Daewoo DSJ-4710CRU Service Manual - page 33
Manual is about: REAR PROJECTION TV
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TROUBLE SHOOTING
High voltage drive
Check F401 #10 (HVG B+135V)
If resistance between Q430 collector and
base is near, horizontal output TR has
been destroyed.Replace the TR.
Check R445
Check F401 (High
Voltage Generator)
font
Check F401 #7 (OVP) high voltage
control oscillating waveform
Check R447
Replace I421
No
No
Yes
Q891 Base 0V
Horizontal
Deflection
Check F401 #8 (HVG B+135V)
Voltage waveform of Q430 collector is
shown below.
When power isn’t supplied
END
1000 50Vp-p
NO
NO
END
NO
45VP-p