Trouble Shooting - Dell E153FPc Service Manual

9.2 Trouble shooting

9.2.1 Main Board
No Display
Measured CN104 pin5 = 5 V?
Measured U101 pin 44= 5V?
Measured U105 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.
Green
Check the Wire-Harness from CN101
Check Panel-Power Circuit Block
Check U200 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"
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OK
NG
Check Power switch is in Power-on
Orange
status, and check if Power switch had
been stuck?
OK, Keyboard no stuck
OK, Wire tight
enough
OK, Panel Power OK
OK, U102 data OK
u5[Pb€ g /• D e™ • Q
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 (R112, R114,)
H/V Input at U102 pin 95,96,
Was there have signal?
OK
Measured Crystal X101
OK
Replace U102 (ZAN3XL)
OK
36
Dell E153FPc
Green
ReplaceU102
Scalar IC
Orange
Check
Correspondent
component
short/open
(Protection Diode)
NG