Tip & How-To about Philips Televison & Video
How to test Flyback Transformer Without taking it off the Board
a) Basically it has to be acted upon by a supply voltage of at least 95V
b) Of course, assuming the horizontal deflection oscillator works, same
with the horizontal drive and horizontal output transistor
sample of H out transistor
It would generate output voltages on the secondary terminals
and 200V line will be active sending voltages to the
Video Drive circuits. Of course high voltage will be generated
ranging to at least 30 KV and there will be voltages on the G2 of the CRT.
c) The easiest test point to look when it is oscillating, is the CRT heater
voltage, the heater lit when flyback is good ( mostly at night times when it
is dark ) and you can hear sounds, too ( if speaker is connected).
• Heater : marked with letter H and H1
• Green Arrow for the G2 voltage
d) Having a B+ voltage reading of 75 V or lesser ( primary pins )
indicates a bad or partially shorted flyback, assuming your
horizontal output transistor and power supply are good & OK.
• These only applies to CRT type TV's.
Posted by Rommel... on
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