Service manual

52
13VT-R100/R150
13VT-CR10
NO
FLOW CHART NO.2-3
FLOW CHART NO.2-4
No picture, no sound
YES YES YES
YES
YES YES YES
Check the IC401 and adjacent parts.
Check the IC401 and adjacent parts.
Check the Q404
and adjacent parts.
Check the CRT connector K1 until K6 and adjacent parts. Check bias at pin (22) of IC401.
Check bias at IC501.
Check D502, C509, C510 and R511.
Check vertical frequency.
Check CF631 (503kHz).
Normal
Abnormal
Check IC401.
Abnormal Abnormal
Normal Normal
NO
NO
NO
NO
NO
NO
No vertical scan
Circuit to be checked: 1. Tuner 2. PIF 3. Automatic gain control. 4. 9V power source.
Check the IC401 and adjacent parts.
Check IC2001.
Check the tuner AGC.
Check the IC351.
Does the noise level increase when Contrast, Brightness and Sound Control at max?
Is there a signal at pin (43) of IC401?
Noise increases but no signal is received.
Is there a signal at pin (53) of IC401?
Picture noise decrease but sound level varies greatly.
Check the tuner bias.
Normal
Abnormal
Abnormal
Check IC401.
Normal
Check the tuner circuit.
Abnormal
Check the PC9V line.
Normal
Check IC401.
Does appear at pin (48) of IC401?
Is there a signal at pin (37) of IC401?
Is there a signal at pin (53) of IC401?
Is there a signal at pin (2) of IC351?
Is there a signal at pins (6) and (8) of IC351?
Check the speaker.
Check the IC401 and adjacent parts.
Is there a signal at pin (2) of IC351?
PICTURE & SOUND TROUBLESHOOTING
VERTICAL SCAN TROUBLESHOOTING