Troubleshooting; Green - Hitachi C15-LC880SNT Service Manual

TROUBLESHOOTING

Normal
1. Check MCU (U4)
2. Check CN3 (or
CN7) is connected
3. Check U8 has
VCC voltage
Defective
1. Replace MCU
with a new one.
2. Replace U8
with a new one.
TV DOES NOT TURN ON
Is the power cord and
DC adapter plugged in?
LED lights up
Press Power button
LED light is green
Check inverter PWB unit
Defective
1. Connect the line
of J9 and inverter
2. Replace inverter
with a new one
No
Yes
No
Yes Defective
LED light is red
Check MCU(U4)
Defective
Replace MCU with
a new one
Check power input system
1. AC adapter
2. U9 has +5V?
3. U10 has 3.3V?
4. LED controls electrocircuit?
5. JD3 and JD2 are connected?
- 11 -
Plug in
Normal
Check LED
Replace LED
with a new one
Normal
Replace DRIVE
PWB unit with
a new one
* Normal?
* Connected properly?