Samsung PN17K Series, Service Manual, Page: 19 / 66

PN17K*/PN17J* 5-1
5 Troubleshooting
5-1 Parts Level Troubleshooting
Notes: Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
5-1-1 No Power Supply
Chirping noise exists?
Check and replace IC601.
Check and replace D601 and FH1
Done.
No
Yes
Repeating start?
Check and replace D606.
No
Yes
IC601 Pin 1 waveform is right?
Check and replace D614, IC601,
Q602, and ZD601.
Yes
No
C622 Voltage is 13 V ± 0.5V?
Check and replace IC201, IC301,
IC401, Q402, and Q404.
Yes
No
Operate normally?
Replace Main board.
Yes
Verify voltages.
No
WAVEFORMS
1
1 100 V (IC601, #1)
CH1 P-P = 100 V CH1 RMS = 350.2 V