Page 9 of 10
TESTING THE Va/Vs TURN ON COMMANDS:
Press the Master Power (Vacation) Switch (on the bottom) to remove AC.
(60” you must remove AC by pulling
the AC plug itself).
Wait until you hear a "Click".
Unplug the CN68 connector.
Re-Plug the CN68 connector.
•
If this is not done, the Turn On command Vcego/Vsago at Pins 7 and 8 of the CN68 connector will not
happen.
•
This must be done every time a new check is made on the CN68 connector if Va/Vs voltages did not come up
and stay up.
Attach a DC voltmeter to the CN-68 connector Vcego and/or Vsago, (see preceding 4 pages for pin locations).
Press the Vacation Switch to re-apply AC power and wait for about 30 seconds for initialization.
Press the Power Button while watching the voltmeter.
1.
Normal: After several seconds, Vcego and Vsago pins should climb to 3.3V.
2.
Trouble sensed: After several seconds, Vcego and Vsago pins should climb, then drop quickly to
0.2V.
3.
Abnormal: No Activity at all.
Your case will be either 2 or 3 above.
2. TROUBLE SENSED:
There is a Procedure for Forcing the Power Supply to Generate Voltages: Please make sure that the Power
Supply is working correctly first. For Procedure: Please visit our web site:
(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
If the Power Supplies is working OK, then go back to page 3 and see “If the Answer is 2”. Follow the procedure
for checking Y-SUS and X-SUS and the Panel listed above.
3. ABNORMAL: No Activity.
Pull the CN64 Connector.
Repeat: Testing the Vsago / Vcego Turn On Commands procedure.
If your condition changes to (2) above, then there is a load on the Va/Vs lines.
Go back to page 3 and see “If the Answer is 2”. Follow the procedure for checking Y-SUS and X-SUS and the
Panel listed above.
If your condition did not change, then the problem is usually related to the Logic PWB.
But before condemning the PWB, carefully examine the connector from CN68 to the Logic PWB CN6.
Look for cut, tear, and/or pinched shorting out the cable. Examine carefully the connector from the Digi-Main to
the Logic PWB looking for the same problems listed above.
Confirm SBY +5V from pin 1 of CN63.
Note: There are no diagnostic LEDs on the Digi-Main PWB as there have been in the past.
DW-3 NO PICTURE TROUBLESHOOTING Page 9 of 10
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