AOC
A20E221
14
4. TROUBLE SHOOTING CHART
4-1. Panel Control Circuit
No Display
Replace panel or FPC
cable to panel
Replace L118, C317
Check U300 crystal
X300 (12MHZ)
Replace X300
Check 2.5V L301-L304
3.3V L305-L308
Replace components
if it has problem
Replace U300
OK
OK
OK
OK
NG
NG
NG
NG
Check CN101 pin 42-45
is 5V and signal on pin
35,37,39,40,25-28,30-
33,15-18,20-23,5-8,10-13
Check U300 Output to
CN101 relative circuit
and CN101 VCC at
Q300, Q301, L309 (5V)
Summary of Contents for A20E221 Series
Page 13: ...AOC A20E221 13 The color temp is for you to adjust the color temperature to one you prefer ...
Page 15: ...AOC A20E221 15 4 2 Main Board Power Circuit 4 3 Remote Control Block ...
Page 16: ...AOC A20E221 16 4 4 Key Board Control Block ...
Page 17: ...AOC A20E221 17 4 5 PC Control Block ...
Page 18: ...AOC A20E221 18 ...
Page 19: ...AOC A20E221 19 4 6 Audio Control Block ...
Page 23: ...AOC A20E221 23 ...
Page 24: ...AOC A20E221 24 ...
Page 25: ...AOC A20E221 25 ...
Page 26: ...AOC A20E221 26 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...
Page 54: ...AOC A20E221 54 9 PCB LAYOUT 9 1 Main Board PCB Layout ...