Hitachi C20 Lc880snt Service Manual

							- 11 -TROUBLESHOOTING
YesNo
No Check LED
Replace LED
with a new one Is the power cord and
DC adapter plugged in?
LED lights up
Press Power button Yes
LED light is green
LED light is red
Check inverter PWB unit Check MCU(U4)
1.Check MCU (U4)
2.Check CN3 (or
CN7) is connected
3.Check U8 has VCC voltage 1.Connect the line
of J9and inverter
2.Replace inverter with a newone Replace MCU with
a new one Replace DRIVE
PWB unit with
a new one
1.Replace MCU
with a newone.
2.Replace U8 with a newone. Defective
Normal
Defective
Defective Normal Check power input system
1.AC adapter
*Normal?
*Connected properly?
2.U9 has +5V?
3.U10 has 3.3V?
4.LED controls electrocircuit?
5.JD3 and JD2 are connected? Normal
TV DOES NOT TURN ON Plug in
Defective 
						

							- 12 -SCHEMATIC DIAGRAMS
Main Diagram-1 
						

							- 13 -SCHEMATIC DIAGRAMS
Main Diagram-2 
						

							- 14 -SCHEMATIC DIAGRAMS
Control Keys Diagram 
						

							- 15 -SCHEMATIC DIAGRAMS
Power Diagram 
						

							- 16 -SCHEMATIC DIAGRAMS
Tuner Diagram 
						

							- 17 -SCHEMATIC DIAGRAMS
Teletext Diagram 
						

							- 18 -SCHEMATIC DIAGRAMS
Video Decoder Diagram 
						

							- 19 -SCHEMATIC DIAGRAMS
Audio And CONN Diagram 
						

							- 20 -SCHEMATIC DIAGRAMS
Lvds_ttl-out Diagram