Sharp 21L-FG1SA - NO SOUND; NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION; DEFECTIVE VERTICAL AMP. AND VERTICAL LINEARITY; NO VERTICAL SCAN

21L-FG1SA/SF/SM/RU
5 – 2
TROUBLE SHOOTING FLOWCHART (Continued)
Does signal appear at pins
(13) and (20) of IC3502 ?
NO SOUND
CIRCUITS TO BE CHECKED:
Sound Detector Circuit.
Sound Switch and Att.
Control.
Audio Output Circuit.
Does signal appear at pins
(6) and (8) of IC301 ?
Check TV sound from pin (47)
of IC801.
Check Speaker.
Check IC301 and
peripheral circuit.
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
Sync. Separator Circuit.
Check pins(11), (15) and
(16) of IC801.
Vertical linearity and size are
abnormal.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Re-adjust vertical size.
(Bus Data)
Check R503, R506, R513,
R520 and C515.
NO VERTICAL SCAN
Check IC501.Check C511.
Check IC501 bias.