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LN37D550K1FXZA 


Fast Track Troubleshooting Manual Rev - 1/11/12 



Part No. 


Inverter T-Con 


Power 


HELP: 1-888-751-4086; 1-866-894-0637 (FE) 
http://gspn3.samsungcsportal.com 

PLUS ONE 

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

HOT TIPS 

Power On Problems: (see page 2) 
Video Problems: (see pages 3,4) 

GSPN TIPS: 

No Tips listed 


SERVICE BULLETINS 

2 Oil LCD Option Byte Table 
ASC20110624001.pdf 


FIRMWARE 

No current changes as of 
12/29/11 

Be sure to check for latest SW 
updates. 

PARTS (Board Assemblies) 

Be sure to check for latest 
parts updates. 


DRIVER 

BOARD 


SPEAKER 




POWER 

PCB 


MAIN 

PCB 


LVDS 

CABLE 


SPEAKER 


Model Code 


Side Label 


Panel Module 


Main B'd 





LN37D550K1FXZA 


Fast Track Troubleshooting Manual 


IP Board 


Main Board ^2 1 

cnsoi 

CN1601_FHD 

PN12°Q CN302 I ^ 

I Speaker J I TCQN I 'Speaker 

^ — ” I ■ 


Driver 


Function&IR 


f ower On Sequence (approximate Voltages) 

. Standby Voltages: CN201-4 (5V) 

2. Power On CN201- 2(0 - 3.5V ) 

3. Low Voltage Supplies On CN201-l,3/7,9, 
11, 13 (Volts Listed on CN201) 

Back Light On CN201- 10(0-5V delayed) 
Back Light Confirm CNI802- "OVP" 
(approx 03 Volts Dim - .1 Volts bright) 
Dimming Signal CN201-14 (1V-4V approx) 


4. 

5. 


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. 



|| ^^CN201 (To Powr boardj^^ 

1 

65 V 

8 

GND 

2 

sum 

9 

SIM 

3 

65V 

10 

MERE 

4 

A5V 

11 

613V 

5 

GNO 

12 

NO 

6 

GND 

13 

613V 

7 

BI2VS 

H 

PIMM 

m 





0CN12G1 (FUNCTIONI 

1 

IR 

5 

MSDA 

2 

GND 

6 

FUNCINTR 

3 

A3.3V 

1 

LED_STB 

4 

MSCL 

8 

NC 


6 . 




Fast Track Troubleshooting Manual 




TROUBLESHOOTING VIDEO PROBLEMS ,, , 

T-Con Troubleshooting 


1. Verify Video Operation 

a. Boot Logo with power on 

b. Customer Picture Test in user menu 

c. "Display" (If display and Boot Logo & 
Customer Picture Test is OK the source or 
cables are first suspected . Then check for a 
defective input on the Main Board.) 

d. Substitute with known good Source 
(external DVD or Signal Generator to check 

inputs on Main Board) 

2. Using Test Patterns in Service Mode 

- ENTER SERVICE MODE - 

1. Select an active source signal since 
Test Pattern may rely on signal source to 

appear or select TV Source mode. 

Customer Remote Service Remote 

2. Power Standby 2. Power On 

3. Mute, 182, Power On 3. Info, Factory 




4. Select SVC 

5. Select Test Patterns 


3 






ON SCREEN FAILURE EXAMPLES: 


Fast Track Troubleshooting Manual 

ALIGNMENTS: 



If Picture & Display errors 
Defective Main Board, LVDS, 
orT-CON 



Green lines or a green screen 
defective main board , LVDS , or 
T-CON. 


1. Check/Set Option Bytes: in Service Mode 




Original Image Image on Screen 

Pixelization can be caused by the main board 
but is more commonly a source error 


Model 



Code 


Type 

Model 

Tuner 

Regio 

n 


LN37D550K1 

FXZA 

T-R- 

BLK 

37L6AF0C 

C 

LD550 

SI_ATC 




Vertical or Horizontal Lines :Defective 
Panel likely but also T-CON, LVDS, or Main 
Board. Use Test Patterns in Factory Service 
Mode to determine error) 


2. Check/Perform latest Firmware 
Upgrade for all repairs. 

3. Perform reset in Service Mode & 

Plug and Play if Main board is replaced. 

SPECIAL NOTES: 

Inform customer of reset of all 

Settings if Main Board or Panel is replaced. 

4