Dell E173FP service manual Trouble Shooting Main Board No display

		DELL E173FP Service Manual
8.2 Trouble Shooting
8.2.1 Main Board
1) No display
		Check Power board, is there DC level output?. Check
Measured CN104 pin 5 = 5 V?	No DC Level	U105 pin3=5V, P105 pin2=3.3V? Is there any
Measured U101 pin44=5V?		shortage or cold solder or PCB trace is disconnected?
Measured U105 pin 2= 3.3V?		Check Correspondent component

Yes, all DC level exist						Yes. There have OSD show
											LED Green
	Disconnected the Signal cable (Loose the						Connected the Signal cable again,
	Signal cable), Is the screen show Block						Check LED status.
	WRGB color bars?
No, nothing is show			Led Orange			Check Power switch is in				Replace U102
						Power-on status, and check if				Scalar IC
	Connected the Signal cable again,							Led orange
						Power switch had been stuck?
	Check LED status.
				OK, Keyboard no stuck
		Led Green							Check Correspondent
									component short/open
					Measured RGB (R112, R114) H, V Input
Check the Wire-Harness from CN101									Protection Diode and
					at U102 pin 95, 96, was there have signal?			NG
									Signal cable bad?
		OK, Wire tight enough

Check Panel-Power Circuit Block

OK, input Normal

OK, Panel Power

Check U200 Data-output Block

OK, U102 data OK

Replace Inverter board and Check Inverter control relative

Measured Crystal X101

OK, clock normal

Replace U102 (GMZan3SL)

Re-do White balance

OK

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”

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