Daewoo Hc 4250 Service Manual

5. Firmware Upgrade
Preparing the Firmware Upgrade
Activating the Firmware Upgrade
1. Write a disc to Update file by PC Writing Program.
2. A size of dummy folder is more than 10M bite.  (ex : font_dw, attached picture)
3. Put Firmware file in a disc.
1. Open the Door of DVD Receiver.
2.  Insert the Update Disc into the Disc Tray.
3. Close the Door, then DVD Receiver reads the disc, 
and  Update the Firmware itself.
 HC-XX50( )/60( ) / 80( )
- Basic : A50_8.ROM
- DivX : A50A_16.ROM
 HC-4130( ) / 4230(...

5. Firmware Upgrade
Read the Disc, Checksum Check and Update New Firmware.
Completed Update.
1. Automatically Power off(about 15 sec), than enter standby mode.
2. Press Power Button, the System is working.
3. Open the Door of DVD Receiver then remove the Firmware update disc.
READING OKFLASH
DONE
10
CHECKSUM OKERASE/WRITE
Check the Update Version.
1. Open the Door of DVD Receiver.
2. Press Audio Button or Subtitle Button.
 Audio Button : Check for MPEG Firmware Version.
 Subtitle Button : Check for...

6. Trouble Shooting Guide
11
START
1. BASIC OPERAT ING
Is Standby LED 
on?
Check Power Supply Circuit.
Check Connection CN701.
No
Turn Power on.
Is Power on?
Ye s
Check DVD Processor Circuit.
IC501 Block.
No
Does Initial 
read work?
Ye s
Check DVD Mechanism.
Check RF Circuit IC301.
No
Does It Play?
Ye s
No
Check DVD Region.
Check RF Circuit IC301.
Ye s
Does It Ou
tput 
Audio?
No
Check Audio  Section.
Ye s
OK
Audio Part
 

12
6. Trouble Shooting Guide
START
1. INITIAL OPERATING
Is Standby
LED on? 
No
Initial Operation OK.Check if IC501 
pin 207 is high? Ye s
Check OSC 
waveform of 
XC501.
Ye s
Check I2C Line 
of IC504.
Ye s
Ye s
Check interface 
of VFD Dr
iver 
Ye sIs Power on?
Check Connection CN701.
Check Power Supply.
No
No
No
No
No
Ye s
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....

13
6. Trouble Shooting Guide
Check if 
pwr_on of 
IC208 is high?No
Ye s
Check I2C Line 
of IC504.
Ye s
Check interface 
of VFD Driver 
Ye s
No
No Check Devices connected I2C 
Line.
IC201, IC401, IC408.
Check VFD Data Interface.
VFD_DATA/CLK.
Replace Front PCB Ass’y.
Check interface 
of SDRAM
No
Check CLK of SDRAM.
Replace Flash Memory.
1
Check if display 
of Logo on TV?No
Check Connection between 
Main and Mechanism.
Replace DVD Mechanism. Ye s
Ye s
2
Check if protect 
of IC207 is 
high?
Ye s
Check...

14
6. Trouble Shooting Guide
3. AUDIO Abnor mal
Check if the I2S 
output of IC501 
is ok?
Replace IC501.
No
Check if the I2S 
input of IC201 
is ok? Ye s
Check Schmitt Triger IC.
IC204, IC205.
Check if the 
PWM output of 
IC201 is ok?
Ye s
No
Check if the 
PWM output of 
Digital Amp  is 
ok?
Ye s
Ye s
Check if 
Speaker Output 
is ok?
Ye s
OK
Audio Abnormal  of 
DVD Function
Check if 
suppled powe
r 
is ok?
Check Regulator Circuit.
IC202.Ye s
Check if EAPD 
is high?
No
No
Check PLL Circuit of IC201.
Ye s...

15
6. Trouble Shooting Guide
3. AUDIO Abnor mal
Check if the I2S 
output of IC401 
is ok?
No
Ye s
Check if the 
TDM input of 
IC501 is ok?
Audio Abnormal  of 
Video Input Function
Check if I2C 
between IC501 
is ok?
No
Check I2C Line.
Ye s
Check if I2S 
between IC406 
is ok?
No
Check I2S output of IC406.
Check Crystal XC401. Ye s
No
Check IC406 DAUX output.
Check I2S Format of TDM Port.
IC501 pin 101 to 103.
1
Ye s
Audio Part
 

16
6. Trouble Shooting Guide
3. AUDIO Abnor mal
Check if the I2S 
output of IC401 
is ok?No
Ye s
Check if the 
TDM input of 
IC501 is ok?
Audio Abnormal  of 
Tuner Function
Check if I2C 
between IC501 
is ok?
No
Check I2
C Line.
Ye s
Check if I2S 
between IC40
6 
is ok?
No
Check I2S outp
ut of IC406.
Check Crystal XC401. Ye s
No
Check IC406 DAUX output.
Check I2S Format of TDM Port.
IC501 pin 101 to 103.
2
Ye s Check if the 
Data Interface 
is ok?
Check IC207 Data Interface 
Stereo, Tuned, PLL_CE.
No...

17
6. Trouble Shooting Guide
3. AUDIO Abnor mal
Check if the I2S 
output of IC407 
is ok?No
Ye s
Check if the 
TDM input of 
IC501 is ok?
Audio Abnormal of Digital 
Audio Input Function
Ye s
No
Check IC406 CDTO output.
Check I2S Format of TDM Port.
IC501 pin
 101 to 103.
3
Ye sCheck if the 
Input Select is 
ok?
Check IC207 Data Interface 
DATA, CLK, 41 17_CS
No
Check if the 
Data interface 
is ok?
No
Ye s
Check Crystal XC401.
No
Ye s
Check if the 
OSC waveform 
is ok? OPTICAL INPUT & COAXIAL INPUT
Audio...

18
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 
IC410 is ok?
Ye s
Ye s
Check if 
H/P 
Output of Jack 
is ok?
Ye s
OK
Audio Abnormal  of 
H/P 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 TR of Mute Cir cuit.
Check Mutec Port of IC408.
No...