Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo Proj TV SJ-112 chassis SJ112
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S/M No. :DSJ112FEFO
Service Manual
REAR PROJECTION TV
CHASSIS : SJ-112
MODEL : DSJ-4710CRA/5510CRA
DSJ-4720CRA/5520CRA
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
Service Information Center(http://svc.dwe.co.kr)
DAEWOO ELECTRONICS Corp.
http : //svc.dwe.co.kr Feb. 2004
Contents
1. Safety Instruction 3
2. Product Specification 4
3. Remote Control 5
4. Adjusting Method 6
5. Explanation for circuit operation 12
6. Trouble Shooting 34
7. Service Part list 43
8. Schematic Diagram
1) Block Diagram 76
2) Power 77
3) Rear IO 78
4) AV main 79
5) deflection 80
6) Convergence Amp & Sound Amp 81
7) Convergence Module 82
8) CRT Amp 83
9) Control & side 84
9. PRINTED CIRCUIT BOARD
1) Main PCB 85
2) Power PCB 86
3) AMP PCB 87
4) CRT PCB 88
5) DEF PCB 89
6) UNION-1 PCB(CONTROL, SIDE) 90
7) UNION-2 PCB(CONV MODULE, REAR IO 91
10. EXPLODED VIEW
1) DSJ-4710 92
2) DSJ-4720 93
3) DSJ-5510 94
4) DSJ-5520 95
1
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
2
8. How to check a leakage current
1) Plug the power directly.
2) After connecting 1.5V 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.
3
2. Specifications
Input voltage AC 220V, 60Hz
Power consumption 230watts
Dimensions (W x H x D) 1278 x 1351.7 x 586mm (5510)
1278 x 1351.7 x 591mm (5520)
General 1110 x 1210 x 532.5mm (4710)
1110 x 1210 x 529.5mm (4720)
Weight 77.9Kg(55"), 66.5Kg(47")
Antenna input One 75 ohm external input terminal
for UHF/VHF/Cable
Screen size 139cm(55"),119cm(47"), 16:9 Aspect Ratio
Scanning type DTV : 1080I @ 33.75KHz
Image NTSC/DVD: 480p @ 31.5KHz
1080I @ 33.75KHz
CRT size 7"
Sound system 3D Stereophonic sound
NTSC voice Stereo, Sound multiplex
Voice
Voice output 15W/ch (Main L/R)
Rear
Antenna input 2EA
NTSC AV input 2pairs (S-Video/Video/L/R)
External NTSC AV monitor output 1pair(Video/L/R)
Input/ Component input 2pair(Y/Pb/Pr)
Output Right
NTSC AV input 1pairs(S-Video/Video/L/R)
4
3. Specifications of remote control
DISPLAY Power
TV/VCR/CATV
Channel number (0-9)
Use to select channel directly 0~9
100 Prev
Use it when selecting a channel It returns to previous channel.
number of over 100
MENU
Use it to make picture adjustment,
screen format, sound adjustment,
TV/Component
input selection, and utilities. TV -> Component 1 -> Component 2 -> TV
TV/VIDEO
Use this function to make
video input selection. CH
It changes in the following sequence
TV -> VIDEO1 -> 2 -> 3 -> TV
VOLUME
Mute
Dolby Virtual
CHANNEL ADD/ERASE Sound Mode
This feature either memorizes the This feature allows you to choose the mode ,
current channel or erases a channel Each time the button is pressed, it rotates from
that has previously memorized. Normal -> Music -> Movie -> News -> User.
Sleep Timer Bilingual Broadcasting
This feature is used to set up the time This feature allows you to select the
of automatic turn off. language while broadcasting.
Screen Size VCR Function
This feature converts the screen size by REW, PLAY, FF, STOP, REC, PAUSE
changing its aspect ratio. Each time you Caption
press the button, it will be changed from This feature allows you to choose the
16:9 -> 4:3 -> Panorama -> ZOOM1 caption.
->ZOOM2 Each time the button is pressed it rotates
from CC1 -> CC2 -> CC3 -> CC4 -> Off
Auto Picture ANT
Standard -> Cinema -> Dynamic -> User
PIP
PIP
Search
TV/Video STILL
Position SWAP
5
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.
DY rectangle GENTERING VM COIL
projection MAGNET
(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-111, 112/DSJ-5510(20),DSJ-4710(20)
6
Adjusting Method
Completion of control
- All adjustments need to be performed after heat-run for 30 min 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) Select `Video 1' without a signal.
2) After turning the screen VR of focus pack right, slowly rotate it left when a retrace 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.
SCREEN(R/G/B)
FOCUS(R/G/B)
[Figure 2. Exterior view of focus-pack]
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-111, 112/DSJ-5510(20),DSJ-4710(20)
7
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-111, 112/DSJ-5510(20),DSJ-4710(20)
8
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).
Figure 4. Control of R, G, B raster
Step 7. Control of convergence
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)
9
Adjusting Method
2) Connect I2C line of the auto alignment system with housing (P503) at the top of a
convergence board.
3) Select CONV.EXE in the auto alignment system program and press ENTER.
4) Control the user convergence with a remote control after the control is finished.
b. Control of 1080i convergence
1) Repeat the above 1) to 4) for 1080i mode.
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=0.275 0.005 / y=0.275 0.005
Initial data (S8)
R DRV : 31 (RED DRIVE)
G DRV : 40 (GREEN DRIVE)
B DRV : 31 (BLUE DRIVE)
R CUT : 61 (RED BIAS)
G CUT : 64 (GREEN BIAS)
B CUT : 61 (BLUE BIAS)
Applied chassis and model:SJ-111, 112/DSJ-5510(20),DSJ-4710(20)
10
Adjusting Method
Step 9.
Control of 480p color accord
1) Receive Cross-Hatch 480p signal by using HD signal output instrument.
2) Press the S7 key of service remote control to enter the 480p color accord control mode.
3) Change RHLIN to control RED color accord.
4) Change BHLIN to control BLUE color accord.
Measuring unit:VG-858(ASTRO)
Initial data (S7)
RH LIN : -53
BH LIN : +127
Step 10.
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 S9 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-111, 112/DSJ-5510(20),DSJ-4710(20)
11
5. Explanation for circuit operation
< Contents >
1. Specifications and Features
1-1 Specifications of product
1-2 Features of product
2. Power
2-1 Outline
2-2 Block diagram
2-3 Composition of power supply
2-4 Explanation for power supply operation
3. Deflection
3-1 Outline
3-2 Block diagram
3-3 Composition of deflection part
3-4 Explanation for operation
4. Video signal processing
4-1 Block diagram
4-2 Video processor
5. Sound
5-1 Switching part
5-2 Sound processing
6. Convergence
6-1 Outline
6-2 Block diagram
6-3 Composition
7. CRT AMP
12
Explanation for circuit operation
1. Specification/Feature
1-1. Specification of prodict
Input voltage AC 220V, 60Hz
Power consumption 230watts
Dimensions (W x H x D) 1278 x 1351.7 x 586mm (5510)
1278 x 1351.7 x 591mm (5520)
1110 x 1210 x 532.5mm (4710)
General 1110 x 1210 x 529.5mm (4720)
Weight 77.9Kg(55"), 66.5Kg(47")
Antenna input One 75 ohm external input terminal
for UHF/VHF/Cable
Screen size 139cm(55"),119cm(47"), 16:9 Aspect Ratio
Scanning type DTV : 1080I @ 33.75KHz
NTSC/DVD: 480p @ 31.5KHz
Image
1080I @ 33.75KHz
CRT size 7"
Sound system 3D Stereophonic sound
NTSC voice Stereo, Sound multiplex
Voice
Voice output 15W/ch (Main L/R)
Rear
Antenna input 2EA
NTSC AV input 2pairs (S-Video/Video/L/R)
External
NTSC AV monitor output 1pair(Video/L/R)
Input/
Component input 2pair(Y/Pb/Pr)
Output
Right
NTSC AV input 1pairs(S-Video/Video/L/R)
1-2. Features of product
7" Pure Flat Picture Tube
Digital 3D Comb Filter
Video Noise Reduction
1080i(HD), Line doubled to 480p(NTSC)
Velocity Modulation Scanning
Dynamic Focus System
Auto channel Programming
Black Level Expender
13
Explanation for circuit operation
2. Power
2-1. Outline
This power is a power supply of 230W to provide a power for 55"/47"CRT Projection TV.
2-2. Block diagram
The block diagram of this power is as follows.
2-3 Composition of power supply
This power supply is formed in Fly-back type to provide various powers.
The design specification of this power supply is as follows.
1) Input power: 120Vac (+/- 10%), 60Hz
2) Power consumption : 230W
3) The second power supply is shown in table 1-1. (Final power supply)
14
Explanation for circuit operation
No. Position Kind Purpose Current Remark