Trouble Shooting Flow Chart - ViewSonic VX715 Service Manual

6. Trouble Shooting Flow Chart

6.1 No Display On Screen
Measured CN103 pin5 /6= 12 V?
Measured CN103 pin 9/10= 5V?
Measured power supply of IC101 3.3V,
2.5V?
Disconnected the Signal cable (Loose the Signal
cable), Is the screen show "Cable Not
Connected"?
Connected the Signal cable
again Check LED status.
Green
Check the Wire-Harness from CN106
OK, Wire tight enough
Check Panel-Power Circuit Block
OK
Check U102 Data-output Block
OK
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".
2. If replace "Power Board" only, Please re-do " White-Balance"
ViewSonic Corporation
OK
NG
Orange
Check Power switch is in Power-on
status, and check if Power switch had
been stuck?
OK, Keyboard no stuck
.
NG
Check Correspondent component.
Is there any shortage or cold solder?
OK
Connected the Signal cable again,
Check LED status.
Measured RGB (C152, C145, C135)
H/V Input at IC101 pin 42,43, Was
there have signal?
OK
Measured Crystal
OK
Replace IC102 (RTD2523)
OK
28
Orange
Check Correspondent
component short/open
(Protection Diode)
Green
Check Inverter
control relative
circuit
NG