Hitachi Director's P60X901, Service Manual

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Trouble-shooting guide for audio failure.
No sound, abnormal sound
Cable/Air, Input 1/2/3/Front HDMI1/2
No
Check Speaker
Are waveforms at
terminals of speaker
OK?
Yes
No
Repair/Replace
Main-Digital board
Yes
Are waveforms at
Vias 1(R) and Vias 2(L) at the
Main-Digital board
OK? *
Are all analog inputs failing?
Yes
Is there DC level (+5Vdc) in
the checked waveforms of the
mentioned Vias1(R) and Vias
2(L)?
Yes
Repair/Replace the
Terminal board.
No
B
No
Input 1 or input 2 or
Input 3 failing?
No
Yes
Repair/Replace the
Terminal board.
Is Input-Front failing?
No
Yes
Check the Input-Front terminal or the Control board or the
connector from control board to the terminal board. Check
the waveforms at TP07(L), TP08(R) which are next to the
PTC connector base in the Terminal board.
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Is analog audio
signal from tuner
failing?
No
Yes
Is Monitor Out
audio failing?
Yes
Repair/Replace the
Terminal board.
Repair/Replace the
tuner or the Terminal
board.
Is audio signal
failing from tuner UT01
pin no. 15 (R) or
no. 16 (L)?
Yes
No
* Note: Check the location of
the Vias at the end of this flow
chart.
Waveform at
Vias 1 and Vias 2
1KHz sine wave, 1.5Vpp.
HDMI-FRONT
Are SD
Board and EMH
Flat connector to
Digi-Main
OK?
Yes
Repair/Replace SD
board or connector.
A
Follow “A” instruction
in video
troubleshooting of
terminal board.
Cable/Air
No
1 4 0
IN DE P TH TROUBLESHOOTING OF DIGI-MAIN RELATED TO AUDIO PROBLEMS