Sos Detection Circuits; Sos Detect (D Board); Sos Detect (Dg Board) - Panasonic TH-37PX50U Technical Manual

SOS Detection Circuits

SOS Detect (D Board)

The GPH8DU chassis
have several protection
circuits that are designed
to protect the receiver from
major damage. The MPU
IC9003 of the D board is
used to detect and store
the history of abnormalities
that may be caused by a
defect in certain sections
of the unit. The input pins
of the MPU, as shown in
the figure on the right, are
used to detect possible
abnormalities. If one of the
protection circuits is
activated by some fault
within the receiver, the
problem facing the
technician is to find out
which protection circuit is
shutting down the receiver and why.

SOS Detect (DG Board)

The MPU IC4005 of the DG
board is used to detect and store
the history of other abnormalities
that may be caused by a defect in
certain sections of the unit. The
input pins of the MPU, as shown
in the figure on the right, are used
to detect possible abnormalities.
If one of the protection circuits is
activated by some fault within the
receiver, the problem facing the
technician is to find out which
protection circuit is shutting down
the receiver and why.
Figure 36
Figure 37
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