Durabrand DBTV1902 Schematic
DBTV1902
SERVICE MANUAL
COLOR TELEVISION RECEIVER
SUPPLEMENT
MFR'S VERSION B
This SUPPLEMENT must be used together SERVICE MANUAL for DBTV1901 Series B.
All other test and repair procedures are as shown in the ORIGINAL MANUAL.
Please file this SUPPLEMENT with the ORIGINAL VERSIONS.
Design and specifications are subject to change without notice.
01
00
DBTV1901 Series B
MECHANICAL REPLACEMENT PARTS LIST
DBTV1901 Series B
DBTV1902
WHEN REPLACING EEPROM (MEMORY) IC
SPEC.NO.
O/R NO.
M3L2-17C
REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION
101 A3L211C720 CABINET FRONT ASS'Y A3L217C720 CABINET FRONT ASS'Y
108 722552A019 SHEET,RATING 722552A022 SHEET,RATING
--- 7230007398 SECURITY TAG
--- 793WCDB237 GIFT BOX 793WCDB366 GIFT BOX
--- JB5K0200 POLYBAG,INSTRUCTION JB5U0200 POLYBAG,INSTRUCTION
--- J3L21101 INSTRUCTION BOOK J3L21701 INSTRUCTION BOOK
--- J3L10502 WARRANTY SHEET J5A34002 WARRANTY SHEET
--- A3L211C975 INSTRUCTION BOOK KIT A3L217C975 INSTRUCTION BOOK KIT
DBTV1902
REF. NO.
08
DATA DATA
W253015
SERVICING NOTICES ON CHECKING
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a mark, the designated
parts must be used.
4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is
secured against implosion. However, when
removing it or serving from backward, it is
dangerous to give a shock. Take enough care to
deal with it.
!
6. AVOID AN X-RAY1. KEEP THE NOTICES
Safety is secured against an X-ray by considering about the cathode-ray tube and the high
voltage peripheral circuit, etc.
Therefore, when repairing the high voltage peripheral circuit, use the designated parts and
make sure not modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathoderay tube.
PERFORM A SAFETY CHECK AFTER
7.
SERVICING
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
Unplug the plug from the AC outlet.
2.
Remove the antenna terminal on TV and turn
on the TV.
3.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1].
4.
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
HOW TO ORDER PARTS
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
IMPORTANT
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
A1-1
CONTENTS
SERVICING NOTICES ON CHECKING .........................................................................................................
HOW TO ORDER PARTS ...............................................................................................................................
IMPORTANT ....................................................................................................................................................
CONTENTS......................................................................................................................................................
GENERAL SPECIFICATIONS ........................................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP ..............................................................................................................
2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC...............................................................
SERVICE MODE LIST ....................................................................................................................................
CONFIRMATION OF HOURS USED .............................................................................................................
WHEN REPLACING EEPROM (MEMORY) IC .............................................................................................
ELECTRICAL ADJUSTMENTS......................................................................................................................
BLOCK DIAGRAM ..........................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT..............................................................................................................................................
SCHEMATIC DIAGRAMS
MICON/TUNER .....................................................................................................................................
CHROMA ...............................................................................................................................................
POWER ..................................................................................................................................................
DEFLECTION/CRT................................................................................................................................
SOUND/AV ............................................................................................................................................
WAVEFORMS .................................................................................................................................................
MECHANICAL EXPLODED VIEW .................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST .............................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ...............................................................................................
A1-1
A1-1
A1-1
A2-1
A3-1~A3-4
B1-1
B2-1, B2-2
C-1
C-1
C-1
D-1~D-5
E-1, E-2
F-1~F-4
G-1, G-2
G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
H-1, H-2
I-1
J1-1
J2-1, J2-2
A2-1
GENERAL SPECIFICATIONS
No
No
+5oC ~ +40oC
-20oC ~ +60oC
Brightness Yes
G-1 TV CRT CRT Size / Visual Size 19 inch / 480.0mmV
System CRT Type Normal
Deflection 90
Magnetic Field BV/BH +0.45G/0.18G
Color System NTSC
Speaker 1Speaker
Position Bottom
Size 3 Inch
Impedance 8 ohm
Sound Output MAX 1.5
10%(Typical) 1.0
NTSC3.58+4.43 /PAL60Hz No
G-2 Tuning Broadcasting System US System M
System Tuner and System 1Tuner
Receive CH Destination Ohers
Tuning System F-Synth
Input Impedance VHF/UHF 75 ohm
CH Coverage A - I, J - W, W+1 - W+84
Intermediate Picture(FP) 45.75MHz
Frequency Sound(FS) 41.25MHz
FP-FS 4.50MHz
Preset CH
Stereo/Dual TV Sound
Tuner Sound Muting Yes
G-3 Power Power Source AC 120V AC 60Hz
DC
Power Consumption at AC
73 W at AC 120 V 60 Hz
Stand by (at AC) 5 W at AC 120 V 60 Hz
Per Year -- kWh/Year
Protector Power Fuse Yes
G-4 Regulation Safety UL / CSA
Radiation FCC / IC
X-Radiation DHHS / HWC
G-5 Temperature Operation
Storage
G-6 Operating Humidity Less then 80% RH
G-7 On Screen Menu Yes
Display Menu Type Character
Picture Yes
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Audio No
Bass No
Treble No
Balance No
BBE On/Off No
Stable Sound On/Off No
CH Set Up Yes
TV/CATV Yes
Auto CH Memory Yes
Add/ Delete Yes
Language Yes
V-chip Yes
CH Label No
Favorite CH No
Color Stream DVD/DTV No
Control Level Yes
Volume Yes
degree
W
W
2 - 69, 4A, A-5 - A-1,
A3-1
GENERAL SPECIFICATIONS
Glow in Dark Remocon
Pause/Still No
Contrast Yes
Color Yes
Tint (NTSC Only) Yes
Sharpness Yes
Tuning No
Bass No
Treble No
Balance No
Back Light No
Stereo,Audio Output,SAP No
Video Yes
Color Stream No
Channel(TV/Cable) Yes
CH Label No
Sleep Timer Yes
Sound Mute Yes
V-chip Rating Yes
G-8 OSD Language English French Spanish
OSD Language Setting English
G-9 Clock and Sleep Timer Max Time 120 Min
Timer Step 10 Min
On/Off Timer Program(On Tim / Off Tim) No
Wake Up Timer No
Timer Back-up (at Power Off Mode) more than -- Min Sec
G-10 Remote Unit RC-DW
Control
Format NEC
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 Yes
TV/Video(TV/AV) Yes
CH RTN/CH ENT(Quick View) Yes
Sleep Yes
RE Call(Call) Yes
Reset Yes
Menu Yes
Enter Yes
Mute Yes
Exit No
MTS(Audio Select) No
Set + Yes
Set - Yes
Multi Brand Keys CH Up(VCR) No
CH Down(VCR) No
No
A3-2
GENERAL SPECIFICATIONS
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Registration Card
No
TV/VCR(VCR) No
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
CATV Yes
Anti-theft No
Rental No
Memory(Last CH) Yes
Memory(Last Volume) Yes
V-Chip Yes
Type USA,ORION Type
BBE No
Auto Search No
CH Allocation No
SAP No
Channel Lock No
Just Clock Function No
Game Position No
CH Label No
VM Circuit No
Full OSD No
Premiere No
Comb Filter No
Lines
Auto CH Memory Yes
Hotel Lock No
Closed Caption Yes
Stable Sound No
Energy Star No
Favorite CH No
G-12 Accessories Owner's Manual Language English /French
w/Guarantee Card
Remote Control Unit Yes
Rod Antenna No
Poles
Terminal
Loop Antenna
Terminal
U/V Mixer
DC Car Cord (Center+)
Guarantee Card Yes
Warning Sheet
Circuit Diagram
Antenna Change Plug
Service Facility List
Important Safeguard
Dew/AHC Caution Sheet
AC Plug Adapter
Quick Set-up Sheet
Battery
UM size x pcs
OEM Brand
AC Cord
AV Cord (2Pin-1Pin)
A3-3
GENERAL SPECIFICATIONS
No
No
( 38.6 lbs)
( 44.1lbs)
No
Sets
/--
No
Surfaces
Sets/40' container
Cabinet Rear PS 94V0 DECABROM
PTB Sheet
300 ohm to 75 ohm Antenna Adapter
G-13 Interface Switch Front Power Yes
System Select No
Main Power SW No
Sub Power No
Channel Up/Reset Yes
Channel Down/Enter Yes
Volume Up/Set Up Yes
Volume Down/Set Down Yes
MENU=Volume Up+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
Audio Input
Other Terminal No
Rear Video Input(Rear1) No
Video Input(Rear2) No
Audio Input(Rear1) No
Audio Input(Rear2) No
Video Output No
Audio Output No
Euro Scart No
Color Stream No
Diversity No
Ext Speaker No
DC Jack 12V(Center +) No
VHF/UHF Antenna Input
AC Outlet No
G-14 Set Size Approx. W x D x H (mm) 488 x 465 x 416
G-15 Weight Net (Approx.) 17.5kg
Gross (Approx.) 20.0kg
G-16 Carton Master Carton
Content ---Material --
Dimensions W x D x H(mm) -- x -- x --
Description of Origin
Gift Box Yes
Material Double Full Color Carton W/Photo
Dimensions W x D x H(mm) 546 x 526 x 472
Design As per Buyer's
Description of Origin Yes
Drop Test
Height (cm) 46
Container Stuffing 436
G-17 Cabinet Material Cabinet Front PS 94V0 DECABROM
RCA
RCA x 1
F Type
Natural Dropping At 1 Corner / 3 Edges / 6
A3-4
DISASSEMBLY INSTRUCTIONS
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.
GND on the CRT
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
Fig. 1-3
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.)
Screwdriver
Alligator Clip
GND on the CRT
2.
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.)
Rubber Cap
CRT
Support
Support
CRT
Fig. 1-1
Fig. 1-2
Fig. 1-4
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.
Support
CRT
5.6.Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
Fig. 1-5
B1-1
DISASSEMBLY INSTRUCTIONS
2.
REMOVAL AND INSTALLATION OF
FLAT PACKAGE IC
REMOVAL
Put the Masking Tape (cotton tape) around the Flat
1.
Package IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
NOTE
Masking is carried out on all the parts located within
10 mm distance from IC leads.
3.
When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
NOTE
Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
Blower type IC
desoldering
machine
Masking Tape
(Cotton Tape)
Heat the IC leads using a blower type IC desoldering
2.
IC
machine. (Refer to Fig. 2-2.)
NOTE
Do not add the rotating and the back and forth
directions force on the IC, until IC can move back and
forth easily after desoldering the IC leads completely.
Blower type IC
desoldering machine
Fig. 2-1
Tweezers
IC
Peel off the Masking Tape.4.
Absorb the solder left on the pattern using the Braided
5.
Shield Wire. (Refer to Fig. 2-4.)
NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
Fig. 2-3
Braided Shield Wire
Soldering Iron
IC
Fig. 2-2
IC pattern
Fig. 2-4
B2-1
DISASSEMBLY INSTRUCTIONS
INSTALLATION
1.
Take care of the polarity of new IC and then install the
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
Soldering Iron
Solder temporarily
Supply the solder from the upper position of IC leads
2.
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
Solder temporarily
Fig. 2-5
When bridge-soldering between terminals and/or the
4.
soldering amount are not enough, resolder using a Thintip Soldering Iron. (Refer to Fig. 2-8.)
Thin-tip Soldering Iron
IC
Fig. 2-8
5.
Finally, confirm the soldering status on four sides of the
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
NOTE
When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.
Soldering IronSolder
IC
Absorb the solder left on the lead using the Braided
3.
Supply soldering
from upper position
to lower position
Shield Wire. (Refer to Fig. 2-7.)
NOTE
Do not absorb the solder to excess.
Soldering Iron
IC
Braided Shield Wire
Fig. 2-6
Fig. 2-7
B2-2
Loading...