Dell E173FP User Manual

Page 29

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DELL E173FP Service Manual

29

8.2 Trouble Shooting
8.2.1 Main Board
1) No display


































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”

No DC Level

Check Power board, is there DC level output?. Check

U105 pin3=5V, P105 pin2=3.3V? Is there any

shortage or cold solder or PCB trace is disconnected?

Check Correspondent component

Yes. There have OSD show

Connected the Signal cable again,

Check LED status.

LED Green

Replace U102

Scalar IC

Check Power switch is in

Power-on status, and check if

Power switch had been stuck?

Led Orange

OK, Keyboard no stuck

Led orange

Measured RGB (R112, R114) H, V Input

at U102 pin 95, 96, was there have signal?

Check Correspondent

component short/open

Protection Diode and

Signal cable bad?

NG

OK, U102 data OK

Replace Inverter board and

Check Inverter control relative

Re-do White balance

Measured CN104 pin 5 = 5 V?

Measured U101 pin44=5V?

Measured U105 pin 2= 3.3V?

Yes, all DC level exist

Disconnected the Signal cable (Loose the

Signal cable), Is the screen show Block

WRGB color bars?

No, nothing is show

Connected the Signal cable again,

Check LED status.

Led Green

Check the Wire-Harness from CN101

OK, Wire tight enough

Check Panel-Power Circuit Block

OK, Panel Power

Check U200 Data-output Block

OK, input Normal

Measured Crystal X101

OK, clock normal

Replace U102 (GMZan3SL)

OK

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