Samsung DP14LS Service Manual page 32

6-2-10 Vertical Deflection Failure
Symptoms: – One horizontal line
– Rainbow color, No Video
Are +13 V, –12 V line OK?
Yes
Is V_out waveform on IC401's
9
Pin 23?
Yes
Is V_deflection waveform on
10
IC301's Pin 6?
Yes
2
Refer to 6-2-13 I
6-2-11 Invariable V_Size or V_Position
Key check (6-2-18)
Does V_Out (IC401's Pin 23) vary,
9
pressing V_Size or V_Posi key?
No
2
Refer to 6-2-13 I
DP14L*/DP15L*
No
No
No
C Failure.
Yes
C Failure.
Check and replace D608, D609,
IC301, IC302.
Is 8 V on IC401's Pin 21?
Yes
Check and replace IC401.
Check and replace IC301, R305, R306,
and some parts around it.
9
CH1 P-P = 3.16 V
Check and replace IC301 and some
parts around it.
No
Check and replace
R307, R308, IC401.
WAVEFORMS
3.16 V (IC401, #23) 10 50.8 V (IC301, #6)
CH1 RMS = 3.686 V CH1 P-P = 50.8 V
WAVEFORMS
9 3.16 V (IC401, #23)
CH1 P-P = 3.16 V
6 Troubleshooting
CH1 RMS = 7.04 V
CH1 RMS = 3.686 V
6-13