Page 1
TROUBLESHOOTING GUIDE
- 16 -
NO POWER
(POWER INDICATOR OFF)
TROUBLE IN
D901, D902, D903, D904
TROUBLE IN FUSE
(F901)
TROUBLE IN
IC901, IC902
TROUBLE IN
D930, D922, D923,
D924, D926
TROUBLE IN
IC903, Q920, Q922,
Q923, Q924, Q925, Q926
CHECK
FUSE OK?
CHECK
C907 VOLTAGE?
(AC120V: 170VDC,
AC220V: 310VDC)
NO
YES
YES
YES
YES
NO
NO
NO
CHECK
IC901 PIN 3
WAVEFORM
(SQUARE WAVE
COMES OUT?)
CHECK
D930, D922, D924,
D923, D926
VOLTAGE?
1. NO POWER
Page 2
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2. NO CHARACTER
NO CHARACTER
CHECK
IC302 PIN 7, 15, 18,
21(8V) ?
CHECK
IC302 PIN 6, 8, 10 ?
CHECK
IC302 PIN 16, 19, 22 ?
CHECK
IC303
PIN 1, 3, 5 ?
CHECK
IC303 PIN 6 (75V)
10 (15V) ?
TROUBLE IN
P302 15V LINE, IC304
TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE
TROUBLE IN
IC302
TROUBLE IN
P302 15V LINE/75V LINE
TROUBLE IN IC303
NO
YES
NO
NO
YES
YES
YES
YES
NO
NO
CHECK
R, G, B CATHODE
VOLTAGE?
TROUBLE IN
R338~R341,
R344, R345, L302~L304,
D307~D310, D312, D313
TROUBLE IN
CDT SOCKET
YES
NO
Page 3
- 18 -
NO VIDEO
(POWER INDICATOR ON)
CHECK
POWER INDICATOR
GREEN or ORANGE?
CHECK
D712 ANODE
(-120V)?
CHECK
G1VOLTAGE?
(-10 ~ -30V)
TROUBLE IN
D712
TROUBLE IN
D926, Q925 (6.3V)
TROUBLE IN
Q801~Q806, Q808
DPM MODE
(NO H and/or V SYNC)
ORANGE
NO
GREEN
YES
YES
NO
3. NO RASTER
Page 4
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4. NO HORIZONTAL DEFLECTION
NO H-DEFLECTION
CHECK
Q706?
(H-OUT TR)
CHECK
B+ VOLTAGE
(194V)?
CHECK
T701(FBT) PIN 2
(31KHZ 60V,
69KHZ 160V) ?
CHECK
Q705 COLLECTOR
WAVEFORM?
TROUBLE IN
Q706
TROUBLE IN
194V LINE
TROUBLE IN
Q717, Q718, Q719,
D707
TROUBLE IN
Q705
TROUBLE IN
T701, P701
NO
NO
YES
YES
YES
YES
NO
NO
Page 5
- 20 -
5. TROUBLE IN H-LINEARITY
UNBALANCED OF H-LIN.
CHECK
IC401
PIN 18, 19, 20?
CHECK
Q711~Q716?
CHECK
L703?
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q711 ~ Q716
TROUBLE IN
L703
TROUBLE IN
C720, R744
NO
NO
NO
YES
YES
YES
Cs SIGNAL TABLE
HORIZONTAK
FREQUENCY(fH)
30K ~ 36K
37K ~ 44K
45K ~ 57K
58K ~ 70K
Cs0
L
L
L
H
Cs1
L
L
H
H
Cs2
L
H
H
H
Page 6
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6. NO VERTICAL DEFLECTION
NO V-DEFLECTION
(ONE HORIZONTAL LINE)
CHECK
IC601 PIN 3
(15V)?
CHECK
IC601 PIN 7
(40V)?
CHECK
IC701 PIN 12, 13?
TROUBLE IN
R603, Q601~Q603,
15V LINE
TROUBLE IN
HIGH-VOLTAGE OUT
CIRCUIT, D713
TROUBLE IN
IC701
TROUBLE IN
IC601, V-CIRCUIT
NO
NO
YES
YES
YES
NO
3V
Page 7
- 22 -
TROUBLE IN
OSD PERIPHERAL
CIRCUIT
NO OSD
TROUBLE IN
5V LINE
TROUBLE IN
IC601 PIN8 (V-FBP),
T701 40V LINE
TROUBLE IN
IC302, IC301
TROUBLE IN
IC301, IC302
NO
YES
DC 5V
YES
YES
YES
NO
NO
NO
Pin 5
5V
Pin 10
5V
H+V
5V
H+V
CHECK
IC301 B
+
?
CHECK
IC301 PIN 12
WAVEFORM ?
(ENTER BUTTON MUST BE PRESSED.)
7. TROUBLE IN OSD
CHECK
IC301 PIN 5, 10
WAVEFORM?
CHECK
IC301 PIN 13, 14, 15 ?
Page 8
- 23 -
CHECK
IC401 (MICOM)
PIN 1, 42 (H/V INPUT)
SIGNAL?
CHECK
IC401 PIN 6
WAVEFORM?
CHECK
IC401 (MICOM)
PIN 9, 12 ?
CHECK
B+LINE
(6.3V,15V) ?
CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)
TROUBLE IN
X401
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q922, Q923, Q925, Q926
TROUBLE IN PC
OFF MODE FAILURE
INPUT H/V SYNC SIGNAL
NO H/V SYNC
(NO OFF MODE.)
NO
NO
NO (DPMF: 0V)
DPM TABLE
Mode
Item
NORMAL
STAND-BY
SUSPEND
OFF
DPMS
H
H
H
L
LED
GREEN
ORANGE
ORANGE
ORANGE
DPMF
H
L
L
L
YES
SEE DPM TABLE
YES
YES
5V
6MHz
8. TROUBLE IN DPM
Page 9
- 24 -
CHECK
IC401 PIN 22
(0V)?
CHECK
Q921 COLLECTOR
VOLTAGE?
CHECK
P902 ?
CHECK
RL901?
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q921
TROUBLE IN
P902
TROUBLE IN
RL901
TROUBLE IN
TH901,
DEGAUSSING COIL
NO DEGAUSSING
DC 5V
NO
NO
NO
NO
YES
YES
YES
YES
(DEGAUSS ON THE OSD MENU MUST BE PRESSED.)
9. NO DEGAUSSING
Page 10
- 25 -
10. NO TILT (NO ROTATION)
NO TILT (NO ROTATION)
TROUBLE IN
IC401 (
MICOM)
TROUBLE IN
15V LINE, 6.3V LINE
TROUBLE IN
Q501~Q503
TROUBLE IN
P501, TILT COIL
NO
YES
YES
YES
CHECK
15V LINE
AND 6.3V LINE ?
CHECK
Q503 EMITTER
VOLTAGE ?
(0.7~12V)
NO
NO
CHECK
Q504
WAVE FORM ?
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