Samsung DP15HS/HT Service Manual page 31

5-2-4 Visible Retrace
Check white balance adjustment.
Is G2 voltage right?
Yes
Is blank pulse on Pin 17 of IC401?
Yes
Is V_FLB pulse on
23
Collector of Q303?
Yes
Does approve the Vertical pulse
24
on the CRT Socket G1?
Yes
Done
DP15H*/DP17L*
No
Check D502, D503, Q501 and Adjust
G2.
No
Check IC401.
No
Check Q303.
No
Check CN102, CN201.
5 Troubleshooting
WAVEFORMS
23 5.00 V (Q303, Collector)
CH1 P-P = 5.00V CH1 RMS = 28.33V
24 20.00 V (CRT, G1)
CH1 P-P = 20.0V CH1 RMS = 66.68V
5-15