Hitachi P50H401/DW3-U Service Manual page 58

SYMPTOM
NO POWER, NO LED LIT Check that unit is plugged into live outlet and
that main power switch of unit is turned on.
Check fuse on Filter pwb. Replace power supply.
Blue led blinking always
Turn units master power switch off and back on
(ac reset). If ac reset does not solve the problem
then replace the main digital pwb.
Power led Red. Panel power or RC Suspect main digital pwb.
power does not turn unit on to
.(Blue LED)
Blue LED on, No picture. Power supply is working. See troubleshooting of
X &YSUS pwbs, SDR and Abus pwbs. LINK
No Audio Check 10volt supply to main digital
pwb.Connector PPM3 pins 3,4 or 5. If 10volt
missing disconnect PPM3 and check CNPPS
pins 13,14 or 15. If voltage missing suspect
power supply. If voltage present suspect Main
Digital PWB.
Video Problem If problem is with tuner,
If video missing suspect Sub Digital.
If problem is with Composite or componet
suspect sub digital pwb
If problem is with HDMI suspect Main Digital
Top Half of Picture Missing Check connector from SDR-U to Panel , remove
and reinsert. If problem is same change SDR-U
PWB
Bottom Half of Picture Missing Check connector from SDR-D to Panel , remove
and reinsert. If problem is same change SDR-D
PWB
1 Horz Pixel Line Across the
Check the SDR pwb connector associated with
screen, Horz Bar or multi horz where the line is. Remove and Re insert
HDMI Problems Check Signal Source for Proper HDMI output.
Check other HDMI inputs. Possible cause main
Digital Pwb.
Tuner problems
If problem is with tuner only. Suspect Sub Digital
PWB
Composite, Componet problems If problem with Composite or Componet only
suspect Sub Digital PWB
POSSIBLE CAUSE
POWER SUPPLY
MAIN DIGITAL
MAIN DIGITAL
POWER SUPPLY OR MAIN
DIGITAL
Check monitor out. SUB DIGITAL
SUB DIGITAL
MAIN DIGITAL
SDR-U
SDR-D
IF CONNECTOR NOT THE
PROBLEM THEN PANEL
MAIN DIGITAL PWB
SUB DIGITAL PWB
SUB DIGITAL PWB
Probable Board