Main Board - BenQ PB6100 Service Manual

Main board

System no work
No
No data
No
No im age when graphics
is the current input
No
No im age when video
is the current input
No
Unable to download
No
Unable to save
O SD setting
No
Keypad
m alfunction
No
1.chk voltage input from F/B : 2.5V,5V,12V
2.chk oscillator Y2,Y3 output frequency (16.257MHz,10MHz)
3.chk MCLK(U24-5,130MHz) and DCLK(U25-5,40MHz)
4.chk U17 whether S/W inside or bad soldering
5.change U22(bad soldering)
Yes
6.chk Reset IC (U14)
7.chk Abnorm al signal
8.chk Resetz(RN25-5),Poweron(RN25-6) ,DVS(RN18-3),DEN(RN18-
1),DHS(RN18-2),DCLK(RN18-4)
1.chk output from U15(RN6,RN7,RN8,RN9,RN10,RN11) [graphics input]
2.chk output from U13 (Via VUV[0:7}&VY{0:7]) [video input]
Yes
3.chk U22 and its peripherals (as above block)
1.chk D_SUB cable and L9
2.chk GHS(UH2-4),GVS(UH702-4)
3.chk U15 voltage source U12(3.3V),UB16(3.3V)
4.chk U15 GHS(64),GVS(63),GFBK(65),G CLK(66)
Yes
5.chk U15 soldering
6.change U15
1.chk U13 voltage source U12,UA6
4.chk Y1 output frequency(24.576MHz)
5.chk U13 output signals to U22
Yes
6.chk U13 soldering
7.chagne U13
1.change U17
Yes
2.chk U711 enable pins(1,4)
Yes
1.change U21
1.chk RN725-RN728 soldering
2.chk U27,U28
Yes
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