Chassis Block Diagrams -3- V1 L1 R1 V2 L2 R2 FV3 FL3 FR3 Vo Lo Ro AV1 AV2 Front AV2 AV Out IC201 IF/Video/Chroma <QXXAVB241M> TELETEXT BOARD IC801 CPU Tuner IC501 V-OUT <LA7841> Q432 H-OUT Q431 H-DRIVE Pcc Circuit Q461-Q462 PICTURE TUBE Q721 Q701 Q711 Video Output H.V T471 FBT DY C515 R518 X161 SAW Filter IC1200 AV SW. <LA7016> IC1201 AV SW. <TC4052BP> IC3501 3D SURROUND <MM1369AD> IC1920 AUDIO CONTROL <TDA8424> IC001 AUDIO OUT <LA4270> 6 7 3 52 36 48 34 24 21 12 38 39 20 19 18 27 23 28 30 R G B BLK R G B BLK 4 2 4 7 2 3 13 10 9 23 1 6 10 11 13 1 3 9 13 2 5 7 10 3 L R L R L R L R 3 Stereo AV1/AV2 TV/AV 3D Surround I 2 C Bus I 2 C Bus I 2 C Bus Mute Speakers Headphones Video out 5.5MHz Aerial IF Band SW Tu SIF-in Video int Ext. V-feedback V-drive H-drive Video-out Sync-in R-out G-out B-out From: CPU AVS Circuit Q653 Q652 IC651 Q684 Q683 5V 12V 9V 25V 140V 24V POWER SUPPLY CIRCUIT 1/5 2/15 4/11 L/R L/R L/R V-out 5.5/6.5MHz X3801 SAW Filter 6 5 1 17 24 8 7 13 14 X3802 IF IF IC3801 SECOND SIF DECODER <LA7577N> 5.742MHz Audio out 2nd Sound 1st Sound IC3401 STEREO/DUAL SOUND PROCESSOR <TDA9840/V2> 12/14 L-OUT L R R-OUT 10 3 2 1 6 Mute Q002 IC1401 PRE-AMP.<NJM4558L> IC1402 P-AMP.<LA4270> SUPER WOOFER 16 7 15 8 IC3451 NICAM DECODER MAIN SIGNAL PROCESSING CIRCUIT Following diagrams show the fundamental block diagrams for AC2 chassis and there- fore differ slightly from actual diagram of each TV set. <QXXAVB488>
17
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Transcript
Chassis Block Diagrams
-3-
V1 L1 R1
V2 L2 R2
FV
3F
L3F
R3
Vo Lo Ro
AV
1
AV
2
Fron
tA
V2
AV
Out
IC20
1IF
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ma
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XA
VB
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IC80
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Q43
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IVE
Pcc
Circ
uit
Q46
1-Q
462
PIC
TU
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Q72
1
Q70
1Q71
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er
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>
IC12
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IC35
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1369
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IC19
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ON
TR
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IC00
1A
UD
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UT
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4270
>
6 7 3 52 36 48 34242112383920191827232830
R G B
BLK
RG
BB
LK
42
4 7 2
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109
23 1 610
11131 3
9132 5
710
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L R
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tere
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Sur
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Bus
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I2 C B
us
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e
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aker
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Hea
dpho
nes
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5.5M
Hz
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ial
IF
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Q65
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4
Q68
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5V 12V
9V 25V
140V
24V
PO
WE
R S
UP
PLY
CIR
CU
IT
1/5
2/15
4/11
L/R
L/R
L/R
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5.5/
6.5M
Hz
X38
01 S
AW
Filt
er
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17 248 7 1314
X38
02
IF
IF
IC38
01S
EC
ON
D S
IF D
EC
OD
ER
<LA
7577
N>
5.742MHz
Audi
o ou
t
2nd
Sou
nd
1st S
ound
IC3401STEREO/DUAL SOUND PROCESSOR
<TDA9840/V2>
12/1
4
L-O
UT
L R
R-O
UT
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21
6
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16 7
15 8
IC34
51 N
ICA
M D
EC
OD
ER
MAIN SIGNAL PROCESSING CIRCUIT
Following diagrams show the fundamental block diagrams for AC2 chassis and there-fore differ slightly from actual diagram of each TV set.
This TV set has a built-in power supply protection circuit.It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormalityoccurs during TV reception, the TV set goes to the stand-by mode.
When an abnormality occurs during TV reception, it causes pin 24 of the CPU to go continually Low(less than0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 15 toswitch off the power supply lines.
Releasing the protective circuit and restoring power supply
To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON againvia either the main power switch or the ON-OFF button on the remote control. This will work only if the powersupply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot berestored and the circuit will have to be repaired.
Protection Circuit
Service Adjustments with Replacing Memory IC(IC802)
-11-
Note: The CPU (IC801) and memory IC (IC802) store the service adjustments data and controls data for each circuit.When the Memory IC(IC802) is replaced, some of the service adjustments should be readjusted to obtain thebest performance. The necessary service adjustments are carried out by using the RC handset. Please setup the TV set with following steps [1] to [3].
[1] Initializing Procedure1. Put a new memory IC.2. Turn on the TV set.3. Press and hold the [TV/AV] button on the TV set more than 2 seconds. The following picture appears on the screen.
4. Press the [FUNCTION] button on the TV set while the above On-Screen Display is still on the screen. The followingpicture appears on the screen.
This completes the initialization of memory IC.
Following shows the initialized contents of memory data by this procedure.- Plug & play : No executed- Inhibit data : Cancelled- Ch skip data : Cancelled- Set volume control value to 10/63 steps.- Set all of control values in PERSONAL mode to initial value shown in below table.
Further adjustment please refer to “Service adjustment-1” on page 14-15.
Following table shows the initial values which have been stored in the CPU ROM, and items for the service adjust-ments.
Notes:+ The initial value that the CPU writes down the CPU ROM data to the memory when replaced the memory IC. TV set
may not operate correctly with this initial value. It is required to set up the fine adjustment for service adjustmentsdescribed in the above.
No. Item Initial value Range Description
01 H-P 8 0~15 Horizontal centre adjustment02 V-P 4 0~7 Vertical centre adjustment03 V-S 80 0~127 Vertical size adjustment04 OSD 1 0~15 OSD position adjustment05 AGC 64 0~127 RF AGC adjustment06 VCO 128 0~255 VCO (AFT) adjustment07 SIF 0 0~3 SIF VCO adjustment08 SELF 0 0~15 SELF-adjusting 09 DLT 2 0~3 DL-time adjustment10 DLF 0 0, 1 DL-fine adjustment11 B-ST 0 0, 1 Black stretch on/off setting12 ABCL 1 0, 1 ABCL adjustment13 AB-G 0 0, 1 ABCL gain adjustment14 TRAP 3 0~3 Trap frequency adjustment15 WBK 0 0, 1 White back setting16 BBK 0 0, 1 Blue back setting17 AFCG 2 0~2 AFC gain adjustment18 RBI 0 0~255 Red bias adjustment19 GBI 0 0~255 Green bias adjustment20 BBI 0 0~255 Blue bias adjustment21 RD 64 0~127 Red drive adjustment22 BD 64 0~127 Blue drive adjustment23 DRV -- -- White balance adjustment24 -- -- -- Y-cut setting
Service mode adjustments table in CPU ROM
Grey scale adjustment
-13-
[Entering to Service Mode]1. Press and hold the [FUNCTION] button on the TV set and press the [1] button on the remote control handset.
Following setting setting items appears on the screen.
2. Select item by pressing the [OFF TIMER] or [MUTE] button on the remote control handset.3. Adjust value by pressing the [VOLUME +] or [VOLUME - ] button on the remote control handset.
To return to normal TV mode, press the [FUNCTION] button on the TV set or on the remote control handset.
[3] Special Function Setting1. Following items should be set up in the special function mode, please refer to “Special Functions” on page 15 for
actual setting up.
- Volume Lock : OFF- Tuning Lock : OFF- AV Start : OFF- Blue Back : OFF- Music Mode : OFF
2. Confirm following system setting by pressing [RECALL] button on the remote control handset.
- Colour system : AUTO- SIF system : S-1
*Note: There may be not available the above function depending on the specification of TV set.
0010010
05 AGC 63
Item No. Item
Read Status
Data value
0010010
23 DRV R 64 B 64
Item No. Item
Read Status
Data value for Red
Data value for Blue
Display for [DRV] White balance adjustment
Display for [AGC] AGC adjustment
-14-
Service Mode Adjustments
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to normal.(3) Select [H-P] in the service mode.(4) Change value to be optimum horizontal centre position.(5) Exit from the service mode.
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to normal.(3) Select [V-P] in the service mode.(4) Change value to be optimum vertical centre position.(5) Exit from the service mode.
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to normal.(3) Select [V-S] in the service mode.(4) Change value to be optimum vertical size.(5) Exit from the service mode.
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to normal.(3) Select [OSD] in the service mode.(4) Change value to be proper OSD position.(5) Exit from the service mode.
NOTE: Do not attempt this adjustment with weak signal.(1) Tune the receiver to most clearest (or strongest) VHF
station in your area. Set the brightness and contrastcontrols to maximum. Set the colour control to mini-mum.
(2) Select [AGC] in the service mode.(3) Change value until the snow noise just disappears.(4) Exit from the service mode.
(1) Input the SG signal to collector of Q101.SG signal frequency : 38.9MHzSG signal level : 70 dB
(2) connect a short clip between the base of Q101 andground.
(3) Connect oscilloscope to pin 2 of IC201.(4) Select [VCO] in the service mode.(5) Change value until the voltage to be 4.5 ± 1.0V.(6) Exit from the service mode.
(1) Tune the receiver to the clearest station with SystemB/G(5.5MHz) in your area.
(2) Connect DC voltmeter to pin 46 of IC201 and ground.(2) Select [SIF] in the service mode.(3) Change value until the voltage to be about 3.0 V.(4) Exit from the service mode.
Item 07 [SIF] SIF
Item 06 [VCO] AFT
Item 05 [AGC] AGC
Item 04 [OSD] OSD POSITION
Item 03 [V-S] VERTICAL SIZE
Item 02 [V-P] VERTICAL CENTRE
Item 01 [H-P] HORIZONTAL CENTRE
Horizontal centre
Vertical centre
Vertical size
ADJUSTMENT-1Following adjustments should be carried out when the memory IC is replaced. How to enter the service mode andadjust values, please refer to “ Entering to Service mode” on page 13.
-15-
(1) Receive the monochrome circular pattern.(2) Set the brightness and colour to normal, contrast to
maximum.(3) Enter to the service mode.(4) Set each value of [RBI], [GBI], [BBI] mode to 0. Set each
value of [RD], [BD] mode to 64.(5) Select next of [DRV] mode to be one horizontal scan-
ning line and turn the screen volume on the FBT toobtain just visible one coloured line.
(6) Press the [1], [2], [5], [6], [9] or [0] button to adjust thebrightness of each colour until a dim white line pro-duced. Please see the control button allocations in thismode.
(7) Select [DRV] mode to enter the white balance adjustingmode.
(8) Press the [3], [4], [-/--] or [RECALL] button alternate-ly to produce normal black and white picture.
(9) Exit from the service mode.(10) Check for proper grey scale tracking at all brightness
levels.NOTE: If the grey scale adjustment is made after picture
tube replacement, check the high voltage.
Items 18-24 GREY SCALE
i
Y ?
X
TXT/TV
0
7
1
4
8
5
2 3
6
9
BASS
JXMKM
PIC MODE
SWAP
F
-/--
P P
TV/
A•B
CH SCAN
TIMER
SURROUND
P
SYSTEM
(1) Connect DC meter to TP-B and the ground.(2) Set the brightness and contrast to normal.
Tune the receiver to an active channel and synchro-nized picture.
(3) The B-voltage must be 140 ± 1 volt DC.
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to maximum.(3) Connect a high voltage probe to anode lead of the pic-
ture tube.(4) The high voltage must be 29KV ± 1KV and less than
32KV at 0 beam current.
NOTE:If the picture tube is replaced, check the high voltage.The horiz. width adjustment affects the high voltage.Therefore, re-check the high voltage.
(1) Receive the monochrome circular pattern.(2) Set the brightness and contrast to normal.(3) Adjust VR462 for optimum horizontal width.
HORIZONTAL WIDTH
HIGH VOLTAGE CHECK
B-VOLTAGE SUPPLY CHECK
ADJUSTMENT-2Following adjustments are not required to readjust when replacing the memory IC.
2. By using T3802, adjust “P”to be on the top of waveform.
Adjustment Waveform
P
A
0V
(38.9 MHz)
Tools
10KΩ
0.002µ a
b1KΩ75Ω
GNDGND
Input probe Output probe
(1) Receive a stereo broadcast.(2) Connect oscilloscope to TPJ3804.(3) By using T3801 DC voltage to be 4.0V.
4.0Vp-p
0V
SIF Alignment
FM Detector Adjustment
-17-
Pilot Alignment
Setting
Oscilloscope
Input sound signal sourceTV systemDeviationMode
TPJ3405(IC3401-Pin5)
System B/G27kHzStereo
By using T3401, adjust amplitude to be maximum.
Adjustment Waveform
A
Stereo Separation Adjustment
Separation-1
Setting
Oscilloscope
Input sound signal sourceTV systemDeviationModeModulation
Audio Monitor Out-Right Jack(K12RC3) on theBack unit.
System B/G27kHzStereoRight 1kHzLeft None
(1) Press and hold the FUNCTIONkey on the TV set, and pressthe “4” key on the Remote Control Transmitter to enter toK1 service mode.
Adjustment Waveform
A
(2)Adjust “A” to be 1.4Vp-p±0.25Vusing the LEVEL UP or DOWNkey on the Remote ControlTransmitter.
ADJUST DATA
K1 -002
Separation-2
Setting
Oscilloscope
Input sound signal sourceTV systemDeviationModeModulation
Audio MonitorOut-Left Jack(K12RC3) on theBack unit.
System B/G27kHzStereoRight 400HzLeft None
(1) Press and hold the FUNCTIONkey on the TV set, and pressthe “4” key on the Remote Control Transmitter to enter toK1 service mode.
(2) Select K2 mode, by pressingthe FUNCTION key. (RC or TV)
Adjustment Waveform
B
K1 Service Mode
To exit from the service mode, press the RECALL button.
ADJUST DATA
K2 -011
K2 Service Mode
(3) Adjust “B” to be minimum using LEVEL UP or DOWN key on the Remoto Control Transmitter.
-18-
Purity and Convergence Adjustment
RED
BLUE
Adjust tabs together tosuperimpose red andblue horizontal line.
Figure- 2 BLUE AND RED LINE MOVEMENT Figure- 3 BLUE/RED AND GREEN MOVEMENT
Adjust tabs together tosuperimpose red/blueand green horizontalline.
Adjust tabs angle to superimposeblue and red vertical line.
Adjust tabs angle to superimposered/blue and green vertical line.
GREEN
BLUE / RED
CAUTION: The Convergence and Purity adjustments have been made at the factory. Readjustmentshould be made only after picture tube or deflection yoke replacement, following the steps below:
PURITY ADJUSTMENT1. Demagnetize the picture tube and receiver using an external
degaussing coil. When replacing picture tube or deflectionyoke, mount deflection yoke and purity-convergence magnetsassembly properly, see figures 1 and 4.
2. Turn Red and Blue guns off and provide only Green raster.Rotate Screen control to fully counterclockwise. Rotate Redand Blue Bias controls fully counterclockwise. Slowly rotateGreen Bias control clockwise to produce Green raster.
3. Loosen the screw holding the Deflection Yoke and remove the3 Rubber Wedges, and slide the Deflection Yoke fully forward.
4. Rotate and spread the Tabs of the two Purity Magnets to cen-tre the vertical green belt in the picture screen. The PurityMagnets are also adjusted to obtain vertical centring of theraster.
5. Slowly slide the Deflection Yoke backward until a uniformgreen screen is obtained.
6. Check the purity of the red and blue screens for uniformity,turn off other colours to check this (use bias controls).Readjust the yoke position if necessary until all screens arepure.
7. Adjust each Bias control and screen control to obtain whiteraster. Refer to Gray Scale Adjustment. If part of the picturescreen is coloured, adjust the Deflection Yoke position forwardor backward slightly.
8. Tighten the mounting screw of the Deflection Yoke. AdjustConvergence next.
CENTRE CONVERGENCE ADJUSTMENT1. Use a dot crosshatch pattern signal.2. Turn Red and Blue guns on and turn off Green gun. Adjust the
angle between the Tabs of the Four Pole Magnet 1 and 2, andsuperimpose the Red and Blue vertical lines in the centre areaof the picture screen. Refer to figure 2.
3. Keeping the mutual angle of the Tabs of the Four Pole Magnetturn them together to superimpose the Blue and Red horizon-tal lines in the centre area of the picture screen. Refer to fig-ure 2.
4. Turn Green gun on and adjust Six Pole Magnet 3 and 4 thatthe Green line superimposed on the Red/Blue lines.This is the same procedure used in steps 2 and 3.Refer to figure 3.
OUTER AREA CONVERGENCE ADJUSTMENTSlightly loosen the screw holding the Deflection Yoke. Adjust theDeflection Yoke to converge the detail in the outer area (left sideand right side) of the picture screen by orbital movement of thefront of the Yoke, then secure the Deflection Yoke in appropriateposition by putting the wedges as illustrated. Tighten screw hold-ing the Deflection Yoke.