Samsung DP15HS/HT Service Manual page 24

5 Troubleshooting
5-1-15 Dynamic Focus Failure
IC401 Pin 32 output is right?
12
Yes
Some parts around Q551 are right?
Yes
T502 Pin 6 input is right?
13
Yes
T502 Pin 1 output is right?
14
No
Check the connection between FBT
Focus pin, CRT Socket PCB.
5-8
No
Replace the IC401.
No
Replace failed part.
No
Check and replace C432.
No
Replace the T502.
WAVEFORMS
12 2.00 V (IC401, #32)
CH1 P-P = 2.00V CH1 RMS = 6.124V
13 50.0 V (T502, #6)
CH1 P-P = 50.0V CH1 RMS = 75.6V
14 100 V (T502, #1)
CH1 P-P = 100V CH1 RMS = 124.0V
DP15H*/DP17L*