10. Function Trouble
10. Function Troubleshooting (AV,
(AV,YPBPR))
CVBS
N Si
l
YPbPr No Signal
/ Color Fade
Check if C58
Check if the
No Signal
Y
N
Check if
U16_PIN4,7,9
have signals?
Check if the 5V power
supply of U13_PIN16
and control signal of
PIN1
l?
N
Check if C58
and R59 are
OK?
CVBS signal
of U1_PIN181
is normal?
Check
Change C58
and R59
Y
N
Check if
U1_PIN157
~
161 have
Check if
U16_PIN2,5,
Y
N
have signals?
PIN1 are normal?
Y
Y
N
Change U1
U6_PIN92
161 have
signals?
11 have
signals?
Check if
D9,C146,C14
9,R144,R145
and R150 are
O ?
Y
Y
N
N
Check the circuit
between
U16_PIN4,7,9
and
U1 PIN157
~
161
Y
N
Check
C74 and
R63
OK?
Ch
CN22
Change the
d f
ti
Check the
circuit between
CN9 and U16
Change CN9
U1_PIN157
161
Change CN22
defective
components
第 54 页,共 57 页
Содержание STV-22LED3
Страница 1: ...SERVICE MANUAL STV 22LED3 STV 24LED3 第 1 页 共 57 页 ...
Страница 30: ...9 Housing ASSEMBLY DRAWING 结构尺寸 第 30 页 共 57 页 ...
Страница 31: ...系列 公司名称 东莞乐科电子有限公司 机种名称 拟制 日期 审核 尺寸 版本 批准 第 31 页 共 57 页 ...
Страница 55: ...STV 22LED3 Line Diagram 第 55 页 共 57 页 ...
Страница 56: ...STV 24LED3 Line Diagram 第 56 页 共 57 页 ...