Loading...JVC AV-28RT4BU/A, AV-28RT4BU/B, AV-28RT4BU/C, AV-28RT4SU/A, AV-28RT4SU/B Service Manual
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SERVICE MANUAL
COLOUR TELEVISION
AV-28RT4BU/A, AV-28RT4BU/B,
AV-28RT4BU/C, AV-28RT4SU/A,
AV-28RT4SU/B, AV-28RT4SU/C
STEREO |
RM-C1100 TV |
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA079
2005/2
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SPECIFICATION |
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Item |
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Content |
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Dimensions ( W × H × D ) |
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76.5cm × 58.5cm × 48.6cm |
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Mass |
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33.8kg |
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TV RF System |
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B/G, D/K, L/L' |
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Colour System |
TV Mode |
PAL / SECAM |
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Video Mode |
PAL / SECAM / NTSC 3.58 / NTSC 4.43 |
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Sound System |
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A2 (B/G, D/K), NICAM (B/G, D/K, L/L') |
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Teletext System |
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Fastext / TOP / WST |
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Tuning System |
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Frequency synthesizer tuning system |
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Receiving Frequency |
VHF(VL) |
46.25MHz - 168.25MHz |
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VHF(VH) |
175.25MHz - 463.25MHz |
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UHF |
471.25MHz - 863.25MHz |
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CATV |
S01 - S41 & S75 - S79 |
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Intermediate Frequency |
VIF |
38.9MHz (B/G, D/K, L) / 33.9MHz (L') |
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SIF |
33.4MHz (5.5MHz:B/G) / 32.9MHz (6.0MHz:D/K) / |
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32.4MHz (6.5MHz:L) / 40.4MHz (6.5MHz:L') |
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Colour Sub Carrier Frequency |
PAL |
4.43MHz |
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SECAM |
4.40625MHz / 4.43MHz |
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NTSC |
3.58MHz / 4.43MHz |
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Power Input |
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AC220V - AC240V, 50Hz |
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Power Consumption |
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120W (Max) / 3W (Standby) |
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Aerial Input Terminal |
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75Ω unbalanced, coaxial |
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Picture Tube Size |
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Visible size : 66cm (28”), Measured diagonally (H: 58.3cm × V: 33.0cm) |
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High Voltage |
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29kV (at zero bean current) |
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Speaker |
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5.7cm × 12.6cm, Oval type × 2 |
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Audio Output |
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10W + 10W (THD10%) |
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EXT-1 Input / Output |
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21-pin Euro connector (SCRAT socket) × |
1 |
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EXT-2 Input / Output |
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21-pin Euro connector (SCRAT socket) × |
1 |
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EXT-3 Input |
Video |
1V(p-p) 75Ω , RCA pin jack × 1 |
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Audio (L/R) |
500mV(rms) (-4dBs), High Impedance, RCA pin jack × 2 |
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Headphone jack |
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Stereo mini jack 3.5mm |
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Remote Control Unit |
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VE-30017763 (RM-C1100), (AA/R06 dry battery × 2) |
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Design & specifications are subject to change without notice.
1-2 (No.YA079)
21-PIN EURO CONNECTOR (SCRAT) : EXT-1 / EXT-2
Pin No. |
Signal designation |
Matching value |
EXT-1 |
EXT-2 |
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1 |
AUDIO R output |
500mV(rms) (Nominal), Low impedance |
Used (TV OUT) |
Used (LINE OUT) |
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2 |
AUDIO R input |
500mV(rms) (Nominal), High impedance |
Used (R1) |
Used (R2) |
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3 |
AUDIO L output |
500mV(rms) (Nominal), Low impedance |
Used (TV OUT) |
Used (LINE OUT) |
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4 |
AUDIO GND |
--- |
Used |
Used |
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5 |
GND (B) |
--- |
Used |
Used |
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6 |
AUDIO L input |
500mV(rms) (Nominal), High impedance |
Used (L1) |
Used (L2) |
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7 |
B input |
700mV(B-W), 75 Ω |
Used |
Not used |
8 |
FUNCTION SW (SLOW SW) |
Low : 0V-3V |
Used |
Used |
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High : 8V-12V, High impedance |
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9 |
GND (G) |
--- |
Used |
Used |
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10 |
SCL / T-V LINK |
--- |
Not used |
Used |
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(SCL / T-V LINK) |
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11 |
G input |
700mV(B-W), 75 Ω |
Used |
Not used |
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12 |
SDA3 |
--- |
Not used |
Used |
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13 |
GND (R) |
--- |
Used |
Used |
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14 |
GND (YS) |
--- |
Used |
Not used |
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15 |
R / C input |
R : 700mV(B-W), 75 Ω |
Used (R) |
Used (C) |
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C : 300mV(P-P), 75 Ω |
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16 |
Ys input (FAST SW) |
Low : 0V-0.4V, 75 Ω |
Used |
Not used |
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High : 1V-3V, 75 Ω |
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17 |
GND (VIDEO output) |
--- |
Used |
Used |
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18 |
GND (VIDEO input) |
--- |
Used |
Used |
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19 |
VIDEO output |
1V(P-P) (Negative sync),75 Ω |
Used (TV OUT) |
Used (LINE OUT) |
20 |
VIDEO / Y input |
1V(P-P) (Negative sync), 75 Ω |
Used |
Used |
21 |
COMMON GND |
--- |
Used |
Used |
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(P-P= Peak to Peak, B-W= Blanking to white peak)
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
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21 |
19 |
17 |
15 |
13 |
11 |
9 |
7 |
5 |
3 |
1 |
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(No.YA079)1-3
SECTION 1 PRECAUTION
1.1SAFETY PRECAUTIONS
(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 ADJUSTMENT OF B1 POWER SUPPLY).
(6)The high voltage applied to the picture tube must conform with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.
(7)Do not check high voltage by drawing an arc. Use a high voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button.
1-4 (No.YA079)
(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 1000Ω per 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)
0.15 F AC-TYPE |
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PLACE THIS PROBE |
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1500 |
10W |
ON EACH EXPOSED |
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METAL PART |
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GOOD EARTH GROUND
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1FEATURES
•It is a remote controlled colour television.
•Controlling the TV is very easy by its menu driven system.
•It has 2 Euroconnector sockets for external device (such as video recorder, video games, audio set, etc.)
•Stereo sound systems (A2 / Nicam) are available.
•Full function Teletext (Fastext, Toptext, WST).
•It is possible to connect headphone.
•Direct channel access.
•APS (Automatic Programming System).
2.2MAIN DIFFERENCE LIST
•All programs can be named.
•Forward or backward automatic tuning.
•Sleep timer. / . Child Lock. / . T-V Link
•Blue Background / . NTSC Playback.
•Automatic sound mute when no transmission.
•5 minutes after the broadcasting (close down), the TV switches itself automatically to stand-by mode.
•WSS (Wide Screen Signaling)
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Items |
AV-28RT4BU |
AV-28RT4SU |
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CABINET COLOUR |
BLACK |
SILVER |
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Items |
AV-28RT4BU/A |
AV-28RT4BU/B |
AV-28RT4BU/C |
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AV-28RT4SU/A |
AV-28RT4SU/B |
AV-28RT4SU/C |
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MAIN PWB |
VE-20160397 |
VE-20160371 |
VE-20160393 |
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IC500 (MI-COM) |
VE-30029564 |
VE-30029565 |
VE-20173330 |
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IC502 (MEMORY) |
VE-20120610 |
VE-20134092 |
VE-20126318 |
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English, German, French, Italian, |
English, German, French, |
English, German, Czech, Polish, |
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OSD LANGUAGES |
Spanish, Dutch, Portuguese, |
Swedish, norwegian, Danish, |
Hungarian, Bulgarian, |
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Turkish |
Finnish, greek |
Romanian, Croatian |
(No.YA079)1-5
SECTION 3
DISASSEMBLY
3.1DISASSEMBLY PROCEDURE
3.1.1REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 10 screws [A].
(3) Remove the 4 screws [B].
(4) Withdraw the REAR COVER toward you.
3.1.2REMOVING THE BACK DOOR
•Remove the REAR COVER.
(1)Remove the 2 screws [C].
(2)Withdraw the BACK DOOR toward you.
3.1.3 REMOVING THE MAIN PWB
•Remove the REAR COVER.
(1)Remove the 4 screws [D].
(2)Slightly raise the both sides of the MAIN PWB by hand and withdraw the MAIN PWB backward.
[CAUTION]
If necessary, take off the wire clamp, connectors etc. Be careful enough when developing a MAIN PWB.
3.1.4REMOVING THE CHASSIS BASE
• Remove the REAR COVER.
(1) Remove the 2 screws [E].
(2) Remove the CHASSIS BASE.
3.1.5REMOVING THE AV & HEADPHONE PWB
• Remove the REAR COVER.
• Remove the MAIN PWB.
(1) Remove the 2 screws [F].
(2) Remove the AV & HEADPHONE PWB.
3.1.6REMOVING THE FRONT CONTROL PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 3 screws [G], and remove the FRONT CONTROL PWB.
3.1.7REMOVING THE POWER SWITCH PWB
•Remove the REAR COVER.
•Remove the CHASSIS BASE.
(1)Remove the 2 screws [H], and remove the POWER SWITCH PWB.
3.1.8REMOVING THE LED PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 2 screws [I], and remove the LED PWB.
3.1.9REMOVING THE SPEAKER
•Remove the REAR COVER.
(1)Remove the 4 screws [J], and remove the SPEAKER.
(2)Remove the opposite side similarly.
3.1.10 CHECKING THE PW BOARD
•To check the back side of the PW Board.
(1)Pull out the PW Board. (Refer to REMOVING THE MAIN PWB).
(2)Erect the PW Board vertically so that you can easily check the back side of the PWB.
[CAUTION]
•When erecting the PW Board, 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.
3.1.11 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.
1-6 (No.YA079)
REAR COVER
B
(x4)
A
(x10)
CRT SOCKET
PWB
C (x2) |
BACK DOOR |
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CHASSIS FRAME
CHASSIS BASE
E
(x2)
PICTURE TUBE
J
(x4)
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SPEAKER |
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D |
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(x4) |
G |
FRONT CONTROL |
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PWB |
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MAIN PWB |
(x3) |
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H
(x2)
POWER SWITCH
PWB
I
(x2)
LED PWB
Fig.1
F
(x2)
AV &
HEADPHONE
PWB
FRONT CABINET
(No.YA079)1-7
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