Version 1.0 Page 7 of 19
Service Guide
1.2.2 No sound
Problem
Analyze and
identify the
causes
]
Solutions
No sound
PCB
short-circuited, dry
soldered or
broken;
LO RO IN SW-S2.1 200 ANDJ1
in SW-S2.1 200 AMP is not
properly connected
Repair or replace
Repair or replace
Or caused by the following defective
components
1. U1, U2 in SW-S2.1 200 AMP PCB
2. VR1
，
J1
，
in SW-S2.1 200 AMP
PCB
Repair, resolder or
replace
SW-S2.1 200
