Slide 8
Quick Procedure To Check For Short or Low Resistance
Condition of the Vsus, Vda, and P15V Lines
1.
Make sure the TV is disconnected.
2.
Remove any residual charge from the Vsus and Vda
lines by momentarily grounding them through a 500
ohms resistor (At least 5Watts).
3.
Measure the resistance between chassis ground and
the pins indicated on the table below. A dead short or
a reading lower than 1K indicates a shorted or
partially shorted line.
Note:
Vsus
is generated by the Power supply and is only used by the SS and SC boards
Vda
is generated by the Power supply and is only used by the Panel (Panel Drive ICs)
P15V
is generated by the Power supply and is used by the A, SS, and SC boards
Test points for the Vsus, Vda, and P15V can be easily found on
the P board. To check for short circuit or low resistance on
these lines, follow this procedure:
TC-P42G25
Preparation
Voltage Test Points
Connector
/
Wire Color
Pin Number
Voltage
P11
/White
1
Vsus
P11
/
Brown
4
P15V
P35
/White
1
Vda
TC-P46G25
TC-P50G20 TC-P50G25
TC-P54G20 TC-P54G25
Note:
For a quick procedure to determine the cause of the problem
when a short or low resistance reading is found, see the next page.
For a detailed procedure, see pages 11~16
Summary of Contents for G20 Series
Page 11: ...Detailed Troubleshooting Procedure for Shorted Vsus Slide 11...
Page 13: ...Detailed Troubleshooting Procedure for Shorted P15 Slide 13...
Page 15: ...Detailed Troubleshooting Procedure for Shorted Vda Slide 15...
Page 17: ...Troubleshooting 1 Blink Failure Slide 17...
Page 19: ...Troubleshooting 2 Blinks Failure Slide 19...
Page 22: ...Troubleshooting 3 Blinks Failure Slide 22...
Page 25: ...Troubleshooting 4 Blinks Failure Slide 25...
Page 28: ...Troubleshooting 5 Blinks Failure Slide 28...
Page 32: ...Troubleshooting 6 Blinks Failure Slide 32...
Page 35: ...Troubleshooting 7 Blinks Failure Slide 35...
Page 38: ...SU SD boards Together Isolation Procedure Slide 38...
Page 42: ...Vfo VSCN F 5V_F Resistance Measurements SU SD boards Slide 42...
Page 45: ...Troubleshooting 8 Blinks Failure Slide 45...
Page 48: ...Troubleshooting 9 Blinks Failure Slide 48...
Page 50: ...Troubleshooting 10 Blinks Failure At Plug in Slide 50...
Page 52: ...Troubleshooting 10 Blinks Failure At Power on Slide 52...
Page 54: ...Troubleshooting 12 Blinks Failure Slide 54...
Page 57: ...Troubleshooting No Power Dead Unit Slide 57...
Page 60: ...TV s Behavior After Connectors Removal Slide 60...
Page 62: ...End Slide 62...