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Troubleshooting - Hitachi 42HDM12 Service Manual

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6. Troubleshooting

The flow chart shown below will help you to troubleshoot your Monitor set with it doesn't display normally.
Each procedure offers a simple way to check for system errors. Before starting, ensure that there is a signal in
and that the Monitor is turned on.
Power turn on issue
Power cannot be turn on (LED does not light)
Is the input voltage
applied to Power
supply unit?
(CN61 ①③)
Check if the Power Cord
has been well connected
to TV?
Are the voltages applied
to CN10①⑤⑥ pins and
CN11①③④⑩ pins of
Power supply unit?
PBC-Main
No
AC inlet
Yes
Yes
Yes
Note: Voltage shown for CN10 and CN11 are at Power On State.
Power off voltages are 0V, except CN11 Pin 10, this voltage is always
present.
Power
switch
Connect the wire
No
properly.
No
①L ③W
(CN61) 110V
(CN10)
①+5V ⑤+12V ⑥+12V
(CN11)
①+5V
11
AC Fuse 5HTP10
TL.510A 250V
Test again
Power supply unit
③+3.3V ④+3.3V ⑩+5V
CH 1
Filter
PWB

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42hdm12a