Troubleshooting Flowcharts - Hitachi 50HDT50M Service Manual

No picture
No sound
(PDP MONITOR)
Burn-in mode check (*1)
NG?
No
Is AVC Power Indicator
always red and no sound
of Relay heard?
No
Check AVC POWER PWB
Has F901
blown?
No
Has F902
blown?
No
Is R915
open?
No
Is Q933(G) voltage
over 1.0V?
No
A.
TABLE OF CONTENTS

TROUBLESHOOTING FLOWCHARTS

Yes
C
Note (*1)
Disconnect the MONITOR connection cables (DVI/DIN)
and press Sub-Power button for more than 5 seconds.
• The power indication LED would light in green,
and the black raster (not test patterns) would be displayed.
Yes
Caution!
It should be always confirmed that C907(CE220uF/450V)
is discharged when touching POWER P.W.B. with fingers
or soldering iron after power-off in order to prevent
the electric shock and second damage.
Yes Check D901, D902,
C901~C907, etc.
Yes Check I901, D911, T901,
C913, C918, etc.
Yes
Check H901, C909, etc.
Yes
Protection circuit Operation
B.
(Page 49)
Trouble of Main Switching-regulator
(Page 48)
(1 OF 4)
(Trouble of PDP MONITOR )
(Page 50)
Check AVC AV PWB
I001, Q227, Q228, etc.
47
PT3-H AVC3-U