Hitachi P50H401/DW3, Service Manual

Page: 57 / 125

DW
3
U
TROUBLESHOOTING FLOW CHARTS
56
[Terminal PWB circuit tro
A
uble shooting]
No picture, no color or dark
A
Are waveforms at
Q013-E(Y), Q012-E(PB) and Q011-E(PR)
OK?
Yes
No
Analog format signal
NTSC, composite, s, component
Digital format signal
HDMI Cable/Air
Check Main-Digital board
Are waveform at
pin26(CV) of I001 OK?
Cable/Air
Component video input
Composite video input
Check Input terminal
Check IT06, IT07
or Main-Digital board
Check UT01 (Tuner)
Are waveforms at
pin73/67(Y), 71/65(PB) 69/63(PR)
pin10/22/53(CV) pin14(Y), 12(C)
of I001 OK?
Yes Yes
Yes
No
No
No
Check I001
Are waveforms at
pin 9(SDA), 10(SCL) and
voltage at pin 2/7/18/20(+5V)
of UT01 OK?
No
Is the indication
[LOCK] ?
Yes
Follow next procedure:
(1) Select ‘Maintenance’ of Adjustment mode menu.
(2) Press SELECT. (while ‘<Display>’ at “Front End” lights yellow.)
(3) Check the indication of ‘Frame/MPEG Lock’ line.
Check UT01 (Tuner)
Check Main-Digital board