LG LM-K3960A Service Manual page 12

I PWM ALTERATION PART CHECK
P7905 9PIN 3.3V check
YES
IC604 PS9829 VDD PIN
Power check
(3.10.22.29.39.47.56.65.72.
87. 94)
YES
X601 12.288MHz operation
check
YES
IC604 PS9829
86 PIN CLK input check
YES
IC100 78KOKF2
21 © PWM_CLK
22 © PWM_DATA
23 © PWM_REST
output check
YES
IC604 PS9829 DATA input
check
78 PIN © DATA
79 PIN © CLK
96 PIN © REST
YES
PWM MODULATOR output
check
FL:75(+)74(-)FR:71(+)70(-)
SW:68(+)67(-)CEN:62(+)61
(-) SL:59(+)58(-)SR:52(+)51(-)
YES
normal
NO
Refer to SMPS
Troubleshooting
NO
relevant parts check X604
12.288MHz
YES
normal
NO
R668(470Ω) output check
YES
normal
NO
LINE resistance check
DATA:R671 CLK:R670
RST:R665
YES
normal
NO DVD ASS`Y PS9829 commu-
nication status check(P7403)
YES
IC604 PS9829 DATA input check
YES
normal
NO
IC604 PS9829 parts check
- 2-5 -
NO
relevant parts
replacement
NO
relevant parts
replacement
NO
relevant parts
replacement
Refer to DVD
NO
Troubleshooting
NO
Check each line
resistance check