Hitachi P55H4011 Troubleshooting Manual

DW-3 NO PICTURE TROUBLESHOOTING Page 1 of 10
DW-3 CHASSIS PLASMA DEFECT TROUBLESHOOTING PROCEDURE.
The Below Information relates to investigations related to a Defective Plasma when there is no Picture at all.
Use this section for P42H401, P42H4011, P50H401, P50H4011, P55H4011 and P55H401 and P42T501,
P50S601, P50V701, P50X901, P50T501, P55H401, P55T501 and P60X901 Plasma Television.
No Picture:
1. The Power Supply may not be producing the correct voltages.
2. The Digital Module (Digi-Main) may not be producing correct
turn on commands (Power 1 and 2).
3. The Logic PWB may not be supplying the correct Vs/Va turn on
commands (Vsago and Vcego).
The Panel can have a defect of two natures.
1. The panel is shorted.
2. The panel is defective, but not presenting a short.
3.
Y-SUS and/or X-SUS may be defective (Shorted and or non-
working).
First monitor the front Power LED.
•
Does it turn on, then go completely off? (Indicates Shutdown), Power Supply not running.
(Shutdown usually indicates a Short.)
•
Does it turn on and stay Green, but no picture. (No Shutdown),
•
Power Supply running basic power supplies, but Vs/Va voltages not being produced.
PRELIMINARY OBSERVATION:
Next open the unit by removing the back cover. Check the following carefully by visual observation.
Power Supply PWB: Look very carefully around all mounting screws for cracks or PWB damage.
BUFFERS (Drivers) ON SDR Upper and/or Lower PWBs (50"~60")
Take a moment to carefully observe the Buffer "Snot" Chips
(Left Side black chips mounted on the SDR Upper and Lower PWBs).
Look very closely for burns and/or small holes in these chips.
If any defect is seen, the PWB is defective. Replace this PWB and
the Y-SUS if PWB not upgraded. Replace only SDR if PWB is upgraded
SDR U / L
COF (Chip on Film) from Panel to A-BUS (42")
Take a moment to carefully observe the COFs Chip on
Film (Mounted on the flexible ribbon cables). Look very
closely for burns and/or small holes in these chips.
Look very closely for any ribbon cable damage on the
connections to the Panel itself from the
A-BUS PWBs. If any defect is seen, the Panel is
defective. (Note, some additional disassembly is required
to see these COFs as they are on the underside of the rib-
bon cable coming from the panel to the A-BUS L, R and
C PWBs.)
Version 04 (02/05/2008)
Continued on Next Page
NOTE: It would be very helpful is you have
one other document to accompany this one.
(On our web site, see these models Things
You Should Know section Power Supply
Issues to download these documents.)
DW-3 Power Supply Explanation.pdf
http://www.hitachiserviceusa.com/service/
Seminars/Plasma-Web/DW3-Web/Fixes/
00-Things-Known.htm
HOLES
BUFFER BUFFER
See Web site Things You Should Know
Picture Issues Item 25 to determine if PWB
is upgraded.
TO PANEL
COF COF
TO A-BUS CONNECTOR
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