Samsung LN40D550K1FXZA Schematic

LN40D550K1FXZA

MAIN

Include Board Assy names (as appearing in parts) and any

PCB

Insert Photo of TV Board Layout

special labels/items (i.e. Plasma voltage label)

LVDS

CABLE

SPEAKER

Fast Track Troubleshooting Manual Rev - 1/11/12

POWER

T-CON PCB

(under shield)

PCB

SPEAKER

HELP : 1-888-751-4086; 1-866-894-0637 (FE)

http://gspn3.samsungcsportal.com

DRIVER
BOARD

SERVICE BULLETINS

2 011 LCD Option Byte Table
ASC20110624001.pdf

FIRMWARE

No current changes as of

1/11/12

Be sure to check for SW updates.

PARTS (Board Assemblies)

Be sure to check for latest parts
updates.

PLUS ONE

http://my.plus1solutions.net/clientPortals/samsung

HOT TIPS

Power On Problems: (see page 2)
Video Problems: (see pages 3,4)
TIP If the unit has a vertical yellow

colored line that is one pixel wide in
the video, verify that it also affects the
OSD. If so, replace the panel. If it does
not affect the OSD and is in multiple
sources, replace the main board.

1

Fast Track Troubleshooting Manual LN40D550K1FXZA

Wiring Diagram

Include Connector Numbers , References, and

Locations.

SW-P

Power On Sequence (approximate Voltages)

)

1. Standby Voltages: CN201-4 (5V)

2. Power On CN201- 2(0 – 3.5V )

3. Low Voltage Supplies On CN201-1,3,7,9,

11, 13 (Volts Listed on CN201)

4. Back Light On CN201- 10(0-5V delayed)

5. Back Light Confirm CNI802- “0VP”

(approx 03 Volts Dim - .1 Volts bright)

6. Dimming Signal CN201-14 (1V–4V

approx)

To Force Backlight On
without Main Board :

1. Remove Power Cord

2. Remove CN 801

3. Plug Power Cord In.

4. Backlight should be
on immediately.

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