Daewoo DSJ-4720CRU User manual

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Caution
: In this Manual, some parts can be changed for improving. their
performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List)in
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DAEWOO ELECTRONICS Corp.
Service Manual
Aug. 2004
S/M No.:DSJ113FEFO
REAR PROJECTION TV
CHASSIS : SJ-113
MODEL : DSJ-4710CRU/4720CRU

Contents
1. Safety Instruction 2
2. Product Specification 4
3. Remote Control 5
4. Adjusting Method 6
5. IC Description 12
6. Trouble Shooting 30
7. Service Part list 36
8. Schematic Diagram
1) Block Diagram 51
2) Power 52
3) Convergence Amp 53
4) Convergence Module 54
5) CRT Amp 55
6) IF Module 56
7) AV Main 57
8) Micom Module 58
9) Control & Union 59
9. PRINTED CIRCUIT BOARD
1) Main PCB 60
2) Power PCB 61
3) Convergence Module 62
4) IF Module 63
5) CRT PCB 64
6) Union PCB 65
10. EXPLODED VIEW
1) DSJ-4710CRU 66
2) DSJ-4720CRU 67
1

2
1. Safety Instruction
1. When all services are carried out, every item required in this manual needs to be followed
and the services should be performed by A/S man.
2. The following general items should be performed before staring the services.
1) Unplug the power.
2) Uncover the cabinet.
3) To prevent a danger of shock, touch a terminal of plug on the chassis ground and discharge
a remaining voltage.
4) Check if all parts are in the proper places, omitted or burned.
5) Check the soldering state of all parts, if a clad copper is loose or peeled off and if there is a
short between clad coppers.
6) When all the articles mentioned above are normal, plug the power and refer to “Fault
diagnosis according to cause and symptom” of this manual for service according to screen
state.
3. Pay attention to a basic wiring and check a damaged part if a disconnected circuit is found
and replace it with a new one.
4. The equal rated parts should be used depending on the parts list of this manual when a part
needs to be replaced. Because some electronic parts and appliances have safety-related
features, an electric shock, file or X-RAY radiation can be caused if no equal rated parts are
used.
5. When a part needs to be replaced and soldered on PCB, the part should be inserted in the
right position and not contact with even a terminal of other part. Especially, a high voltage
resistance should be inserted with 10mm away from the PCB.
6. Since approx. 30KV high voltage is applied to the Braun tube in operating the TV set, a little
X-RAY can be radiated. If the voltage is too high, harmful X-RAY can result in a danger.
Therefore, A/S man with sufficient knowledge about high voltage needs to perform the
service. Especially, be sure to discharge the anode of the Braun tube on the chassis ground
of TV set before starting the repair.
7. Examine the followings before finishing the service.
1) Check if all protecting components have been assembled.
2) Keep the lead line away from high voltage or high temperature parts and check if all wires
have been connected.
3) Check a leakage current to protect a user from a shock.
Observances for safe service

3
8. How to check a leakage current
1) Plug the power directly.
2) After connecting 1.5 ohm 10W resistance and 0.15uF condenser in a row, link one with an
exposed metal part of TV set and earth the other (proper earth place such as water pipe).
9. A couple persons or more should perform the repair.
When a back cover needs to be separated, pull it out about half and remove the power cord
before complete uncovering.
10. Remove the anode cable which is fixed at HVG in separating the anode cable from HVG or
replacing CRT or HVG. Because a high voltage charged in the anode isn’t discharged
completely even though the AC power cord is removed, the high voltage can be sent to TV
set via the power cord and cause its damage. Therefore, be sure to observe the following
method in replacing a high voltage cable.
1) How to remove a high voltage cable
a. Make a discharger to discharge a high voltage.
b. Remove the power cord and wait for 30 sec.
c. Remove the anode cable after discharging as the method mentioned below.
2) How to produce
a. Solder MW resistance and clip lead.
b. Place the soldered part on a driver to tap.
3) How to discharge
a. Connect the clip with CRT NET GND.
b. Pull upward the anode cable slightly, giving a proper force to both nippers of the high
voltage plug locked in HVG. Then, the HVG is removed from the high voltage cable. Be
careful not to destroying the HVG plug socket which connects the high voltage plugs by
giving an excessive force to the nippers in the course.
c. To discharge a high voltage, contact the discharger with a peeled wire at the end of the
anode cable which is removed from HVG.
d. When separating the high voltage plug from the high voltage cable, put both tips of a
pincette in the plug and pull the plug to the end of the high voltage cable.

4
2. Specifications
Model DSJ - 4710CRU/4720CRU
Band I : CH02 ~ CH04
VHF Band II : CH05 ~ CH12
Receipt Channel Cable Band : S1’ ~ S3’, S1 ~ S20
UHF Hyper Band : S21 ~ S41
Band IV, V : CH21 ~ CH69
Screen Size 119cm(47”)
Signal Method PAL B/G, I/I, SECAM B/G, D/K, L/L’
Speaker Output 10W / ch (Main L/R)
Power 220-240V ~, 50/60Hz
Power Consumption 195W
1110 x 1210 x 533mm(4710)
Dimension (W/H/D) 1110 x 1210 x 530mm(4720)
Weight 62kg(47”)

5
3. Remote Control
VIRTUAL
DOLBY
PICTURE ASPECT
DISPLAY
MODE
DYNAMIC
BASS
ZOOM
OK
STILL
SOUND
MODE
Power
Recall
Program number (0-9)
Use to select channel directly 0~9
Sleep
This feature is used to set up the time of
automatic turn off.
Sound mode
This feature allows you to choose the mode.
Each time the button is pressed, it rotates from
Normal -> News -> Music -> Movie -> Favorite.
Still
Menu
Use it to make picture adjustment, screen
format,sound adjustment, function, install.
Zoom
Off. Zoom1, Zoom2
Program ▲/▼
OK
Childlock
Mono, Forced Mono, Stereo, Sub-
sound
Virtual dolby
Picture
Normal, Movie, Favorite
Aspect
16:9, Panorama, 4:3
Display mode
100Hz, Progressive
VOLUME ◀/▶
Dynamic bass
Mute
AV1 / AV2 / S-VHS2 / AV3
/ AV4(S-VHS4)
/Component/RF
Page Up
Red
Green
Text/TV
Reveal
Subpage
Hold
Page Down
Blue
Yellow
Size
Cancel
Index
Mix

6
4. Adjusting Method
Adjustment of temporary ITC
Step 1. Temporary fixation of DY
1) Insert DY in R, G, B CRT and tighten the screws properly with DY pushed upward to the end
(Refer to Figure 1)
2) Adjust the slant and position of DY so that the rectangle projections of DY are shown in front
of the set.
(Figure 1. Front part of CRT assembly)
Step 2. Fixation of VM coil
1) Tighten the screw completely with R, G, B, VM coil pushed upward to the end (Refer to
Figure 1)
Applied chassis and model:SJ-113/DSJ-4710(20)
DY rectangle
projection GENTERING MAGNET VM COIL

7
Adjusting Method
Completion of control
- All adjustments need to be performed after for 1hour or more.
- Heat-run is executed in the state of non-signal noise.
- If a retrace line appears on the screen during heat-run, rotate the screen VR left and carry out
heat-run when it disappears.
- Note) If stop image is kept over 10 min, a fluorescent material of CRT can be damaged.
Step 1. Control of screen voltage
1) Press the S9 key of Service Remote Control when set’s on.
2) Select PICTURE OFF & VERTICAL OFF. After turning the screen VR of focus pack right,
slowly rotate it left when a horizontal line appears and fix it when the line disappears
completely.
3) Control Red VR, Green VR and Blue VR in the order.
4) Fix the VR by lock paint after the control is completed.
Note) This control should be performed in a darkroom.
Step 2. Control of P-Lens focus
1) Receive RETMA pattern.
2) Loose the fixing nut of lens.
3) Rotate the fixing nut of lens left and then right slowly. Fix the optimum focus position by
repeating this method.
Note 1) Control the focus on the basis of 6cm by 6cm (intra-office signal 8CH, No.3) at the
left bottom of the screen.
Note 2) Perform the focus readjustment or correction if the entire screen isn’t focused even
after the completion of focus control.
Applied chassis and model:SJ-113/DSJ-4710(20)
SCREEN(R/G/B)
FOCUS(R/G/B)
[Figure 2. Exterior view of focus-pack]

8
Adjusting Method
4) When the focus control is finished, apply a silicon bond between inside and outside
diameter, paying attention so that the lens isn’t moved.
5) Project R, G, B signal only by one signal, using a lens cover and control G, R and B in the
order.
Note) This control should be performed in a darkroom. Especially, be careful not to touch the
lens with a hand.
Step 3. Focus control
1) Receive RETMA pattern.
2) Rotate the focus-pack of focus VR right and left to fix the optimum focus.
Note 1) Control the focus on the basis of 6cm by 6cm (intra-office signal 8CH, No.3) at the
left bottom of the screen.
Note 2) Perform the focus readjustment or correction if the entire screen isn’t focused even
after the completion of focus control.
3) Project R, G, B signal only by one color, using a lens cover and control G, R and B in the
order.
Step 4. Control of G-CRT 2-pole, 4-pole magnet
1) Receive DOT pattern.
2) Have only a green screen appear, using a lens cover.
3) Adjust the core to be located in the center of DOT, using a 4-pole magnet.
4) Adjust the DOT to be circular, using a 2-pole magnet.
5) Tighten the fixing part so that the magnet can’t move after finishing the adjustment.
Note 1) This control should be performed in a darkroom.
Note 2) Perform the focus readjustment or correction if the entire screen isn’t focused even
after the completion of focus control.
Applied chassis and model:SJ-113/DSJ-4710(20)

9
Adjusting Method
Step 5. Control of deflection yoke and tilt
1) Receive CROSS-HATCH pattern.
2) Rotating a loose DY left and right, control it so that the horizon of R, G, and B can be
projected on to the screen correctly in the form of horizon. (Refer to the center point of
Front -Mask)
3)After adjusting the R, G, B, FY, fix the DY with a lever not to turn.
Step 6. Control of raster position
1) Receive CROSS-HATCH pattern.
2) Adjusting the centering magnet attached to the DY, locate the center of green image at the
center of the screen (Refer to Figure 1).
3) Adjusting the centering magnet of R and B, locate R left and B right on the basis of G in the
center.
4) Fit the horizon in the center of R and B to the horizon of G.
5) In the center of screen, locate the vertical line of R approx. 20 to 30mm to the left on the
basis of G and the vertical line of G approx.20 to 30mm to the right (Refer to Figure 4).
Step 7. Control of convergence
Select “favorite”in picture mode
a. Control of 480i convergence
1) Input the signal of auto alignment system in a component terminal.
(Select one between component 1 and 2.)
Applied chassis and model:SJ-111, 112/DSJ-5510(20),DSJ-4710(20)
2) Connect I2C line of the auto alignment system with housing (P502A) at the top of a convergence board.
3) Select CONV.EXE in the auto alignment system program and press ENTER.
4) Push the main power to Off the Set and then On(After the control is finished).
5) Press the S11 key to read the convergence data.
6) Off the set and then On.
b. Control of 1080i convergence
Figure 4. Control of R, G, B raster

10
Adjusting Method
Step 8. Control of white balance
1) Connect a control pattern (intra-office signal cable broadcasting 32 CH) with external input 3.
2) Select the screen mode as standard.
3) Locate the sensor of 3298 system at the center of High/Low Beam.
4) Execute the projection program of control PC.
5) When OSD of ‘OK’appears on the monitor of control PC, the control is completed.
Measuring unit: Multimedia Display Tester 3298(YOKOGAYA)
Measuring signal: White -Balance Control Pattern (Intra-office signal cable broadcasting
32CH)
Coordinates setup:x=0.288 0.005 / y=0.301 0.005
Initial data (S8)
R DRV : 32 (RED DRIVE)
G DRV : 32 (GREEN DRIVE)
B DRV : 32 (BLUE DRIVE)
SUB BRIGHTNESS :32
SUB CONTRAST : 0
R CUT : 32 (RED BIAS)
G CUT : 32 (GREEN BIAS)
B CUT : 32 (BLUE BIAS)
Applied chassis and model:SJ-113/DSJ-4710(20)

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Adjusting Method
Step 9.
Control of sub brightness
- Press the S9 key to enter the Sub Brightness control mode.
- Screen mode: Standard
1) Receive RETMA pattern (intra-office signal cable broadcasting 96 CH)
2) Press the S8 key.
3) Control the Sub Brightness so that 18% gradation can be identified in the contrast chart of
gradation pattern.
Applied chassis and model:SJ-113/DSJ-4710(20)

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5. IC Description
5.1. Pin Connections and Short Descriptions for VSPB
For VSP 941x/4x, the pin connections differ for pins: 1, 2, 3, 75, 76, 77, 78, 79, 80 (see Section 5.1.2. on page 210).
5.1.1. Common Pin Connections and Short Descriptions (VSP94X5B, VSP94X7B)

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IC Description

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IC Description

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IC Description

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IC Description

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IC Description
5.1.2. Differing Pin Connections and Short Descriptions for VSP 941xB and VSP 944xB

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IC Description
5.2. Pin Circuits(VSP94X5B, VSP94X7B)

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IC Description
5.3. Application Circuit
5.3.1. Application Example for QFP80 package