Daewoo HC-4130X - Front Circuit Troubleshooting

12
6. Trouble Shooting Guide
START
1. INITIAL OPERATING
Is Standby
LED on?
No
Initial Operation OK.
Check if IC501
pin 207 is high?
Yes
Check OSC
waveform of
XC501.
Yes
Check I2C Line
of IC504.
Yes
Yes
Check interface
of VFD Dr
iver
Yes
Is Power on?
Check Connection CN701.
Check Power Supply.
No
No
No
No
No
Yes
Replace Reset IC.
IC508.
Check DVD Power Supply
Section, PT902.
Replace Crystal, XC501.
Check Devices connected I2C
Line.
IC201, IC401, IC408.
Check VFD Data Interface.
VFD_DATA/CLK.
Replace Front PCB As
s’y.
Check interface
of SDRAM
No
Check CLK of SDRAM.
Replace Flash Memory.
Is Power on?
1
No
Yes
2
Yes
Front Circuit