JVC AV-28T5BK/P User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA261B
2005/8
COLOUR TELEVISION
YA261B20058
AV-28T5BK/P, AV-28T5BR/P,
AV-28T5SK/P, AV-28T5SR/P,
AV-28T5SP/P
HOW TO IDENTIFY MODELS
Supplementary
AV-28T5BK/P, AV-28T5BR/P, AV-28T5SK/P, AV-28T5SR/P and AV-28T5SP/P is the models whose production
place of pwb ass’y was changed based on AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP.
Therefore, this service manual describes only the items which differ from those of the AV-28T5BK,
AV-28T5BR, AV-28T5SK, AV-28T5SR and AV-28T5SP service manual.
For details other than those described in this manual, please refer to the AV-28T5BK, AV-28T5BR, AV-
28T5SK, AV-28T5SR and AV-28T5SP service manual (No.YA261, 2005/3).
"PE" is added to the serial No. under at the Rating label.
Indicated PE
AV-28T5SR
AV-28T5SP
AV-28T5SK
AV-28T5BR
AV-28T5BK
BASIC CHASSIS
JW2

1-2 (No.YA261B)
DIFFERENCE LIST
USING P.W. BOARD (Page 3-2)
EXPLODED VIEW PARTS LIST (Page 3-3)
P.W.B ASS'Y Name
AV-28T5BK
AV-28T5BR
AV-28T5SK
AV-28T5SR
AV-28T5SP
AV-28T5BK/P
AV-28T5BR/P
AV-28T5SK/P
AV-28T5SR/P
AV-28T5SP/P
DESCRIPTION
POWER & DEF PWB SJW-2012A-S2 LCA10364-09C (SJW-2012A-H3) Non compatible
CRT SOCKET PWB SJW-3012A-U2 LCA90245-05B (SJW-3012A-H3) Compatible
FRONT CONTROL PWB SJW-8011A-U2 LCA90300-02A (SJW-8011A-H3) Non compatible
SIDE CONTROL PWB SJW-8111A-U2 LCA90301-02B (SJW-8111A-H3) Compatible
AV JACK PWB SJW0J011A-U2 LCA90248-02C (SJW0J011A-H3) Compatible
Ref. No. Part No. PART NAME DESCRIPTION
AV-28T5BK AV-28T5BK/P
26 LC11364-077A-U LC11364-090A-U RATING LABEL
40 SJW-3012A-U2 LCA90245-05B CRT SOCKET PWB
41 SJW-8011A-U2 LCA90300-02A FRONT CONTROL PWB
42 SJW-2012A-S2 LCA10364-09C POWER & DEF PWB
43 SJW0J011A-U2 LCA90248-02C AV JACK PWB
45 SJW-8111A-U2 LCA90301-02B SIDE CONTROL PWB
Ref. No. Part No. PART NAME DESCRIPTION
AV-28T5BR AV-28T5BR/P
26 LC11364-078A-U LC11364-088A-U RATING LABEL
40 SJW-3012A-U2 LCA90245-05B CRT SOCKET PWB
41 SJW-8011A-U2 LCA90300-02A FRONT CONTROL PWB
42 SJW-2012A-S2 LCA10364-09C POWER & DEF PWB
43 SJW0J011A-U2 LCA90248-02C AV JACK PWB
45 SJW-8111A-U2 LCA90301-02B SIDE CONTROL PWB
Ref. No. Part No. PART NAME DESCRIPTION
AV-28T5SK AV-28T5SK/P
26 LC11364-075A-U LC11364-089A-U RATING LABEL
40 SJW-3012A-U2 LCA90245-05B CRT SOCKET PWB
41 SJW-8011A-U2 LCA90300-02A FRONT CONTROL PWB
42 SJW-2012A-S2 LCA10364-09C POWER & DEF PWB
43 SJW0J011A-U2 LCA90248-02C AV JACK PWB
45 SJW-8111A-U2 LCA90301-02B SIDE CONTROL PWB

(No.YA261B)1-3
PRINTED WIRING BOARD PARTS LIST
POWER & DEF P.W. BOARD ASS'Y (Page 3-7)
Ref. No. Part No. PART NAME DESCRIPTION
AV-28T5SR AV-28T5SR/P
26 LC11364-076A-U LC11364-087A-U RATING LABEL
40 SJW-3012A-U2 LCA90245-05B CRT SOCKET PWB
41 SJW-8011A-U2 LCA90300-02A FRONT CONTROL PWB
42 SJW-2012A-S2 LCA10364-09C POWER & DEF PWB
43 SJW0J011A-U2 LCA90248-02C AV JACK PWB
45 SJW-8111A-U2 LCA90301-02B SIDE CONTROL PWB
Ref. No. Part No. PART NAME DESCRIPTION
AV-28T5SP AV-28T5SP/P
26 LC12098-003A-U LC12098-009A-U RATING LABEL
40 SJW-3012A-U2 LCA90245-05B CRT SOCKET PWB
41 SJW-8011A-U2 LCA90300-02A FRONT CONTROL PWB
42 SJW-2012A-S2 LCA10364-09C POWER & DEF PWB
43 SJW0J011A-U2 LCA90248-02C AV JACK PWB
45 SJW-8111A-U2 LCA90301-02B SIDE CONTROL PWB
Ref. No.
Part No.
PART NAME DESCRIPTION
AV-28T5BK
AV-28T5BR
AV-28T5SK
AV-28T5SR
AV-28T5SP
AV-28T5BK/P
AV-28T5BR/P
AV-28T5SK/P
AV-28T5SR/P
AV-28T5SP/P
SJW-2012A-U2 LCA10364-09C
Q571 DTC124ESA-T --- DIGI TRANSISTOR Delete
Q572 KTC3199/YG/-T --- TRANSISTOR Delete
Q573 RDN050N20 --- POWER MOS FET Delete
Q574 RDN050N20 --- POWER MOS FET Delete
D909 --- AU01Z-T2 FR DIODE Addition
D910 --- AU01Z-T2 FR DIODE Addition
D955 FSF05A20 FMX-G12S SI DIODE
C524 QFM72DK-104 --- M CAPACITOR Delete
C526 QFZ0197-254 QFZ0197-274 MPP CAPACITOR 0.27uF 250V J
C529 QFM72DK-393 QFN32DK-393 M CAPACITOR 0.039uF 200V K
C572 QFZ0197-124 --- MPP CAPACITOR Delete
C912 QFLC1HJ-681Z QFLC1HJ-102Z M CAPACITOR 1000pF 50V J
C913 QDC31HJ-820Z --- C CAPACITOR Delete
R467 QRL039J-120 QRL039J-270 OMF RESISTOR 27Ω3W J
R571 QRE141J-103Y --- C RESISTOR Delete
R572 QRE141J-222Y --- C RESISTOR Delete
R573 QRE141J-183Y --- C RESISTOR Delete
R574 QRE121J-124Y --- C RESISTOR Delete
R575 QRE141J-123Y --- C RESISTOR Delete
R576 QRE121J-124Y --- C RESISTOR Delete
R577 QRE141J-103Y --- C RESISTOR Delete

1-4 (No.YA261B)
CRT SOCKET P.W. BOARD ASS'Y
The number of PWB have been changed. However, there is no change in component parts.
FRONT CONTROL P.W. BOARD ASS'Y (Page 3-9)
SIDE CONTROL P.W. BOARD ASS'Y
The number of PWB have been changed. However, there is no change in component parts.
AV JACK P.W. BOARD ASS'Y
The number of PWB have been changed. However, there is no change in component parts.
R919 --- QRE141J-182Y C RESISTOR 1.8kΩ1/4W J
CN0HV CHC802T-05N-J CHC802T-05N-T LV CONNECTOR
K902 QQR0621-002Z --- FERRITE BEADS Delete
PC571 PC123Y22FZ --- PHOTO COUPLER Delete
TH901 CEKP002-003 QAD0121-9R0 P THERMISTOR 9Ω
Ref. No.
Part No.
PART NAME DESCRIPTION
AV-28T5BK
AV-28T5BR
AV-28T5SK
AV-28T5SR
AV-28T5SP
AV-28T5BK/P
AV-28T5BR/P
AV-28T5SK/P
AV-28T5SR/P
AV-28T5SP/P
SJW-2012A-U2 LCA10364-09C
Ref. No.
Part No.
PART NAME DESCRIPTION
AV-28T5BK
AV-28T5BR
AV-28T5SK
AV-28T5SR
AV-28T5SP
AV-28T5BK/P
AV-28T5BR/P
AV-28T5SK/P
AV-28T5SR/P
AV-28T5SP/P
SJW-8011A-U2 LCA90300-02A
D8851 --- MA8030/H/-X Z DIODE Addition
R8852 QRE121J-470Y QRE121J-101Y C RESISTOR 100Ω1/2W J

(No.YA261B)1-5
SECTION 1
PRECAUTION
Please refer to "AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP (No.YA261)" about this section.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Please refer to "AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP (No.YA261)" about this section.
SECTION 3
DISASSEMBLY
Please refer to "AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP (No.YA261)" about this section.
SECTION 4
ADJUSTMENT
Please refer to "AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP (No.YA261)" about this section.
SECTION 5
TROUBLESHOOTING
Please refer to "AV-28T5BK, AV-28T5BR, AV-28T5SK, AV-28T5SR, AV-28T5SP (No.YA261)" about this section.

(No.YA261B)
AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
Victor Company of Japan, Limited
VPT
Printed in Japan

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA261
2005/3
COLOUR TELEVISION
YA26120053
AV-28T5BK, AV-28T5BR,
AV-28T5SK, AV-28T5SP,
AV-28T5SR
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
BASIC CHASSIS
JW2
1
4
7
2
5
8
0
3
6
9
P
AV
TV OK
MENU
P
TV
F.T/L

1-2 (No.YA261)
SPECIFICATION
Design & specifications are subject to change without notice.
Items
Contents
AV-28T5SK
AV-28T5BK
AV-28T5SR
AV-28T5BR AV-28T5SP
Dimensions ( W ×H ×D ) 76.2cm ×52.8cm ×49.2cm
Mass 38.0kg
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)
WST(Standard system)
TOP (German system)
FLOF (Fastext)
WST (Standard system)
Power Input AC220V - AC240V, 50Hz
Power Consumption 110W, 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 13cm ×6.5cm oval type ×2
Audio Power Output 10W + 10W
Aerial Input Terminal 75Ωunbalanced, coaxial
EXT-1 / EXT-2 / EXT-3
(Input / Output)
21-pin Euro connector (SCART socket ×3)
EXT-4 (Input) Video
Audio
1V(p-p) positive, negative sync provided, 75Ω, RCA pin jack ×1
500mV(rms) (-4dBs), high impedance, RCA pin jack ×2
Headphone Jack Stereo mini jack (Ø3.5mm ×1)
Remote Control Unit RM-C1502 (AA/R6 dry cell battery ×2) [AV-28T5SK, AV-28T5SR, AV-28T5SP]
RM-C1502B (AA/R6 dry cell battery ×2) [AV-28T5BK, AV-28T5BR]

(No.YA261)1-3
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

1-4 (No.YA261)
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.

(No.YA261)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
ZOOM
This function can change the screen size according to the
picture aspect ratio.
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.
PICTURE MODE
This function can adjust the picture settings automatically.
HYPER SOUND
You can enjoy sounds with a wider ambience.
2.2 MAIN DIFFERENCE LIST
2.3 21-PIN EURO CONNECTOR (SCART) : EXT-1/EXT-2/EXT-3
(P-P= Peak to Peak, B-W= Blanking to white peak)
Item AV-28T5SP AV-28T5SK AV-28T5SR AV-28T5BR AV-28T5BK
CABINET COLOUR Silver ←←Black ←
POWER CORD EU 2-pin type UK 3-pin type ←←←
TELETEXT FLOF, WST, TOP FLOF, WST ←←←
PICTURE & TEXT YES NO NO NO NO
STAND ASSY NO YES ←←←
REMOTE CONTROL UNIT RM-C1502 ←←RM-C1502B ←
MAIN PWB SJW-1012A-U2 SJW-1912A-U2 SJW-1012A-U2 ←SJW-1912A-U2
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]

1-6 (No.YA261)
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 Scan velocity modulation
2 VssC4 -- GND 66 FbiSo I H pulse (Flyback pulse)
3 V1.8C4 I 1.8V 67 Hout O H drive
4 V3.3A3 I 3.3V 68 VssComb -- GND
5 VrefP_Sdac I 3.3V 69 V5Comb I 5V for comb filter
6 VrefN_Sdac -- GND 70 Vin/R2/Pr I EXT-1 R-Y
7 VrefP_Sdac I 3.3V 71 Uin/B2/Pb I EXT-1 B-Y
8 VrefN_Sdac -- GND 72 Yin/G2/Y I EXT-1 Y
9 VrefP_Sdac I 3.3V 73 Ysync I Y for SyncSep
10 XtalIn I System clock(4MHz) 74 Yout O Y(for 73pin)
11 XtalOut O System clock(4MHz) 75 Uout/INSSW2 I Ys(for EXT-1 Y/R-Y/B-Y insertion)
12 VssA1 -- GND 76 Vout/Swo1 -- Not used
13 Vguard I CRT NECK protection 77 INSSW3 I Ys(for EXT-2 Y/R-Y/B-Y insertion)
14 DecDig -- 1.8V 78 R3/Pr I EXT-2 R-Y
15 V5P1 I 5V 79 G3/Y I EXT-2 Y
16 Phi2 -- Not used 80 B3/Pb I EXT-2 B-Y
17 Phi1 -- Not used 81 Gnd3 -- GND
18 Gnd1 -- GND 82 V5P3 I 5V
19 SecPll -- Not used 83 BCL I Auto Beam / contrast
20 Dec8G -- Not used 84 BLKIN I Black current input (For Auto white balance)
21 Ewd/Avl O Parabola wave 85 Rout O Red (for CRT)
22 Vdb O V. Drive(-) 86 Gout O Green (for CRT)
23 Vda O V. Drive(+)(For side pin) 87 Bout O Blue (for CRT)
24 Vif1 I IF 88 V3.3A1 I 3.3V
25 Vif2 I IF 89 RefAdN -- Not used
26 Vsc -- Not used 90 V3.3RefAdP I 3.3V
27 Iref -- Not used 91 RefAd -- Not used
28 GndIF -- GND 92 GndA -- GND
29 Sif1 I SIF 93 V1.8A I 1.8V
30 Sif2 I SIF 94 V3.3A2 I 3.3V
31 Agc O AGC 95 VssAD -- GND
32 EHT I HV change control 96 V1.8ADC I 1.8V
33 Ssif/RefIn/Avl/RefOut O L'/Other SW [L':H] 97 REMOCON I Remote control
34 AudoIn5L I Not used 98 P10/Int1 I AV_LINK control
35 AudioIn5R I Not used 99 P11/TO O AV_LINK control
36 AudOutSL O Audio (Left) 100 V1.8C2 I 1.8V
37 AudOutSR O Audio (Right) 101 VssC2 -- GND
38 DecsDem -- Not used 102 P04/I2SWs -- Not used
39 QssO/AmO/AudeEm -- Not used 103 P03/I2SClk -- Not used
40 Gnd2 -- GND 104 P02/I2SDo2 -- Not used
41 PllIf -- Not used 105 P01/I2SDo1 -- Not used
42 SifAgc -- Not used 106 HP_DET I Head phone connection detection [Connect : L]
43 IfVo/FmRo/DvbO O Composite video detect 107 P13/T1 O Main power control [ON : H]
44 FmRo/DvbO -- Not used 108 SCL1 O I2C bus (clock) for AV SW, TUNER, VOLUME
45 V8AudioSwitches I 8V 109 SDA1 I/O I2C bus (data) for AV SW, TUNER, VOLUME
46 AgcSsif -- Not used 110 V3.3P I 3.3V
47 V5P2 I 5V 111 P20/TPwm O ROTATION
48 SVO/IfVo/Cvbsl -- Not used 112 P21/Pwm0 O S-CORRECTION CONTROL(PANORAMIC)
49 Audio4InL -- Not used 113 P22/Pwm1 O Audio muting [Muting : L]
50 Audio4InR -- Not used 114 P23/Pwm2 -- Not used
51 Y4/Cvbs4 I Composite video /Y 115 Protect I Protection detection for Low B short [Detect : H]
52 C4 I Chroma 116 P31/Adc1 O Lighting for POWER LED [ON : Soft RED]
53 Audio2InL -- Not used 117 V1.8C1 I 1.8V
54 Audio2InR -- Not used 118 DecV1V8 I 1.8V
55 Cvbs2/Y -- Not used 119 Key I Key scan front control
56 Audio3InL -- Not used 120 AGC I AGC
57 Audio3InR -- Not used 121 VssC1+P1 -- GND
58 Y3/Cvbs -- Not used 122 P24/PW3 -- Not used
59 C3 -- Not used 123 P25/PWM4 -- Not used
60 AudOutLsL -- Not used 124 V1.8C3 I 1.8V
61 AudOutLsR -- Not used 125 VssC3 -- GND
62 AudOutHpL -- Not used 126 Power DET I Main power detection [ON:H]
63 AudOutHpR -- Not used 127 P14/RX I/O I2C bus (data) for generally
64 CVBSO/PIP -- Not used 128 P15/TX O I2C bus (clock) for generally

(No.YA261)1-7
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) 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].
(2) Slightly shift the SIDE CONTROL JACK ASS'Y to rear side
and remove the 1 claws under the SIDE CONTROL JACK
ASS'Y.
3.1.3 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
• Remove the SIDE CONTROL JACK ASSY.
(1) Remove the 2 screws [C].
(2) Remove the 2 claws from back side of the SIDE CONTRL
JACK ASS'Y, then pull out 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 CHASSI S
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 2 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 CHASSIS BASE.
(1) Remove the 4 screws [E], then remove the SPEAKER.
(2) Follow the same steps when removing the other hand
MAIN 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.

1-8 (No.YA261)
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 ASSY
SIDE CONTROL PWB
CRT SOCKET PWB
SPEAKER
SPEAKER
A
B
C
E
D
E

(No.YA261)1-9
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 MODE screen of Fig. 1 will be displayed.
(3) While the SERVICE MODE 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 "SYSTEM CONSTANT SETTING", and
check the setting items. Where these differ, select the
addres with the [FUNCTION /]key and adjust it with
the [FUNCTION /]keys. (The letter of the selected
item is displayed in yellow.)
(5) 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 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
3.2.2 SYSTEM CONSTANT SETTING
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. SHIPPING (OFF)
MODEL=JW2 EURO (XXXXX)
EEP EDIT (LAST MEMORY)
TOPADDRESS=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
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
/
Address Setting data
AV-28T5SK AV-28T5SP AV-28T5SR AV-28T5BR AV-28T5BK
00 A7 EF E7 E7 A7
01 00 02 01 01 00

1-10 (No.YA261)
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
(5) VSM PRESET TABLE
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
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 -2
TREBLE +2
BALANCE Centre
HYPER SOUND OFF
Setting item Setting position
SLEEP TIMER OFF
BLUE BACK ON
CHILD LOCK OFF
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
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 +12 +10 +2 --- --- ---
3.COLOUR -16 - +16 +6 0 -2 --- --- ---
4.SHARP -16 - +16 0 0 -2 --- --- ---
5.HUE -16 - +16 0 0 0 --- --- ---
1.R DRIVE -63 - +63 --- --- --- -7 0 +5
2.G DRIVE -63 - +63 --- --- --- 0 0 0
3.B DRIVE -63 - +63 --- --- --- +7 0 -5

(No.YA261)1-11
3.2.4 SERVICE MODE SETING ITEMS
Setting item Setting value Setting item Setting value
1. IF 1. VCO
2. DELAY POINT
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-LO
10. ANGLE
11. BOW
12. V.S-CR
13. V.LIN
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
5. VSM PRESET BRIGHT/SOFT/STANDARD
1. BRIGHT
2. CONT.
3. COLOUR
4. SHARP
5. HUE
COOL/WARM/NORMAL
1. R DRIVE
2. G DRIVE
3. B DRIVE
3. AUDIO
[Do not adjust]
1. DCX0 ADJ.
2. NICAM LOWER ERRLIM
3. NICAM UPPER ERRLIM
4. A2 ID THR
6. VPS
[Do not adjust]
VPS
PDC
WSS
SN
7.SHIPPING (OFF)
[Do not adjust]
---

1-12 (No.YA261)
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
AB
C
A
B
C

(No.YA261)1-13
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
• SECAM BLACK OFFSET adjustment
VSM PRESET SETTING
• VSM PRESET setting
Item Preset value
PICTURE MODE STANDARD
COLOUR TEMP. NORMAL
BASS / TREBLE / BALANCE Centre
ZOOM FULL
SLEEP TIMER OFF

1-14 (No.YA261)
4.5 ADJUSTMENT LOCATIONS
FOCUS
F
X
S
LR K
K
F
S
B
B
W
W
HV
HVT
HVT
SCREEN
CN003
CN009
CN001
CN3008 CN3009
CN004
CN008
MAIN PWB
AV JACK PWB
POWER & DEF PWB
PW
DEG
TUNER
FRONT
FRONT
FRONT
TOP
CRT SOCKET PWB (SOLDER SIDE)
FRONT CONTROL PWB
SIDE CONTROL PWB
SPEAKER
POWER CORD
1 : TP-91(B1)
2 : TP-E
3 : X-RAY1
4 : X-RAY2
5 : TP-E( )
DEF. YOKE
DEG COIL
TP-47R
TP-47G
TP-E
TP-47B
1
5