Orion DTV2784 Service Manual
SERVICE MANUAL
DTV2784
S/M CODE NO. M3W4062ASM
DATE OF ISSUE 02/2006
COLOR TELEVISION RECEIVER
ORIGINAL
VERSION (A)
All the specifications and features are subject to change without notice.
IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its
back removed involves a shock hazard. Work on
these models should only be performed by those who
are thoroughly familiar with precautions necessary
when working on high voltage equipment.
Exercise care when servicing this chassis with power
applied. Many B plus and high voltage RF terminals are
exposed which, if carelessly contacted, can cause
serious shock or result in damage to the chassis.
Maintain interconnecting ground lead connections
between chassis, escutcheon, picture tube dag and
tuner cluster when operating the chassis.
These receivers have a "polarized" AC line cord. The AC
plug is designed to fit into standard AC outlets in one
direction only. The wide blade connects to the "ground
side" and the narrow blade connects to the "hot side" of
the AC line. This assures that the TV receiver is properly
grounded to the house wiring. If an extension cord must
be used, make sure it is of the "polarized" type.
Since the chassis of this receiver is connected to one
side of the AC supply during operation, service should
not be attempted by anyone not familiar with the
precautions necessary when working on these types
of equipment.
When it is necessary to make measurements or tests with
AC power applied to the receiver chassis, an Isolation
Transformer must be used as a safety precaution and to
prevent possible damage to transistors. The Isolation
Transformer should be connected between the TV line
cord plug and the AC power outlet.
When removing springs or spring mounted parts from the
tuner, tuner cluster or chassis, shatterproof goggles must
be worn. Keep others without shatterproof goggles away.
Before returning the receiver to the user, perform the
following safety checks:
1.
2.
3.
Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
Replace all protective devices such as nonmetallic
control knobs, insulating fishpapers, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
To be sure that no shock hazard exists, a check for
the presence of leakage current should be made at
each exposed metal part having a return path to the
chassis (antenna, cabinet metal, screw heads,
knobs and/or shafts, escutcheon, etc.) in the
following manner.
Plug the AC line cord directly into a 120V AC receptacle.
(Do not use an Isolation Transformer during these
checks.) All checks must be repeated with the AC line
cord plug connection reversed. (If necessary, a
nonpolarized adapter plug must be used only for the
purpose of completing these checks.)
If available, measure current using an accurate leakage
current tester. Any reading of 0.35mA or more is
excessive and indicates a potential shock hazard which
must be corrected before returning the receiver to the
owner.
If a reliable leakage current tester is not available, this
alternate method of measurement should be used.
Using two clip leads, connect a 1500 ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series with
a known earth ground, such as a water pipe or conduit
and the metal part to be checked. Use a VTVM or
VOM with 1000 ohms per volt, or higher, sensitivity to
measure this AC voltage drop across the resistor. Any
reading of 0.35 volt RMS or more is excessive and
indicates a potential shock hazard which must be
corrected before returning the receiver to the owner.
TO EXPOSED
METAL PARTS
TO KNOWN
EARTH GROUND
AC SCALE
VT VM
0.15K OHMS
10W
15µ F
TEST PROBE
A1-1
PCBs (manufactured) using lead free solder will have a PbF printing on the PCB.
(Please refer to figures.)
Caution:
Pb free solder has a higher melting point than standard solder;
Typically the melting point is 86°F~104°F(30°C~40°C) higher.
Please use a soldering iron with temperature control and adjust it to 650°F ± 20°F (350°C ± 10°C).
In case of using high temperature soldering iron, please be careful not to heat too long.
Pb free solder will tend to splash when heated too high (about 1100°F/ 600°C).
All products with the printed circuit board with PbF printing must be serviced with lead free solder.
When soldering or unsoldering, completely remove all of the solder from the pins or solder area,
and be sure to heat the soldering points with the lead free solder until it melts sufficiently.
Distinction of PbF PCB:
Recommendations
Recommended lead free solder composition is Sn-3.0Ag-0.5Cu.
ABOUT LEAD FREE SOLDER (PbF)
•
•
•
A1-2
A1-1
A1-2
A2-1
A3-1~A3-4
B1-1
B2-1, B2-2
C-1
C-1, C-2
C-3
D-1~D-6
E-1~E-5
F-1, F-2
G-1
H-1, H-2
H-3, H-4
I-1~I-4
I-5
J-1, J-2
J-3, J-4
J-5, J-6
J-7, J-8
J-9, J-10
J-11, J-12
J-13, J-14
J-15, J-16
J-17, J-18
J-19, J-20
J-21, J-22
J-23, J-24
J-25, J-26
K-1, K-2
L-1
M1-1
M1-1
M2-1~M2-7
TABLE OF CONTENTS
A2-1
IMPORTANT SERVICE SAFETY INFORMATION ...........................................................................................
ABOUT LEAD FREE SOLDER (PbF)...............................................................................................................
TABLE OF CONENTS ......................................................................................................................................
GENERAL SPECIFICATIONS ..........................................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP...................................................................................................................
2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ....................................................................
SERVICE MODE LIST.......................................................................................................................................
WHEN REPLACING EEPROM (MEMORY) IC .................................................................................................
RE-WRITE FOR DIGITAL SOFT FIRMWARE ...................................................................................................
ELECTRICAL ADJUSTMENTS .........................................................................................................................
TROUBLESHOOTING GUIDE ...........................................................................................................................
IC DESCRIPION ................................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS .....................................................................................................
BLOCK DIAGRAM
MICON/CHROMA ..........................................................................................................................................
SD DIGITAL MODULE ...................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT .....................................................................................................................................................
DIGITAL .........................................................................................................................................................
SCHEMATIC DIAGRAMS
MICON .........................................................................................................................................................
CHROMA/IF............................................................................................................................................... ......
DEFLECTION ................................................................................................................................................
POWER .........................................................................................................................................................
TUNER .........................................................................................................................................................
AV/SOUND ....................................................................................................................................................
CRT/SVM.......................................................................................................................................................
COMB/FILTER ...............................................................................................................................................
ASIC...............................................................................................................................................................
SDRAM .........................................................................................................................................................
FLASH .........................................................................................................................................................
FRONT END ..................................................................................................................................................
AV OUT .................................................................... . ..................................................................................
WAVEFORMS ....................................................................................................................................................
MECHANICAL EXPLODED VIEW .....................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST..................................................................................................
ACCESSORY REPLACEMENT PARTS LIST................................................................................................. ....
ELECTRICAL REPLACEMENT PARTS LIST ...................................................................................................
GENERAL SPECIFICATIONS
G-1 TV
CRT CRT Size / Visual Size 27 inch / 676.0mmV
SYSTEM
CRT Type Normal
Magnetic Field BV/BH +0.45G/0.18G
Color System NTSC
Speaker 2Speaker
Position Front
Size 2.0 x 3.5 Inch
Impedance 8 ohm
Sound Output MAX 1.0 + 1.0
W
10%(Typical) -
W
NTSC3.58+4.43 /PAL60Hz No
G-2 Tuning
Broadcasting System Analog US System M
System
Digital ATSC(8VSB), QAM
Tuner and System 1Tuner
Receive CH Destination USA(W/ CATV)
2 - 69, 4A, A-5 - A-1,
CH Coverage A - I, J - W, W+1 - W+84
Intermediate Digital 44.00MHz
Frequency Analog Picture(FP) 45.75MHz
Sound(FS) 41.25MHz
FP-FS 4.50MHz
Preset CH
No
Stereo/Dual TV Sound Yes
Tuner Sound Muting Yes
G-3 Power
Power Source AC 120V AC 60Hz
DC
Power Consumption at AC
27" 110 W at AC 120 V 60 Hz
Stand by (at AC) 3 W at AC 120 V 60 Hz
Per Year -- kWh/Year
Protector Power Fuse Yes
Safety Circuit Yes
IC Protector(Micro Fuse) No
G-4 Regulation
Safety UL
Radiation FCC
X-Radiation DHHS
G-5 Temperature
Operation
+5oC ~ +40oC
Storage
-20oC ~ +60oC
G-6 Operating Humidity
Less than 80% RH
G-7 On Screen
Menu Yes
Display
Menu Type Icon
Menu1 Picture Yes
Mode(Picture preference) No
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Color Temperature No
Reset Yes
Audio Yes
MTS Yes
Bass No
Treble No
Balance No
BBE No
Stable Sound No
Speakers On/Off No
Audio Language Yes
Digital Output (PCM/Dolby Digital) Yes
Surround No
Reset Yes
Setup Yes
Language Yes
Clock Set Yes
TV/CABLE Yes
Auto CH Memory Yes
Add/ Delete Yes
Closed Caption Yes
CC Advanced (Size, Type, Edge, Yes
Color, Background Color)
Signal Meter Yes
Option
Yes
On/Off Timer Yes
A3-1
GENERAL SPECIFICATIONS
Favorite CH No
CH Label Yes
Video Label No
Locks
Yes
Password Yes
V-Chip Yes
Video Lock Yes
CH Lock Yes
Game Timer No
Front. Panel Lock Yes
Control Level Yes
Volume Yes
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Bass No
Treble No
Balance No
Signal Meter Yes
Stereo, SAP, Mono Yes
Video Yes
Component Yes
Channel(TV/Cable) Yes
CH Label Yes
Video Label No
Clock Yes
Game Timer No
On/Off Timer Yes
Sleep Timer Yes
Reset Yes
Sound Mute Yes
Picture Size Yes
V-chip Rating Yes
G-8 OSD Language
English French Spanish
G-9 Clock and
Sleep Timer Max Time 120 Min
Timer
Step 10 Min
On/Off Timer Program(On Timer / Off Timer) Yes
Timer Back-up (at Power Off Mode) more than -- Min Sec
G-10 Remote
Unit RC-KL
Control
Glow in Dark Remocon No
Format NEC
Remocon Format Orion
Custom Code 86-05 h
Power Source Voltage(D.C) 3V
UM size x pcs UM-4 x 2 pcs
Total Keys 27 Keys
Keys Power Yes
1 Yes
2 Yes
3 Yes
4 Yes
5 Yes
6 Yes
7 Yes
8 Yes
9 Yes
0 Yes
100 No
CH Up Yes
CH Down Yes
Volume Up Yes
Volume Down Yes
TV/Caption/Text Yes
CH1/CH2 No
TV/Video(TV/AV) Yes
CH RTN/CH ENT(Quick View) Yes
Sleep Yes
Display(Call) / - Yes
Reset Yes
Menu Yes
Enter Yes
A3-2
GENERAL SPECIFICATIONS
Mute Yes
Exit Yes
MTS(Audio Select) Yes
Set + No
Set - No
Picture Size Yes
Multi Brand Keys CH Up(VCR) No
CH Down(VCR) No
Pause/Still No
TV/VCR(VCR) No
CH Enter No
Code Set (Code) No
FF No
Rew No
Rec No
Play No
Stop No
TV No
VCR No
Cable No
G-11 Features
Auto Degauss Yes
Auto Shut Off Yes
Canal+ No
Cable(CATV) Yes
Anti-theft No
Rental No
Memory(Last CH) Yes
Memory(Last Volume) Yes
V-Chip (Analog & Digital) Yes
Type USA, ORION Type
BBE No
Auto Search No
CH Allocation No
SAP Yes
Tone Control No
Just Clock Function No
Game Position No
CH Label Yes
VM Circuit No
Full OSD No
Premiere No
Comb Filter No
Lines
Auto CH Memory Yes
Hotel Lock No
Closed Caption (Analog & Digital) Yes
CC Advance Yes
Stable Sound No
Surround No
CH Lock Yes
Video Lock Yes
Game Timer (Max Time:120 Min) No
Energy Star No
Power On Memory Yes
Favorite CH No
FBT Leak Test Protect No
Mode(Picture Preference) No
Variable Audio Out No
Front Panel Lock Yes
QAM Yes
Digital Out Dolby Digital Yes
MPEG No
PCM Yes
DTS No
Zoom Yes
G-12 Accessories
Owner's Manual Language English / Spanish
w/Guarantee Card Yes
Remote Control Unit Yes
Rod Antenna No
Poles
Terminal
Loop Antenna
No
Terminal
U/V Mixer
No
A3-3
GENERAL SPECIFICATIONS
DC Car Cord (Center+)
No
Guarantee Card
No
Warning Sheet
No
Circuit Diagram
No
Antenna Change Plug
No
Service Facility List
No
Important Safeguard
No
Dew/AHC Caution Sheet
No
AC Plug Adapter
No
Quick Set-up Sheet
No
Battery
Yes
UM-4 x 2pcs
OEM Brand
No
AC Cord
No
AV Cord (2Pin-1Pin)
No
Registration Card
No
Information Sheet
No
PTB Sheet
No
300 ohm to 75 ohm Antenna Adapter
No
Information Sheet(Return) Yes
G-13 Interface
Switch Front Power Yes
System Select No
Main Power SW No
Sub Power No
Channel Up Yes
Channel Down Yes
Volume Up Yes
Volume Down Yes
Rear AC/DC No
TV/CATV Selector No
Degauss No
Main Power SW No
Indicator Power No
Stand-by No
On Timer No
Terminals Front Video Input = VIDEO2
RCA
Audio Input = VIDEO2
RCA x 2 (L/MONO,R)
Other Terminal No
Rear Video Input(Rear1) = VIDEO1
RCA
Video Input(Rear2) No
Audio Input(Rear1) = VIDEO1
RCA x 2 (L/MONO,R)
Audio Input(Rear2) No
Video Output No
Audio Output No
S-Input Yes
Component Input2(w/ Analog Audio L/R)
RCA x 5
Digital Audio Out
Coaxial x 1
Diversity No
Ext Speaker No
DC Jack 12V(Center +) No
VHF/UHF Antenna Input
F Type
AC Outlet No
G-14 Set Size
Approx. W x D x H (mm) 740 x 489.5 x 571.5
G-15 Weight
Net (Approx.) 35kg
( 77.2 lbs)
Gross (Approx.) 38Kg
(83.8 lbs)
G-16 Carton
Master Carton
No
Content ----
Sets
Material --
/--
Dimensions W x D x H(mm) -- x -- x --
Description of Origin
No
Gift Box Material Double/White W/Photo Label
Dimensions W x D x H(mm) 850 x 575 x 665
Description of Origin Yes
Drop Test
Natural Dropping At 1 Corner / 3 Edges / 6 Surfaces
Height (cm) 31
Container Stuffing 192
Sets/40' container
G-17 Material
Cabinet Cabinet Front PS 94V0 DECABROM
Cabinet Rear PS 94V0 DECABROM
PCB Non-Halogen Demand
No
Eyelet Demand
No
G-18 Environment
Environmental standard requirement (by buyer) Green procurement of ORION
Pb-free
Phase3(Phase3A)
A3-4
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of
a flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated screwdriver,
touch the support of the Anode with the tip of the
screwdriver.
A cracking noise will be heard as the voltage is discharged.
Flip up the sides of the Rubber Cap in the direction of the
arrow and remove one side of the support.
(Refer to Fig. 1-2.)
2.
GND on the CRT
Screwdriver
Alligator Clip
Support
CRT
GND on the CRT
Rubber Cap
CRT
Support
Fig. 1-2
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)
Location of Anode Cap
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.3.Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.
5.6.Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
CRT
Support
DISASSEMBLY INSTRUCTIONS
Fig. 1-3
Fig. 1-4
Fig. 1-5
*
*
Fig. 1-1
B1-1
Loading...