Hitachi P50H401/DW3-U Service Manual page 117

IN DEPTH TROUBLESHOOTING OF DIGI-MAIN RELATED TO VIDEO PROBLEMS
NOTES: Remember! Your first checking instruments are your senses; see, smell, touch, hear before following the next troubleshooting guides.
Find additional troubleshooting information from the website: www.hitachiserviceusa.com.
No picture, no color or dark
Analog format signal from Tuner,
composite, S-video, component
Are waveforms at
RL69(Y), RL67(PB) and RL66(PR) in
Main-Digital board
OK?
No
Are all analog inputs failing?
No
Input 1 or input 2 or Input 3
failing?
No
Is Input-Front failing?
No
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Trouble-Shooting Guide for video failure.
Digital format signal
Yes
Replace/Repair
Main-Digital board
RL69 (Y)
Yes
Yes
Repair/Replace the
Check the Input-Front terminal or the Control board or the
connector from control board to the terminal board. Check
Yes
the waveforms at TP01(CV), TP03(Y), TP05(C) which are
NOTE: Waveforms were taken with a 480p YPbPr Color Bar signal
HDMI1/2 HDMI-FRONT
Yes
Board and EMH
Flat connector to
Digi-Main
RL67 (PB)
Is there DC level (+2Vdc) in
the checked waveforms of the
RL69, RL67, RL66 resistors?
No
Terminal board.
next to the PTC connector base in the Terminal Board.
115
Cable/Air
A
Are SD
No
Repair/Replace SD
board or connector.
OK?
RL66 (PR)
Repair/Replace
Yes
the Terminal board.
B
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