Trouble Shooting - AOC 511Vwb Service Manual

15" LCD Color Monitor

8.2 Trouble Shooting

8.2.1 MAIN BOARD
NO SCREEN APPEAR
Measured CN501 pin1、2、3 = 12 V?
Measured U501 pin 2= 5V?
Measured U503 pin 2= 3.3V?
Yes, all DC level exist
Disconnected the Signal cable( Loose the
Signal cable ),Is the screen show "Cable Not
Connected" ?
No, nothing is
Connected the Signal cable
again
Led Green
Check the Wire-Harness from CN401
Check Panel-Power Circuit Block
Check U401 Data-output Block
Replace Power board and Check
Inverter control relative circuit
Re-do White balance adjust
Note:1. If replace "MAIN-BOARD" , Please re-do "DDC-content" programmed & "WHITE-Balance".
Yes .there have OSD show
Led Orange
Check Power switch is in Power-on
status , and check if Power switch had
been stuck ?
OK, Keyboard no stuck
OK, Wire tight enough
OK ,Panel Power OK
OK, U401 data OK
NG
Check Correspondent component.
Is there any shortage or cold solder?
Connected the Signal cable again,
Check LED status.
Measured RGB (R405, R406, R407 )
H,V Input at U401 pin 8,9 ,was there
have signal ?
Check digital signal from CN201
OK, input Normal
NG, still no screen
Replace U401 ((RTD2025L)
OK
27
AOC 511Vwb
Led orange
Check Correspondent
component short/open
( Protection Diode )
OK, clock
Led Green
Replace U101
Flash Rom
NG