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PDM-4220
Trouble of Sub picture
Are waveforms at
YES
TP68(Y), TP69(Cb)
and TP6A(Cr) ?
NO
Are waveforms at
YES
42pin(Y), 44pin(Cb)
and 46pin(Cr) of I601?
NO
YES (Component Video/RGB-Video)
Component or
RGB-Video Input ?
NO
(RF/Composite Video/
S-Video/HDMI)
YES (HDMI)
HDMI Input ?
NO
(RF/Composite Video/S-Video)
Are waveforms at
YES
78pin(Y), 80pin(Cb)
and 2pin(Cr) of I601?
NO
B
28
Check Formatter PWB
Check Q607, Q608 and Q609
Check I601 and Input terminals
Check I601
Are waveforms at
YES
25pin(Y), 27pin(Cb)
and 29pin(Cr) of I601?
Check I601
NO
Check HDMI PWB
B
Are waveforms at
YES
21pin(Y), 22pin(Cb)
and 23pin(Cr) of I502?
Check Q508, Q509 and Q510
NO
YES (RF/Composite Video)
RF Input or Composite
Video Input ?
NO
(S-Video)
Are waveforms at
YES
44pin(Y) and 43pin(C)
of I502?
Check I502
NO
Are waveforms at
YES
56pin(Y) and 58pin(C)
of I201?
Check Q512 and Q513
NO
Check I201 and Input terminal
YES
Is waveform at
1pin(CV) of I502?
Check I502
NO
YES
Is waveform at
53pin(CV) of I201?
Check Q209 and Q511
NO
YES (RF)
RF Input ?
NO
Check I201 and SUB-TUNER PWB
(Composite Video)
Check I201 and Input terminal
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