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5-5
Distorted audio and loud noise
No
Yes
No
Yes
Yes
No
Distorted audio and
loud noise
Replace R148 and R163
Check and repair the circuit
of
VGL and VGH
Replace Q22,Q24
Check whether
R148 and R163 are
normal
Yes
Check whether the
muting transistor
Q22,Q24 are normal
Checking the U8 leads
the feet has no to break
to open
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Check whether there are
wrong components
around U8
No
Yes
Check whether the power of U8
supply voltages VGL and VGH
is normal.
Yes
Replace
U8
Replace them
No
Trouble shooting chart
Summary of Contents for PET717
Page 33: ...Main Board Print Layout for PET717 93 Top Side 9 1 9 1 ...
Page 34: ...Main Board Print Layout for PET717 93 Bottom Side 9 2 9 2 ...
Page 35: ...TFT Board Print Layout for PET717 93 Top Side 9 3 9 3 ...
Page 36: ...TFT Board Print Layout for PET717 93 Bottom Side 9 4 9 4 ...
Page 37: ...Key Board Print Layout for PET717 93 Top Side 9 5 9 5 ...
Page 38: ...Key Board Print Layout for PET717 93 Bottom Side 9 6 9 6 ...
Page 39: ...IR Board Print Layout for PET717 93 Top Side 9 7 9 7 ...
Page 40: ...IR Board Print Layout for PET717 93 Bottom Side 9 8 9 8 ...