Philips 105S5 - Vertical Deflection Is Defective VII-4

Trouble shooting flow chart
PHILIPS Confidential – Do Not Copy 105S5
VII-4
3. The raster don’t appear.
4. Vertical deflection is defective.
The raster don't appear
Is the C425= -200V
normal?
Does the CRT heater
glow red?
Does the entire screen
light up?
Turn the FBT screen
clockwise
FBT is defective
R457, D420 are defective
Is the voltage at the heater
pin of CRT socket
normal?
D206,Q208, R226 are
defective
Heater voltage
approx. 6.3V
Video circuit Q420 g1
voltage control are
defective
No
Yes
Yes
No
Yes
No
No
Vertical is defective
The picture is one
horizontal line
Is the waveform pin14 of
IC401 normal?
Check the dflection Yoke
Is the waveform at pin5
of IC501 normal?
R502 is defective
Check V-sync of IC301
pin32 or signal cable
Is the IC501 pin2=13V
pin4=-11V?
Is the waveform of IC401
pin21, pin23 normal?
Are R502 normal?
Check power supply 13V,
FBT -11V
IC401 is defective
5Vp-p
45Vp-p
Yes
Yes
Yes
Yes
No
No
No
Yes
No
No
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