Samsung DP14LS Service Manual page 40

6-2-17 Micom Failure Continued
Are H/V sync input on
24 25
IC201's Pins 30 and 31?
Yes
Check signal cable.
Yes
Check D202, D203.
Yes
Check PCB pattern to Pins 30 and 31.
WAVEFORMS
24 5.28 V (IC201, #31)
CH1 P-P = 5.28 V CH1 RMS = 1.218 V
DP14L*/DP15L*
Yes
Check PCB pattern to IC401's
25 4.96 V (IC201, #30)
CH1 P-P = 4.96 V CH1 RMS = 350 mV
When disconnecting signal
cable: Is 0V on IC201's Pin 19?
When connecting signal cable:
Is 5V on IC201's Pin 19?
Yes
Sus (Pin 5) : 5 V,
Off (Pin 6) : 5 V?
Pins 1 and 2.
Yes
Replace IC201.
26 5.48 V (IC401, #1)
CH1 P-P = 5.48 V CH1 RMS = 1.362 V
No
Yes
LED is ok?
No
Replace LED.
Are H/V sync input from
No
IC201 on IC401's
26 27
Pins 1 and 2?
Refer to 6-2-13 I
27 4.48 V (IC401, #2)
CH1 P-P = 4.48 V CH1 RMS = 284 mV
6 Troubleshooting
Cceck and replace
IC201, R226
Signal cable.
Yes
Yes
2
C Failure.
6-21