SAMSUNG DLP PROJECTION TVS FULL SERVICE HINTS GUIDE

SAMSUNG DLP PROJECTION TVs FULL Service Hints AND TROUBLESHOOT

 POWER SUPPLY BOARD AND VOLTAGES

VOLTAGES [CN-803]

			CN 803
PIN	1	2	3	4	5	6	7
SPEC	5VA	GND	33VB	GND	POWER-S/W	NC	NC

VOLTAGES [CN-802]

			CN 802
SPEC	POWER MUTE	S14-5VB	S-GND	S14-5VB	S-GND	5.7VB	GND
PIN	8	9	10	11	12	13
SPEC	12VB	GND	12VB	GND	70VB	GND

 

• Microprocessor [Generates turn ON signal to Power Board]
• Monitor LEDs.
• All Digital Video Processing.
• OSD | Menu.

 ANALOG BOARD

1. Distributes supply voltage from the power board to digital board.
2. Transfers Turn-On command from digital board to Power Board.
3. Encompasses the majority of the Audio Circuit.
4. Analog Video Switching | processing.

 

 

 DMD BOARD:

1. Controls Lamp Turn-On
2. Powers Color Wheel Motor.
3. Drives DMD panel.
4. Sensor Controls.
5. Attached to Light Engine.

DMD BOARD BLOCK DIAGRAM

ANALOG PRINTED CIRCUITS LAY OUT

DIGITAL BOARD LAY OUT

 SET DEAD [Troubleshooting]
Analog Board

• Power ON the set.
• Is Standby light [OP-103] lit on the analog board?  If 'Yes',  make sure CN 103 on digital board is connected.  If 'No', check and reconnect CN103.  If there is no problem found with this connection, replace Keypad.

• If indicator LED said above does not light, check the power to the analog board CN-245. 
• Unplug connector CN-245.  If LED turns On, replace the digital board.  It is faulty.
• If power to analog board CN-245 is not OK, unplug the Actuator Board.  If LED comes ON, replace Actuator.  Still LED does not light up, replace Power Board.

BLINKING TEMPERATURE LED
ACTUATOR BOARD.

1. Check temperature sensor connector [CN-106] on actuator board for any loose contact.  Unplug it and replug it for two times.  If it is found OK;
2. Install a Jumper across Temperature Sensor Terminals.  
3. If blinking stops, replace Tempertature Sensor.  It is faulty.
4. Still blinking occurs, Replace Actuator Board.

 
BOTH THE TIMER AND TEMPERATURE LEDs BLINKS

• Are fans running?  
• If yes, Replace Actuator Board.
• If fans do not tun, Check for 8Vdc at [CN103 & 104].
• If the voltage is present, replace fan. [Check which one is defective, and replace it]
• If the voltage at [CN-103&104] are not good;
• Check [CN-802 pin 8, 10] on the Power board for 12VB.
• If OK, Replace the Actuator board.
• If not good, Remove Power and check the DMD, Actuator and Digital boards for short circuit on 12V line go Ground.
• 
  

All the three front panel LED blinking is the most common fault.  It can be caused by Defective Lamp, Defective Color Wheel, Fan Failure or due to other defective components.  

• Check whether the Color Wheel run.  If it does not run, replace Color Wheel Assembly.  If Not Good, replace DMD board.
• The Color Wheel runs, and the Lamp is On with No Video.  In this case, check the connector CN-103 on the Digital Board.  If it is found OK, DMD board should be checked and repalced.
• Color wheel runs, lamp On.
• The Lamp does com ON, then shuts Off.

1. Check 220-280V DC to lamp ballast.  Measure this voltage at [CN-1] with a DC meter.
2. If it is not good, Replace Power Board.  If it is OK;
3. Re-Install Lamp Assembly.  If not good;
4. Check Pin-2 of [CN504-Lamp enable] on DMD board for 5V P-P.  If not good, Repalce DMD board.  If OK, Replace Lamp Assembly or Ballast.

Lamp come On, and shuts Off.

• Check [0V] at CN-504 [lamplitz] pin-5 on DMD board.  If found OK, Replace DMD board.  If not good, Replace Ballast or Lamp Assembly.

Color Wheel

Actuator

Lamp Ballast

 

First make sure that the lamp cover is installed properly.
Make sure that lamp cover switch is activating.

If not good, Check Boss on the Lamp Cover.  If OK;
Short CN-107 on the Actuator Board.
If not good, Replace the Actuator Board.

INITIALIZATION PROCESS

• Standby LED on Analog PCB ON [5V].
• Power ON signal from the Sub Front PCB or Infrared Sensor [IR sensor] to Digital PCB.
• Power ON signal generated by Digital PCB -> Analog PCB -> Power PCB.
• All other voltages turn On [Three Status LEDs on Analog Board lit]
• Fans turns ON.
• Fan Protection circuit verifies fan operation.
• Digital PCB tells DMD PCB to turn Color Wheel and Lamp On.
• The DMD | Digital PCBs check feedback  [lamplitz - low, DDP ready - high] signals from Lamp and DMD controller [DDP1011]
• If OK, Digital PCB tells DMD to remove 'Video Mute'.

LED BLINKING CODES

Timer	Lamp	Standby | Temp	Indication
OFF	OFF	ON	STANDBY STATE
ON	OFF	OFF	AUTO TIMER ON/OFF HAS BEEN SET
OFF	OFF	OFF	SET IS OPERATING NORMALLY
OFF	ON	OFF	TURN ON STATE, PICTURE WILL APPEAR IN ABOUT 15 SECONDS
BLINK	BLINK	OFF	AUTO TIMER ON/OFF HAS BEEN SET, PICTURE WILL APPEAR IN APPROXIMATELY 25 SECONDS
BLINK	OFF	BLINK	A COOLING FAN INSIDE THE SET IS NOT OPERATING PROPERLY
OFF	BLINK	BLINK	THE LAMP COVER ON THE REAR OF THE SET IS NOT INSTALLED PROPERLY
OFF	OFF	BLINK	EXCESSIVE TEMPERATURE ERROR, CHECK FOR PROPER VENTILATION
BLINK	BLINK	BLINK	LAMP DOES NOT LIGHT, REPLACE WITH NEW LAMP

                                                           SERVICE HINTS
PROBLEM:   Pixel defect, Vertical Line/s.  Change DMD Board assembly]
Color Wheel Assembly:  Increased Noise.  Change Color Wheel Module.
Lamp Assembly:  Low Brightness or No Power:  Change the Lamp Module.
Actuator:  High Frequency Noise [1200Hz] | Distorted edges in picture:  Change the Actuator.
ACTUATOR PROBLEM

ACTUATOR