Slide 78
Troubleshooting 7 Blinks Failure (VFO/VF5V Resistance Check)
From the previous page
Using any of the VFG screws (Floating ground screws) on the SU or
SD board as ground, measure the resistance of both test points:
VF5V (SRV – VF5V) and VFO (SRV – VFO) on the SU board.
(See the picture below.)
YesNo
Is there a
short
circuit?
See the picture “A” on the next slide and:
• Remove the 2 or 4 VFG screws from the SU and
SD boards.
• Unplug SC41, SC42, and SC46 from the SC
board.
• Install the SC50 Jig or just jump pins 1 and 2 of
connector SC50 on the SC board.
• Plug in the TV. Note: If the power LED does not
turn on automatically after the TV is plugged
in as expected, then press the power switch.
A - Continue
on the next
slide
YesNo
Does the TV
shut down
with 7 blinks?
Replace both
the SU and
SD boards
Replace the SC
board
(2 of 4)
VFG
Screw
SRV VFO
SRV VFO
SRV VFO
SRV VFO
VFO
F5V
SC
SC
SU
SU
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