FILE NO. SM-CTV-O-155
COLOR TELEVISION
SERVICE MANUAL
MODELNO.
CHASSIS NO. CN-18EA
21BM91
(V2)
Please read this manual carefully before service.
TABLE OF CONTENTS
SPECIFICATIONS
............................................................................................................1
SAFETY INSTRUCTIONS AND MAINTENANCE.......................................2
X-RAY RADIATION PRECAUTION.........................................................................................2
SAFETY PRECAUTION ..........................................................................................................2
PRODUCT SAFETY NOTICE..................................................................................................3
SAFETY SYMBOL DESCRIPTION .........................................................................................4
MAINTENANCE.......................................................................................................................4
ADJUSTMENTS................................................................................................................ 5
SET-UP ADJUSTMENTS ........................................................................................................ 5
CIRCUIT ADJUSTMENTS....................................................................................................... 8
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION................. 24
STRUCTURE BLOCK DIAGRAM .........................................................................................24
BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM .......................................................25
CHASSIS DESCRIPTION .....................................................................................................26
SERVICE DATA............................................................................................................... 27
TECHNICAL DATA OF KEY ICS ..........................................................................................27
SERVICE DATA OF KEY ICS ............................................................................................... 51
REPLACEMENT OF PARTS
...................................................................................58
APPENDIX
1. CIRCUIT DIAGRAM
2. FINAL ASSEMBLY DIAGRAMS
3. FIND WIRING DIAGRAMS
4. PRINTED CIRCUIT BOARD LAYOUTS
SPECIFICATIONS
SERVICE MANUAL
Table 1 Specifications
Model Number
Color
PAL, NTSC3.58, NTSC4.43, SECAM
system
RF system
Sound
system
Video system PAL4.43, NTSC3.58, NTSC4.43, SECAM (50/60Hz)
Channels preset 236 (0-235)
Antenna input
Picture tube
Effective screen dimensions
(Approx.)
Audio output
(THD
7%)
21BM91
75
406
B/G, D/K, I, M
(unbalanced)
305mm
3W+3W
Power source 220V ~, 50Hz
Weight (Approx.)
Dimensions
(W
H D) (Approx.)
Rated power consumption
(220V ~, 50Hz)
Designs and specifications are subject to change without notice.
590
22kg
451
87W
475mm
1
SERVICE MANUAL
SAFETY INSTRUCTIONS AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION
PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT SAFETY NOTICE”INSTRUCTION
BELOW.
X-RAY RADIATION PRECAUTION
1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit
X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any
operating circumstances must not exceed the rated value. When checking the EHT, use the High
Voltage Check procedure in this manual using an accurate EHT voltmeter.
2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation,
which ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT
must be
3. Some components used in this TV have safety related characteristics preventing the CRT from
emitting X-ray radiation. For continued safety, replacement component should be made after
referring the PRODUCT SAFETY NOTICE below.
4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT
anode. So ensure that the maximum EHT voltage does not exceed the rated value after service
and adjustment.
identical to the original fitted as specified in the parts list.
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working
on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for
working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take
extreme care while handling.
1.4 Do not hold the CRT by the neck as this is a very dangerous practice.
2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly
as supplied from factory.
3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable
isolating transformer of beyond rated overall power when servicing or connecting any test
equipment for the sake of safety.
2
SERVICE MANUAL
4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).
5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to
avoid electronic gun magnetized and decrement in convergence of the CRT.
6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,
switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the
original place.
7. Replace blown fuses within the TV with the fuse specified in the parts list.
8. When replacing wires or components to terminals or tags, wind the leads around the terminal
before soldering. When replacing safety components identified by the international hazard symbols
on the circuit diagram and parts list, it must be the company-approved type and must be mounted
as the original.
9. Keep wires away from high temperature components.
PRODUCT SAFETY NOTICE
CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE
SHOULD BE READ CAREFULLY BEFORE OPERA TING AND SERVICING THIS TV SET.
1. Many electrical and mechanical components in this chassis have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and the
X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements
rated at higher voltages or wattage, etc. Components which have these special safety
characteristics in this manual and its supplements are identified by the international hazard
symbols on the circuit diagram and parts list. Before replacing any of these components read the
parts list in this manual carefully. Substitute replacement components which do not have the same
safety characteristics as specified in the parts list may create X-ray radiation.
2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.
3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result
in too large load, causing fire.
4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being
walked on, modified, cut or pinched, particularly at plugs.
5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install
the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that
produce heat.
6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and
servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.
3
SERVICE MANUAL
SAFETY SYMBOL DESCRIPTION
The lightning symbol in the triangle tells you that the voltage inside this product may
be strong enough to cause an electric shock. Extreme caution should be exercised
when working on the TV with the back removed.
This is an international hazard symbol, telling you that the components identified by
the symbol have special safety-related characteristics.
FDA This symbol tells you that the critical components identified by the FDA marking have
special safety-related characteristics.
UL This symbol tells you that the critical components identified by the UL marking have
special safety-related characteristics.
C UL This symbol tells you that the critical components identified by the C-UL marking
have been evaluated to the UL and C-UL standards and have special safety-related
VDE
characteristics.
This symbol tells you that the critical components identified by the VDE marking have
special safety-related characteristics.
MAINTENANCE
1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from
being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a
radiator or heat register, or where it is exposed to direct sunlight.
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or
impacts.
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.
4. Slots and openings in the cabinet should never be blocked by clothes or other objects.
5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition
are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.
Hold the plug firmly when disconnecting the power cord.
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.
4
SERVICE MANUAL
ADJUSTMENTS
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new picture
tube is installed.
Perform the adjustments in the following order:
1. Color purity
2. Convergence
3. White balance
Notes:
① The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
② For some picture tubes, purity/ convergence adjustments are not required.
1. Color Purity Adjustment
Preparation:
Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and
focus.
1.1 Face the TV set north or south.
1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.
1.3 Operate the TV for at least 15 minutes.
1.4 Degauss the TV set using a specific degaussing coil.
1.5 Set the brightness and contrast to maximum.
1.6 Counter clockwise rotate the R /B low brightness potentiometers to the end and rotate the green
low brightness potentiometer to center.
1.7 Receive green raster pattern signals.
1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to
display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet
around the neck of the CRT until the green zone is located vertically at the center of the screen.
1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is
obtained.
1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue
raster until purities of the three rasters meet the requirement.
5
SERVICE MANUAL
Yok
Fig. 1
2. Convergence Adjustment
Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.
2.1 Center convergence adjustment
2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps 2.1.3～2.1.5 until optimal convergence is
obtained.
2.2 Circumference convergence adjustment
2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.
2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move
front of the deflection yoke up or down to obtain better convergence in circumference. Push the
mounted wedge in to fix the yoke temporarily.
2.2.3 Put the second wedge into bottom.
2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in
circumference.
2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the
6
SERVICE MANUAL
deflection yoke assembly on the picture tube.
2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection
yoke assembly on the picture tube.
2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal
convergence. Tighten the lamp screw holding the deflection yoke assembly.
Fig. 2
4-pole Magnet Movement 6-pole Magnet Movement
Center Convergence by Convergence Magnets
Incline the Yoke Up (or Down) Incline the Yoke Right (or Left)
Circumference Convergence by DEF Yoke
3. White Balance Adjustment
Fig.3
Generally, white balance adjustment is made with professional equipment. It’s not practical to get
good white balance only through manual adjustment. For TVs with I
data to adjust white balance.
2
C bus control, change the bus
7
SERVICE MANUAL
CIRCUIT ADJUSTMENTS
Preparation:
Circuit adjustments should be made only after completion of set-up adjustments.
Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with
2
I
C bus control, first change the bus data.
1. Degaussing
A degaussing coil is built inside the TV set. Each time the TV is powered on, the degaussing coil
will automatically degauss the TV. If the TV is magnetized by external strong magnetic field,
causing color spot on the screen, use a specific degausser to demagnetize the TV in the following
ways. Otherwise, color distortion will be shown on the screen.
1.1 Power on the TV set and operate it for at least 15 minutes.
1.2 Receive red full-field pattern.
1.3 Power on the specific degausser and face it to the TV screen.
1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.
1.5 Repeat the above steps until the TV is degaussed completely.
2. Confirmation and Adjustment for Voltage
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to
the rated value.
2.1 Make sure that the supply voltage is within the range of the rated value.
2.2 Connect a digital voltmeter to the voltage output terminal of the main PCB. Power on the TV and
set the brightness and sub-brightness to minimum. Ensure that the voltage from the main PCB
reads as follows.
2.3 Regulate voltage adjustment components on the power section until the +B the voltage reaches the
rated value.
Table 2
Test Point Voltage (V)
Negative of VD851 118V±2V
Negative of VD852 17V±1V
Negative of VD854 11V±1V
Negative of VD857 14V
+1V
-1.5V
Positive of C874 9V±0.5V
Positive of C878 5V±0.5V
Positive of C800 5V±0.25V
Note:
It’s impossible to check the power part separately from the main chassis board as the part is
mounted on the main chassis board. The power components, etc. should be checked for burnout
when power-on. If burned out, do not power on the TV again until the cause is found out.
8
SERVICE MANUAL
3. High Voltage Inspection
Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high
voltage with the high-voltage testing equipment and heater voltage with the high-frequency
effective voltmeter. The rated values are shown as below.
Table 3
Test Point Voltage (V)
Negative of VD603
Negative of VD855A 190±5.0V
25±1.5V
27±1.5V (for BSC68V1 FBT only)
CRT anode
Heater 6.3±0.3Vrms
25±1.5KV
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the
FBT.
4.2 Power on the TV and preheat it for 15 min.
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
Before Adjusting After Adjusting
Fig. 4
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit
current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and ensure
no arcing and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be infinity
9
SERVICE MANUAL
(
with a DC-500 high resistance meter and insulation resistance between the naked metal and
degaussing coil to be over 20MΩ.
6. SERVICE mode
6.1 To enter the DESIGN/SERVICE mode
Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the
MENU button on the TV to enter the SERVICE mode. In this case, red “S”is displayed on the
upper center of the screen. To exit from the S mode, turn off the TV set by the POWER button on
the remote control.
Caution: The user service mode adjustment can be changed only when service personnel adjust
the whole set data during servicing. As the control data have dramatic effects on functions and
performance of the TV, service personnel should not tell user how to enter the SERVICE mode to
avoid improper data settings.
6.2 Adjustments and bus data (CH08T0606)
Table 4 Function Description for Bus Data
MODE0
Bit Function Description Status
Audio system options (available during
Bit7.6
auto search and use of AUTO button)
Bit5
SECAM
Bit4
Bit3 V MUTE
INHIBIT
00: B/G 01: I
10: D/K 11: M
00: SECAM gate pulse width, 2.2
usec
01: 2.0 usec
10: 1.8 usec
11: SECAM demodulation inhibit
When changing channels:
0: Y-MUTE 1: RGB MUTE
Bit2 SECAM
Bit1 AUTO2 0: PAL 1: Without PAL
Bit0
Power-on modes
10
0: No 1: Yes
0: Memory on 1: Soft on
continued)
SERVICE MANUAL
(
MODE1
Bit7 Write-in LOGO
Refresh AV terminals in main
0: No 1: Yes
0: Yes (Recommended) 1: No
Bit6
cycle
Bit5 RF NTSC options 0: No 1: Yes
Bit4 Screen saver 0: No 1: Yes
Bit3 M 0: No 1: Yes
Bit2 D/K 0: No 1: Yes
Bit1 I 0: No 1: Yes
Bit0 B/G 0: No 1: Yes
With Channel Lock, horizontal
0: Yes (Recommended) 1: No
Bit7
AFC is off?
Bit6 Mono system
1: Yes 0：No
MODE2
Bit5 Single language
TA1343 woofer or MDB output
Bit4
mode options
Bit 3 Pull down sub menus?
Bit 2
Bit 1
Auto language options
Bit.0
1: Yes 0：No
0: Mono output 1: Overlapped to main
channel（Recommended）
1: Yes 0：No
0 0 0 ENGLISH
0 0 1 FRENCH
0 1 0 GERMAN
0 1 1 RUSSIAN
1 0 0 INDONE
1 0 1 MALAY
1 1 0 FARSI
1 1 1 ARABIC
MODE3
BIT 7
(Recommended)
continued)
Small character processor 1: Old 0: New
11
SERVICE MANUAL
(
Waiting time when changing
1: Fast (1 sec.) 0: Slow (2 sec.)
BIT 6
channels with 0-9 buttons
(Recommended)
1: No 0: Yes
BIT 5 DVD option
(Recommended)
Step length setting for lighting up
1: Large step (Recommended) 0：Small
BIT.4
gradually during power-on
Numeral in Arabic indicated in
step
0: No 1: Yes
BIT 3
local language?
BIT 2 PWM output option 0: No 1: Yes
BIT 1 Instant on
BIT 0
AV Switch 4053 option
1: Yes 0：No
0: No 1: Yes
Audio processing IC (SOUND
BIT 7
0: No 1: Yes
menu)
MODE4
BIT 6 Woofer option in SOUND menu
BIT 5 TA1343 option
BIT 4 No use
BIT 3
NJW1161 option (SRS IC)
NJW1160 option (BBE IC & SRS
BIT 2
IC)
BIT 1
BIT 0
NJW1137 option (BBE IC)
Soft IIC option
Bit 7 No use OPT
Bit 6
VCO adjustments
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: No 1: Yes
0: PIF VCO functions (PIFVCO = 10) during
auto search and search；
1: PIFVCO = 10 during turn-on，and PIFVCO =
00 in Normal mode
continued)
12
SERVICE MANUAL
Bit 5 No use
Large-amplitude AFT switch when no
Bit 4
signal
Bit 3
Audio gain switch in MONO mode
Bit 2 Y-MUTE when changing channels 0: No 1: Yes
Turn-on logo display? (Logo
Bit 1
write-in function required)
Bit 0 No use
OSD
Horizontal position of OSD
RCUT R cut off
GCUT G cut off
1: Off 0: On
0：927mVrms at 25kHz/dev
1：500mVrms at 25kHz/dev
1: Yes 0: No
BCUT B cut off
GDRV G drive
BDRV B drive
CNTX Contrast Max.
BRTC Bright center
CNTC Contrast center
CNTN Contrast Min.
BRTX Bright Max.
BRTN Bright Min.
HPOS 50hz horizontal phase
VP50 V phase (50Hz)
00: -3usec 10: 01F: +3usec
0: V phase delay, 0H 7: 7H
HIT V size
00: -50% 20: 0% 3F: 50%
(continued)
13
SERVICE MANUAL
HPS
Adjusting difference between horizontal centers in PAL and NTSC
VP60 V phase (60Hz)
HITS
Adjusting difference between vertical amplitudes in PAL and NTSC
VLIN V-linearity
VSC V-S correction
VLIS
VSS
Adjusting difference between vertical linear in PAL and NTSC
Shift data of 50 Hz/ 60 Hz Correction
HIT69 Vertical amplitude in 16:9 mode (PAL)
HIT69S Vertical amplitude in 16:9 mode (NTSC)
V01 Volume output data at 1%
V25
Volume output data at 25%
0: V phase delay, 0H 7: 7H
0: -15% 8: 0% F: 15%
0: -16% 8: 0% F: 16%
V50
V100
Volume output data at 50%
Volume output data at 100%
Bit 3.2 VCD standby
STBY
Bit 1.0 IF standby
VCEN Vertical centering
Bit 7 Arabic 1: Yes 0: No
Bit 6 Farsi 1: Yes 0: No
Bit 5 Malay 1: Yes 0: No
Bit 4 Indonesian 1: Yes 0: No
LANG
Bit 3 Russian 1: Yes 0: No
Bit 2 German 1: Yes 0: No
00: Normal 01: Normal
10: Normal 11: VCD standby
00: Normal 01: Normal
10: Normal 11: IF standby
00: -32% 20: 0% 3F: 30%
Bit 1 French 1: Yes 0: No
BIT 0 English 1: Yes 0: No
14
SERVICE MANUAL
Table 5 Bus Data
Item Data Item Data Item Data Item Data
*MODE0 84 SCNT 09 HPOS 11 BSNS 00
*MODE1 1F CNTC 40 VP50 01 MOD 40
*MODE2 1B CNTN 08 HIT 18 STBY 00
*MODE3 18 BRTX 19 HPS 04 SVM 00
*MODE4 60 BRTN 20 VP60 02 VBLK 00
*LANG FF COLX 35 HITS 01 UCOM 00
NOT MENU 9E COLN 00 VLIN 05 VTST 00
MEUN ICON FB TNTX 28 VSC 00 PYNX 26
MAIN MEUN 91 TNTN 28 VLIS 00 PYNN 1B
MEUN CHAR 07 ST3 25 VSS 00 PYXS 22
MEUN CHAR
HIGH
02 SV3 30 VCEN
16
PYNS 1E
BBE 9C ST4 20 HIT69 14 BASC 40
OSDF 64 SV4 30 HIT69S 01 BASX 70
OSD 20 SVD 30 SBY 05 TREC 40
*OPT 60 ASSH 07 SRY 09 BALC 40
RCUT 40 SHPX 3F BRTS 00 BAS1 64
GCUT 20 SHPN 20 RAGC 20 BAS2 20
BCUT 20 TXCX 3F HAFC 09 BAS3 50
GDRV 40 RGCN 1F *V01 15 TRE1 64
BDRV 40 ABL 2C *V25 4D TRE2 20
CNTX 7F DCBS 13 *V50 65 TRE3 50
BRTC 40 CLTO 26 *V100 7F TA1343-06 6C
COLC 40 CLTM 22 WOOFER 40 NO USE 00
TNTC 48 CLTS 20 STAT 00 NO USE 64
TNTCAV 48 CLVO 24 FLG0 06 WON1 01
COLP F8 CLVD 20 FLG1 08 WON2 00
COLS 40 DEF 01 REFP 00 NOIS 01
DCOL 20 AKB 00 RSNS 00 VATT 70
SCOL 07 SECD 18 GSNS 00
Notes:
The data sheet may differ dependent on different models.
The data sheet may differ dependent on different CRTs for the same model.
Refer to table 4 set the data marked with “*” defending on functions of TVs.
15
SERVICE MANUAL
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION
1. STRUCTURE BLOCK DIAGRAM
EE PRO M
AT2 4C1 6
D7 02
I
2
C
Y
Cb
Cr
S-Terminal
ABL
H
L
Bu tton s On
Circ ui for
The TV
TMP A88 01PS BN G
2IN I IC
N2 01
Rem ote con trol
HS 003 8
Rem ote
Sen sor
Tun er
U1 01
IF Pro-am p.
+SAW F
V in
V out
HE F40 53B P
AV Swit ch
TV Audio
N
3
50
A in
A out
N302
TA1343N
Lin e Drive
V4 04
I2C
TD A8 94 4 AJ
N3 01
T40 1
Vertical O ut
LA 780 40
N6 02
V9 01-V90 3
Am plifier
Vid eo
L
R
Horizonta l
Ou tpu t
V4 05
T40 2
FB T
HV
FV
SV
R G B
9V-2
220V
50Hz
CRT
Power Circuit
STR-G5653
N801
12V
120V
17V
9V
5V-1
5V-2
16
Loading...