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J54A Chassis Training Manual
Contents
1. Basic Principles of PJTV
2. J54A Model Specifications
3. J52A vs J54A
4. Block Diagram
5. PJTV Exploded View
6. Adjustments
7. Troubleshooting
8. New Model in 2004
1. Basic Principles of PJTV
A rear-type CRT projection TV magnifies and projects the
image formed by R, G, B monochroma CRTs onto a large
screen, finally displays the image on the screen.
Different from a front-type projector, it has a mirror between
lens and screen that is suitable for the home theater
MIRROR
because it is slim type.
Optical Block
- R, G, B monochroma CRTs SCREEN
- Lens and mirror that magnify and project the
image from the CRT onto a large screen.
- Screen that forms the ultimate image that is
SUN SCREEN
projected through the lens.
LENS
Mechanical Block
- Cabinets, doors, etc. that consist of the exterior
of a projection TV. CRT
(R/G/B)
MECHANISM
Circuit Block
CRT PWB
- Circuit composed to form the image on CRT
- Signal processing unit of input video and sound
CIRCUIT
- Power supply unit that drives circuit to operate.
Optical Part
An optical block is classified into three major parts, CRT, LENS and SCREEN
CRT Part
It consists of 7 monochromatic CRT (Red, Green and Blue) and its peripheral factors
in similar to a common visual straight CRT, an electron gun emits electrons collided onto a
fluoressent front of CRT generating an image.
It requires a cooling system against over heating resulted from establishing a high degree
of brightness at an infinitesimal area.
LENS Part
It consists of many layers of Lens and Mirrors in order to magnify/project an image of CRT
and enhanced color purity Lens with respect to Red, Green and Blue CRT respectively.
- One main lens : It magnifies a CRT image to a certain scale and determines a final image
scale on a screen.
- Three calibrating lenses : It corrects a degree of chromatic purity/aberration.
It determines a main spec. of appliance, such as composition scale, projection distance, image size.
SCREEN Part
It makes a final and optimum quality of image by reflecting or refracting a CRT image.
It consists of Fresnel, Lenticular and Contrast screen.
- Fresnel : It converges projected lights
- Lenticular : It diffuses out a light to each viewer's location
- Contrast screen : It improves a status of contrast.
Optical System
MTF(Mean Transfer Function) : Principal parameter that indicates the performance of projection lens.
F/number(Focal Length / Pupil Diameter) : Defines the brightness of Optical System.
TCL(Total Conjugate Length) : Defines the depth of Optical System.
Transmittance : The lens has Anti-reflection coating to reduce the loss of light.
TCL
Amplitude
BLUE CRT
axis of CRT
GREEN CRT
RED CRT Individual spots
optical axis
Optical System Amplitude
Red Green Blue
Amax Amin
SCREEN (CRT IMAGE) Individual spots
Amax-Amin
MTF = --------
Amax+Amin
CRT Structure
CRT Structure
: CRT consists of four major parts as follows;
- Bulb : It surrounds a CRT to maintain a vacuum state inside the CRT.
- Electron Gun : It emits electrons toward a fluorescent screen of CRT.
- Focusing section : It includes Deflection-Yoke controlling electron beam directions.
- Screen section : It includes fluorescent screen luminescent for electron beam making an image.
Aspherical
lens
Phosphor Power-lens
Deflection Yoke glass
Focus electrode
Aspherical
Grid 2 Grid 1 Aspherical lens
concave lens
Cooling liquid
Exit aperture Cathode
Aspherical or
Spherical
Faceplate CRT
Fluorescent
screen
CRT Side View 7" MONO CRT
Cooling System
Cooling System
- A magnification/projection type of CRT requires a higher input voltage as compared to that
of a visual straight CRT. Thus a coolant should be equipped
in the front of CRT. It keeps a surface temperature of CRT
R,G,B ECP LENS
at a constant degree. On the other hand, it prevents
COOLANT
over-aberrations by a variable refractive index to increasing
temperatures, degradation of a fluorescence and breakdown
of valve due to a luminescence, etc.
- A surface temperature of CRT: 100 for the center, 80 for
the surroundings a coolant keeps down the temperature at 50 ~ 60.
Comparison between coolant compositions
SUBJECT Ethylene Glycol Glycerin
Role Preventing a drvness Coolam
Molecular formula CH2OHCH2OH HOCH2CHOH
Boiling pt. 198 290
Freezing pt. -12 20
Flash pt. 116 177
Firing pt. 400 200
Colorless, odorless, sweet and Colorless, odorless, sweet and hygroscopic
Property
hygroscopic liquid liquid Syrup type of light yellow liquid
Storage Keep under a dry and cool contition
Others May cause a irritation if contacted or harm your eyesight if inhaled
Lens Structure
Lens Structure
: It consists of three parts
- ECP Lens(Enhanced Color Purity Lens) :
Each CRT of Red, Green and Blue emits a monochromatic light where there is a radiant light in
an inapplicable bandpass.
ECP lens of Red, Green clear blocks out the radiant light and improve a degree of color purity.
- Spherical Glass Lens :
It determines a magnifying power of optical instrument.
- Aspherical Plastic Lens :
It calibrates a monochromatic aberration(Spherical, Comma, Aberration, Front-face curvature and
Front-face distortion) resulted from a Glass Lens.
GLASS LENS R,G,B ECP LENS
PLASTIC LENS COOLANT
CRT-Lens Coupling
Mirror Part
The mirror changes the optical path of light projected
through the projection lens, in order to slim the volumn
of the set.
Reflection surface
Classification of Mirror
Front surface Mirror
- Reflection surface is placed in front of the glass plate.
- There is no multiple reflection of light.
- High price.
Second surface Mirror
- Reflection surface is placed behind the glass plate.
- There is multiple reflection of light.(Approx. 8~9%)
- Low price.
Front surface Second surface
Mirror Mirror
Screen Part
Screen Structure
: It consists of two parts (Fresnel + Lenticular)
- Fresnel : It sets a focal point of light emitted by CRT
- Lenticular : It adjusts a light through Fresnel to be suitable for viewers
- Pitch : There are bulged stripes on a Screen. A pitch refers to the stripe interval composed of a
observer side and the rest covered in black to block out a light.
In other words, the section transmits out a visible light.
- Black Stripe : The rest of part abovementioned blocks out other light(Fluorescent light, Sunlight),
instead of one from CRT.
- Dispersing Agent(TINT: Black dots in the picture) :
Since a light travels in a straight line, an image is to be visible on a screen from only one
direction the front without dispersing agent.
However, a dispersing agent enables it to be visible from all directions. (Up, Down, Left and Right)
- Gain : It explains an image brightness observed from the front direction numerically.
- Horizontal/Vertical vision angle : It explains an image brightness observed from all directions
(Left/Right or Up/Down) numerical respectively by angle.
- Sun Screen : Flat Panel is installed at the front of screen. It protects the screen, improve contrast
and prevents static electricity.
Its texture is as good as that of a common CRT employed if needed.
[Material : A hard coating processed PMMA (Tender one of acrylics) at 4H~6H.]
Screen Construction
Screen Assembly and Operation Theory
Image light
Black stripe part
Observer side 0.52mm
Diffusion layer
LENTICULAR
Image light
FRESNEL
2. J54A Model Specifications
MODEL SP43T6HP SP43T7HF REMARKS
PAL,SECAM-B/G,D/K,I
System CS : PAL Multi CS : PAL Multi
NT4.43, NT3.58
Display Device 7" CRT * 3 7" CRT * 3 R/G/B
Sun Screen Anti-Glare Anti-Glare Option
Color Normal/Cool1/Cool2/
5 Mode 5 Mode
Temperature Warm1/Warm2
Dolby Sound Virtual Prologic -
S:Surround
Audio Output 15W * 2 15W*2 + S + C
C:Center
2 Tuner PiP O O -
Double Window X O Multi PiP
Teletext O O
Normal/DVD/ZOOM/CINEMA
Aspect Ratio 4 Mode 4 Mode
(Wide: 6 Mode)
Standard/Movie/
Picture Mode 4 Mode 4 Mode
Custom/Dynamic
Custom/Standard/Music/
Sound Mode 5 Mode 5 Mode
Movie/Speech
Melody On/Off O O -
Still Picture O O -
S-Video Input Front-1 / Rear-1 Front-1 / Rear-1 -
AV Input Front-1 / Rear-3 Front-1 / Rear-3 -
Monitor Output Rear-1 Rear-1 RCA Jack
TV Output Rear-1 Rear-1 Scart Jack
DVD Input Rear-1 Rear-1 -
3. J52A Shark vs J54A Commando
Shark
SOUND-AMP
Shark Commando
Space 3,584 2,638
MICOM
C 6656 Wire 3,780 3,050
PRO-SCAN G DRIVE Parts 3,376 EA 2,553 EA
CAPTION
CG-MDL
SOUND-MDL
- 245*330 ( FR-1) 245*245 (FR-4)
3D-COM
A
B
Remark 245*330 (CEM-1) 245*330 (CEM-1)
M
DRIVE Stand-By:2 100*330 (CEM-1)
TERMINAL P
245 X 330 (FR1) 245 X 330 (CEM1) 110 X 330 (CEM1)
Commando
SOUND-AMP
PRO-SCAN+3D-COMB
Space
MICOM+CAPTION
Stand-By:2 : 36 % Slim
CG-MDL
Wire
SOUND
DRIVE : 24 % Short
6456
Parts : 32 % Simple
DRIVE
245 X 245 (FR4) 245 X 330 (CEM1)
4. Block Diagram
2-1. Wiring Diagram
DY-B CG-B DY-G CG-G DY-R CG-R
SCREEN SCREEN SCREEN SCREEN
S GND 210V
GND GND
CY-R/G/B
KEY2
I 210V
SENSE
SENCE
GND
HEATER
210V
N.C 210V
KEY2
GND D GND
HEATER
GND
12V
GND
HEATER
N.C
GND
C GND
GND
E
GND
12V
R
GND CRT GND
12V
HEATER
GND CRT D/F GND H1 4P X 3
GND
CRT B IK
G R 12V
R circuit H2
O 1 :S2-C B
GND
IK
SPOT
R
GND
IK
R
GND
IK
Dynamic V1
N KEY-2 2 :GND
A
SPOT GND
G
SPOT
SPOT Focus V2
3 :S2-ID
KEY-1 GND
T STD-5V
4 :S2-Y
5 :GND / B VM-
GND FOCUS
9:BV
12V
GND
ER
HEAT
GND
N.C
208V
GND 8:GND
GND 6 :AV3-R GND
R KEY-3 7 :GND
V GND
IK VM-OUT
PACK
7:BH
CONV-AMP
8 :GND SPOT.K 6:GV
IR 9 :AV3-L D/F
R Focus 5:GND
O TIMER-LED
NC
10:AV3-ID
11:GND VM-
4:GH
3:RV
2:GND
VM-
L SDA1
SCL1
12:AV4-CVBS VM- VM- VM-
VM-OUT G Focus 1:RH
GND VM-OUT VM-OUT VM-OUT VM-OUT
3P X 3 B Focus
VM DY-B
DY JACK
R/G/B
117V
NC
GND
13.5V
CONNECTION
GND
SPEAKER VM-Y
DY-G
DY-R 4P X 1 H1
H2
V1
V2
CN601 CN902 CNY01
12V
GND
R
HEATE
GND
N.C
208V
CNW802 CN802 CN401
L-OUT KEY-2 1 :S2-C
CN201
KEY-1 2 :GND 14:POWER
GND 3 :S2-ID
14:POWER
13:STD-BY5V 13:STD-BY5V
STD-5V
R-OUR 4 :S2-Y 1:117V 12:GND 12:GND
GND
GND 5 :GND 2:NC 11:HD 11:HD TO CG-AMP
GND-RGB(3P)
KEY-3 6 :AV3-R 3:GND 10 :GND 10 :GND
7 :GND 4:13.5V 9 :PROTECT
IR 5:GND
9 :PROTECT
8 :GND 8 :EW 8 :EW
TIMER-LED 9 :AV3-L 6:VM-Y 7 :VD- 7 :VD-
NC 10:AV3-ID 6 :VD+ 6 :VD+
SDA1 11:GND 5 :ABL 5 :ABL
SCL1 12:AV4-CVB
S CN03 4 :1080i
3:V-BLK
4 :1080i
3:V-BLK CN803
GND 2 :GND 2 :GND
1:R 1 :H-BLK 1 :H-BLK
2:GND 4:-24V
3:G 3:GND
4:GND
5:B CNW801 CN801 2:GND
1:24V
6:GND
7:IK 14:29V 14:29V
TDA7625
13:29V 13:29V
M
12:29V-GND 12:29V-GND
11:29V-GND 11:29V-GND
10:-24V 10:-24V
9 :GND 9 :GND
Defelction
I P
8 :8.5V
7 :8.5V
6 :GND
8 :8.5V
7 :8.5V
6 :GND
C R
5 :13.5V
4 :SUB-MUTE
5 :13.5V
4 :SUB-MUTE
C
3 :GND 3 :GND
O
2 :NC 2 :NC
O
1 :117V 1 :117V
TRANS
M M M G
-
-
-
-
CNZ02
T T S M 9:BV
FBT
8:GND
U U C D
7:BH
6:GV
5:GND
N N A L
4:GH
3:RV
2:GND
E E N CN04
1:RH
DY-R/G/B(4P)
1 :GND
R R 2 :5V
3 :UP
4 :GND
5 :5V
6 :RIGHT
7 :GND
POWER
8 :5V TO CG-AMP
9 :LEFT
10:GND
11:5V
12:DOWN
2 TO
R SCREEN
F CRT-R
-
S
POWER-SW AC-INPUT
MAIN SUB
2-2. Assy-Chassis
Main-Assy MICOM Scan Cg Sub-Assy
2-3. SuB-Module MICOM-Module
Scan-Module
3D-Comb Part
Cg-Module
2-4. IR Block Diagram
Cg-Module
Control-Assy
5V
CNZ01
Q02 1182 IC061
14
RMY01 Cg MICOM
14
SAM-452D
CN902
3 2 1
6
MICOM-Module
CN901
R921 1K IC901
34
ST/BY 5V 7 MICOM
SDA5550M
RMC Output Signal
2-5. Key-Scan Diagram
CN902
3.3V
2.7K
Key3 7
Power Menu CH UP CH DN Vol UP Vol DN Mute
2.7K
Key1 10
2.7K RY02 510 RY03 510 RY04 1K
Key2 11
[Key-Scan Voltage]
key Power Menu CH Up CH Down Vol Up Vol Down Mute TV/Video
K1 - O V 0.53V 0.91V 1.41V -
K2 - - - - - 0 V 0.52V 1.0V
K3 0 V - - - - - - -
[Key-Scan Voltage divide] 3.3V
Example) Volume-Up Key-in
2.7K A
510 510 1K RB * 3.3V 2.02K *3.3
=1.41V
Key1 RA + RB 2.7K+2.02K
B
2-6. OSD Block Diagram
MICOM MODULE
CN901
#57 (OSD-R/TTX-R) #58
#58 (OSD-G/TTX-G) #60
IC901
#59 (OSD-B/TTX-B) #62
SDA5550M
#60 (OSD-FB/TTX-FB) #64 To
SCAN-MDL
SCAN MODULE
CN02 CN03
#12 (OSD-R) #6 #64 (R-OUT) #1
IC04
#11 (OSD-G) #5 #63 (G-OUT) #3
#10 (OSD-B) #4 CXA2165Q #62 (B-OUT) #5
To
#9 (OSD-FB) #2 PCB-CRT
2-7. SOUND SWITCHING Block Diagram
VIDEO4 - R
VIDEO2 - R
VIDEO3 - R
EXT-R OUT
VIDEO1 - R
To IC602
TV - R
EXT-L OUT
SCL1
NC NC
SDA1
28 27 26 25 24 23 22 21 20 19 18 17 16 15
IC605
Audio Switching IC
TEA6422D
(98h)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
GND NC NC
VCC
TV - L
VIDEO1 - L TV - R OUT
To Scart-Jack
VIDEO3 - L
TV - L OUT
VIDEO2 - L
VIDEO4 - L
IC602 IC601
MSP3411/MSP3252 TDA7265
SUB-TUNER 69 SUB-SIF 24
#2(R) MAIN-R
MAIN-TUNER 67 MAIN-SIF 25
SCL1 2 SOUND
#5(R) #7(R) #11(R)
MAIN-R-OUT 27
SDA1 3 IC603 AMP
MAIN-L
S-RESET 21 MAIN-L-OUT 28 TL062CDT
#1(R) #7(R) #4(L)
#3(L)
57 SC1-R-IN
#7(C) #11(C) #2(C)
56 SC1-L-IN #5(C) CENTER
CENTER-OUT 29
IC603
DVD-R 54 SC2-R-IN SURROUND-OUT 31 TL062CDT SOUND
#3(S) #1(S) #7(S)
DVD-L 53 SC2-L-IN AMP
S - L
#4(S)
EXT-R 51 SC3-R-IN
SC2-R-OUT 33 Monitor-R-Out
EXT-L 50 SC3-L-IN Monitor-L-Out
SC2-L-OUT 34
S - R
48 SC4-R-IN SC1-R-OUT 36 TV-R-Out
47 SC4-L-IN SC1-L-OUT 37 TV-L-Out
IC Spec Chassis Function Remark
MSP3452G-A2 P54A Dolby+Stereo Old Version
P54A, New Version
MSP3452G-B3 Dolby+Stereo
P55A, J54A *P55A/J54A
MSP3450G P54A Without Dolby
MSP3411G J54A Virtual *J54A
2-8. JACK IDENT Block Diagram
IC704 PCF8591P
NC R738: 9.1
#1(Ain0) (SCL)10 SCL
DVD-ID R739: 9.1
AV2-ID R740: 9.1 (SDA) 9 SDA
#2(Ain1)
S2-ID R741: 20
AV3-ID R742: 9.1
#3(Ain2)
NC R743: 20
AV4-ID R744: 20
#4(Ain3)
S1-ID R745: 9.1
IC705 PCF8591P
AV1-ID R738: 9.1 (SCL)10 SCL
Scart #1(Ain0)
(SDA) 9 SDA
. JACK IDENT OPTION
. PCF8591P INPUT STEP
STEP
Input Voltage 0 ~ 1.96 1.97 ~ 2.45 2.46 ~ 3.43 3.44 ~ 4.9
. PCF8591P (IC704) INPUT (RCA JACK OPTION)
Operation Voltage
PIN NO Function LOC. Spec
Separate Conector With Jack (All) With Out Jack
#1 NC R738 9.1 -
4.10V () 2.13V ()
Ain 0 DVD R739 9.1 4.07V ()
#2 AV2 R740 9.1 2.15V ()
4.09V () 1.76V ()
Ain 1 SVHS-2 R741 20 2.88V ()
#3 AV3 R742 9.1 4.07V ()
4.09V () 2.13V ()
Ain 2 NC R743 20 -
#4 AV4 R744 20 4.07V ()
2.13V () 2.89V ()
Ain 3 SVHS-1 R745 9.1 1.76V ()
2-9. Video Signal Diagram Input
INPUT MAIN Block OUTPUT (PRO-SCAN)
INPUT SCAN Block OUTPUT
19 TTX-CVBS
MAIN-CVBS 1 RF2 CVBS 2 Y
54
18 To Micom
3 IC702 MAIN Y/CVBS VSP9407 79 Cb
SUB-CVBS 55
17 Scanrate
Video S/W MAIN C 76 Cr
S2-Y 5 16 56 Converter
TEA6425 H
PIP Y/CVBS 17
6 15 57
S2-C
PIP C 23 V
14 58
S1-C 8
13 DVD Y/Pb/Pr
#46(R),#47(G),#48(B)
S1-Y 10 AV1 R/G/B
12 #39(R),#40(G),#41(B)
MONITOR OUT
2 4 7 To RCA-Jack
SDA1
SCL1 To CRT
2 4 7 Y 20
19 MAIN CVBS Cb 21
RF1-CVBS 1 R
18 SUB CVBS Cr 22 CRT Driver
AV3-CVBS 3 IC701 G
17 CXA2165
H 28
AV2-CVBS 5 Video S/W (86h)
16 TV OUT V 42 B
TEA6425
To Scart-Jack
AV4-CVBS 6 15
14
DVD-Y 8
13
AV1-CVBS 10 AV1 R/G/B
12 DVD Y/Pb/Pr CG Sync/R/G/B
OSD R/G/B/YS/YM
2-10. CONVERGENCE Module Block Diagram
D/W-MDL CXA2165
R G B SCL SCL
IC12 SDA SDA
Up/Left IC13
Amp/LPF
Sensor Sensor In
MUX V_BLK
Down/Right
Amp/LPF Select
H_BLK
IC17
MUX_Select 0 IC07
FPLL
PLL
MUX_Select 1 R/G/B-V OUT IC01