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Main board
System no work
No image when graphics
is the current input
No image when video
is the current input
Unable to download
Unable to save
OSD setting
Keypad
malfunction
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No data
1.chk RN725-RN728 soldering
2.chk U27,U28
1.change U21
1.change U17
2.chk U711 enable pins(1,4)
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),GCLK(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 MCLK(U24-5,130MHz) and DCLK(U25-5,40MHz)
4.chk U17 whether S/W inside or bad soldering
5.change U22(bad soldering)
6.chk Reset IC (U14)
7.chk Abnormal 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]
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