14D1-SA/SF/GA/GF
14D2-SA/SF/GA/GF
Check IC801.
Check IC801 and its related circuit.Check Q251, Q252 and related circuit. Check pin (37)of IC801 and related circuit.
No snow noise.Check Q321, pins(4) and (6) of IC801 and peripheral circuit.
(Continued)
Does signal appear at pins(28) and (29) of IC801?
Does noise or pins (23) and (24)of IC801.
Does noise or signal appear at pin (40) of IC801 ?signal appear at
Does noise or signal appear at pin (38) of IC801 ?Check pin (1) of SF201 and Tuner related circuit. Check C356, C359 and peripheral circuit.
17-2
NO SOUND
Does the noise level increase at max. Contrast, Brightness and Sound controls ?
NO PICTURE, NO SOUND
Does noise signal appear at pin (44) of IC801 ?Does signal appear at pins (2) and (4) of IC302 ?Check P302,P303 connector of IC302 and peripheral circuit.
Check pin (27) of IC801, Tuner and related circuit.
Check the tuner AGC (TP201).
Noise increases but no signal is received.
TROUBLE SHOOTING FLOWCHART
Check pin(38) of IC801.
Check the tuner supply voltage LB must be approx. 5V. BT must be approx, 32V. And CH preset data check.
Tuner. PIF. Automatic Gain Control. (5V), (32V) Power Source. Sound system pins (28), (29) Sound Detector Circuit. Sound Switch and Att. Audio Output Circuit.
CIRCUITS TO BE CHECKED: EEEECIRCUITS TO BE CHECKED: E and (44) of IC801. EE Control. E
Checking the protector circuit.
Blown out.
Replace the fuse.
Check IC701, D701 and C705.
D1001 (Power LED Red brightly) turns on.D1001 (Power LED Red dimly) turns on or turns ON/OFF.
The fuse is again blown out.
Check IC801.
17-1
Check F701.
NO RASTERCheck C878.Does horizontal circuit oscillate ?Check CRT connector K1-K5 bias.Check Q752 and IC801.
Check Secondary Main+B (Approx. 130V)
Check T701 pin (11) voltage (Approx. 310V at 220V AC)
TROUBLE SHOOTING FLOWCHART
Check D751
Check R701 and R707Check R618 and R619.
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