Service Manual
32
Is the frequency 14.318MHz at
#32
of IF Board U104?
NO
Power (include IF +5Vand +3.3V) supply normal, key function OK,but backlight
can’t be turned on
Backlight cannot be turned on,is the
on-off control signal come from IF ok?
Is the CN853
inserted CN103 OK?
NO
Yes
Is the on-off control signal #20 of U104
high-low convertible when DC on/off
NO
Yes
Is the low active reset signal at #19 of
IF Board U104 normal?
NO
Change
C160
Yes
Is the serial clock signal at #6 of IF
Board U105 normal when power AC
Change
U105
NO
Upgrade Firmware to Serial Flash U105
by VGA port with ISP_Tool
V4.100.exe,after this process,no the
control signal yet,change U104
Yes
Change
X101
Yes
Is the
voltage
16V at T1
PIN4?
Check
T850,
D854
NO
Yes
Yes
Check U1
pin4 Voltage
is 2V
Yes
Check U1 pin8
Voltage is high
Check
Q1 or
Q2
NO
YES
Check T1/T2 pin7 and pin10 Open
or Short
Change T1/T2
Yes
Содержание 320-7459 - S1909WXF - 19" LCD Monitor
Страница 1: ...Service Manual 0 Service Manual LCD Monitor S1909WXf ...
Страница 16: ...Service Manual 15 8 Key Parts Pin Assignments 8 1U104 TSUM56BWHK LF 2 ...
Страница 17: ...Service Manual 16 ...
Страница 18: ...Service Manual 17 ...
Страница 53: ...Service Manual 52 Attachment 3 PCB Layout power inverter bd Power inverter bd Top Layer ...
Страница 54: ...Service Manual 53 Bottom Layer ...
Страница 55: ...Service Manual 54 I F board Top Layer ...
Страница 56: ...Service Manual 55 Bottom Layer ...
Страница 57: ...Service Manual 56 Keypad Top Layer Power key Top Layer Bottom Layer ...