Panasonic TC-PXXGT30, Technical Manual

Page: 54 / 83

VFO/VSCN_F and VF_5V Resistance Test (50”~65” Slim Models (GT30 and VT30))
This test can be used to quickly determine if either
the SU, SD, or/and the SC board are bad.
Note:
even though a short circuit is a clear indication of
a defective board, a no-short-circuit condition
does not necessarily means that the boards are
good. Follow the isolation procedure to determine
if these boards are good or bad.
Preparation:
Unplug the TV prior to making any disconnection
or connection.
Wait at least 2 minutes before removal of any
connector.
Note: If the power LED continues to blink even
after the TV has been unplugged, press and hold
the power switch on the TV for a few seconds until
the LED turns off.
Resistance Test
Procedure to determine if there is a short
circuit or low resistance reading of the Vfo
(TPSC1) or the VF_5V (Junction of R696~R699).
Using VFG (Floating ground screws) as ground,
measure the resistance of:
1. Junction of R696~R699) (TPSC1/VSCN-1)
2. Pin 3 of IC724 (VF-5V)
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Slide 54