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Daewoo Hc 4250 Service Manual

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Page 21

6. Trouble Shooting Guide
4. AUDIO LINE OUTPUT Abno rmal
Check if the 
output of IC501 
pin121 is ok?
Replace IC501.
No
Ye s
Check if the 
output of IC408 
is ok?No
Check if the Signal waveform of IC401  is ok?
Ye s
Ye s
Check if
 REC 
Output of Jack 
is ok?
Ye s
OK
Audio Abnormal  of 
Rec Output
Check if I2S 
between IC501 
is ok?
Check I2S Line.Ye s
Check if VQ & 
FILT+ is ok ?
No
No
Check PLL 
Circuit of IC408.
Replace DAC, IC408
Ye s
No
Check IC409 Buffer.
No
Check Function IC, IC401
19
Audio Part
 

Page 22

6. Trouble Shooting Guide
4. AUDIO LINE OUTPUT Abno rmal
Check if the 
output of IC501 
pin120 is ok?
Replace IC501.
No
Ye s
Check if the 
output of IC408 
is ok?No
Ye s
Ye s
Check i
f SW 
Output of Jack 
is ok?
Ye s
OK
Audio Abnormal  of 
Subwoofer Output
Check if I2S 
between IC501 
is ok?
Check I2S Line.Ye s
Check if VQ & 
FILT+ is ok ?
No
No
Check PLL 
Circuit of IC408.
Replace DAC, IC408
Ye s
No
Check IC411 Pre Amp Circuit.
20
Audio Part
 

Page 23

6. Trouble Shooting Guide
4. AUDIO LINE OUTPUT Abno rmal
Check if the 
output of IC501 
pin124 is ok?
Replace IC501.
No
Ye s
Check if the 
output of IC404 
is ok?No
Ye s
OK
Audio Abnormal  of 
Optical Output
Check if Setup 
is ok?
Setting for Digital Output onYe s
Check if IC303 
is ok?
No
No
Replace Buffer, IC303
Ye s
21
Audio Part
 

Page 24

6. Trouble Shooting Guide
5. AUDIO  CONTROL  Abnormal
Check if the 
I2C waveform 
of IC201 is ok?
Check between IC501 to IC201.
Replace IC201.
No Ye sCheck if the 
data of IC501 is 
ok?No
Ye s
OK
Audio Abnormal  of 
Volume Control
Check Input 
data of volume 
is ok?
Check Connection CN701.
Check Encoder SW. VR701.Ye s
No
Replace IC501
22
Audio Part
 

Page 25

6. Trouble Shooting Guide
5. AUDIO  CONTROL  Abnormal
Ye sCheck if the 
data of IC501 is 
ok?No
OK
Audio Abnormal  of 
Remote Control
Check Input 
data of RMC is 
ok?
Check Connection CN701.
Check Remote Receiver, RM701.Ye s
No
Replace IC501
23
Audio Part
 

Page 26

6. Trouble Shooting Guide
6. VIDEO OUTPUT Abno rmal
Ye sCheck if the 
Output of IC501 
is ok?
OK
VIDEO Abnormal  of 
Component
Check Setup is 
ok?
Setting for RGB Mode.
Ye s
No
Replace IC501
Check the 
output of IC601 
is ok?NoNo
Check Filter Circuit.
Check Drive IC, IC601.
Check the
 
output of Jack 
is ok?
Ye s
Ye sNo
Check Filte
r Circuit. Check Crystal 
is ok?
Ye sReplace Cystal, XC501.
No
24
Audio Part
 

Page 27

6. Trouble Shooting Guide
6. VIDEO OUTPUT Abno rmal
Ye sCheck if the 
Output of IC501 
is ok?
OK
VIDEO Abnormal
 of S-VIDEO
Check Setup is 
ok?
Setting for S-VIDEO Mode.
Ye s
No
Replace IC501
Check the 
output of IC601 
is ok?NoNo
Check Filter Circuit.
Check Drive IC, IC601.
Check the
 
output of Jack 
is ok?
Ye s
Ye sNo
Check Filte
r Circuit. Check Crystal 
is ok?
Replace Crystal, XC501.
No
25
Audio Part
 

Page 28

6. Trouble Shooting Guide
6. VIDEO OUTPUT Abno rmal
Ye sCheck if the 
Output of IC501 
is ok?
OK
VIDEO Abnormal  of 
Composite
Ye s
Replace IC501
Check the 
output of IC602 
is ok?NoNo
Check the 
output of Jack 
is ok?
Ye s
Ye sNo
Check Filter Circuit.Check Crystal 
is ok?
Replace Crystal, XC501.
No
Check the 
control of 
Select is ok?
Check Power Supply Circuit.
Check Control Line between 
IC208 : Sel1, Sel
2
No
Replace IC602 Ye s
26
Audio Part
 

Page 29

6. Trouble Shooting Guide
7. MECHA CONTROL Ab normal
Ye sCheck if the 
data input of 
IC501 is ok?
OK
Control Abnormal  of 
Open/Close
Ye s
Replace IC501
Check the
 
output of IC303 
pin 1,7 is ok?NoNo
Ye sCheck VFD 
data is ok?
Replace Front PCB Ass’y.
Check Connection CN701.
Check data waveforn of 
VFD_DATA, CLK, CS
No
Check the 
Supplied power 
is ok?
Check Powe
r Supply Circuit.
No
Replace IC303 Ye s
27
Audio Part
 

Page 30

6. Trouble Shooting Guide
7. MECHA CONTROL Ab normal
Ye sCheck if the 
data input of 
IC501 is ok?
OK
Control Abnormal  of 
Disc Loading
Ye s
Replace IC501
Check the 
output of IC302 
is ok?NoNo
Ye sCheck VFD 
data is ok?
Replace Front PCB Ass’y.
Check Connection CN701.
Check data waveforn of 
VFD_DATA, CLK, CS
No
Check the 
Supplied power 
is ok?
Check Powe
r Supply Circuit.
No
Replace IC302 Ye s
Check the 
interface da
ta is 
ok?
Check data between IC501.
No
Ye s
28
Audio Part
 
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