Trouble Shooting - Dell E153FPTc Service Manual

9.2 Trouble shooting

9.2.1 Main Board
No Screen
Measured CN104 pin5 = 5 V?
Measured U101 pin 44= 5V?
Measured U1
5 pin 2= 3.3V?
Disconnected the Signal cable (Loose the
Signal cable), Is the screen show Block
WRGB color bars?
Connected the Signal
cable again Check LED
status.
Check the Wire-Harness from CN103
Check Panel-Power Circuit Block
Check U102 Data-output Block
Replace Inverter 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"
OK
NG
Check Power switch is in Power-on
Orange
status, and check if Power switch had
been stuck?
OK, Keyboard no stuck
Green
OK, Wire tight
enoug
Lamp
OK, Panel Power OK
OK, U102 data OK
Check Power board; is there DC level output?
NG
Check U105 pin3=5V, U105 pin2=3.3V?
Is there any shortage or cold solder?
OK
Connected the Signal cable again,
check LED status.
Measured RGB (R101, R104,
R105) H/V Input at U102 pin
95,96, Was there have signal?
OK
Measured Crystal X101
OK
Replace U102 (ZAN3XL)
OK
39
DELL E153FPTc
Green
Replace U102
Scalar IC
Orange
Check
Correspondent
component
short/open
(Protection Diode)
NG