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DW-3 NO PICTURE TROUBLESHOOTING Page 10 of 10
The following are Key Points related to the DW-3 Power Supply;
1.
Generates Stand-By 5V any time AC is applied to the Power Supply PWB, No matter if set on or off.
2.
The Digi-Main PWB generates Power 1 and Power 2 commands on the CN63 connector when the set is in
"Quick Start" (Instant On) even when the set is off (See 3 below) and when the set is turned on.
3.
Generates All voltage on the CNPPS connector when the set is in "Quick Start" (Instant On) because of
Power 1 and Power 2 are high.
For the following reasons;
•
•
•
4.
Power 1 and Power 2 CN63 connector DOES NOT turn on Vs and Va or Vcc +5.1V voltages, it only turns
on CNPPS voltages.
5.
Power 1 and Power 2 CN63 connector comes from the Digi-Main PWB PPM1 connector.
6.
Vsago and Vcego CN68 connector DOES turn on Vs, Va and Vcc +5.1V voltages. (Also –Vs 42")
7.
Vsago and Vcego CN68 connector comes from the Logic PWB CN6 connector.
8.
The CN68 connector must be unplugged and then reinserted to reset the Power Supply if Vs/Va did not
come up for some reason.
If this is not done, Vsago or Vcego will never attempt to turn on Vs/Va again.
(If AC is remove, this will reset the Power Supply, but it takes over 5 minutes).
9.
The Power Supply can be forced On (2 procedures) to test all power supplies.
•
First: One Procedure to test all voltage but Vs, Va and Vcc +5.1V. (Also –Vs 42")
•
Second: One Procedure to test Vs, Va and Vcc +5.1V voltages. (This procedure requires the First
process to be active.) (Also –Vs 42")
10. Vcc (5.1V) CN64 pin 3 and CN68 pin 1 is generated on the Power Supply and is an output voltage from the
Power Supply, not an input.
11. (Series 1 Models) CNPPS Pins 7, 13, 14, 15 are all tied together (speaking of solder path), they are the same
Voltage.
(Series 2 Models) CNPPS Pins 13, 14, 15 are all tied together (speaking of solder path), they are the same
Voltage.
12. Vcc (5.1V), CN63 Pin 3 and CN68 Pin 9 are tied together (speaking of solder path). (Series 1 Models)
13. Power 3 is not used, (CN63 connector).
14. Vra / Vrs CN68 connector is used, but there is no technical explanation Series 2 Models. (Not used in Series
1 Models)
15. The Relays RL001 and RL002 turn on any time AC is applied to the Power Supply PWB with the following
conditions.
•
If "Quick Start" is off, both relays turn off after a little more than 2 minutes when AC first applied.
•
If "Quick Start' is on, both relays stay on.
•
When the set is turned on, both relays turn on.
The TV turns on quickly
Data communications do not have to be re-initiated at turn on
The Sub-Digital PWB digital Tuner can be on
Page 10 of 10
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