Quick Procedure To Determine The Cause Of The Problem If A Short Or Low - Panasonic G20 Series Troubleshooting Handbook

Quick Procedure To Determine the Cause of the
Problem if a short or Low Resistance Reading is Found
Shorted Vsus
If a short is found on the Vsus line, remove connectors P2/SC2 and P11/SS11 one at a time to determine if the SC
board or the SS board is defective.
Shorted Vda
If a short is found on the Vda line, is likely that the panel or one of the C boards is defective. To determine which is
defective, remove connector C10 between the C1 and C2 boards and the panel's flex-cables connected to the
C boards one at a time.
Shorted P15V
P15V is generated by the
Power supply and is
used by the A, SS, and
SC boards
If a short is found on the P15V
line, remove connectors P6,
P11, P25, and SC20 one at a
time to determine which board
is defective. A shorted P15 is
primarily caused by the
following boards in the order
presented; SC, P, A, and SS
boards.
Note: Even though is not
common, the P board can also
cause a shorted Vsus, Vda, or
P15V.
Note: For a detailed procedure, see pages 11~16
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)
Note: For a detailed procedure, see pages 11~16
Vsus, Vda, and P15V Distribution
Slide 10