Samsung HT C553 – Region code setting, Initialization, SMPS and power amplifier circuit diagram - 5.1CH Digital Home Theater System

Buyer-Region Code Setting Method
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 will not work 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 "TUNER MEMORY" button on the remote control upto 4~5 seconds.
3. After step (2), you can see “TEST” on the VFD.
4. When you see “TEST” on VFD, Insert number “4”, “6” to start Region Code setting mode.
5. After step (4), you can see “- -” on the VFD.
Insert the Region Code, of corresponding model with “0 ~ 9” buttons on the remote control.
6. After step (5), you can see “15 USA” on the VFD.
It means that currently System Micom program is installed by USA specification
7. Turn the Power off.

In case of System Micom and EEPROM problem, you can apply to this.
For example, during Updating program of System Micom, if Updating fail is happened, it is impossible to turn on the system from stand-by status.
The system will keep the stand-by status continuously, and the touch-key function will never work.
In this case, you have to change System Micom, and set up the Buyer Region code again.
In case of EEPROM, you don't need to care about it.
After set-up the Region code, System Micom will store the information of the region code to EEPROM automatically.

SMPS schematic [circuit diagram]

Power amplifier circuit diagram [schematic]

Click on the schematics to zoom in

DVD flash Initialization & Update

1. Prepare a DISC-CD or DVD or USB that contains ‘C550WWB.ROM’ file for Update.

2. Play the DISC or USB, then ‘Updating’ will appear on the screen, then Power will go out and on.

3. Then DISC-TRAY will open, then remove the DISC or USB, making the Unit as ‘NO DISC’ state.

4. Press ‘STOP’ button of Main Unit for more than 5 seconds, Display Indicator shows ‘INITIALIZE’ then Power goes out.

Checking out MICOM & MPEG flash Version

1. On Root state, Select ‘Set up’.

2. Press “Enter” and move Support.

3. Press “Enter”.

4. Check product information: “SW ver” on TV Display and “Micom SW Ver” on Front ASS’y VFD.

MICOM, MPEG Initialization & Update

Micom initial
In no Disc condition, press ‘STOP’ button of Main Unit more than 5 seconds, VF Display will happen to INIT and M int. Then Initialization complete.
 Micom Update
1. Prepare or Make a DISC-CD or DVD or USB that contains “C550WWM.SSP’ file for update.
2. Play the USB, then “updating” will appear on the screen, then Power will go out after showing ‘complete’ on the screen.
3. Press “Power” key and Press ‘Stop’ button of the remote control more than 5 seconds in No Disc.

SMPS Protection
The Condition of Power Protection Active.
1. Voltage of SMPS’s +, - PVDD (+30V, -30V) is higher or lower than Standards Normal Condition Voltage Range: PVDD (+30V, -30V): about +30V, -30V
2. Over-current occurs to FET (Over-output or Output short)
3. FET’s temperature exceed 150°C.
4. No supply voltage on GATE DRIVER

AMP Pre-Inspection relating to Power Protection
If you think, there are problems at the AMP PCB, you can check the pcb without disassemble the set.