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Troubleshooting: Samsung Electronics 4-1

This document provides troubleshooting information for errors: 1. It outlines different error modes including no power, no output, CD not playing or no sound, and protection errors. 2. For each error mode, it lists checkpoints to diagnose the issue, such as checking voltages on specific parts of the MAIN or SMPS PCBs. 3. It also describes what happens when the protection circuit operates, including which circuits will open or short, and recommends replacing parts if issues persist. 4. Finally, it covers initializing or updating the MICOM processor, including how to check the current version. Resetting involves holding the stop button for 5 seconds during standby mode.

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Olger Quintero Tapia
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70 views8 pages

Troubleshooting: Samsung Electronics 4-1

This document provides troubleshooting information for errors: 1. It outlines different error modes including no power, no output, CD not playing or no sound, and protection errors. 2. For each error mode, it lists checkpoints to diagnose the issue, such as checking voltages on specific parts of the MAIN or SMPS PCBs. 3. It also describes what happens when the protection circuit operates, including which circuits will open or short, and recommends replacing parts if issues persist. 4. Finally, it covers initializing or updating the MICOM processor, including how to check the current version. Resetting involves holding the stop button for 5 seconds during standby mode.

Uploaded by

Olger Quintero Tapia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 8

Troubleshooting

4. Troubleshooting

4-1 Checkpoints by Error Mode.................................................................4-2

4-2 Measures to be taken when the Protection Circuit operates............4-6

4-3 MICOM Initialization & Update.............................................................4-7

Samsung Electronics 4-1


Troubleshooting

4-1 Checkpoints by Error Mode

4-1-1 No Power

No Power

Check MAIN PCB No


CON2 (P5) U-COM Check SMPS PCB F1 (FUSE)
SUPPLY (DC 5.6V)

Yes

Check MAIN PCB No


CON2 (P7) POWER- SENS
Voltage (DC 4.5-5V)

Yes

Check FRONT PCB No


VFD P1-P21 (AC2.4-3.1V),
IC1 P30: -32V

Yes

Check pattern and Connector Wire

4-2 Samsung Electronics


Troubleshooting

4-1-2 No Output

No Output

MAIN PCB Check Signal No Check Mute on DIC4 P27


at DIC4 (PS9829B) P15, P17 (H: Mute, L: Normal)

Yes

MAIN PCB Check Signal No


Check Patten
at AIC3 P10, P15

Yes

Check AIC3 P21 (DC5V), No


Replace AIC3
P18 (DC3.3V)

Yes

Replace SMPS

Samsung Electronics 4-3


Troubleshooting

4-1-3 CD No Play or No Sound

CD No Play or No Sound

No Play Yes
PLAYING OK MAIN PCB IC2 P8 (5V) MAIN PCB IC1 P36 (3.3V)

No Sound No

Replace SMPS

Check CD-Mute High


on UIC1 P69
(H: Mute, L: Normal)

Low

No Output Check Reset SET or Check UIC1

4-4 Samsung Electronics


Troubleshooting

4-1-4 Protection

Protection

MAIN PCB UIC1 P99 High


Reset SET or Check UIC1
(L: Protection, H: Normal)

Low

No
MAIN PCB CON2 P10 (3.3V)

Yes

MAIN PCB CN106 No


Replace SMPS
P9 (12V), P1 (34.5V)

Yes

MAIN PCB Check Yes


Replace the P5 (LOW) IC
RIC/LIC/WIC (A66) P5 (12V)

No

Reset SET

Samsung Electronics 4-5


Troubleshooting

4-2 Measures to be taken when the Protection Circuit operates

4-2-1 Operation of Power Block Protection Circuit


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 input at GATE DRIVER.

Part Protection Circuit Operation


Pin No. Remark
Location Open Short
+12V (1) X X

+5.6V (5) X X
CN3
SMPS PCB +3.3V (10, 11) X X

+5V (12, 13) X 


PVDD (about 34V) (1~3) X 
CN2 -12V (7) X X

+12V (9)  

<Table 4-1>

4-6 Samsung Electronics


Troubleshooting

4-3 MICOM Initialization & Update

 MICOM Reset
During STANDBY mode, push the ‘STOP’ button 5 Second. If power LED blinking, reset is finished.

 MICOM update (Only for Flash Micom)


Back of the Set there is a slide hole for update JIG.
To update Micom, it needs Computer, Rom Writer and USB Cables.

 MICOM Version Check


1. Power off state.
2. Long press next key 5 seconds.
3. Check the display or OSD.

Samsung Electronics 4-7


MEMO

4-8 Samsung Electronics

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