LG FFH-3765MVA Service Manual page 19

IC301 Troubleshooting
Is power supplied to IC301 Pin 18, 46, 72 ?
YES
Check the "5V" of IC301 Pin 11
YES
Is oscillation of X301 normal ?
YES
Is power supplied to IC301 Pin 12 ?
© High)
(Low
YES
Replace the IC301
IC552, 203 Troubleshooting
Is Power supplied to IC552, 203 Pin 16 ?
YES
Check the CLK Data of IC552, 203 Pin 2, 3
YES
Check the CONTROLL function
YES
END
NO
NO
NO
NO
NO
NO
NO
Replace the
IC552 or 203
- 2-13 -
Refer to "Power Circuit Troubleshooting"
Check the P-SENS
Replace the X301
Check the RESET circuit
Refer to "Power Circuit Troubleshooting"
Check the Data of IC301 Pin 3, 4, 5
(CD. TAPE FUNCTION)
Check the pattern
(IC301, IC552/203)