Troubleshooting
4. Troubleshooting
4-1 Checkpoints by Error Mode
4-1-1 No Power
No Power
No Check MAIN PCB No
Check MAIN PCB UIC1 Check or replace SMPS.
PCN3 Pin 1 ~ 4 : 5V,
UD1, 2, 3 : 5V?
Pin 6, 9 : 12V?
Yes Yes
1
No Check MAIN PCB No
Check MAIN PCB UIC1 Check or replace SMPS.
Pin 14, 40, 55, 89: 5V? CON3 Pin 1: 5.6V?
Refer to wave pattern
Yes image of Fig. 4-1.
Check VFD Voltage No
in MAIN PCB PCN3 Check or replace SMPS.
Pin 13 ~ 15?
Yes
Check reset No Check signal and signal
circuit in MAIN PCB UX1, UX2
pattern.
part ok?
Yes
Check pattern or replace
MICOM IC.
Samsung Electronics 4-1
PCN3
Troubleshooting
1
1
TACN1
W
MAIN_MICOM, page 7-3
1
1
PIC3
UIC1 1
M
MAIN PCB Top, page 6-5
<Fig. 4-1>
4-2 Samsung Electronics
1
Troubleshooting
4-1-2 No Output
No Output
Check MAIN PCB
Check MAIN PCB No Yes
PCN1 Pin 1 ~ 4: +37V or 29V Check the AIC 2 working.
ALD10, 11 red led is light? and Pin 11 ~ 14: -37V
or -29V?
Yes No
Check or replace SMPS.
Check MAIN No Check IC13 (4560) signal
PCB IC13 (4560) input and
input and signal pattern.
output signal?
Yes
1
Check MAIN PCB No Check WIC1(9830) signal
WIC1 (9830) and input and input and signal pattern.
output signal?
Refer to wave pattern
image of Fig. 4-2.
Yes
Check MICOM IC No Check signal input and
(UIC1) and MICI MPEG signal pattern or replace
(ESS) signal? SMPS.
Yes
Replace UIC1 and MIC1.
Samsung Electronics 4-3
Troubleshooting
3 PCN1
1
IC13
AIC1
MAIN _AMP, page 7-6
WIC1
MAIN PCB Top, page 6-5
PIC3
<Fig. 4-2>
4-4 Samsung Electronics
Troubleshooting
4-2 Measures to be taken when the Protection Circuit operates
4-2-1 SMPS Check Flow-SMPS Protection
Cases of the SMPS Protection.
1. If there is over current at the AMP IC (Speaker Wire Short)
2. If temperature of the AMP IC is over 150°C.
3. There is no power supply for AMP.
Protection
Location Pin No. Remark
Open Short
+12V (6, 9#) X X
CON3
D5.6V (1~4#) X X
+PVDD (about +38V) C630 about
SMPS PCB X
(1~4#) +27.5V
-PVDD (about -38V) C630 about
CON2 X
(11~14#) -27.5V
+5V (7#) X X
-5V (8#) X X
<Table 4-1>
Samsung Electronics 4-5
Troubleshooting
4-2-2 AMP Pre-Inspection relating to Power Protection
If you think, there are problems at the AMP PART, you can check the PCB without disassemble the set.
(Caution!!: Do not connect the power cord during bellow check!)
Measurement Resistance using Tester
- Approximately -
F/R CH 2kΩ
SUBWOOFER 2kΩ
<Table 4-2>
If Measured Resistance is very different from above numbers. There is a Problem. → AMP PART Problem
2CH SPEAKER OUT
RIGHT
GND
LEFT
4-6 Samsung Electronics
Troubleshooting
4-3 MICOM, MPEG Initialization & Update
Micom Reset
During STANDBY mode, push the “STOP” button 5 Second. If VFD blinking, reset is finished.
Micom Update (Only for Flash Micom)
Method 1) MAIN PCB UTCN1 for update JIG.
To update Micom, it need Computer, Rom Writer, USB Cables.
Method 2) Insert USB Memory, and play.
“Update” will be displayed. Set will be power off when finish.
Micom & MPEG Version Check
1. Power On.
2. In VSB Function. “NO USB” status.
3. Push the number NEXT for 5 seconds, check the Micom version.
4. Push the number PREVIOUS for 5 seconds, check the MPEG version.
MPEG Update Method
1. Prepare Rom file at USB Memory.
2. Insert USB Memory, and play. “Update” will be displayed and glisten. Set will be power off → on.
3. The disc is automatically ejected. (If you use USB memory, detach USB memory.)
MPEG Reset
1. During “No Disc” displayed, push the stop button 5 seconds. After displayed “INITIALIZE” set will power off
automatically.
Samsung Electronics 4-7
Troubleshooting
4-4 Buyer-Region Code Setting Method
4-4-1 The inserting method of Region Code after replacing the Main PBA
[Reference]
- When replacing the Main PBA and System Micom should be inserted the region code.
- The set is not working properly if you don't insert the region code.
- The region code is inserted by the remote control.
1. Press the “AUX” button on the remote control.
2. Press the “ANGLE” button on the remote control during 4~5
seconds.
3. After step (2), you can see “TEST − −” on the VFD.
Insert number “33”, “33” to select Region Code.
TEST − −
4. After step (3), you can see “− −” on the VFD.
Insert the Region Code corresponding model with
“0 ~ 9” buttons on the remote control. −−
5. Turn the Power off.
4-8 Samsung Electronics
Troubleshooting
Option Table
MX-C730 / MX-C630 MX-C730D / MX-C630D
Buyer Remark
Region Code Region Code
Africa, Pakistan 00 30
Australia 01 31
BRAZIL 02 32
CANADA 03 33
China (semi_mic) 04 34
England 05 35
Europe 06 36
HACO 07 37
India 08 38
Indonesia, HONGKONG 09 39
Israel 10 40
Iran 11 41
JAPAN 12 42
KOR 13 43
Latin American 14 44
Mexico 15 45
Newzealand 16 46
Philippines 17 47
Russia (full_mic) 18 48
Russia (semi_mic) 19 49
South Africa 20 50
Taiwan 21 51
USA 22 52
Middle Asia 23 53
Asia 24 54
Singapore 25 55
<Table 4-3>
Samsung Electronics 4-9
Schematic Diagram
7. Schematic Diagram
7-1 Overall Block Diagram
The Main Micom IC is LC87F5NC8A. It’s same as last year. MPEG chip is ES8391SCD. It’s upgrade version of
ES8390SCD.
REC SIGNAL
TAPE ASS'Y SIGNAL
Y,Pb,Pr The Main Micom control every IC in this PCB.
12V (MOTOR)
5.6V(p_sense)
5. 6V(MICOM)
12V (TAPE)
P ON(5V)
VFD VP
+PVDD
+5V
PVDD
+VFD
SIGNAL
5V
AUDIO
VFD
Ctrl
PWM_DATA
PWM_CLK Video signal is come from DVD mecha and go to the MPEG IC. Then MPEG IC decode this signal to real video signal.
PS_SI
VFD PT6324 VFD_CB PS_CS
DISPLAY VFD VFD_CLK LC87F5NC8A OPEN AMP POWER MAIN POWER
DRIVER VFD_DATA
MICOM RL+ CLOSE Audio signal is come from DVD mecha, TUNER, AUX, MIC. Then MPEG IC decode to digital I2S signal.
RL-
SMPS This signal goto the PS9830(PWM modulator) to convert PWM signal. PWM signal amplified at IR AMP stage and then
8082 8082
M_STB DTF DTF
Low Pass Filtered. This signal is real audio signal.
Ctrl
M_ACK
TM - (CL)
TM+(OP)
SIGNAL
CM- (DW)
CM+ (UP)
M_RXD
USB CtrL+SIGNAL M-RESET PRE-AMP
4560
JACK MICOM- UPDATE
MPEG UPDATA
PWM_FL_L+
PWM_FL_L- POWER SPK FL
AUX SIGNAL IRF4019 L SPK
JACK TBCK FL X2
PS 9830
ESS_P3 TWS PRE-AMP
4560
AMP
IRS2053
TSD0
TUNER SIGNAL PWM FR
JACK
MPEG TSD1
TSD2 POWER SPK_FR
IRF4019 R SPK
CtrL+SIGNAL PWM_FR_R+
74LCX04 PWM_FR_R-
X2
Ctrl 12.288 MHz
MIC SIGNAL
PRE-AMP
JACK 4560
DATA Ctrl
5 Tray
H/P Motor Ctrl
DRAM IC AM 5766 MECHA
JACK
H/P SIGNAL
Samsung Electronics This Document can not be used without Samsung’s authorization. 7-1
Schematic Diagram
7-2 FRONT
POWER
AUDIO
7-2 This Document can not be used without Samsung’s authorization. Samsung Electronics
Schematic Diagram
7-3 MAIN_MICOM
POWER
AUDIO
TP1
TP1
Samsung Electronics This Document can not be used without Samsung’s authorization. 7-3
Schematic Diagram
7-4 MAIN_MPEG
POWER
AUDIO
VIDEO
7-4 This Document can not be used without Samsung’s authorization. Samsung Electronics
Schematic Diagram
7-5 MAIN_PWM
POWER
AUDIO
Samsung Electronics This Document can not be used without Samsung’s authorization. 7-5
Schematic Diagram
7-6 MAIN_AMP
TP2
POWER
AUDIO
TP2
7-6 This Document can not be used without Samsung’s authorization. Samsung Electronics
Schematic Diagram
7-7 SMPS
EER4042V L2
EER4215V 2.9uH (0.8)
L3
4,5 6 2.9uH (0.8)
8 7
2 3
EER-2525V
L1
2.9uH
8 7 6 5
D
S G
1 2 3 4
Samsung Electronics This Document can not be used without Samsung’s authorization. 7-7
MEMO
7-8 Samsung Electronics
