BenQ PB6200 - Manual (Page 74)

74
Main board
System no work
No im age when graphics
is the current input
No im age when video
is the current input
Unable to download
Unable to save
O SD setting
Keypad
m alfunction
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
N o
No
No
No
N o data
1.chk RN725-R N728 soldering
2.chk U27,U28
1.change U21
1.change U17
2.chk U 711 enable pins(1,4)
1.chk D_SUB cable and L9
2.chk G HS(UH2-4),G VS(UH702-4)
3.chk U15 voltage source U12(3.3V),UB16(3.3V)
4.chk U15 G HS(64),G VS(63),G FBK(65),G CLK(66)
5.chk U15 soldering
6.change U15
1.chk voltage input from F/B : 2.5V,5V,12V
2.chk oscillator Y2,Y3 output frequency (16.257MHz,10MHz)
3.chk M CLK(U24-5,130MHz) and DCLK(U 25-5,40MH z)
4.chk U 17 whether S/W inside or bad soldering
5.change U22(bad soldering)
6.chk R eset IC (U14)
7.chk Abnorm al signal
8.chk R esetz(RN25-5),Poweron(RN25-6) ,DVS(RN18-3),DEN(RN18-
1),DHS(RN18-2),DCLK(R N18-4)
1.chk output from U15(RN6,RN 7,RN8,RN9,RN 10,RN11) [graphics input]
2.chk output from U13 (Via VUV[0:7}&VY{0:7]) [video input]
3.chk U22 and its peripherals (as above block)
1.chk U13 voltage source U12,UA6
4.chk Y1 output frequency(24.576MHz)
5.chk U13 output signals to U22
6.chk U13 soldering
7.chagne U13