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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.
If the low disappears, the panel is defective. (But, please check SDR buffers first.)
If the low remains, the Y-SUS and/or SDR PWBs are defective.
See the "PRELIMINARY OBSERVATION" on page 1 and see if the buffers are defective.
No Low Value found; Re-Visit "PRELIMINARY OBSERVATION" on page 1.
If no evidence found: Pull the Ribbon cables to the Panel.
Does Va / Vs voltage stay up?
Yes: Defective Panel
No: In this case neither PWB can be confirmed as the fault. Most often it will be the Y-SUS PWB...
Remember: You "Can" disconnect the SDR Upper or Lower or both from the Y-SUS PWB and test
Vs/Va voltages. They will come on and stay up with these PWBs removed from the Y-SUS PWB.
If the answer is 3) No Vs/Va activity.
This usually indicates either a dead load on the line or no Vsago / Vcego commands from the Logic PWB CN68.
First check:
Check the Va/Vs turn on commands.
Remember: The SBY 5V from CN63 pin 1 must be present before Vsago / Vcego lines can function.
When the Power Button is pressed, within moments, (Vcc5.1V) should come when the Vcego and Vsago
Commands go high. (See the next 4 pages for Power Supply pin descriptions and voltages).
6
CN61 AC In (All models but the 42")
See below figure for Pin locations on the Power Supply PWB
DW-3 POWER SUPPLY CONNECTOR IDENTIFICATION
1
CN61 AC In 42" Models
Test Point CN99
Va pin 1
Vs pin 2
Gnd pin 3
1
CN64
10
CN64 in the
42" has only
1
9 pins
CN99
3
15
1
CNPPS
1
CN68 in the
CN63
CN68
60" has
8
1
9
11 pins
Continued on Next Page
Page 4 of 10
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