Samsung PL42B450B1D Diagram

Disassembly & Reassembly

3. Disassembly & Reassembly

3-1 Overall Disassembly & Reassembly

Notice

- Be sure to separate the power cord before disassembling the unit.

- Discharge the capacitors first when separating PCB's with high capacity capacitors such as SMPS, X Main Board, Y Main Board, etc. (Aspark may be generated by the electric charge, and there is danger of electronic shock.)

- Check that the cables are properly connected referring to the circuit diagram when disassembling or assembling the unit taking care not to damage the cables.

- Take care not to scratch the Glass Filter in the front.

- Assemble the boards in the reverse order of the disassembly.

- The plasma must be layed down on a flat padded surface for disassembly and reassembly.

<42">

※ Screw Torque

- M3 : 7~9 Kgf/Cm

- M4 : 12 Kgf/Cm

<50">

3-1-1 Separation of ASSY COVER P-REAR 42"/50"

Part Name Description Description Photo

Cover

Rear

① Remove 17 screws. ( )

: BH,+,B,M4,L3,ZPC(BLK)

② Remove 6 screws. ( )

: PH,+,WSP,S,M4,L35,ZPC(BLK)

③ Remove the rear cover.

: Please lay the PDP unit face down on a

soft surface when removing the stand.

Samsung Electronics 3-1

Disassembly & Reassembly

3-1-2 Separation of ASSY PCB MISC-MAIN

Part Name Description Description Photo

Main

Board

① Detach all connectors from the Main

Board.

② Remove 4 screws.

: BH,+,B,M3,L6,ZPC(BLK),SWRCH18A,-

③ Remove the Main Board.

<42">

<50">

3-1-3 Separation of FILTER-EMI AC LINE 42"/ 50"

Part Name Description Description Photo

FILTER-

EMI

AC LINE

① Detach connector from SMPS.

② Remove 2 screw. ( )

: PH,+,WWP,M3,L8,NI PLT

③ Remove 1 screws.( )

: BH,+,S,M4,L10,ZPC(BLK)

④ Separate FILTER-EMI AC LINE from

bracket.

3-2 Samsung Electronics

Disassembly & Reassembly

Samsung Electronics 3-3

3-1-4 Separation of BRACKET-PCB 42"/50"

Part Name Description Description Photo

Bracket

PCB

Remove screw.( ) : BH,+,B,M4,L3,ZPC(BLK)

Remove the BRACKET-PCB.

3-1-5 Separation of ASSY BRACKET 42"/50"

Part Name Description Description Photo

Bracket

Remove 2 screws. ( ) : BH,+,PT,S Tite,M4,L10,ZPC(BLK)

Remove 2 screws. ( ) : BH,+,B,M4,L3,ZPC(BLK)

Remove Bracket.

3-1-7 Separation of ASSY SPEAKER P 42"/50"

Part Name Description Description Photo

Speaker

Remove 4 screws.( ) : BH,+,WP,B,M4.0,L3,ZPC(BLK),

SWRCH18A

Remove the Speaker.

Disassembly & Reassembly

3-4 Samsung Electronics

3-1-6 Separation of ASSY BRACKET P-WALL

Part Name Description Description Photo

42"

Wall

Bracket

Remove 2 screws. ( ) : BH,+,B,M4,L3,ZPC(BLK)

Remove 3 screws. ( ) : BH,+,S,M4,L10,ZPC(BLK)

Remove Wall Bracket.

: Please lay the PDP panel face down

on a soft surface when separating front cover.

50"

Wall

Bracket

Remove 2 screws. ( ) : BH,+,B,M4,L3,ZPC(BLK)

Remove 4 screws. ( ) : BH,+,S,M4,L10,ZPC(BLK)

Remove Wall Bracket.

Disassembly & Reassembly

Samsung Electronics 3-5

3-1-8 Separation of SMPS-PDP TV

Part Name Description Description Photo

42"

SMPS

Detach all connectors from the SMPS.

Remove 6 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the SMPS.

: Wear gloves when handling the power

board as there may be some remaining electrical charge in the capacitor. Specifically, avoid touching any part of the capacitor.

50"

SMPS

Detach all connectors from the SMPS.

Remove 6 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the SMPS.

3-1-9 Separation of ASSY PDP MODULE P-LOGIC MAIN BOARD 42"/ 50"

Part Name Description Description Photo

Logic

Board

Detach all connectors from the Logic Main Board.

Remove 2 screws. : WSP,PH,+,M3,L8,NI PLT

Remove the Logic Main Board.

Disassembly & Reassembly

3-6 Samsung Electronics

3-1-10 Separation of ASSY PDP MODULE P-X MAIN BOARD

Part Name Description Description Photo

42"/50"

Flat able

Detach all Connectors from the X Main Board.

To separate the Flat Cable of the X-Board, press the upper and the lower sides of the connector.

: Pinch the sides, but then push down in the ribbon, it

should slide out after that.

42"

X-Main

Board

Remove 4 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the X-Main Board. (Separate the 4 connectors, 2 cables)

50"

X-Main

Board

Remove 7 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the X-Main Board. (Separate the 5 connectors, 4 cables)

Disassembly & Reassembly

Samsung Electronics 3-7

3-1-11 Separation of ASSY PDP MODULE P-Y MAIN BOARD

Part Name Description Description Photo

42"

Detach the scan board connectors from the panel . Remove connectors from SMPS and logic board. Remove 9 screws.

50"

Detach the scan board connectors from the panel . Remove connectors from smps and logic board Remove 7 screws .

3-1-13 Separation of ASSY PANEL BRACKETS

Part Name Description Description Photo

Panel

Brackets

Remove 7 screws. ( ) : BH,+,B,M4,L3,ZPC(BLK)

Remove the Side Panel Brackets.

3-1-12 Separation of ASSY PDP MODULE P-ADDRESS BUFFER BOARD

Part Name Description Description Photo

42" Buffer board shield

Remove 3 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the buffer board shield.

50" Buffer board shield

Remove 3 screws. : PH,+,WWP,M3,L8,NI PLT

Remove the buffer board shield.

Disassembly & Reassembly

3-8 Samsung Electronics

Troubleshooting

4. Troubleshooting

4-1 Troubleshooting

4-1-1 First Checklist for Troubleshooting

1. Check the various cable connections first.

- Check to see if there is a burnt or damaged cable.

- Check to see if there is a disconnected or loose cable connection.

- Check to see if the cables are connected according to the connection diagram.

2. Check the power input to the Main Board.

3. Check the voltage in and out between the SMPS ↔ Main Board, between the SMPS ↔ X, Y Main Board, and between the Logic Boards.

Samsung Electronics 4-1

Troubleshooting

■

4-1-2 Checkpoints by Error Mode

■

No Power (42")

- The LEDs on the front panel do not work when connecting the power cord.

Symptom

Major Checklist

- The SMPS relay does not work when connecting the power cord.

- The units appears to be dead. The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables

are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

- Check the internal cable connection status inside the unit.

- Check the fuses of each part.

- Check the output voltage of SMPS.

- Replace the Main Board.

Troubleshooting

Procedures

①

②

Is the AC IN socket connector and

the SMPS CN800S connected?

Yes

Is the Fuse (F801S) of the SMPS

Power Input Part blown?

SMPS CN801

Pin 3 : STB 5V

Pin 2 PS-ON : Check to see if it is 0V

Yes

Replace the Main Board

Yes

Insert the AC in connector and the

SMPS CN800S connector

Replace Fuse (F801S)

Replace the SMPS

4-2 Samsung Electronics

■

No Power (50")

Symptom

Major Checklist

Troubleshooting

- The LEDs on the front panel do not work when connecting the power cord.

- The SMPS relay does not work when connecting the power cord.

- The units appears to be dead. The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables

are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

- Check the internal cable connection status inside the unit.

- Check the fuses of each part.

- Check the output voltage of SMPS.

- Replace the Main Board.

Troubleshooting

Procedures

①

②

Is the AC IN socket connector and

the SMPS CN800S connected?

Yes

Is the Fuse (F801S) of the SMPS

Power Input Part blown?

SMPS CN801

Pin 3 : STB 5V

Pin 2 PS-ON : Check to see if it is 0V

Yes

Replace the Main Board

Yes

Insert the AC in connector and the

SMPS CN800S connector

Replace Fuse (F801S)

Replace the SMPS

Samsung Electronics 4-3

Troubleshooting

■

When the unit is repeatedly turned on and off (42")

Symptom - The SMPS relay is repeatedly turned on and off.

In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.

- Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if

Major Checklist

each voltage output is correct.

- If the symptom continues even when SMPS is operated alone, replace the SMPS.

- If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting the cables one by one.

Troubleshooting

Procedures

Caution

①

②

③

Does the symptom continue when

connecting the power after removing

CN810 from the SMPS?

Yes

Does the symptom continue when

connecting the power after removing

CN809 from the SMPS?

Yes

Does the symptom continue when

connecting the power after removing

CN807 from the SMPS?

Yes

Replace the SMPS

Replace the Y Main Board

Replace the X Main Board

Replace the Logic Board

When separating and connecting the cables such as CN810, CN809, CN808, CN807 of the Main SMPS, CN4701 of the X Main Board, and CN5707 of the Y Main Board, a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait some time after disconnecting the power cord from the unit.

4-4 Samsung Electronics

■

When the unit is repeatedly turned on and off (50")

Symptom - The SMPS relay is repeatedly turned on and off.

In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.

- Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if

Major Checklist

each voltage output is correct.

- If the symptom continues even when SMPS is operated alone, replace the SMPS.

- If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting the cables one by one.

Troubleshooting

Procedures

Caution

①

②

③

Does the symptom continue when

connecting the power after removing

CN804 from the SMPS?

Yes

Does the symptom continue when

connecting the power after removing

CN803 from the SMPS?

Yes

Does the symptom continue when

connecting the power after removing

CN802 from the SMPS?

Yes

Replace the SMPS

Replace the Y Main Board

Replace the X Main Board

Replace the Logic Board

Samsung Electronics 4-5

Troubleshooting

■

No Picture (When audio is normal)_42"

Symptom - Audio is normal but no picture is displayed on the screen.

- This may happen when the Main Board is functioning but the X, YMain Board, Logic Board, or Y Buffer

Major Checklist

Boards are not.

- The output voltage of the Main SMPS.

- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.

Troubleshooting

Procedures

Caution

Check the LED operation of Logic Board

Is it normally operating?

Yes

Check the output of LVDS

Is it normally operating?

Yes

Check the each output of the SMPS

Is it normally operating?

Yes

Check the each output of the SMPS after

disconnecting the power

cable from SMPS.

And replace X-main, Y-main Board,

Y-scan Board.

Replace the Logic Board

Replace the Main Board

Replace the SMPS

Replace the Y Scan Board

When separating and connecting the cables such as CN810, CN809, CN807 of the Main SMPS, CN4701 of the X Main Board, and CN5707 of the Y Main Board, a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait some time after disconnecting the power cord from the unit.

4-6 Samsung Electronics

■

No Picture (When audio is normal)_50"

Symptom - Audio is normal but no picture is displayed on the screen.

- This may happen when the Main Board is functioning but the X, YMain Board, Logic Board, or Y Buffer

Major Checklist

Boards are not.

- The output voltage of the Main SMPS.

- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.

Troubleshooting

Procedures

Caution

Check the LED operation of Logic Board

Is it normally operating?

Yes

Check the output of LVDS

Is it normally operating?

Yes

Check the each output of the SMPS

Is it normally operating?

Yes

Check the each output of the SMPS after

disconnecting the power

cable from SMPS.

And replace X-main, Y-main Board,

Y-scan Board.

Replace the Logic Board

Replace the Main Board

Replace the SMPS

Replace the Y Scan Board

Samsung Electronics 4-7

Troubleshooting

■

No Sound (42")

Symptom - Video is normal but there is no sound.

- When the speaker connectors are disconnected or damaged.

Major Checklist

- When the sound processing part of the Main Board is not functioning.

- Speaker defect.

Troubleshooting

Procedures

Is the cable connection between the

①

②

③

Main Board and the speaker

properly connected?

Is the output voltage of SMPS normal?

(CN801 #13)

Is the speaker output terminal

of the Main Board normal?

Replace the Speaker

Yes

Connect the cable properly or

replace the cable, if necessary.

Replace the SMPS

Replace the Main Board

4-8 Samsung Electronics

+ 36 hidden pages