14
6.TROUBLE SHOOTING CHART
6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
BRIGHTNESS SET TO MAX. THEN
CHECK CRT G1 VOL
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
CHECK THE HIGE VOLTAGE OF CRT
ABOUT 24 ~ 26KV
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK VOLTAGE OF THE CRT
CHECK BRIGHTNESS CIRCUIT
OK
CHECK POWER SAVING CIRCUIT,
H-SYNC, V-SYNC SIGNAL
Q909, Q910
"ABNORMAL DISPLAY"
CHECK SCREEN VOLTAGE ABOUT
LESS THAN 300V
CHECK FBT
CHECK MAIN PCB POWER SUPPLY
55V, 12V, 80V,-12.5V
CHECK FAILSAFE CKT IC401
PIN 25 RELATIVE CKT
.
CHECK CRT'S HEATER RELATIVE
CIRCUIT Q907, Q908
Q703, Q704, Q705 RELATIVE CKT.
400V TO 600V
REFER ITEM 6-2
CATHODE ABOUT 55V TO 65V
REFER ITEM S.M.P.S
Summary of Contents for E773c Series
Page 16: ...16 6 2 ABNORMAL DISPLAY 1 NO SIGNAL ON SCREEN ...
Page 21: ...21 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...
Page 38: ...38 9 BLOCK DIAGRAM IC801 NT6812K ...
Page 39: ...39 9 1 BLOCK DIAGRAM SMPS ...
Page 41: ...41 ...
Page 42: ...42 IC801 NT6812KG ...
Page 43: ...43 ...
Page 44: ...44 IC901 STR G5643D 1 2 3 4 5 D S GND VCC OCP FB ...
Page 45: ...45 11 PCB LAYOUT ...
Page 46: ...46 ...
Page 47: ... 47 12 CHEMATIC DIAGRA ...
Page 48: ...48 ...
Page 49: ...49 ...
Page 50: ...50 ...