Dell E152FPc, Руководство по обслуживанию

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DELL E152FPc
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8.2 TROUBLE SHOOTING
8.2.1 MAIN BOARD
1.NO SCREEN APPEAR
Note: 1. If Replace “ MAIN-BOARD ”, Please re-do “DDC-content” programmed & “WHITE-Balance”.
2. If Replace “ Inverter Board ” only, Please re-do “ WHITE-Balance”
Yes, all DC level exist
No DC Level
Measured U402 pin 3 = 5 V?
Measured U402 pin 2= 3.3V?
Measured U401pin 2 =1.8V?
Check Power board, is there DC level output?
Check Correspondent component.
Is there any shortage or cold solder?
Check Power Board.
Yes. there have OSD show
Disconnected the Signal cable (Loose the
Signal cable), Is the screen show Block
WRGB color bars?
Connected the Signal cable again,
Check LED status.
Led Green
Replace U200
Scalar IC
No, nothing is show
Connected the Signal cable again,
Check LED status.
Check Power switch is in Power-on
status, and check if Power switch
had been stuck?
Led Orange
OK, Keyboard no stuck
Led orange
Led Green
Check the Wire-Harness from CN301
Measured RGB (R116, R106, R111) H, V
Input at U200 pin 85,86, was there have
signal?
Check Correspondent
component short/open
(Protection Diode)
and Signal cable bad ?
NG
OK, Wire tight enough
Check Panel-Power Circuit Block
OK, Panel Power OK
Check U200 Data-output Block
OK, U200 data OK
Replace Inverter board and Check
Inverter control relative circuit
Re-do White balance adjust
OK, input Normal
Measured Crystal X200 (12.00MHz)
OK, clock normal
Replace U200 (GMZan3)
OK