LG LST-5600A Service Manual page 14

(A) Power check
YES
2.5V is supplied to L101?
YES
3.3V is supplied to IC104(37), IC105(37),
IC102(1), IC103(1), and IC201(3)?
YES
3.3V is supplied to IC106(14)?
(B) Clock check
YES
25MHz clock is output from X101(3)?
Fig.01
YES
37.5MHz clock is input to IC201(87)?
Fig.02
YES
3.6864MHz clock is output from X102(3)?
Fig.03
NO
NO
NO
NO
NO
NO
3-5
Power Supply Check
IC954(3) : 2.5V
Power Supply Check
IC950(2) : 3.3V
Power Supply Check
IC950(2) : 3.3V
Check X101
Check IC101 & IC201
Check X102