. DEF. 1.V-SHIFT
2.V-SLOPE
3.V-SIZE
4.H-CENT
5.H-SIZE
6.TRAPEZ
7.EW-PIN
8.COR-UP
9.COR-LOW
10.ANGLE
11.BOW
12.V-S.CR
13.V-LIN

(No.YA060)1-17
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 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.
3.3.2 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.
3.3.3 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.YA060)
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-1 adjustment
• SUB COLOUR-2 adjustment
• SUB HUE-1 adjustment
• SUB HUE-2 adjustment
• SECAM BLACK OFFSET adjustment
VSM PRESET SETTING
• VSM PRESET setting
Item Preset value
PICTURE MODE STD
COLOUR TEMP. NORMAL
BASS / TREBLE / BALANCE Centre
ZOOM FULL
SLEEP TIMER OFF

(No.YA060)1-19
4.5 ADJUSTMENT LOCATIONS
SIDE CONTROL PWB
TOP
SPEAKER
CENTER
SPEAKER
SUB
WOOFER
POWER
SW FRONT
POWER
LED
D8801 IC8851
F8901 LF8901
W
S
F
KPOWER CORD
FRONT
MAIN PWB
POWER&DEF PWB
FRONT CONTROL PWB
RL
HV
K
B
B
PW
F
X
W
IC941
CN004
CN003
TOP
CRT SOCKET PWB
TP-47B E1
(SOLDER SIDE)
HVT
1
5
1 B1
2 N.C.
3 X-ray
4 X-ray
5 GND
AV JACK
PWB
CN001
TUNER
DOLBY PWB
[AV-28R4SK / AV-32R4SK]
28"MODEL
32"MODEL
CN009
S
SW
SC
IC702
TP-47G
TP-47R TP-E
CN008
MEMORY
IC
(Only AV-28R4SK
/ AV-32R4SK)
[AV-28R4SK / AV-32R4SK]
CN3008
CN3009
SC
VM2
FOCUS1
FOCUS2
SCREEN
FOCUS1
SCREEN

1-20 (No.YA060)
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.VPS, and 7.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 / CHROMA circuit.
3.AUDIO This mode adjusts the setting values of the multiplicity SOUND circuit. [Do not adjust]
4.DEF This mode adjusts the setting values of the DEFLECTION circuit for each aspect mode given below.
5.VSM PRESET This mode adjusts the initial setting values of COOL, NORMAL and WARM. (VSM : Video Status Memory)
6.VPS This mode shows the monitor of the VPS, PDC, WSS and SN. [Do not adjust]
7.SHIPPING(OFF) This mode is set at shipping. [Do not adjust]
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. SHIPPING (OFF)
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] / [3] / [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.