AOC S992 Series User manual

SERVICE MANUAL
COLOR MONITOR
S992 Series
P/N : S992X-3-01-A
Date : Jul-29-02
Version : A00

3
1. SPECIFICATIONS FOR 9Glr SERIES COLOR MONITOR
1. CRT : 46CM(19") 90 Deflection, 29mm Neck, flat 0.26mm Dot Pitch, Non-Glare Screen
2. Viewable image Size: 45.7CM (18") diagonal
3. Display Color: Unlimited Colors
4. External Controls:
Power On/Off, OSD key, Function knob: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, ZOOM,
Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Moire Reduce, Recall, Degaussing, Color
Temperature, Volume. (For 9GlrA Model)
5. Input Video Signal
Mode 1 Mode 2 Mode 3 Mode 4
RGB Analog RGB Analog RGB Analog RGB Analog
Horiz. Sync: TTL Level TTL Level TTL Level TTL Level
Negative Negative Negative Positive
Vert. Sync: TTL Level TTL Level TTL Level TTL Level
Positive Negative Negative Positive
Horizontal: 720 (H) 640 (H) 640 (H) 800 (H)
Vertical : 400 (V) 480 (V) 480(V) 600(V)
Fh (kHz): 31.327 31.469 43.269 53.750
Fv (Hz) : 69.616 59.9 85.008 84.997
Mode 5 Mode 6 Mode 7 Mode 8
RGB Analog RGB Analog RGB Analog RGB Analog
Horiz. Sync: TTL Level TTL Level TTL Level TTL Level
Positive Positive Positive Positive
Vert. Sync: TTL Level TTL Level TTL Level TTL Level
Positive Positive Positive Positive
Horizontal: 1024 (H) 1280 (H) 1280 (H) 1600 (H)
Vertical : 768 (V) 960 (V) 1024 (V) 1200 (V)
Fh (kHz): 68.677 85.935 91.148 93.75
Fv (Hz) : 84.997 85 85 75
6. Display Size
Horizontal: 346 mm
Vertical: 260 mm
7. Scanning Frequencies
Horizontal: 30KHz ~98KHz
Vertical: 50 Hz ~160 Hz
8. Factory Preset Timings: 8
User Timings: 20
9. Mis-convergence
Center: 0.3 mm Max.
Corner: 0.4 mm Max.
10. Video Dot Rate: 200 MHz

5
2. PRECAUTIONS AND NOTICES
2-1 SAFETY PRECAUTIONS
1. Observe all caution and safety related notes located inside the display cabinet.
2. Operation of the display with the cover removed, may cause a serious shock hazard from the display power
supply. Work on the display should not be attempted by anyone who is not thoroughly familiar with
precautions necessary when working on high voltage equipment.
3. Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles are worn.
People who are not so equipped should be kept away while handling picture tube. Keep picture tube away
from the body while handling.
4. The picture tube is constructed to limit X-RAY radiation to 0.5 mR/HR. For continued protection, use the
designated replacement tube only, and adjust the voltages so that the designated maximum rating at the
anode will not be exceeded.
5. Symbol “★“ means safety relative parts. The use of substitute replacement parts which do not have the
same characteristics as specified in the parts list may create shock, fire or explode etc.
6. Symbol “ ” means X-ray relative parts. Before replacing any of these components please read the parts list
in this manual carefully to avoid creating higher anode voltage or x-ray. Especially for sealed controls, such
as VR902, VR702 and FBT screen VR etc, which were sealed by the manufacturer once their optimum
position has been set, please don’t dismantle them as your likes, otherwise you will break or damage the
component. If you need replace the parts with sealed control, please adjust the relative VR to make sure the
B+ voltage under 61.8Vdc at 640*480@60Hz and well seal it with A+B glue or equivalent, which you can
not move away with one screw driver.
7. Before returning a serviced display to the customer, a thorough safety test must be performed to verify that
the display is safe to operate without danger or shock. Always perform an AC leakage current check on the
exposed metallic parts of the cabinet, such as screw heads.
Test method for current leakage is described as follow.
(a) Plug the AC line cord directly into rated AC outlet (do not use a line isolation transformer during this
check).
(b) Use an AC voltmeter having 5000 ohms per volt or with more sensitivity in the following manner:
Connect a 1500 ohms 10 Watt resistor, paralleled by a 0.15UF, AC type capacitor between a known
good earth ground (water pipe, conduit, etc.) and the exposed metallic parts simultaneously. Measure
the AC voltage across the combination of 1500 ohms resistor and 0.15UF capacitor.
(c) Reverse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic
part.
(d) Voltage measured must not exceed 0.5 volts RMS. This corresponds to 0.35 milliamp AC. Any value
exceeding this limit constitutes a potential shock hazard and must be corrected immediately.
2-2 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection
afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of
substitute replacement parts which do not have the same safety characteristics as specified in the parts list may
create shock, fire, X-RAY radiation or other hazards.
2-3 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
2. When replacing a high wattage resistor (more than 1/2W of metal oxide film resistor) in circuit board, keep
the resistor about 10mm (1/2 in) away from circuit board.
3. Keep wires away from high voltage or high temperature components.
4. Keep wires in their original position so as to reduce interference.

7
3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the 9G color display.
1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-
wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and
cabinet to the electrical conduit ground. If the AC outlet in your location does not have provisions for the
grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws
on the connector to ensure firm grounding. The connector information is as follow:
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION PIN NO. DESCRIPTION
1. RED 9. NC
2. GREEN 10. GND
3. BLUE 11. SYNC. GND
4. GND 12. SDA
5. GND 13. HORIZ. SYNC
6. GND-R 14.
VERT. SYNC (＊VCLK)
7. GND-G 15. SCL
8. GND-B
3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty
seconds for display tube warm-up. The Power-On indicator lights when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness
and contrast to the most pleasing display.
5. This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable to
the PC.
6. If your 9G Series color display requires service, it must be returned with the power cord.
1
6
11 15
5
10

8
4. ADJUSTMENT
4-1ADJUSTMENT CONDITIONS AND PRECAUTIONS
1. Approximately 30 minutes should be allowed for warm up before proceeding.
2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully
preset at the factory.
4-2 MAIN ADJUSTMENTS
NO. FUNCTION LOCATION DESIGNATION
1. B + ADJ PCB - MAIN VR902
2. SCREEN ADJ FLY BACK TRANS T402
3. FOCUS ADJ FLY BACK TRANS T402
4. ABL ADJ PCB - MAIN VR701
5. SUB-BRIGHTNESS ADJ PCB - MAIN VR702
4-3 ADJUSTMENT METHOD
1. B + & HV voltage adjustment and hold down circuit confirmation:
A. Chrome-2000 Signal generator or PC equivalent set mode 2, VGA 640X680@60Hz pattern 1 .
B. Connect a DC Volt meter between TP902 or D925 cathode and ground, then adjust VR902 to be
61.8VDC(B+).
C. Connect a DC Volt meter between TP701(G1) and ground, Brightness set to max. Then adjust VR702 to
be -40 VDC.
D. Connect a 22kΩresistor in parallel with R419 to increase the HV, the hold down circuit will operate and
the display will disappear. Then disconnect this resistor to bring the unit to normal condition.
2. Factory preset Timings Adjustment:
A. Press MENU Key to show OSD window press Up or Down Key to switch the functional controls.
B. Press the Up Key to select the "ZOOM" function, then press the MENU Key. While do not release the
MENU Key until the OSD window changed to the Factory preset window.
C. The Factory preset window contains the following functional controls. Select one of the control by press
the MENU key. Then press the Up/Down Key to adjust it's value for the optimum picture.
MENU Key to Quit the OSD window. Mean while the new setting data will be saved in the memory.
E. To switches the input signal to the other Timing Mode. Please follow step C ~ D to get the optimum picture.
F. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will be
returned to the original OSD window.(user's operating condition)
G. The setting data of the CONTRAST, BRIGHTNESS, PIN-BALANCE, PARALLELOGRAM,
ROTATION, COLOR TEMPERATURE are common mode saved in the memory. Don't needed adjust it
individual at every timing Mode and save in the memory.
H Model select: for factory only, service engineer can't changed.

9
080
FACTORY PRESET
H: 36.51kHz V: 51.34Hz
VcVs
Tm
9300 6500
CONTRAST H-MOIRE REDUCE
BRIGHTNESS V-MOIRE REDUCE
H-CENTER R-GAIN
H-SIZE G-GAIN
V-CENTER B-GAIN
V-SIZE R-BIAS
ZOOM G-BIAS
TOP COMER R-BIAS
BOTTOM COMER 9300 COLOR TEMPERATURE
PINCUSHION 6500 COLOR TEMPERATURE
TRAPEZOID DEGAUSS
PIN-BALANCE OSD EXIT
PARALLELOGRAM RETURN
ROTATION
Vs LINEAR
HS SUB-H-SIZE
Vc LINEAR
HP H-SIZE-PHASE B/I ON/OFF
Tm Used time
BC
BCBC
BC
TC
TCTC
TC
BI
BIBI
BI
BC
BCBC
BC
TC
TCTC
TC
BI
BIBI
BI
HS HP
H: 68.8KHz V: 85Hz
70

10
3. White Balance, Luminance adjustment:
A. Bias (Low Luminance) adjustment:
(a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern.
(b) To make the adjustment condition is under the Factory preset window.
Same as step 2-C.
(c) Warm up more than 30 minutes.
(d) Brightness set to maximum. Contrast set to max. full white pattern, then adjust FBT screen
VR to make Y= 4.0±0.5cd/m2.
(e) Adjust G-Bias , B-Bias , R-Bias , to make the setting value is(20), then adjust the
R.G.B Bias individual to the color temperature x=265 ±10, y= 290 ±10, Y= 4.0±0.5cd/m2.
B. Gain (High light) adjustment:
(a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern.
(b) Brightness set to raster just cut off and set the contrast to max.
(c) Adjust G-Gain , B-Gain , R-Gain , to make color temperature x=283 ±10, y=297±
10, Y=130~140 cd/m2.
C. Recheck item A&B to make sure both of them in spec. Finally select OSD function to the 9300°K function,
then press the MENU Key. To make the setting data saved in the memory.
D. The adjustment of 6500°K white Balance, May follow step A ~ C , with the x=313 ±10, y=329 ±10,
Y=130~140 cd/m2.
E. Full white luminance:
(a) Set mode 2 640 x 680 Fh: 68.7KHz full white pattern.
(b) Image Size : H:346±4mm V:270±4mm.
(c) Brightness set to raster just cut off and set the contrast to max.
(d) Adjust VR701 to the luminance at 90~95 cd/m2.
4. Focus Adjustment:
A. Set mode 5 1024 x 768 Fh: 68.7KHz with character full page.
B. Brightness to cut off and contrast to max.
C. Then adjust focus VR1 to a fine vertical line.
D. Adjust focus VR2 to a fine horizontal line.
E. Repeat step C & D..
5. Purity Adjustment
A. Be sure that the display is not being exposed to any external magnetic fields.
B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is
29mm .(See below diagram)
C. Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to
obtain a complete field of the color red. This is done by moving the two tabs in such a manner that they
advance in an opposite direction but at the same time to obtain the same angle between the two tabs, which
should be approximately 180'.
D. Check the complete blue and complete green patterns to observe their respective color purity. Make minor
adjustments if needed.

11
RELATIVE PLACEMENT OF TYPICAL COMPONENTS
Purity Magnets
Deflection Yoke
4-pole Convergence Magnets
6-pole Convergence Magnets
6. Convergence adjustment
A. Produce a magenta crosshatch on the display.
B. Adjust the focus for the best overall focus on the display.
Also adjust the brightness to the desired condition.
C. Vertical red and blue lines are converged by varying the angle between the two tabs of the 4 pole magnets
on the PCM assembly. (See above diagrams)
D. Horizontal red and blue lines are converged by varying the two tabs together, keeping the angle between
them constant.
E. Produce a white crosshatch pattern on the display.
F. Vertical green and magenta lines are converged by varying the angle between the two tabs of the 6-pole
magnets.
G. Horizontal green and magenta lines are converged by varying the two tabs together, keeping the angle
between them constant.
5. CIRCUIT DESCRIPTION
5-1 MICRO CONTROLLER CIRCUIT
MICRO Controller
The IC101 contains a 6502 8-bit CPU core, 256 bytes of RAM, 16K bytes of ROM,14 channel 8 bit PWM D/A
converters, 2 channel A/D converters for key detection, one 8 bit pre-loadable base timer, internal H-sync and V-
sync signals processor providing mode detection, watch- dog timer preventing system from abnormal operation,
and an I2C bus interface.
H/V sync signals processor
The functions of the sync processor include polarity detection, H-SYNC & V-SYNC signals counting,
Programmable SYNC signals output, free running signal generator. Pin41/Pin42 are for the H-SYNC and V-
SYNC input, Pin33/Pin34 will output the same signal as input sync signal without delay, and the polarity are
setting in the positive. When no signal input, the Pin33 will output a 61HZ V-SYNC free run signal. The Pin34
will output a 62.5KHz H-SYNC free run signal. for the monitor testing use.

12
On Screen Display Controller
The IC804 is designed for display the built-in characters or fonts onto monitor screen. The display operation is by
transforming data and control information from micro controller to RAM through a serial data interface.
Pin 2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R830,
C811, R833) and filter (R126, C115) is used to regulate the appropriate bias current for internal oscillator the
resonate at specific dot frequency.
Pin5 is input the horizontal fly back pulse, for PLL generator tracking.
Pin6 is left floating, I2C bus is enabled. Otherwise the SPI bus is enabled.
Pin7 the external data transfer through this pin to internal display registers and control registers
Pin8 the clock-input pin is used to synchronize the data transfer.
Pin10 is input the vertical flyback pulse for synchronizing the vertical position.
Pin12 is output a blanking signal to cut off external R.G.B signals of VGA while this chip is displaying characters
or windows.
Pin13, Pin14, Pin15 is used to output the OSD (B.G.R) video signal.
5-2 DEFLECTION CIRCUIT
The deflection circuit is achieved by a high performance and efficient solution IC 401 (UPC1888ECT) for this
monitor. The concept is fully DC controllable and can be used in applications with a micro-controller solutions.
The UPC1888ECT provides sync. Processing with full auto sync. capability, a flexible SMPS block and an
extensive set of geometry control facilities. Further the IC generates the drive waveforms for DC coupled vertical
boosters to the TDA9302H .
Horizontal Oscillator
The oscillator is of the relaxation type and requires a capacitor of 390nF C403 at pin 23. The maximum oscillator
frequency is determined by a resistor R443 from pin 22 to ground.
PLL2 Phase Detector
This phase detector compares the line flyback pulse at pin 18 with the oscillator saw-tooth voltage. The HFL0
detector thus compensates for the delay in the external H-deflection circuit by adjusting the phase of the HDRV
output pulses. The phase between H-flyback and H-sync can be controlled at pin21.
X-ray Protection
The X-ray protection input pin 19 provides a voltage detector with a precise threshold. If the voltage exceeds this
threshold for a certain time, an internal latch switches the whole IC into protection mode. In this mode several pins
are forced into defined states:
Pin17 (HDRV) is floating
Pin 12 (BDRV) is floating
Vertical Oscillator
The vertical free –running frequency is determined by the capacitor C604 at pin 2 and resistor R608 at pin20.
Usually the free-running frequency should be lower than the minimum trigger frequency.

13
5-3 TRANSISTOR & DIODE CIRCUIT
LOCATION
FUNCTION AL DESCRIPTION
D101 For C102 Discharge
D405 Speed up for Q403
D406 Supply a bias for D408
D408 Damping Diode and Modulation Diode
D414~ D416,D418 Buffer Diode for Q412, Q417, Q418, Q420
Q401 B+ Mute Control
Q402 Horizontal Driver
Q403 Horizontal Out Put
Q404, Q406 A differential Amp for Drive Q405
Q405 Darlington Transistor for H-Size Control
Q407 Horizontal Linearity Correction Control
Q410, Q412,
Q417,Q418
Horizontal S-Correction Control
D707 Mixing Diode
D704 Rectifier for 250V Supply
D709 Protection Diode for Q708
D706,D708 Rectifier for -200V Supply
Q707 Picture Mute Control AMP
Q703, Q706 Brightness Control CKT
Q708 Vertical Dynamic Focus Control AMP
DB901 Bridge Rectifier for AC Source
D918 ~ D919 Rectifier for Output Voltage Supply
D921 ~ D923 Rectifier for Output Voltage Supply
D924 Clip Diode for Trigger CKT
D925 Rectifier for B+ Supply
D926, D927 Raster Position Control
D939 Clip Diode for Snuffer Pulse
ZD901 Protection Diode
ZD903 Protection Diode
Q911 MOS FET for B+ Control
Q912, Q915 Push Pull Driver for Q911
Q914 Pre-Amplifier for Q912, Q915
Q850 ~ Q852 DC Restoration for CRT Bias Adjustment

14
6.TROUBLE SHOOTING CHART
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
REFER ITEM S.M.P.S.
CHECK CRT'S HEATER RELATIVE
CIRCUIT
BRIGHTNESS SET TO MAX.
THEN CHECK CRT G1 VOLTAGE
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
CHECK THE HIGE VOLTAGE
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK VOLTAGE OF THE CRT
CHECK BRIGHTNESS CIRCUIT
OK
CHECK POWER SAVING CIRCUIT,
"ABNORMAL DISPLAY"
H-SYNC, V-SYNC SIGNAL
REFER ITEM 8-2
CATHODE ABOUT 60V TO 70V
CHECK SCREEN VOLTAGE ABOUT
400V TO 700V
OF CRT ABOUT 25.5 ~ 26.5KV
LESS THAN 300V CHECK FBT
CHECK MAIN PCB POWER SUPPLY
60.5V, 14.5V, 80V
CHECK FAILSAFE CKT IC401
PIN 2 RELATIVE CKT.
Q703, Q706, Q707 RELATIVE CKT.
26.5~27.5KV
CHECK MAIN PCB POWER
SUPPLY 61.8V,14.5V,80V
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 25.5~27.5KV

15
2.ABNORMAL VIDEO LEVEL ON SCREEN
CHECK 12V RELATIVE
CIRCUIT
OK
NG
OK
NG
NG
OK
OK
CHECK THE VOLTAGE OF IC801
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
CHECK THE VIDEO OUTPUT OF IC801
R.G.B. APPROACH STANDARD
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CONTRAST SET MAX.
OR IC401 PIN 16 OUTPUT
CHECK IC801 PIN 13 ABOUT 4V
PIN 6, 9, 22 ABOUT 12V
CHECK IC801 PIN 15 CLAMP PULSE
PIN 18, 20, 23 ABOUT 4Vpp,
CHECK THE IC105 RELATIVE CIRCUIT
PIN 16 BLANK PULSE
PIN 26, 27, 28 ABOUT 4V OR
CHECK Q801 AND RELATIVE CKT
3. ABNORMAL DDC (PLUG & PLAY)
OK
NG
CHECK IC101 PIN 5 VOLTAGE ABOUT 5V
CHECK SIGNAL CABLE
OR H802 PIN 3, 4 DATA OUTPUT
CHECK Q102 GOOD OR FAIL
16,19,22
7,15.18,21 ABOUT 12V
11
5
1~24

16
6-2 ABNORMAL DISPLAY
1.NO SIGNAL ON SCREEN
CHECK FBT RELATIVE
CIRCUIT
LESS THAN 400V
OK
NG
NG
OK
OK
NG
OK
NG
CHECK THE OUTPUT VOLTAGE
CHECK THE B+ VOLTAGE OF
CHECK THE VOLTAGE OF CRT
CATHODE ABOUT 40Vpp
CHECK THE VOLTAGE OF FBT SCREEN
CHECK THE RELATIVE CIRCUIT
CHECK THE 12V PIN
OF SMPS ON MAIN PCB
RELATIVE CIRCUIT
OF P802 CONNECTOR
ABOUT 400V TO 700V
EXCEED 700V
OF IC801
CHECK FBT & CRT RELATIVE CIRCUIT
OR REFER ITEM 7-1
VIDEO PCB ABOUT 80V
CHECK THE 80V RELATIVE CIRCUIT
CHECK VIDEO IC801 VCC ABOUT 12V
OF IC801 PIN 18, 20, 23 ABOUT 3Vpp
CHECKTHE VQ802 ~ Q807
16,19,22
Check IC803 Pin1,2,3
ABOUT 40V

17
6-3 NO BLANKING
NG
OK
CHECK THE RELATIVE
CIRCUIT OF BLANKING
CHECK THE RELATIVE CIRCUIT
ON MAIN PCB
CHECK G1 RELATIVE CIRCUIT
CHECK IC801 PIN 16 ON VIDEO PCB,
Q705, R718, C707 ON MAIN PCB
OF C433, D410, R635, R636, IC105
6-4 HOR./OSC/DEF/HV CIRCUIT FAULT
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
NG
OK
OK
OK
NG
NG
NG
CHECK THE COLLECTOR VOLTAGE
CHECK THE COLLECTOR VOLTAGE
RELATIVE CIRCUIT
RELATIVE CIRCUIT
CHECK IC401 PIN 26 ~ 31
CHECK Q402, T401
CHECK T401, T402, Q402, Q403,
OF Q402 ABOUT 40Vpp
OF Q403 ABOUT 1100Vpp AT FH:31KHz
D408, C418, C419, H-DY
CHECK IC401 PIN 10 ABOUT 11.5 VDC
CHECK IC401 PIN 8 WAVE FORM
ABOUT 10Vpp
CHECK IC401 PIN 10 RELATIVE CIRCUIT
CHECK IC401 PIN 16 ABOUT
11.5VDC
CHECK IC401 PIN 16
RELATIVE CIRCUIT
CHECK IC401 PIN 17 WAVE
FORM ABOUT 0.7Vpp
CHECK THE COLLECTOR
VOLTAGE OF Q402 ABOUT 18Vpp

18
6-5 ABNORMAL HORIZONTAL DEFLECTION
1. ABNORMAL HORIZONTAL WIDTH OF VIDEO
NG
OK
CHECK THE RELATIVE CIRCUIT
CHECK THE RELATIVE
CIRCUIT OF SMPS.
READJUST H-WIDTH FUNCTION
OF Q404, Q405, & Q406
CHECK THE HV OF
CHECK FBT B+ VOLTAGE
Q911, Q912, Q914, Q915 &
IC401 PIN 4, 5, 6, VR 902
ABOUT 60.5V AT FH=31KHz
CRT ABOUT 26KV
2. ABNORMAL HORIZONTAL RASTER CENTER
P403 AND JUMPER
CHECK T903, D926, D927, R964, R968
3. ABNORMAL HORIZONTAL VIDEO CENTER
CHECK IC101 PIN 9, 10, IC401 PIN 18, 19
4. ABNORMAL HORIZONTAL LINEARITY
CHECK L401, Q407, R447, C448
AND IC101 PIN 20, 21, 22, 23
CS SWITCHER IC403, Q410, Q411, Q420
137V
CHECK L401, Q407, Q407, R447, C448 AND IC101
PIN 20,21,22,23 CS SWITHCHER IC403, Q401,
Q412,Q417
NG
OK

19
6-6 ABNORMAL VERTICAL SCANNING
1. ABNORMAL VERTICAL SIZE
OK
NG
OK
NG
READJUST V-SIZE FUNCTION VALUE
RELATIVE CIRCUIT
CHECK VERT. OSC CIRCUIT
RELATIVE CIRCUIT
NG
CHECK THE IC601 PIN 7 ABOUT 40V
CHECK IC601 PIN 6 OUTPUT ABOUT
38Vpp
CHECK ZD601, ZD602 R626 & SMPS
CHECK IC401 PIN 22, 23, 24
CHECK IC401 PIN 12, 13
2. VERTICAL CENTER
NG
READJUST V-CENTER
CHECK IC101 PIN 9, 10
IC401 PIN 18, 19
6-7 SIDE-PIN CUSHION DISTORTION
NG
READJUST SIDEPIN
CHECK IC401, Q404, Q405, Q406
RELATIVE CKT.
READJUST V-SIZE FUNCTION
VALUE CHECK THE IC601 PIN 6
ABOUT 12V
CHECK D601, R616 & SMPS
RELATIVE CIRCUIT
CHECK IC401 PIN 2,20
CHECK IC601 PIN 6 OUTPUT
ABOUT 45Vpp CHECK IC401 PIN 4
RELATIVE CIRCUIT

20
6-8 POOR FOCUS
READJUST FOCUS CONTROL
NG CHECK FOCUS CONTROL UNIT, FOCUS
LEAD WIRE, CRT SOCKET & CRT
6-9 NO SOUND (FOR AUDIO MODEL ONLY)
OK
OK
OK
OK
NG
ENSURE THE SOUND SOURCE
IS POWER ON
ENSURE THE SOURCE CABLE
CONNECTION
CHECK POWER
CHECK IC501
IC501 FAILURE
SPEAKER FAILURE
OK
SUPPLY CIRCUIT
ADJUST VOLUME CONTROL
NG
CHECK IC501
PIN 14 ABOUT 14V

21
6-10 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60.5V - 145V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B) CONSTANT OUTPUT : 6.3V, 14.5V, 55V, 80V
BEAD SET ABNORMAL VARIABLE OUTPUT
NG
OK
NG
OK
NG
OK
NG NG
NG
OK
OK
OK
NG
OK
NG
YES
NO
CHECK BRIDGE
RECTIFIED CIRCUIT
6.3V CIRCUIT
CHECK START C.K.T
CHECK POWER SAVING
C.K.T(OFF-MODE)
CHECK IC401
CHECK D919
CHECK Q911
Q911 FAILURE
CHECK Q901
CHECK IC901
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901, SW901
CHECK LINE RECTIFIED
& SMOOTHED VOLT
CHECK Q901
IC901 FAILURE
CHECK T901 O/P
MAKE SURE THAT
THE VARIABLE
OK
D909, Q904, R922, R925
CHECK Q912, Q914, Q915
PIN 4, 5, 6, B+ DRIVER
OUTPUT IS NOT SHORTED
VOLTAGE 55V
CHECK THE C934
CHECK 80V, 55V, 14.5V
R923,R924
50V
CHECK START
C.K.T R925, R944
CHECK THE C934
VOLTAGE 47V
CHECK IC401
PIN 11,12,13,14
B+ DRIVER

23
8. PARTS LIST OF CABINET
Location P/N Specification Remark
CMS992X5N CHASSIS FOR S992X-5
1A 503 5T 47 SCREW FOR CRT
5A 38501 RUBBER WASHER
5A600604075S CRT WASHER
5A600605075S CRT WASHER
11A 112 1 A WIRE MOUNTS
11A 112500 WIRE MOUNT
11A 115 1 FBT CLIP
19A 403 7 STEEL
26A 800504 6 BARCODE
33A3663 1 CRT SUPPORT
33A4020 Y A S.C.CAP
33A4071 Y F POWER KNOB
33A4087 Y F KEY PAD
33A6907 1 LENS
★34A 741 Y L BASE
★34A 748 Y 1F BACK COVER
★34A 773 Y L SWIVEL
★34A 809 Y 1F FRONT PAND
40A 153 19 2 CRT WARNING LABEL
40A 154501 1 HI-POT GND LABEL FOR MON
40A 581 26704 FOR CARTON/PALLET
40A 58162410A H/V LABEL
40A2054615 1 ID LABEL
41A 905615 1A MANUAL
44A3224 1 EPS CUSHION
44A3224 2 EPS CUSHION
44A3224624 1A CARTON
45A 76 20 RN PE BAG
45A 76 28 RN PE BAG FOR MANUAL
45A 76 34 RN PE BAG FOR BASE
45A 77500 BARCODE RIBBON
45A 77501 BARCODE RIBBON
50A 500500 CABLE TIE
50A 502 2 PLASTIC TIE
50A 502 5 CABLE TIE
51A 6 4 SILICON
52A 1150 C WHITE TAPE
52A 1185 MIDDLE TAPE FOR CARTON
52A 1185 1 BIG TAPE
52A 1186 SMALL TAPE
71A 100 2 S CORE 8*16*12
85A6020 2 Grounded plate
85A6027500 SHIELD
85A6028500 SHIELD CASE
89A402A18N GL POWER CORD
95A2070517 COPPER BRAID

24
95A8013 2 CONNECTOR
B1A1035 10128 SCREW 3.5X10
D1A1140 7128 SCREW 4X7(FOR AC)
Q1A 340 16128 SCREW
750A1697 76 JK 0.45*90TS DEG COIL
AS1 95A205T 3006A Wire Harness
CA1 95A2070520 COPPER BRAID
Location CMS992X5N CHASSIS FOR S992X-5 Remark
AMS992X5N MAIN BOARD FOR S992X-5
CRS992X5N CRT BOARD FOR S992X-5
1A 421 4128 SCREW
9A 203 9 PIN
11A 141 1 PCB SUPPORT
15A5640 1 A B AL GND LUG
15A5659500 2 Rear Bracket キ
40A 581 26702 FAIL-SAFE LABEL
40A 581624 2A CHASSIS LABEL
52A6016 4 SPRING PIECE
55A 1 4 SOLDER BAR
71A 55 2 A FERRITE BEAD 6.5*5*1.7
71A 55 2 A FERRITE BEAD 6.5*5*1.7
71A 100 9 FERRIRE CORE 28.5*17.5*9
89A174A5DN GL SIGNAL CABLE
B1A1040 10128 SCREW 4*10
B1A1140 6128 SCREW
D1A1140 7128 SCREW 4X7(FOR AC)
M1A1140 6128 SCREW
705A992XC56 01 IC601/IC903 ASS'Y
705A992XC5601A IC901/Q904 ASS'Y
705A992XC5701A Q403 ASS'Y
705A992XC5703A Q420 ASS'Y
705A992XC5704A Q412 ASS'Y
705A992XC87 01 AC IN SOCKET
705A992XC93 02 BD901 ASS'Y
705A992XC9301A D921 ASS'Y
(SW102) 77A 602 1 CJ TACT SWITCH TSVB-2
(SW103) 77A 602 1 CJ TACT SWITCH TSVB-2
(SW104) 77A 602 1 CJ TACT SWITCH TSVB-2
(SW105) 77A 602 1 CJ TACT SWITCH TSVB-2
AA 95A 202 59032 A UL1007#22/WHT SOLID
BB 95A 205 30032 A 95A205-30 L:3"
C103 67A 305471 3T 470UF +-20% 16V
C411 67A 309331 3T 330UF +-20% 16V
C414 67A 305470 9 47UF +-20% 100V
C428 63A210J1227CM 1.2NF/1600V
C431 64A100J225 59 2.2UF/100V MEF
C432 67A 215470 12 47UF +-20% 250V
C458 63A210J1242CC 0.12UF 250V