Panasonic TC-PXXGT30, Technical Manual

Page: 81 / 83

Procedure to Check The Power Supply (Without Any Load)
The Power Supply can be tested without any load by removing several connectors from the P and A boards.
Remove the following connectors from the P board:
P2, P11, and P35.
Remove the following connectors from the A board :
A11, A12, A20, A31, A32, A14, and A40.
Procedure:
1. Plug in the TV. The relays from the P board should click. ( Note: if a second click is heard approximately 10~15 seconds
after the 1
st
click, the F15V is confirmed to be present.)
2. Turn the power on. ( Note: The power LED should turn on and the fans should be running. If this is the case, measure the
Vsus and Vda.)
Vsus can be measured on pin 1 of connector P2 or P11.
Vda can be measured on pin 1 of connector P35.
3. If these voltages are OK, then the power supply is OK. ( Note: The TV won’t turn on if there is a short circuit on the
P15V.)
Note: If there is a short circuit on the Vsus or Vda lines while this test is conducted;
• The SOS4_PS is not triggered. Pin 4 of connector P6 stays low. ( Note: The PS SOS only monitors over-voltage conditions.
• The TV will still turn on without Vsus or Vda.
• The fans will continue to run.
Caution: Do not allow the TV to run for more than 30 seconds when isolating the power supply.
Slide 81