Category: LCD Television Repair and Service
Contents of this article
- Service mode Access
- Color Calibration
- Troubleshooting
- Power supply circuit diagram
SAMSUNG LA22C350D1 - LA26C350D1 - LA32C350D1
SERVICE MODE
Entering Factory Mode
To enter ‘Service Mode’ Press the remote -control keys in this sequence :
If you do not have Factory remote - control
INFO > MENU > MUTE > Power on
If you have Factory remote - control
INFO > FACTORY
The buttons are active in the service mode.
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -, Menu, TV/VIDEO(Enter)
Entering Factory Mode
To enter ‘Service Mode’ Press the remote -control keys in this sequence :
If you do not have Factory remote - control
INFO > MENU > MUTE > Power on
If you have Factory remote - control
INFO > FACTORY
The buttons are active in the service mode.
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -, Menu, TV/VIDEO(Enter)
Method of Color Calibration
(AV)
1) Apply the NTSC Lattice (N0. 3) pattern signal to the AV IN 1 port
2) Press the Source key to switch to “AV1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “AV Calibration" menu.
6) In “AV Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “AV Calibration" status from Failure to Success.
Method of Color Calibration (Component)
1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port
2) Press the Source key to switch to “Component1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “Comp Calibration" menu.
6) In “Comp Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “Comp Calibration" status from Failure to Success.
Method of Color Calibration (PC)
1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port
2) Press the Source key to switch to “PC" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “PC Calibration" menu.
6) In “PC Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “PC Calibration" status from Failure to Success.
Method of Color Calibration (HDMI)
1) Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port
2) Press the Source key to switch to “HDMI1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “HDMI Calibration" menu.
6) In “HDMI Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “HDMI Calibration" status from Failure to Success.
1) Apply the NTSC Lattice (N0. 3) pattern signal to the AV IN 1 port
2) Press the Source key to switch to “AV1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “AV Calibration" menu.
6) In “AV Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “AV Calibration" status from Failure to Success.
Method of Color Calibration (Component)
1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port
2) Press the Source key to switch to “Component1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “Comp Calibration" menu.
6) In “Comp Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “Comp Calibration" status from Failure to Success.
Method of Color Calibration (PC)
1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port
2) Press the Source key to switch to “PC" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “PC Calibration" menu.
6) In “PC Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “PC Calibration" status from Failure to Success.
Method of Color Calibration (HDMI)
1) Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port
2) Press the Source key to switch to “HDMI1" mode
3) Enter Service mode
4) Select the “Calibration" menu
5) Select the “HDMI Calibration" menu.
6) In “HDMI Calibration Off" status, press the “ > " key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “HDMI Calibration" status from Failure to Success.
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.
Check internal Pattern lola3 if fhere is some picture noise.
Factory mode(Info-MENU-Mute-power on > Advanced menu > MST69A84HQ > Pattern select : Off Press right button of Remocon. If lola3 NG, Change the Main Board.
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.
Check internal Pattern lola3 if fhere is some picture noise.
Factory mode(Info-MENU-Mute-power on > Advanced menu > MST69A84HQ > Pattern select : Off Press right button of Remocon. If lola3 NG, Change the Main Board.
No Power
Symptom
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.
Checkpoints
The IP 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.
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.
Checkpoints
The IP 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.
No Video (Analog PC signal)
Symptom
Symptom
Audio is normal but no picture is displayed on
the screen.
Checkpoints
Check the PC source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Checkpoints
Check the PC source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (Tuner_CVBS)
Symptom
Symptom
Audio is
normal but no picture is displayed on the screen.
Checkpoints
Check the Tuner CVBS source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Checkpoints
Check the Tuner CVBS source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (HDMI - Digital
Signal)
Symptom
Symptom
Audio is
normal but no picture is displayed on the screen.
Checkpoints
Check the HDMI source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Checkpoints
Check the HDMI source
Check the M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Sound
Symptom
Video is
normal but there is no sound.
Checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning.
Speaker defect.
Checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning.
Speaker defect.
ICs USED IN SMPS
FAN7530
DESCRIPTION
The FAN7530 is an active power factor correction (PFC) controller
for the boost PFC applications that operates in critical conduction mode (CRM).
It uses the voltage mode PWM that compares an internal ramp signal with the
error amplifier output to generate MOSFET turn-off signal. Because the voltage
mode CRM PFC controller does not need the rectified AC line voltage information,
it can save the power loss of the input voltage sensing net- work necessary for
the current mode CRM PFC controller.
FAN753O provides many protection functions such as over
voltage protection, open-feedback protection, over- current protection, and
under-voltage lockout protection. The FAN7530 can be disabled if the INV pin
voltage is lower than 0.45\/ and the operating current decreases to 65uA. Using
a new variable on-time control method, THD is lowerthan the conventional CRM
boost PFC lCs.
PIN
CONFIGURATION
1 INV - This pin is the inverting input of the error
amplifier. The output voltage of the boost PFC converter should be resistively
divided to 2.5V.
2 MOT - This pin
is used to set the slope of the internal ramp. The voltage of this pin is main-
tained at 3V. If a resistor is connected between this pin and GND, current
flows out of the pin and the slope of the internal ramp is proportional to this
current.
3 COMP - This pin
is the output of the transconductance error amplifier. Components for the out- put
voltage compensation should be connected between this pin and GND.
4 CS - This pin is the input of the over-current
protection comparator. The MOSFET current is sensed using a sensing resistor
and the resulting voltage is applied to this pin. An internal RC filter is
included to filter switching noise.
5 ZCD - This pin
is the input of the zero current detection block. If the voltage of this pin
goes higherthan 1.5V, then goes lowerthan 1.4V, the MOSFET is turned on.
6 GND - This pin
is used for the ground potential of all the pins. For proper operation, the
signal ground and the power ground should be separated.
7 OUT - This pin
is the gate drive output. The peak sourcing and sinking current levels are +500mA
and -800mA respectively. For proper operation, the stray inductance in the gate
driving path must be minimized.
8 Vcc - This pin
is the IC supply pin. lC current and MOSFET drive current are supplied using this
pin.
ICE3BR0665J
Description
The CoolSET-F3R jitter series (ICE3BRxx65J) is the latest version of CoolSET-F3. It targets for the Off-Line battery adapters and low cost SMPS for lower power range such as application for DVD R/W, DVD Combi, Blue ray DVD player, set top box, etc. Besides inherited the outstanding performance of the CoolSET-F3 in the BiCMOS technology, active burst mode, auto-restart protection, propagation delay compensation, etc., CoolSET-F3R series has some new features such as built-in soft start time, built-in blanking window, built-in frequency jitter, soft gate driving, etc. In case a longer blanking time is needed for high load application, a simple addition of capacitor to BA pin can serve the purpose. Furthermore, an external auto-restart enable feature can provide extra protection when there is a need of immediate stop of power switching.
The CoolSET-F3R jitter series (ICE3BRxx65J) is the latest version of CoolSET-F3. It targets for the Off-Line battery adapters and low cost SMPS for lower power range such as application for DVD R/W, DVD Combi, Blue ray DVD player, set top box, etc. Besides inherited the outstanding performance of the CoolSET-F3 in the BiCMOS technology, active burst mode, auto-restart protection, propagation delay compensation, etc., CoolSET-F3R series has some new features such as built-in soft start time, built-in blanking window, built-in frequency jitter, soft gate driving, etc. In case a longer blanking time is needed for high load application, a simple addition of capacitor to BA pin can serve the purpose. Furthermore, an external auto-restart enable feature can provide extra protection when there is a need of immediate stop of power switching.
PIN CONFIGURATION
1 BA - extended Blanking & Auto-restart
2 FB - FeedBack
3 CS - Current Sense/ 650V1) CoolMOS Source
4 Drain - 650V CoolMOS® Drain
5 Drain - 650V CoolMOS® Drain
6 n.c. - Not connected
7 VCC Controller Supply Voltage
8 GND - Controller GrouND
1 BA - extended Blanking & Auto-restart
2 FB - FeedBack
3 CS - Current Sense/ 650V1) CoolMOS Source
4 Drain - 650V CoolMOS® Drain
5 Drain - 650V CoolMOS® Drain
6 n.c. - Not connected
7 VCC Controller Supply Voltage
8 GND - Controller GrouND
POWER SUPPLY SCHEMATIC DIAGRAM
CLICK ON THE IMAGES TO ZOOM IN
