LG LX-D2640 Service Manual page 12

IC301 Troubleshooting
C301 pin31, 32, 51, 88 power applied check
YES
IC301 pin6 PIN P-SENS "High" check
YES
X301 oscilates or not
YES
When IC301 pin92 voltage input. High©Low©High
YES
IC301 replacement
IC601 Troubleshooting
IC601 pin1 power check
YES
IC601 pin13, 14 CLK Data signal check
YES
IC601 FUNCTION SELECTIOR check
YES
normal operation
ON
Refer to power supply check
ON
P-SENS terminal check
ON
X301 replacement
ON
RESET circuit check
ON
Refer to power supply check
ON
IC301 pin13, 14 pin data check
(CD, TAPE FUNCTION replacement)
PATTERN check
ON
IC601 replacement
- 2-5 -
ON
YES
Refer to IC301 troubleshooting