Replacement Of Switching Regulator Ic (Ic5701) - Panasonic SA-PT170PH Service Manual

Caution: During assembling procedures, ensure the SMPS
P.C.B. is seated properly at the locators.
9.18. Replacement of Switching Reg-
ulator IC (IC5701)
9.18.1. Disassembly of Switching Regula-
tor IC (IC5701)
• Follow (Step 1) to (Step 3) of Item 9.3.
• Follow (Step 1) to (Step 3) of Item 9.6.
• Follow (Step 7) to (Step 10) of Item 9.6.
• Follow (Step 4) to (Step 6) of Item 9.12.
• Follow (Step 1) to (Step 9) of Item 9.17.
Step 1 Desolder pins of the Switching Regulator IC (IC5701) on
the solder side of SMPS P.C.B.
Step 2 Remove 1 screw from the Switching Regulator IC
(IC5701).
Step 3 Remove the Switching Regulator IC (IC5701) from the
heatsink unit B.
Caution: During replacement of the part, avoid touching
the heatsink. It may lead to injury.
Note: Refer to the diagrams of SMPS P.C.B. (Item 18.5.) for
location of the part.
9.18.2. Assembly of Switching Regulator
IC (IC5701)
Step 1 Apply grease to the heatsink unit B.
Caution: Ensure pins of the Switching Regulator IC
(IC5701) are properly seated and soldered on SMPS P.C.B.
Step 2 Mount the Switching Regulator IC (IC5701) to the
SMPS P.C.B.
Step 3 Fix and screw the Switching Regulator IC (IC5701) to
the heatsink unit B.
62