Trouble shooting flow chart
PHILIPS Confidential – Do Not Copy 105S5
2. Horizontal deflection circuit is defective.
The horizontal deflection
circuit is defective
Is the voltage on terminal
TP208=45V?
Is the power supply
circuit normal?
Is the pin1 waveform of
IC401 normal?
Is the pin28 waveform of
IC401 normal?
Is the pin26 waveform of
IC401 normal?
Is the waveform of Q402
"collector" normal?
Is the waveform of Q401
"BASE" normal?
Is the diode modulatic
circuit normal?
Is the voltage on terminal
TP201=75V?
Check power supply
circuit
Check H.sync input
Q402 is defective
Horizontal drive is
defective T401, Q401,
FBT
Diode modulation circuit is
defictive C401, D401,
D402,C414, C415, Q409,
C416
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
0.8Vp-p
64Vp-p
2.4Vp-p
12Vp-p
4.6Vp-p
fH
CRT is defective
No
Check IC401 pin26
normal?
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