Troubleshooting - Samsung CA17K Series Service Manual

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
Check and replace D601 and FH1
Chirping noise exists?
No
Repeating start?
No
IC601 Pin 1 waveform is right?
1
Yes
C622 Voltage is 13 V ± 0.5V?
Yes
Operate normally?
Yes
Verify voltages.
Done.
CA17K*/CA17J*
Yes
Check and replace IC601.
Yes
Check and replace D606.
No
Check and replace D614, IC601,
Q602, and ZD601.
No
Check and replace IC201, IC301,
IC401, Q402, and Q404.
No
Replace Main board.
CONFIDENTIAL
WAVEFORMS
100 V (IC601, #1)
1
CH1 P-P = 100 V CH1 RMS = 350.2 V
5-1