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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
Page 1 of 10
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Summary of Contents for Hitachi P42H401
- Page 1 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.
- Page 2 DW-3 NO PICTURE TROUBLESHOOTING Page 2 of 10 PWB QUICK CHECK: Look for any burns, open fuses, etc... If burns found, then replace the PWB. If fuses open, first check for low ohms condition before replacing the fuse an attempting to turn on the set. VOLTAGE CHECKS: (When AC applied, then when the Power Button is pressed) WHEN AC FIRST APPLIED: When AC is first applied, the power supply should turn on and supply the following voltages for a little more than 2 minutes.
- Page 3 DW-3 NO PICTURE TROUBLESHOOTING Page 3 of 10 If the answer is 1) Yes (Green Power LED will be always on) This indicates your providing Vs and Va voltage to the X-SUS and Y-SUS PWBs. Use an Analog Scope. Look at the outputs from the X-SUS and X-BUS.
- Page 4 DW-3 NO PICTURE TROUBLESHOOTING Page 4 of 10 AFTER THE CONNECTOR IS PULLED: If the low disappears, then the Y-SUS or SDR PWBs are at fault. (See Note 1 below before condemning PWB). If the low remains, then the X-SUS PWB is at fault. (See Note 1 below before condemning PWB). NOTE 1: Pull all Ribbon connectors going to the Panel on-by-one while reading the Vs/Va pins.
- Page 5 DW-3 CONNECTORS (42” Pin Configuration) Page 5 of 10 CN64 to X-SUS CN23 CN63 to Digi-Main PPM1 Out/ Out/ Label Label STBY+5.0V 5.2V 5.2V 1.9K↑ 65.2V 13.6K↑ —> —> N.C. N.C. 2.6K↑↑ 5.1V 0.7K↑↑ —> *PoWERoFF 2.8K —> ACCLoCK 3.3V 3.8V 11.1K —>...
- Page 6 DW-3 NO PICTURE (50” Pin Configuration) Page 6 of 10 CN64 to X-SUS CN23 CN63 to Digi-Main PPM1 Out/ Out/ Label Label 65.7V 13.6K↑ STBY+5.0V 5.2V 5.2V 1.9K↑ —> —> N.C. ∞ STBY+3.3V 3.3V 3.3V 2.6K↑↑ —> 5.1V 0.7K↑↑ —> *PoWERoFF 2.8K —>...
- Page 7 DW-3 NO PICTURE (55” Pin Configuration) Page 7 of 10 CN64 to X-SUS CN23 CN63 to Digi-Main PPM1 Out/ Out/ Label Label STBY+5.0V 5.2V 5.2V 1.9K↑ 65.1V 13.6K↑ —> —> N.C. ∞ N.C. 3.3V 3.3V 2.6K↑↑ 5.1V 0.7K↑↑ —> *PoWERoFF 2.8K —>...
- Page 8 DW-3 NO PICTURE (60” Pin Configuration) Page 8 of 10 CN64 to X-SUS CN23 CN63 to Digi-Main PPM1 Out/ Out/ Label Label 13.6K↑ —> STBY+5.0V 5.2V 5.2V 1.9K↑ —> 13.6K↑ —> STBY+3.3V 3.3V 3.3V 2.6K↑↑ —> 5.1V 0.7K↑↑ —> *PoWERoFF 2.8K —>...
- Page 9 DW-3 NO PICTURE TROUBLESHOOTING Page 9 of 10 TESTING THE Va/Vs TURN ON COMMANDS: (60” you must remove AC by pulling Press the Master Power (Vacation) Switch (on the bottom) to remove AC. the AC plug itself). Wait until you hear a "Click". Unplug the CN68 connector.
- Page 10 DW-3 NO PICTURE TROUBLESHOOTING Page 10 of 10 The following are Key Points related to the DW-3 Power Supply; Generates Stand-By 5V any time AC is applied to the Power Supply PWB, No matter if set on or off. The Digi-Main PWB generates Power 1 and Power 2 commands on the CN63 connector when the set is in "Quick Start"...