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Part No. SKSM0794 C7VDS MARCH 2005
Colour Television
Service Manual
Model CE28DFN3-B
Service Ref. No. CE28DFN3-B-00
PRODUCT CODE: 111361003
ORIGINAL VERSION: Chassis No. EB8-D
Give complete "SERVICE REF. NO." for parts
order or servicing, it is shown on the rating sheet
on the cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission
system and power source differ from the design
specifications. Refer to the specifications for the
design specifications
CE28DFN3-B
Contents
Safety precautions/Specifications ..................................................................................................................2
Block diagrams ..............................................................................................................................................3
Cabinet Disassembly......................................................................................................................................4
Adjustment and Repair Procedures............................................................................................................5~9
CPU Functions ..............................................................................................................................................................................10~1 1
Component Locations ..................................................................................................................................12
IC Block Diagrams..................................................................................................................................13~15
Pin description of semiconductors................................................................................................................16
Part Description and reading of schematic diagram ....................................................................................17
Cabinet Parts List ........................................................................................................................................18
Electric Parts List....................................................................................................................................19~24
Please use Schematic Diagram SKP20528
with this Service Manual.
+
-
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C7VDS
SAFETY PRECAUTION
X-RADIATION PRECAUTION
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially
constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube
must be the same type as the original including suffix letter. Excessive high voltage may produce potentially
hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit.
Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds
specified limits, take necessary corrective action. Carefully follow the instructions for +B1 volt power supply
adjustment, and high voltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
SPECIFICATIONS
Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list in
this manual be used for component replacement designated by mark . No deviations from resistance wattage
or voltage ratings may be made for replacement items designated by mark .
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, on
the chassis or the picture tube.
3: When replacing a chassis in the cabinet, always be
certain that all the protective devices are installed
properly, such as, control knobs, adjustment covers
or shields, barriers, isolation resistor-capacitor networks
etc. Before returning any television to the customer,
the service technician must be sure that it is completely
safe to operate without danger of electrical shock.
Power source AC 220~240V, 50Hz
Television system System I
Colour system PAL/NTSC4.43 (PAL/NTSC4.43/NTSC3.58 IN AV MODE)
Receiving channel UHF: #21~69
Aerial input impedance 75ohm
Rear AV terminal
AV1: CENELEC standard
INPUT: Composite video, RGB and Audio L/R
OUTPUT: TV-output with composite video and audio L/R
AV2: CENELEC standard
INPUT: Composite video, RGB, S-VHS and Audio L/R
OUTPUT: Monitor output with composite video and Audio L/R
Front AVterminal
AV3: RCA jacks
INPUT: Composite video and Audio L/R
Sound output(Music) 12 x 2
Dimensions (WxHxD) 786 x 519 x 500mm
Weight 34.8 Kg
!
!
!
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C7VDS
BLOCK DIAGRAM
This is a diagram for all models and therefore differs slightly from the actual block diagram.
CI SLOT
1AV4U20B64200
DIGITAL
SPK - L
PL8004
PL8003
PL8002A PL8006
PL8002B
PL8005
TUNER
K2 - 6V SUPPLY - PL8004
K4 - COMM - PL8002A
K16F
1AA0B10E689AA 1AA0B10E689AB
K2
KH
KA
1AA0B10H068PA K5
MAIN UNIT DIGITAL MODULE
A101
K4
K9
K4A KP
K3
K4B
KQ
K16E - DEGAUSSING
K4B (VERTICAL) RF IN
PWB SOCKET
1AA0B10H068PB
K4A (HORIZONTAL)
K16E
FRONT UNIT A FRONT UNIT B
ON/OFF
K19H SPK - R
K16FF K1103
KF
240VAC
K7P K3 - AUDIO - PL8003
KQ K7Q K9 - VIDEO - PL8002B
KP K7P K5 - GND - PL8005
K7Q
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C7VDS
(A)
(A)
CABINET DISASSEMBLY
CABINET BACK DISASSEMBLY
1. Remove 9 screws(A) for 28”
2. Pull out the cabinet back.
(A)
(A)
(A)
(A)
(A)
(A)
(A)
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C7VDS
OPTION SETTING
[After replacing the Memory IC (IC801)]
The memory IC, IC801, stores the option data of TV set and service adjustments data for each circuit, therefore,
when the memory IC is replaced, it should be programmed to the following settings and “SERVICE ADJUSTMENT”
on pages 6 to 9.
To enter to the Option Mode
+ Press and hold the F/OK button on the remote control and P▼ button on the front panel of the TV. The option
window will appear on the screen.
To set the Option Mode
+ Highlight the desired option item by using the P▲ or P▼ button .
+ To switch the option mode, use the
Volume - (LEFT) or Volume + (RIGHT) button.
+ The data which is set in the option mode is stored into the memory IC automatically.
The following table shows the available option items and default setting mode.
Exit from the Service Mode
+ Press the MENU button.
Option Mode Mode Description & Note
SORT MODE SORTING or Tuning mode, default “SORTING”
TUNING
PLUG & PLAY ON or OFF Plug & Play mode, default “ON”
WELCOME TEXT ON or OFF Display message when first set up, default “ON”
AUTO VOLUME ON or OFF Auto volume default “OFF”
SURROUND ON or OFF Surround sound default “ON”
VIRT SUB WOOFER ON or OFF Virtual Sub Woofer default “ON”
WIDE ON or OFF Wide mode, default “ON”
AV3 ON or OFF Front AV disable, default “ON”
OPTION MODE FOR CE28DFN3-B-00
OPTION
SORT MODE SORTING
PLUG & PLAY ON
WELCOME TEXT ON
AUT O VOLUME OFF
SURROUND ON
VIRT SUB WOOFER ON
WIDE ON
AV3 ON
ADJUST : EXIT : RECALL
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C7VDS
SERVICE ADJUSTMENTS
After replacing the Memory IC (IC801)]
The memory IC, IC801, stores the service adjustments data for each circuit, therefore, when the memory IC is
replaced, it should be programmed by using “OPTION SETTING” on previous page and the following adjustments.
ADJUSTABLE SERVICE ADJUSTMENT
Item No. OSD Description
6 Screen adjustment
151 WPR - N R - Drive adjustment
152 WPG - N G - Drive adjustment
304 AGC Take Over AGC adjustment
314 TXT - H - POS OSD Positioning adustment
IMPORTANT NOTICE
Do not attempt to adjust service adjustments not listed above otherwise it may cause loss of performance and product safety.
GEOMETRY SERVICE DATA
Service Item Number. Symbol 1 Symbol 2
13
14 A02
15 A03
16 A04
17 A05
18 A06
19 A07
20 A08
21 A09
22 A10
23 A11
24 A12
25 A13
26 A14
27 A15
28 A16
29 A17
30 A18 H BLK SW
31 A19 H BLK L
32 A20 H BLK R
33 A21 OSVE
34 A22 EVB
35 B02
36 B09
37 B10
38 B11
39 B12
40 B13
41 B14
42 B15
43 B16
44 B17
A01
Track. mode 50Hz Full
Vert. Zoom 50Hz Full
Vert. Slope 50Hz Full
Vert. Shift 50Hz Full
Vert. Ampl. 50Hz Full
S-Corr. 50Hz Full
V.Lin.Ctrl. 50Hz Full
V.Linearity 50Hz Full
EW Width 50Hz Full
Hor. Shift 50Hz Full
EW Parabola 50Hz Full
Trapezium 50Hz Full
UC Parabola 50Hz Full
LC Parabola 50Hz Full
Hor. Bow 50Hz Full
Parallel 50Hz Full
Vert. Scroll 50Hz Full
Vert. Zoom 50Hz Natural / or 4:3 squeeze mode
EW Width 50Hz Natural / or 4:3 squeeze mode
Hor. Shift 50Hz Natural / or 4:3 squeeze mode
EW Parabola 50Hz Natural / or 4:3 squeeze mode
Trapezium 50Hz Natural / or 4:3 squeeze mode
UC Parabola 50Hz Natural / or 4:3 squeeze mode
LC Parabola 50Hz Natural / or 4:3 squeeze mode
Hor. Bow 50Hz Natural / or 4:3 squeeze mode
Parallel 50Hz Natural / or 4:3 squeeze mode
Vert. Scroll 50Hz Natural / or 4:3 squeeze mode
Frequency Wide Mode
50Hz Full
50Hz Full
50Hz Full
50Hz Full
50Hz Full
Explanation
Track. Mode(HCO)
Vertical zoom
Vertical slope
Vertical shift
Vertical amplitude
S-correction
V.Lin.Ctrl.
V.Linearity
EW width
Horizontal shift
EW parabola/width
EW trapezium
EW upper corner parabola
EW lower corner parabola
Horizontal bow
Horizontal parallelogram
Vertical Scroll
RGB blanking mode
Timing of wide blanking front(WBF)
Timing of wide blanking rear(WBR)
Black current measuring lines in overscan
Extended vertical blanking
Vertical zoom
EW width
Horizontal shift
EW parabola/width
EW trapezium
EW upper corner parabola
EW lower corner parabola
Horizontal bow
Horizontal parallelogram
Vertical Scroll
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C7VDS
To enter to the Service Mode
+ Press and hold the GREEN button on the remote control and then press the P▼ button on the cabinet.
To select the service item and change data value
+ To select the adjustment item, use the P▲ or P▼ button.
+ To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button.
+ The data which is set in the service mode is stored into the memory IC automatically.
SERVICE MODE
SERVICE SERVICE SOFTWARE
ITEM ITEM VERSION
NUMBER DESCRIPTION
Exit from the Service Mode
+ Press the MENU button or turn off the TV set by using the Mains switch.
INITIALISATION OF MEMORY IC
To initialise the memory IC (IC801), press and hold the NORMAL button on the remote control, then press
the P▼ button on the front panel of the TV set. The tv set will switch into standby mode. Turn the Mains switch Off
and On, then switch on from standby. The initialisation is now completed.
When initialised the memory IC and all of the setting data (option data and service adjustment data) stored in the IC
are reset to the default value. It is necessary to set the option settings and readjust the service adjustments listed in
this manual and to re-tune all the channels.
SERVICE
000 EB8D 3_52
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C7VDS
ADJUSTMENTS
IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except when adjustments are required in servicing
otherwise it may cause loss of performance and product safety.
1. Receive white raster pattern.
2. Set controls to normal.
3. Connect digital voltmetre to test point TP-B and GND.
4. Adjust voltage to 150 ±0.5V by using VR641.
1. Input and tune an RF signal which is UHF to the clearest station.
2. Connect digital voltmetre to test point TP-A and GND.
4. Enter the service mode and select item no. 304. AGC
TAKE OVER
5. Press the LEVEL+ or LEVEL - button to adjust volt-
age to be 3.2Vdc.
By using FOCUS VR, adjust focus control for well
defined scanning lines.
SCREEN ADJUSTMENT
1. Enter the service mode and select item no. 6.
COLLAPSED LINE
2. Turn screen VR until collapsed line is just visible then
stop turning. Press menu key on remote control to exit
the service mode.
DRIVE ADJUSTMENT
3. Select item no.151. WPR - N (R-Drive) or 152. WPG -
N (G-Drive) and adjust both initially to 20.
4. Change data value of each item by using LEVEL + or
LEVEL - button to obtain the proper white balance.
PCC ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 23. EW
PARABOLA
3. Press the LEVEL+ or LEVEL - button to adjust the
vertical line to be straight.
TRAPEZOID ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 24.
TRAPEZIUM
3. Press the LEVEL+ or LEVEL - button to correct the
trapezum distortion of the vertical line.
PCC ADJUSTMENT
GREY SCALE ADJUSTMENT
FOCUS ADJUSTMENT
AGC ADJUSTMENT
+ B VOLTAGE ADJUSTMENT
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C7VDS
CORNER ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 25. UC
PARABOLA for top corner adjustment OR item no.
26. LC PARABOLA for bottom corner adjustment.
3. Press the LEVEL+ or LEVEL - button to correct the
distortion of the vertical line around the corners.
HORIZONTAL CENTRING ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 22. HOR.
SHIFT.
3. Press the LEVEL+ or LEVEL - button to adjust the
horizontal centre.
HORIZONTAL WIDTH ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select item 21. EW
WIDTH.
3. Press the
LEVEL+ or LEVEL - button to adjust the
horizontal width.
1. Receive circular pattern and set screen mode to
“FULL”.
2. Set controls for brightness and contrast to maximum.
3. Connect high-voltage meter to the anode of CRT and
GND.
4. Confirm that voltage is 26 kV ±1.0kV at maximum
beam current 1.2mA ± 0.05
VERTICAL CENTRING ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no.16.VERT
SHIFT.
.3 Press the LEVEL+ or LEVEL - button to adjust the
vertical centre.
VERTICAL HEIGHT ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 17. VERT
AMPL.
3. Press the LEVEL+ or LEVEL - button to adjust the
vertical height.
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter the service mode and select item no. 314. TXT H - POS.
3. Press the
LEVEL+ or LEVEL - button to adjust
proper OSD positioning.
OSD POSITIONING ADJUSTMENT
VERTICAL ADJUSTMENT
HIGH-VOLTAGE CONFIRMATION
HORIZONTAL ADJUSTMENT
314 TXT - H - POS 7
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C7VDS
CPU PORT FUNCTIONS
Pin No Function Name Function In/Out
1 VSS Gnd -2 VSS Gnd
3 1v8_1 1.8v Supply -4 3v3 3.3v Supply -5 Vref 3.3v Reference -6 Vref V Ref Gnd -7 Vref 3.3v Reference -8 Vref V Ref Gnd --
9 Vref 3.3v Reference -10 XTAL IN Clock Oscillator In
11 XTAL OUT Clock Oscillator Out
12 Vss Gnd -13 Vguard sw -14 Dec Dig 1.8v source supply Out
15 5v 5v Supply -16 Phi 2 Phi 2 -17 Phi 1 Phi 1 -18 Gnd Gnd -19 Sec pii -20 Dec BG -21 EW Drive parabola out Out
22 VdrB Vertical drive B Out
23 VdrA Vertical drive A Out
24 Vif 1 Vision IF 1 In
25 Vif 2 Vision IF 2 In
26 Vsc -27 I Ref Reference current -28 Gnd Gnd -29 Sif 1 Sound IF 1 In
30 Sif 2 Sound IF 2 In
31 Agc Auto matic gain control In
32 Eht Eht In
33 SSif/Ref Iin/Avl/Ref Out -34 Audio in Scart L In
35 Audio in Scart R In
36 Audio Out Scart L Out
37 Audio Out Scart R Out
38 -39 Qsso/Amo/AudioEm -40 Gnd -41 PLL IF Phase Lock Loop If -42 SifAgc SifAgc -43 IFVo Scart 1 Video Out
44 FmRo -45 V8Audio Switches -46 AgcsSif -47 V5P2 5v Supply -48 Svo/IfVo/Cbvs1 Scart 2 Video Out
49 Audio4 L In Scart 2 Audio L In
50 Audio4 R In Scart 2 Audio R In
51 Y4/Cvbs4 Av3 Video In
52 C4 -53 Audio2InL Av3 Audio L In
54 Audio2InR Av3 Audio R In
55 Cvbs2/y Scart 1 Video In
56 Audio3InL -57 Audio3InR -58 Y3/Cvbs Scart 2 Video In
59 C3 Scart 2 Chroma In In
60 Audio Out L SL Audio out Left Speaker Out
61 Audio Out L SR Audio Out Right Speaker Out
62 Audio Out HPL Scart Audio L Out 2 / monitor Out Out
63 Audio Out HPR Scart Audio R Out 2 / monitor Out Out
64 Pip --
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C7VDS
CPU PORT FUNCTIONS (continued)
Pin No Function Name Function In/Out
65 SVM Scan Velocity Modulation Out
66 FbiSo Flyback In SandCastle Out In/out
67 Hout Horizontal Drive Out Out
68 VssComb Gnd
69 V5Comb 5v Supply -70 Vin/R2/Pr Scart 2 R-In In
71 Uin/B2/Pb Scart 2 B-In In
72 Yin/G2/Y Scart 2 G-In In
73 Y Sync Y Sync In
74 Y out Yout Out
75 Uout/Fb in Scart 2 Fast Blanking In
76 Vout/Sw01 -77 Fbl3 Scart 1 Fast Blanking In
78 R3/Pr Scart 1 R-In In
79 G3/Y Scart 1 G-In In
80 B3/Pb Scart 1 B-In In
81 Gnd 3 Gnd -82 V5P3 5vSupply -83 BCL Beam Current Limiting In
84 Iblack -85 Rout Red Drive Out
86 Gout Green Drive Out
87 Bout Blue Drive Out
88 V3.3A1 3.3v Supply -89 RefAdn Ref Gnd -90 V3.3RefAdp 3.3v Supply -91 RefAd -92 GndA Gnd -93 V1.8A 1.8v Supply -94 V3.3A2 3.3v Supply -95 VssAdc Gnd -96 V1.8Adc 1.8v Supply -97 Into Remote control In In
98 P10/Int1 SCl In/out
99 P121/TO SDA In/out
100 V1.8C2 1.8v Supply -101 VssC2 Gnd -102 P04/I2Sws -103 P03/I2SCLk -104 P02/I2SDOC -105 P01/I2SDOC -106 P00/I2SDi1 StandBy Out
107 P13/T1 On/Off Out
108 P16/SCL SCL In/out
109 P17/SDA SDA In/out
110 V3.3P 3.3v Supply -111 P20/Tpwm Relay On/Off Out
112 P21/Pwmo LED Drive Out
113 STATUS Status In/out
114 ALK Alk In/out
115 P30/Adco Scart 1 Pin8 Function In
116 P31/Adc1 Scart 2 Pin8 Function In
117 V1.8C1 1.8v Supply -118 DecV1v8 1.8v Supply -119 P32/Adc2 AGC In
120 P33/Adc2 Key scan in In
121 VssC1+P1 Gnd -122 P24/Pwm3 Audio Mute Out
123 P25/Pwm4 L/L’ switch (Export only) Out
124 V1.8C3 1.8v Supply -125 Vssc3 Gnd -126 P12/Int2 -127 P14/Rx Power Fail In
128 P:15/Tx Natural Wide Switch