Dell E173FP service manual PWPC1742LGD1

			DELL E173FP Service Manual
5.3.2Power Block Diagram
PWPC1742LGD1
Function test
		CON205
		1
		2		CN102
				1	ON/OFF
				2
	R8			3	DIM
		CON206
	CCFL			5
		1			12V
				6
				7
		2		8	5V
				9
		M4		10
R6	R9			11	GND
				12			M2			M1
CCFL	10	Vrms METER V	Model name :	GND	R2	V		R1	V
							METER V			METER V
					5			100
R7	M3		PWPC1742LGD1
10	Vrms METER V
		CON207	PCB
			NO.715L1283-1
		1
		2
	R12							R4
	CCFL	CON208						560
		1
		2
R10	R13	M6		GND				VR1
CCFL
	10	Vrms METER V						10K
			L	N
R11	M5			CN901				R5
10	Vrms METER V							100
				AC IN

Function test step :

Step1 :

1.Adjust VR1 ( Set Vdim voltage from 0V to 5V) , then check M3 / M4/M5/M6 Vrms .

2.Check M3 / M4/M5/M6operating frequency. (

note 1 )

Note 1: M3 / M4/M5/M6 need to use two channel multimeter , such as FLUKE 45 , or use the oscilloscope check frequency.

Specification :

M1 = 12V +- 0.5V , M2 = 5V +- 0.25V

1.M3 / M4/M5/M6 = 6.5 +- 5 mV @ DIM= 5V

M3 / M4 /M5/M6= 3.0 +- 5 mV @ DIM= 0V

2.M3 / M4/M5/M6= 55KHz +- 5 KHz

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