Service Manual
47
Change U105
4.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?
NO
Is the on-off control signal #109 of U105
high-low convertible when DC on/off
NO
Yes
Is the
voltage
16V at T1
PIN4?
Check
T850 or
F850
NO
Yes
Yes
Check U1
pin6 Voltage
is 5V
Yes
Check U1 pin1
Voltage is
lower
Check
Q3
NO
YES
Check T1 pin7 and pin10 Open or
Short
Change T1
Yes
Summary of Contents for 2209WA - UltraSharp - 22" LCD Monitor
Page 1: ...Service Manual 0 Service Manual LCD Monitor 2209WA ...
Page 25: ...Service Manual 24 8 Key Parts Pin Assignments 8 1 U105 TSUMU58EHJ LF ...
Page 26: ...Service Manual 25 ...
Page 27: ...Service Manual 26 ...
Page 31: ...Service Manual 30 ...
Page 32: ...Service Manual 31 Chapter 4 Disassembly Assembly 1 Exploded Diagram ...
Page 36: ...Service Manual 35 Note 1 The arrows point out the direction of assembly ...
Page 44: ...Service Manual 43 ...
Page 80: ...Service Manual 79 ...
Page 82: ...Service Manual 81 Main board Top Layer ...
Page 83: ...Service Manual 82 Bottom Layer ...
Page 84: ...Service Manual 83 Keypad USB convert board ...
Page 85: ...Service Manual 84 ...