Poor Focus; Sound (Option For Audio Model Only); Abnormal Video Level On Screen - Tatung VM9G5DA S995T Service Manual

READJUST FOCUS CONTROL
NG
6-10 NO SOUND (OPTION FOR AUDIO MODEL ONLY)
ADJUST VOLUME CONTROL
OK
ENSURE THE SOUND SOURCE
IS POWER ON
ENSURE THE SOURCE CABLE
CONNECTION
CHECK THE VOLTAGE OF IC801
PIN 6, 9, 22 ABOUT 12V
OK
NG
OK
CHECK THE SIGNAL INPUT OF
R.G.B. ABOUT 0.7Vpp
OK
CHECK IC801 PIN 15\PIN16
CLAMP PULSE ABOUT 5Vpp.
NG
OK
CHECK THE VIDEO OUTPUT OF
IC801 PIN 18, 20, 23 ABOUT 4Vpp
CONTRAST SET MAX.
R.G.B. APPROACH STANDARD

6-9 POOR FOCUS

NG
NG

6-11 ABNORMAL VIDEO LEVEL ON SCREEN

NG
NG
CHECK FOCUS CONTROL UNIT,FOCUS
LEAD WIRE, CRT SOCKET & CRT
CHECK IC501
PIN 14 ABOUT 14V
NG
OK
CHECK IC501
OK
SPEAKER FAILURE
CHECK 12V RELATIVE CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK IC501RELATIVE CKT OR
IC401 PIN 16 OUTPUT
CHECK IC801 PIN 13 ABOUT 4V
PIN 26, 27, 28 ABOUT 4V OR
CHECK Q801 CKT.
CHECK POWER
SUPPLY CIRCUIT
IC501 FAILURE