Affected Models: Some 2011 & 2012 Models (SN, SC & SS boards) - see below.
Symptoms: * Buzzing noise.
* Humming noise
Cause: Loose screws mounting PCB to the chassis
Study\Results: Problem due loose mounting screws on P, Psub, Psus, SC, SS, SS2, SU or SD PCB boards.
Countermeasure: Using manual screwdriver replace all mounting screws on P, Psub, Psus, SC, SS, SS2,
SC, SU or SD PCB from kit part number TXFQA0912SER.
Re-tighten all Signal and Floating Ground screws on SC and SS PCB
Caution: The kit contains 18 screws with locking washer. Use more than one kit when required.
Refer to below diagram for total mounting screw number.
2011 SS2 Pmain Psus Psub SC/SN SS SU SD Total
TC-60PS34 2 7 4 4 9 7 3 3 39
TC-P42S30 0 7 0 0 8 5 0 0 20
TC-P42ST30 0 7 0 0 8 5 0 0 20 Note 1: There are two type of screws on SC/SN/SS PCB:
TC-P46S30 0 7 0 0 7 5 2 2 23 Mounting and Signal/Floating Ground
TC-P46ST30 0 7 0 0 7 5 2 2 23
TC-P50GT30 2 5 0 0 7 4 2 2 22 Note 2: Mounting screws have to be replaced.
TC-P50S30 0 7 0 0 7 5 2 2 23 Signal/Floating Ground screws have to be
TC-P50ST30 0 7 0 0 7 5 2 2 23 re-tightened
TC-P55GT30 2 5 0 4 7 4 2 2 26
TC-P55VT30 2 5 0 4 7 4 2 2 26 Note 3: Some boards may have arcing marks in screw area.
TC-P55ST30 0 7 0 0 7 7 2 2 25 Refer to page 2 for cleaning method before the
TC-P60GT30 2 5 4 4 9 7 3 3 37 screws are tightened.
TC-P60S30 2 7 4 4 9 7 3 3 39
TC-P60ST30 2 7 4 4 9 7 3 3 39 Note 4: Refer to page 3 ~ 6 for screw
TC-P65GT30 2 5 4 4 9 7 3 3 37 identification on the board
TC-P65ST30 2 5 4 4 9 7 3 3 37
TC-P65VT30 2 5 4 4 9 7 3 3 37
2012 SS2 Pmain Psub SC/SN SS SU SD Total
TC-50PU54 0 5 0 6 5 2 2 20
TC-60PUT54 0 6 0 8 6 3 3 26
TC-P42UT50 0 5 0 6 4 0 0 15
TC-P50ST50 2 6 0 8 4 2 2 24
TC-P50GT50 2 6 0 8 4 2 2 24
TC-P50U50 0 5 0 6 5 2 2 20
TC-P50UT50 0 4 0 6 5 2 2 19
TC-P55GT50 2 6 0 8 4 2 2 24
TC-P55ST50 2 6 0 8 4 2 2 24
TC-P55UT50 0 6 0 6 5 2 2 21
TC-P55VT50 2 2 0 8 4 2 2 20
TC-P60GT50 2 6 4 10 7 3 3 35
TC-P60ST50 2 6 0 10 7 3 3 31
TC-P60U50 2 5 0 8 6 3 3 27
TC-P60UT50 0 6 0 8 6 3 3 26
TC-P65GT50 2 6 4 10 7 3 3 35
TC-P65ST50 2 6 0 10 7 3 3 31
TC-P65VT50 2 6 4 10 7 3 3 35
