14
6. TROUBLE SHOOTING CHART
6.1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
NG
CHECK THE HIGE VOLTAGE OF CRT
ABOUT 24.5~25.5V
CHECK LOWER POWER CIRCUIT H-
SYNC
,
V-SYNC SIGNAL Q909
,
Q910
CHECK MAIN PCB POWER SUPPLY
76V
、
14.2V
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
CHECK FAILSAFE CKT IC401 PIN2
RELATIVE CKT.
REFER ITEM S.M.P.S
OK
NG
OK
CHECK CRT
’
S HEATER RELATIVE
CIRCUIT D923
CHECK SCREEN VOLTAGE ABOUT
500V TO 700V
BRIGHTNESS SET TO MAX
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 40Vpp
CHECK FBT
LESS THAN 300V
CHECK G1 CIRCUIT Q705
RELATIVE CKT
REFER ITEM 6-2 “ABNORMAL
DISPLAY”
NG
NG
NG
OK
OK
OK
OK
http://jdwxzlw.5d6d.com/?fromuser=华盛维修
家电维修资料网,免费下载各种维修资料
Summary of Contents for 105G7
Page 44: ...43 IC401 TDA4841 IC601 TDA4863A http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 45: ...44 IC801 LM1237 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 46: ...45 IC802 LM2469 IC803 LM2480NA http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 47: ...46 10 PCB LAYOUT 10 1 MAIN PCB LAYOUT http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 48: ...47 10 2 CRT BOARD LAYOUT http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 49: ...48 11 SCHEMATIC DIAGRAM http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 50: ...49 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 51: ...50 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Page 52: ...51 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...