Page 1
CKF5607L 7-1
7 Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit,Horizontal output circuit, H/V control circuit, and H/V output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
7-1 No Power
Check Fuse, D600, D602, D603
and D604.
Does proper AC 90-264 Volts
appear between the positive and
negative poles of C606?
Yes
No
Check D608, D609, D610, D611,
D612 and T601.
PWM output appear at Pin 5
of T601?
Yes
No
Check T602 and D608.
Check Power protection.
Check IC602.
AFC Signal appear at
negative pole of C612?
Yes
No
Check D615.
Check IC602.
H-Sync Pulse appear at Pin
5 of IC602?
Yes
No
VCC appear at Pin 3 of IC602?
Yes
No
WAVEFORMS
3
4
472V (T601 #5)
CH1 P-P = 472 V CH1 RMS = 372.2 V
3
3.44 V (C612, –)
CH1 P-P = 3.44 V CH1 RMS = 620 mV
4
Page 2
7 Troubleshooting
7-2 CKF5607L
7-3 Vertical Line on CRT (Root Cause : Horizontal Deflection Parts Fail)
Check 5V,
12V Line.
Check IC401.
Does PWM output signal appear
at Pin 26 (H-out) of IC401?
Yes
No
Does DC 5 V appear at Pin 32
of IC401?
Yes
No
Check Q403 and Q404.
Check Q405.
Does 12Vp-p signal appear at
Emitters of Q403 and Q404?
Yes
No
No
Check CN401, CN402, D409
and Q410
Does 120Vp-p signal appear at
Pin 1 of T401?
Yes
Check swap IC300.
Check connector CN300 and CN301.
Check CN300 and CN301.
Check DC 13 V Line.
7-2 Horizontal Line on CRT (Root Cause : Vertical Deflection Parts Fail)
Does output pulse of 50Vp-p
appear at Pin 5 of IC301?
Does rectangular signal output
at Pin 5 of IC300?
Yes
No
No
Does DC 13 V appear at Pin 2
of IC300?
Yes
Yes
No
Check DC –12 V Line.
Does DC -12 V appear at Pin 4 of
IC300?
Yes
No
WAVEFORMS
18
6
11
WAVEFORMS
43.0 V (IC300 #5)
CH1 P-P = 43.0 V CH1 RMS = 5.34 V
18
9.24 V (IC401, #26)
CH1 P-P = 9.24 V CH1 RMS = 6.048 V
6
93.6 V (T401, #1)
CH1 P-P = 93.6 V CH1 RMS = 55.2 V
11
Page 3
7 Troubleshooting
CKF5607L 7-3
Check Q512, D511, D508 and FBT.
Check Power parts.
Check protection case.
Check Q403 and Q404.
Does secondary voltage
appear at D608, D609, D610,
D611 and D612?
Does DC 12 V appear at Pin 2 of
IC603?
Check IC600
and IC603.
Check IC401.
Does H-out signal appear at Pin
26 of IC401?
7-4 No Raster (1)
Yes
No
Yes
No
Yes
No
Does DC +5 V, DC +12 V appear
at Pins 29, and 32 of IC401?
Yes
No
Does signal appear at base
of Q405?
Yes
No
Check Q405.
Does signal appear at collector
of Q405?
Yes
No
Check Q410.
Does flyback signal appear at
collector of Q410?
Yes
No
Check Q506, Q507, Q508 and Q509.
Does switching pulse appear at
base and collector of Q509?
Yes
No
Check IC501 and FBT.
Does signal appear at gate
of Q512?
Yes
No
WAVEFORMS
6
14
22
23
If in a protection case, you must check these case
• Check CN401 and CN402.
• Check Screen VR.
• Check VR501.
9.24 V (IC401, #26)
CH1 P-P = 9.24 V CH1 RMS = 6.048 V
6
1.072 kV (Q410, Collector)
CH1 P-P = 1.072 kV CH1 RMS = 310.0 V
14
6.80 V (Q509, Base)
CH1 P-P = 6.80 V CH1 RMS = 1.456 V
22
952 V (Q509, Collector)
CH1 P-P = 952 V CH1 RMS = 307.2 V
23
Page 4
7 Troubleshooting
7-4 CKF5607L
Check IC401
7-5 No Raster (2)
Check signal cable connection
and the signal sources.
Check IC104.
Power indicator is toggle
Check Micom and IC202.
Does H/V sync pulse
appear at Pins 4
and 10 of IC104?
Does H/V sync output
appear at Pins 20
and 21 of IC202?
Yes
No
Yes
No
Page 5
7 Troubleshooting
CKF5607L 7-5
Replace the IC105.
Check DC 8.2 V line D101, D102,
IC101, IC603 and Q102.
Power indicator is green
Check signal cable
and signal source
Does DC 8.2 V appear at
Pins 9 and of IC101?
Does the video pulses
appear at Pins 2, 4 and 6
of IC101 on the Video Board?
Check contrast circuit
on the main Board
(Q102 and Q513).
Check DC 70 V at Pin 6 of IC105.
Check IC202 (pin
#16) on the main
Board.
Does the video pulse
appear at Pins 15, 19 and
22 of IC101?
Does the clamp signal
appear at Pin 16 of IC202?
7-6 No Video
Yes
No
Yes
No
Yes Yes
No
No
No
Does the video amplified
pulse appear at
Pins 8, 9 and 11 of IC105?
Yes Yes
Does the H-BLK
appear at Pin 24 of IC101?
No
29
28
33
WAVEFORMS
5.36 V (IC202, #16)
CH1 P-P = 5.36 V CH1 RMS = 1.036 V
28
800 mV (IC101, #2, 4, 6)
CH1 P-P = 800 mV CH1 RMS = 3.162 V
29
3.34 V (IC105, #8, 9, 11)
CH1 P-P = 3.34 V CH1 RMS = 3.088 V
33
Page 6
7 Troubleshooting
7-6 CKF5607L
OSD Gain (IC101 Pin 11) Check IC102.
When you push a button
on the front control panel
does the voltage vary at Pins
18 and 19 of IC202?
Check horizontal flyback pulse
generation circuit.
(T402 Pin 10, and Q414)
While pushing a front
control button does any pulse
appear at Pins 18 and 19 of
IC202?
Does the horizontal
flyback pulse appear
at Pins 8, 9 and 11 of IC105?
Check vertical blanking pulse
generation circuit.
(Q501 and Q201)
Check the push buttons
control board SW1 ~ SW6
and main board CF202.
Check the pins of IC600
and the related circuit.
Does the vertical
blanking pulse appear at
Pin 5 of IC102?
7-7 No OSD Displays
Yes
Yes
No No
Yes
No
Yes
No
Does the OSD video
signal appear at Pins
7 and 8 of IC102?
Yes
Does DC 5 V appear at
Pin 4 of IC102?
Yes
No No
Does the OSD output
signal appear at Pins
21, 22 and 23 of IC102?
Yes
No
There is video but no OSD.
Check IC202.
Check IC102.
33
32
WAVEFORMS
3.34 V (IC105, #8, 9, 11)
CH1 P-P = 3.34 V CH1 RMS = 3.088 V
33
4.52 V (IC102, #5)
CH1 P-P = 4.52 V CH1 RMS = 3.920 V
32
Page 7
7 Troubleshooting
CKF5607L 7-7
The raster color is
light red or cyan
Check the red video circuits.
(IC103, IC105, Q103 and DR05)
The raster color is
light green or magenta
Check the green video circuits.
(IC103, IC105, Q154 and DG05)
The raster color is
light blue or yellow
Check the blue video circuits.
(IC103, IC105, Q105 and DB05)
7-8 No Specific Color Appears
7-9 Degauss Operation Failure
Replace IC202.
Replace Q600.
Check and replace if necessary
RL601.
When you push the manual
degauss button,
does 5 V appear
at Pin 3 of IC202?
When pushing the manual
degauss button, does the Q600
operate well?
Yes
No
Yes
No
Note: Removing the signal cable displays a self raster screen. This screen displays the message
“check signal cable” along with red, green and blue boxes. Use these boxes to check
whether each individual color (R, G, B) is operating or not.
Page 8
7 Troubleshooting
7-8 CKF5607L
LED ColorVideoMode
Sync
H V
Normal Active Active Active Green
Stand-By Inactive Active Blank Amber
Suspend Active Inactive Blank Green/Amber blinking
Off Inactive Inactive Blank Amber blinking
7-10 Power Save Management System Failure
Does +5 V appear at
Pins 1 and 2 of IC202?
Yes
No
1.Check H & V Sync input (inactive)
2.Check IC202
Does 0 (zero) V appear at
the collector of Q603?
Yes
No
Check D609, Q601 and Q603.
OK
7-10-3 Off Mode
Table 7-1. DPMS Logic Table
Note: If the signal cable is removed, DPMS function does not operate and a self raster displays.
Does +5 V appear at
Pin 1 of IC202?
Yes
No
No
1.Check H-sync input (inactive)
2.Check IC202 and its related
circuits
Does 0 (zero) V appear at
Pin 2 of IC603?
Yes
No
Check IC603.
OK
7-10-2 Suspend Mode
Does DC +5 V appear at
Pin 7 of IC202?
Yes
1.Check V-Sync input (inactive)
2.Check Q202.
OK
7-10-1 Stand-By Mode
Page 9
7 Troubleshooting
CKF5607L 7-9
7-11 User Controls Don’t Work
Check the buttons.
(SW1 ~ SW6)
Check IC202, Q202 and
RESET circuit.
Does the DC level change at Pins
13 and 14 of IC201 when you push
the front panel button?
Yes
No
Page 10
Memo
7 Troubleshooting
7-10 CKF5607L
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