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SPECIFICATIONS
1. PICTURE TUBE 4. POWER SUPPLY
Size : 17 inch (Flat Square Tube) 4-1. Power Range
Gun : In-line AC 100V ~ 240V (Free Voltage), 50/60Hz, 2.3A Max.
DefIection Angle : 90°
Neck Diameter : 29.1 mm 4-2. Power Consumption
Dot Pitch : 0.27 mm
MODE H/V SYNC POWER CONSUMPTION LED COLOR
2. SIGNAL NORMAL (ON) ON/ON less than 120W GREEN
2-1. Horizontal & Vertical Sync STAND-BY OFF/ON less than 15W
1) Input Voltage Level : Low=0 ~ 0.8V, High=2.5 ~ 5.5V ORANGE
SUSPEND ON/OFF less than 15W
2) Sync Polarity : Positive or Negative
OFF OFF/OFF less than 8W ORANGE
2-2. Video Input SIignal
1) Voltage Level : 0 ~ 0.7 Vp-p 5. DISPLAY AREA
a) Color 0, 0 : 0 Vp-p 5-1. Active Video Area :
b) Color 7, 0 : 0.467 Vp-p · Max Image Size - 325.4 x 244.1mm (12.91" x 9.61")
c) Color 15, 0 : 0.7 Vp-p · Preset Image Size - 310 x 230 mm (12.20" x 9.06")
2) Input Impedance : 75 5-2. Display Color : Full Colors
3) Video Color : R, G, B Analog 5-3. Display Resolution : 1024 Dots x 768 Lines / 85Hz
4) Signal Format : Refer to the Timing Chart 1280 Dots x 1024 Lines / 60Hz
5-4. Video Bandwidth : 110 MHz
2-3. Signal Connector
15 Pin D-Sub Connector 6. ENVIRONMENT
6-1. Operating Temperature: 15°C ~ 30°C (59°F ~ 86°F)
2-4. Operating Frequency (Ambient)
Horizontal : 30 ~ 70 kHz 6-2. Relative Humidity : 8% ~ 80%
Vertical : 50 ~ 160 Hz (Non-condensing)
6-3. Altitude : 5,000m
3. STEREO AUDIO
3-1. Input Voltage : 0.707 Vrms 7. DIMENSIONS (With TILT/SWIVEL)
3-2. Input Impedance : 20k min Width : 465.0 mm (18.31")
3-3. Amp Output : 2W+2W rms Depth : 442.0 mm (17.40")
3-4. Speaker Impedance : 4 Height : 435.5 mm (17.15")
3-5. Speaker Type : Dome, Bassreflex, Closed
8. WEIGHT (WithTILT/SWIVEL)
Net. Weight : 17.4 kg (38.37 lbs)
Gross Weight : 21.0 kg (46.30 lbs)
.
-2-
TIMING CHART
VIDEO
B A
C E
F
D
SYNC
FACTORY PRESET MODE
MODE
MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9 MODE 10
Sync Polarity -- + + + -- -- -- -- -- +
H
O Frequency kHz 37.50 46.88 53.68 68.677 31.47 31.47 37.927 43.27 41.775 60.02
R
I
Total Period µs E 26.67 21.33 18.63 14.561 31.782 31.78 26.366 23.11 23.938 16.66
Z Video Active Time µs A 20.32 16.16 14.22 10.836 25.422 25.42 20.282 17.78 18.238 13.00
O
N
Blanking Time µs B 6.35 5.17 4.41 3.725 6.36 6.36 6.085 5.33 5.7 3.66
T Front Porch µs C 0.51 0.32 0.57 0.508 0.636 0.64 1.014 0.89 0.228 0.20
A
L
Sync Duration µs D 2.03 1.62 1.14 1.016 3.813 3.81 3.042 1.33 2.052 1.22
Back Porch µs F 3.81 3.23 2.70 2.201 1.907 1.91 2.028 3.11 3.42 2.24
Sync Polarity -- + + + + -- + -- -- +
V Frequency Hz 74.99 75.01 85.07 85.00 70.08 59.94 85.039 85.01 75 75.03
E
Total Period ms E 13.335 13.331 11.755 11.764 14.27 16.684 11.759 11.763 13.333 13.328
R
T Video Active Time ms A 12.802 12.798 11.178 11.182 13.158 15.254 10.564 11.093 12.663 12.795
I
Blanking Time ms B 0.533 0.533 0.577 0.582 1.112 1.430 1.213 0.670 0.670 0.533
C
A Front Porch ms C 0.026 0.021 0.018 0.014 0.191 0.318 0.026 0.023 0.024 0.017
L
Sync Duration ms D 0.080 0.064 0.056 0.044 0.064 0.063 1.107 0.069 0.551 0.050
Back Porch ms F 0.427 0.448 0.503 0.524 0.858 1.049 0.079 0.578 0.096 0.466
640 800 800 1024 720 640 720 640 960 1024
Resolution x x x x x x x x x x
480 600 600 768 400 480 400 480 529 768
75Hz 75Hz 85Hz 85Hz 70Hz 60Hz 85Hz 85Hz 75Hz 75Hz
Recall Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
-4-
CONTROL LOCATIONS
6
4 5
SW202
VR201 VR202
SW206 SW205
SW201 2 3
SW204 SW203
1
CONTROL 7 8
SPEAKER
SPEAKER
MAIN MIC JACK
9
EARPHONE JACK
VR701
10
VR901
FBT
AUDIO
MIC OUT AUDIO IN
VIDEO
No. Ref. No. Control Function No. Ref. No. Control Function
1 SW201 POWER SWITCH 6 SW202 ENTER BUTTON
2 VR201 CONTRAST CONTROL 7 SW204 OSD SELECT RIGHT
3 VR202 BRIGHTNESS CONTROL 8 SW203 OSD SELECT LEFT
4 SW206 SOUND MUTE 9 VR701 H/V ADJUSTMENT
5 SW205 SOUND 10 VR901 B+ ADJUSTMENT
- 10 -
WIRING DIAGRAM
P201 MIC P202
P405
P804
P803
P801
P403
P802
P501
WG2 P904
P702
SPEAKER SPEAKER
P2 P4 P3 S+
S
TH901
P402
P703
P1 P701
AC Socket P704 P805
Signal Cable
P302 P301
P304
P303
- 11 -
DISASSEMBLY
1. TILT/SWIVEL REMOVAL 3. TOTAL CHASSIS ASSEMBLY REMOVAL
1) Set the monitor face down. 1) Disconnect P901 (Degaussing pin), P701
2) Pressing the latch (a), carefully remove the (H-DY pin), and P601(V-DY pin).
Tilt/Swivel by pulling it upward. 2) Remove two screws (a) from the Main Bracket
to separate it from the Front Cabinet.
(a)
(a)
(a)
2. BACK COVER REMOVAL 4. CRT BOARD ASSEMBLY REMOVAL
1) Remove four screws (a) from the Back Cover. 1) Remove three pins (a).
2) Slide the Back Cover away from the Front 2) Remove the CRT ground connector (b).
Cabinet of the monitor. 3) Carefully separate the CRT Board Assembly
from the CRT neck.
(a) 4) Discharge the remaining static electricity by
shorting between the Anode Cap and the CRT
ground.
5) Disconnect the Anode Cap from the CRT.
Anode Cap (a)
(a)
(b)
- 12 -
5. BOTTOM BRACKET REMOVAL 6. MAIN BOARD ASSEMBLY REMOVAL
1) Remove eight screws (a). 1) Remove ten screws (a).
2) Remove the Bottom Bracket. 2) Remove three screws (b).
3) Release two latches (c) from the Main Board
Assembly.
(b)
(a)
(a) (a)
(a)
(a)
(a) (c)
Bottom Bracket
(a) (c)
- 13 -
< Front Control > H.V
Heater ( 6.3V )
POWER Signal
H-Sync Sig R
Cable
V-Sync Sig G VIDEO VIDEO
C-MIC DY CDT
B PRE-AMP MAIN AMP
I2C DATA(SDA)
SELECT RIGHT
(IC302) (IC303)
H/V POSITION LEFT
I2C CLOCK(SCL)
H/V SIZE BRIGHTNESS
G1
8V
SPPC CONTRAST
TRAPIZODE AUDIO CONTROL MICOM 125V
OSD IC 8V REG. CUT OFF
Screen
PIN BALANCE VOLUME 5V 8V
PARALLELOGRAM TREBLE
(IC401) (IC303) I2C (IC304) CONTROL
TILT BASS
MOIRE BALANCE I2C 12V
VIDEO LEVEL MICROPHONE R/G/B R/G/B
COLOR CONTROL AUDIO MUTE 5V Contrast Bias
DEGAUSSING
OSD CONTROL
Static Focus
15V
Dynamic Focus
RECALL SCL / SDA
LANGUAGE
INFORMATION H/V Sync, X-RAY
EXIT PWM Control 12V Protection
Vertical Blanking,
Sig Circuit
E2PROM I2C Brightness Control
(IC402)
6.3V 15V
H/V Sync Processor - 120V
TILT 15V ( IC701 )
Control TDA4856 V-OUT
TILT
COIL
I2C 40V
Circuit ( IC601) 30V
TDA4866
- 14 -
Degaussing H/V
Circuit 6.3V Sync FBT
160V ( T701 )
COIL
125V H-OUT
70V ( Q706)
DEGAUSSING
BLOCK DIAGRAM
15V H-DRV B+
SMPS 6.3V
TRANS 12V 12V
Line (T901) 6.3V H-Linearity
Filter 5V Correction
Dynamic Auto
15V Focus Beam
Circuit Limit
DC/DC Converter
B-DRV
SMPS 160V
POWER INPUT CONTROL
100~240VAC (IC901) D/D Feed Back
(50/60Hz)
I2C
DPM SOUND
VOLTAGE 15V REGULATOR 9V AUDIO PRE-AMP AUDIO AMP
CONTROL SPEAKER
FEEDBACK (Q1) (IC1) (IC2)
CIRCUIT
AUDIO IN
MIC OUT TO PC
DESCRIPTION OF BLOCK DIAGRAM
1. Line Filter & Associated Circuit. 5) User can adjust screen condition by each OSD
This is used for suppressing noise of power input line function. The data of the adjusted condition is
flowing into the monitor and/or some noise generated stored in EEPROM(IC402).
in this monitor flowing out through the power input line. 6) Users can control screen condition by the OSD,
That is to say, this circuit prevents interference Select, Right, Left, Audio, Audio Mute buttons, and
between the monitor and other electric appliances. Brightness, Contrast volume.
2. Degauss Circuit & Coil. 6. Horizontal and Vertical Oscillation.
The degauss circuit consists of the degaussing coil, This circuit generates the horizontal pulse and the
the PTC(Positive Temperature Coefficient) vertical pulse by taking the H and V sync signal.
thermistor(TH901), and the relay(RL901). This circuit This circuit consists of the TDA4856(IC701) and the
eliminates abnormal color of the screen automatically associated circuit.
by degaussing the shadow mask in the CRT during
turning on the power switch. When you need to 7. Oscillating Circuit for D/D Converter.
degauss in using the monitor, select DEGAUSS on the This circuit generates the saw-tooth wave which has
OSD menu. the horizontal period by taking output of the
TDA4856(IC701).
3. SMPS(Switching Mode Power Supply).
This circuit is working of 90~264V AC(50/60Hz). 8. D/D(DC to DC) Converter.
The operation procedure is as follows: This circuit supplies DC voltage to the horizontal
1) AC input voltage is rectified and smoothed by the deflection output circuit by decreasing DC 160V which
bridge diodes (D901~D904) and the capacitor is the secondary voltage of the SMPS in accordance
(C907). with the input horizontal sync signal.
2) The rectified voltage(DC) is applied to the primary
coil of the transformer(T901). 9. Side-Pincushion & Trapezoid Correction Cirucit.
3) The control IC(IC901) generates switching pulse to This circuit improves the side-pincushion and the
turn on and off the primary coil of the transformer trapezoid distortion of the screen by mixing parabola
(T901) repeatedly. and saw-tooth wave to output of the horizontal
4) Depending on turn ratio of the transformer, the deflection D/D converter which is used for the supply
secondary voltages appear at the secondary coils voltage(B+) of the deflection circuit.
of the transformer(T901).
5) These secondary voltages are rectified by each 10. Horizontal Deflection Output Circuit.
diode(D902, D922~D924, D926, D927) and This circuit makes the horizontal deflection by
operate other circuit. (horizontal and vertical supplying the saw-tooth current to the horizontal
deflection, video amplifier, sound, ...etc.) deflection yoke.
4. X-ray Protection. 11. High Voltage Output & FBT(Flyback Transformer).
If the high voltage of the FBT reaches up to 29kV The high voltage output circuit is used for generating
(abnormal state), Q807 operates and IC401(MICOM) pin pulse to the primary coil of the FBT(Flyback
11 come to low level. Then MICOM control IC701 Transformer (T701)). A boosted voltage(about 26kV)
(Deflection controller) to stop Horizontal drive pulse and appears at the secondary of the FBT and it is supplied
stop Horizontal Deflection. to the anode, focus, and screen voltage of the CRT.
5. Micom(Microprocessor) Circuit. 12. H-Linearity Correction Circuit.
The operating procedure of Micom(Microprocessor) This circuit corrects the horizontal linearity for each
and its associated circuit is as follows: horizontal sync frequency.
1) H and V sync signal is supplied from the signal
cable. 13. Vertical Output Circuit.
2) The Micom(IC401) distinguishes polarity and This circuit takes the vertical ramp wave from the
frequency of H and V sync. TDA4856(IC701) and performs the vertical deflection
3) The Micom sets operating mode and offers the by supplying the saw-tooth current to the vertical
controlled data. (H-size, H-position, V-size, ... etc.) deflection yoke.
4) The controlled data of each mode is stored in itself.
- 15 -
14. Dynamic Focus Output Circuit. 17. Image Rotation (Tilt) Circuit.
This circuit takes the horizontal and the vertical This circuit corrects the tilt of the screen by supplying
parabola waves from the TDA4856(IC701) and the image rotation signal to the tilt coil which is
amplifies it to maintain constant focus on center and attached near the deflection yoke of the CRT.
corners in the screen.
18. Video Pre-Amp Circuit.
15. Audio Circuit This circuit amplifies the analog video signal from 0-
MIC circuit sends the microphone sound to PC. 0.7V to 0-4V. It is operated by taking the clamp, R, G,
The sound circuit get to the audio gain with the B drive and contrast signal from the Micom(IC401).
pre-amp (IC1) and the main amp (IC2).
19. Video Output Amp Circuit.
16. H & V Blanking and Brightness Control. This circuit amplifies the video signal which comes
Blanking circuit eliminates retrace line by supplying from the video pre-amp circuit and amplified it to
negative pulse to the G1 of the CRT. And Brightness applied the CRT cathode.
circuit is used for control of the screen brightness by
changing DC level of the G1.
- 16 -
EXPLODED VIEW
EXPLODED VIEW PARTS LIST
Ref. No. Part No. Description Q'ty Material *Remark
1 3091TKC018J CABINET ASS'Y 1 LGC ABS AF303G UL94-5V L
1-1 3551TKS012G COVER ASS'Y, GRILLE (R/L) 1 LGC ABS AF303S UL94-0V L
1-2 332-102D SCREW, PTP+4x14 (MSWR/FZMY) 2
2 2423GC0B89Z CDT, M41LFQ803x46NLAA 1 L
3 339-002H SCREW, PHP+5x20+GW18 4
4 6868T17003C CDT EARTH 1
5 6140TC3001A DEGAUSSING COIL 1 L
6 6174Z-1012B FBT 1 AL (t=2.0)
7 6200TJB001D FILTER, AC SOCKET 1 AL (t=2.0)
8 6871TST124H PCB ASS'Y, (CONTROL) SUB TOTAL 1 L
9 4810TKK059B BRACKET, SIGNAL 1
10 4940TKC003E KNOB, CONTROL ROTARY 2 LGC ABS AF303S UL94-V0
11 4810TKV003C BRACKET, VOLUME 1 LGC ABS AF303S UL94-V0
12 4810TKM004D BRACKET, MAIN 1 LGC ABS AF303S UL94-V0
13 6871TST126H PCB ASS'Y, AUDIO 1
14 340-714C BRACKET, BOTTOM SHELD 1 SBHG1-A (t=1.0)
15 332-102F SCREW, PTP+4x20 2
16 3809TKC001R BACK COVER ASS'Y 1 LGC ABS AF303G UL94-5V L
17-1 332-102H SCREW, PTP+4x40 2
17-2 332-102F SCREW, PTP+4x20 2
18 3043TKK004L TILT SWIVEL ASS'Y 1 LGC HIPS 60HR UL94-HB L
19 6401TZZ013C SPEAKER ASS'Y (LEFT) 1
20 6401TZZ013D SPEAKER ASS'Y (RIGHT) 1
A 6871TMT121L PCB ASS'Y, MAIN TOTAL 1
B 6871TVT116J PCB ASS'Y, VIDEO TOTAL 1
C 3141TZZ045P CHASSIS ASS'Y, MAIN TOTAL 1
* Remark `L' are local sourcing parts in China factory of the LG Electronics Inc.
ADJUSTMENT
GENERAL INFORMATION
All adjustment are thoroughly checked and corrected 8) DIST. ADJ. FOS. ADJ Mode No. 1 command.
when the monitor leaves the factory, but sometimes 9) Adjust V-SIZE as arrow keys to 230±2mm.
several minor adjustment may be required. 10) Adjust V-POSITION as arrow keys to center of the
Adjustment should be following procedure and after
screen.
warming up for a minimum of 30 minutes.
11) Adjust H-SIZE as arrow keys to 310±2mm.
12) Adjust H-POSITION as arrow keys to center of the
· Alignment appliances and tools.
- IBM compatible PC. screen.
- Programmable Signal Generator. 13) Adjust S-PCC (Side-Pincushion) as arrow keys to
(eg. VG-819 made by Astrodesign Co.) be the best condition.
- E(E)PROM with each mode data saved. 14) Adjust TRAPEZOID as arrow keys to be the best
- Alignment Adaptor and Software. condition.
- Digital Voltmeter. 15) Display from Mode 2 to Mode 7 and repeat above
- White Balance Meter. from number 9) to 14).
- Luminance Meter. 16) PRESET EXIT Y(Yes) command.
- High-voltage Meter.
6. Adjustment for White Balance and Luminance.
AUTOMATIC AND MANUAL DEGAUSSING 1) Set the White Balance Meter.
The degaussing coil is mounted around the CRT so that 2) Press the (DEGAUSSING) on the OSD menu for
automatic degaussing when turn on the monitor. But a demagnetization of the CRT.
monitor is moved or faced in a different direction, become 3) Display color 0,0 pattern at Mode 4.
poor color purity cause of CRT magnetized, then press 4) COLOR ADJ. LUMINANCE command of the
(DEGAUSSING) on the OSD menu. alignment program.
5) Set Brightness and Sub-Brightness to max position.
ADJUSTMENT PROCEDURE & METHOD 6) COLOR ADJ. BIAS ADJ. COLOR NO. 1
- Install the cable for adjustment such as Figure 1 and run command of the alignment program.
the alignment program on the DOS for IBM compatible PC. 7) Check whether blue color or not at R-BIAS and G-
- Set external Brightness and Contrast volume to max position. BIAS to min position and adjust B-BIAS to
0.3±0.05FL of the raster luminance.
1. Adjustment for B+ Voltage.
8) Adjust R-BIAS and G-BIAS command to x=0.283±
1) Display cross hatch pattern at Mode 4.
0.01 and y=0.298±0.01 on the White Balance Meter
2) Adjust C951 + voltage to 160±0.5Vdc with VR901.
with PC arrow keys.
9) Adjust SUB-BRIGHT command to 0.4±0.1FL of the
2. Adjustment for High-Voltage.
raster luminance.
1) Display cross hatch pattern at Mode 4.
10) Display color 15,0 box pattern (70x70mm) at Mode 4.
2) Adjust FBT B+ voltage to 141± 0.5Vdc with
11) DRIVE ADJ No 1. command.
VR701. 12) Set Contrast and Sub-Contrast to max position.
13) Set B-DRIVE to 2/3 150(96 decimal) position at
5. Adjustment for Factory Mode (Preset Mode).
DRIVE of the alignment program.
1) Display cross hatch pattern at Mode 1.
14) Adjust R-DRIVE and G-DRIVE command to white
2) Run alignment program for E74M on the IBM balance x=0.283±0.003 and y=0.298±0.003 on the
compatible PC. White Balance Meter with PC arrow keys.
3) COMMAND START Y(Yes) command. 15) Adjust Sub-Contrast command to 54±2FL of the
4) DIST. ADJ. TILT command. raster luminance.
5) Adjust tilt as arrow keys to be the best condition. 16) Save in COLOR 1.
6) DIST. ADJ. BALANCE command.
7) Adjust balance of side-pincushion as arrow keys to
be the best condition.
- 17 -
17) Display color 15,0 full white patten at Mode 4. 7. Adjustment for Focus.
18) COLOR ADJ. LUMINANCE ABL command. 1) Display H character in full screen at Mode 4.
19) Adjust ABL to 35±1FL of the luminance. 2) Adjust two Focus control on the FBT that focus
20) Exit from the program. should be the best condition.
* Note : Color mode 2 data is automatically save in
the EEPROM by the microprocessor.
Monitor to be
adjusted
IBM
Compatible PC
VIDEO
SIGNAL GENERATOR PARALLEL PORT
d
se
tu
2C
No
23
RS
EL
Control Line
LL
C
RA
PA
Power inlet (required)
220
Power Select Switch
R
VG
WE
S
(110V/220V)
PO
A A
T
MO Power LED
CS
NI
YN
TO
V-S
R
9 6
E ST Switch 5 1
B 15 11
10 6
5 1
C
F V-Sync On/Off Switch
(Switch must be ON.) 13 1
25 14
OFF ON
5V
F
5V
4.7K
ON 5V 4.7K
E 74LS06
OFF 4.7K
74LS06
B
Figure 1. Cable Connection
- 18 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK NO TROUBLE IN FUSE
FUSE OK? (F901)
YES
CHECK
C907 VOLTAGE? NO TROUBLE IN
(AC120V: 170VDC, D901, D902, D903, D904
AC220V: 310VDC)
YES
CHECK
IC901 PIN 3
WAVEFORM NO TROUBLE IN
(SQUARE WAVE IC901, IC902
COMES OUT?)
YES
CHECK
NO TROUBLE IN
D920, D922, D924,
D920, D922, D923,
D923, D926
D924, D926
VOLTAGE?
YES
TROUBLE IN
IC923, IC925, Q922,
Q923, Q924, Q926
- 19 -
2. NO CHARACTER
NO CHARACTER
CHECK
NO TROUBLE IN
IC302 PIN 7, 15, 18,
P302 12V LINE, IC304
21(8V) ?
YES
CHECK TROUBLE IN
NO
IC302 PIN 6, 8, 10 ? PC SIGNAL,
P301 SIGNAL CABLE
YES
CHECK NO TROUBLE IN
IC302 PIN 16, 19, 22 ? IC302
YES
CHECK
NO TROUBLE IN
IC303 PIN 6 (70V)
10 (12V) ? P302 12V LINE/70V LINE
YES
CHECK
IC303 NO TROUBLE IN IC303
PIN 1, 3, 5 ?
YES
CHECK TROUBLE IN
NO R338~R341,
R, G, B CATHODE
VOLTAGE? R344, R345, L302~L304,
D307~D310, D312, D313
YES
TROUBLE IN
CRT SOCKET
- 20 -
3. NO RASTER
NO VIDEO
(POWER INDICATOR ON)
CHECK
POWER INDICATOR ORANGE DPM MODE
GREEN or ORANGE? (NO H and/or V SYNC)
GREEN
CHECK NO TROUBLE IN
D712 ANODE
D712
(-120V)?
YES
CHECK
G1 VOLTAGE? NO TROUBLE IN
( 10~20V) Q801~Q806
YES
TROUBLE IN
D926, Q925 (6.3V)
- 21 -
4. NO HORIZONTAL DEFLECTION
NO H-DEFLECTION
(ONE VERTICAL LINE)
CHECK NO TROUBLE IN
Q706? Q706
YES
CHECK
NO TROUBLE IN
B+ VOLTAGE
(160V)? 160V LINE
YES
CHECK
T701(FBT) PIN 3 NO TROUBLE IN
(31KHZ 70V, Q717, Q718, Q719,
69KHZ 140V) ? D707
YES
CHECK
NO TROUBLE IN
Q705 COLLECTOR
Q705
WAVEFORM?
YES
TROUBLE IN
T701, P701
- 22 -
5. TROUBLE IN H-LINEARITY
UNBALANCED OF H-LIN.
CHECK
IC401 NO TROUBLE IN
PIN 18, 19, 20? IC401 (MICOM)
YES
CHECK NO TROUBLE IN
Q711~Q716? Q711 ~ Q716
YES
CHECK NO TROUBLE IN
L703? L703
YES
Cs SIGNAL TABLE
HORIZONTAK
FREQUENCY(fH) Cs0 Cs1 Cs2
TROUBLE IN
30K ~ 39K L L L
L720, R744
39K ~ 47.5K L L H
47.5K ~ 62K L H H
62K ~ 70K H H H
- 23 -
6. NO VERTICAL DEFLECTION
NO V-DEFLECTION
(ONE HORIZONTAL LINE)
CHECK NO TROUBLE IN
IC601 PIN 3
R603, Q601~Q603,
(15V)?
15V LINE
YES
CHECK NO TROUBLE IN
IC601 PIN 7 HIGH-VOLTAGE OUT
(40V)? CIRCUIT, D713
YES
CHECK NO TROUBLE IN
IC701 PIN 12, 13? IC701
3V
YES
TROUBLE IN
IC601, V-CIRCUIT
- 24 -
7. TROUBLE IN OSD
NO OSD (ENTER BUTTON MUST BE PRESSED.)
CHECK NO TROUBLE IN
IC301 B+ ? 5V LINE
DC 5V
YES
CHECK TROUBLE IN
IC301 PIN 5, 10 NO
IC601 PIN8 (V-FBP),
WAVEFORM? T701 40V LINE
Pin 10
5V
Pin 5 YES
CHECK
IC311 PIN 12 NO TROUBLE IN
WAVEFORM ? IC302, IC301
H+V
5V
YES
CHECK NO TROUBLE IN
IC311 PIN 13, 14, 15 ? IC301, IC302
H+V
5V
YES
TROUBLE IN
OSD PERIPHERAL
CIRCUIT
- 25 -
8. TROUBLE IN DPM
OFF MODE FAILURE (NO OFF MODE.)
CHECK
IC401 (MICOM) CHECK PC,
INPUT H/V SYNC SIGNAL
PIN 1, 42 (H/V INPUT) (PC IS NOT GOING INTO
SIGNAL? DPM OFF MODE)
NO H/V SYNC
CHECK
IC401 PIN 6 NO TROUBLE IN
WAVEFORM? X401
5V
YES
6MHz
CHECK
NO (DPMF: 0V) TROUBLE IN
IC401 (MICOM)
IC401 (MICOM)
PIN 9, 12 ?
SEE DPM TABLE
YES
CHECK NO
B+ LINE TROUBLE IN
(6.3V,15V) ? Q922, Q923, Q925, Q926
YES DPM TABLE
Item DPMS DPMF LED
Mode
TROUBLE IN PC NORMAL H H GREEN
STAND-BY H L ORANGE
SUSPEND H L ORANGE
OFF L L ORANGE
- 26 -
9. NO DEGAUSSING
NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.)
CHECK NO TROUBLE IN
IC401 PIN 22
IC401 (MICOM)
(0V)?
YES
CHECK
NO TROUBLE IN
Q921 COLLECTOR
Q921
VOLTAGE?
DC 5V
YES
CHECK NO TROUBLE IN
P902, P903? P902, P903
YES
CHECK NO TROUBLE IN
RL901? RL901
YES
TROUBLE IN
TH902,
DEGAUSSING COIL
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10. NO TILT (NO ROTATION )
NO TILT (NO ROTATION)
CHECK
Q504 NO TROUBLE IN
WAVE FORM ? IC401 (MICOM)
YES
CHECK
15V LINE NO TROUBLE IN
AND 6.3V LINE ? 15V LINE, 6.3V LINE
YES
CHECK
Q503 EMITTER NO TROUBLE IN
VOLTAGE ? Q501~Q503
YES
TROUBLE IN
P501, TILT COIL
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11. TROUBLE IN AUDIO
NO AUDIO (INPUT WAVEFORM ; 2Vp-p )
(NO SOUND)
CHECK
IC1 PIN 7, 8 NO TROUBLE IN
(AUDIO SIGNAL) ? JA804, P1
YES
NO
CHECK TROUBLE IN
IC2 PIN 2, 10 ? IC1
YES
TROUBLE IN
SPEAKER, P3, P4,
P801, P802, JA802
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