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7 Troubleshooting
7-2-21 Horizontal Blank Failure
Symptoms: – Dark image and if shifting image to left or right side, image is rolled.
– Raster left or right side is rolled.
Is H_Blank waveform on
31
Q510's collector?
No
Are Q504 and D517 ok?
Yes
Check and replace C503, C516,
R540, C515.
7-2-22 Whistle Sound
Check trans coil (L401, T501, T601, CRT)
7-2-23 Spot at Center During Power Off
Does G1 voltage vary from
–60~80 Vrms to –200 Vrms during
power off time? (After falling
32
down to –200V, G1 voltage is
slowly increased to 0V).
No
Are 12 V line and Q504 ok?
Yes
Check and replace D510, R513,
R521, R520, C518.
7-24
Yes
Check CN202 and CN202_2.
Check and replace IC101.
No
Replace it.
Yes
Check and replace CRT.
No
Replace it.
WAVEFORMS
31
5.36 V (Q510, Collector)
CH1 P-P = 5.36 V
CH1 RMS = 4.210 V
WAVEFORMS
158 V (CN202, G1)
32
CH1 P-P = 158 V
CH1 RMS = 151.1 V
CHA42*7L/5**7L
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