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9. Abnormal Picture
9-1. Horizontal Size
Abnormal
H.Size
Is
the DC level
No
of the base of Q517
changeable?
Yes
Is the
collector pulse
=1100Vp-p
of Q505 correct?
Yes
No
Is the
cathode waveform
of D509
80-310Vpp
correct?
No
Yes
Trouble in H.OSC/
Deflection Circuit
Refer to Horizontal Output circuit
* At first, adjust controls in the OSD Menu
Is
Check IC501
the DC level
Yes
of IC501 pin 24
pin 24
changeable ?
Trouble in Horizontal
output circuit
* Normally anode voltage
Check the B+ and
of CRT is approximately,
anode voltage of CRT.
25 KV
* Scan B+ are as follow :
Trouble in L504,
C520 or their ambient
circuit
MODE
B+ Voltage
31KHz
60Vdc
37KHz
70Vdc
43KHz
80Vdc
54KHz
105Vdc
60KHz
120Vdc
68KHz
145Vdc
24
9-2. Vertical Size
Abnormal
V.Size
Is
Is changeable the
changeable the
No
DC level of pin
Waveform of
23 of the IC501?
IC401 pin 1?
Yes
Trouble V.OSC/
Check the IC501
Deflection Circuit
and its ambient circuit
Refer to V.OSC/Deflection circuit
Yes
Trouble in R407, C404
No
25
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