Hitachi P50H401/DW3-U Service Manual page 144

TROUBLESHOOTING THE 42AE1 PANEL: TROUBLESHOOTING THE 42AE1 PANEL:
4.6.3 "Horizontal bar" Problem analysis procedure
Turn off the main power.
Replace X-SUS board.
Turn on set (Vsago active)
Turn off the main power.
Take off X-SUS board.
Put back original X-SUS board
And Replace Y-SUS board
Turn on set (Vsago active)
Take off Y-SUS board
Put back original Y-SUS board
And Replace SDR U or D board
Turn on set (Vsago active)
Horizontal bar
Y
Normal?
N
Y
Normal?
N
Turn off the main power.
Y
Normal?
N
X-SUS board is defective.
Y-SUS board is defective.
SDR U or D board is defective.
Panel is defective.
Turn off the main power, End of analysis
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