Samsung DP14LS Service Manual page 25

6 Troubleshooting
6-2 Detail Repair Section
Notes: 1. If a picture does not appear
check first
6-2-1 No Power
Check and replace D406, D407, D408,
IC101, Q402, Q410, Q504
Does recitfied voltages of
secondary part appear on C620,
C622, C623, C624, C630?
No
Are D608 ~ D612 OK?
Yes
Does rectified voltage
(1.4 x AC input) of primary part
appear on C607?
Yes
Is IC601's Pin 1 OK?
1
Yes
Is IC601's Pin 5 OK?
2
Yes
Check and Replace
IC601, T601.
WAVEFORMS
1 410 V (IC601, #1)
CH1 P-P = 410 V CH1 RMS = 332.8 V
6-6
• if AC power cord is plugged or not,
• if signal cable is connected or not,
• if signal generator (PC) is operated well or not (DPMS mode)
• if the Timing mode is out of spec or not (14": 30~55 kHz, 15": 30~61 kHz)
Yes
No
No
No
No
Check and replace D602, D603, D607,
2 8.40 V (IC601, #5)
CH1 P-P = 8.40 V CH1 RMS = 4.680 V
Refer to 6-2-3 No Raster and
6-2-12 High Voltage Failure.
Replace it.
Check and replace
D601~D607, FH601, TH602.
Check and replace IC601, T601.
IC601, T602.
No
Desolder IC601's Pin 1.
Does rectified voltage
(1.4 x AC input) of primary
part appear on C617?
Yes
Check and replace T601 and
around parts.
DP14L*/DP15L*
No