LA15S51B Samsung TFT-LCD TV – Service mode and adjustments, Power and inverter schematic

Alignment Instruction

Do not attempt to connect or disconnect any wire while the TV is turned on.
Make sure that the power cord is disconnected before replacing any parts.
To protect against shock hazard, use an isolation transform.

Entering Factory Mode.

To enter “Service Mode” Press the remote control keys in this sequence:

Default data values

Calibration

RF, VIDEO,

S-VIDEO > Factory mode > Calibration > VCTi > Enter.

Component:  adjust 16 gray pattern of 480p.

Based on master device [Video signal generator MSPG-925F], after adjusting to 16 grey pattern [model: 212, pattern:17]

Factory mode > calibration > component > enter.

PC: adjust in VGA mode

Execute auto-adjustment in cross hatch: Model 10, Pattern 25.

After adjusting 16 grey pattern [Model 10, Pattern 17].

Factory mode > calibration > PC > enter

Value variation can be +/-- 10~20.

Power Supply, Inverter Board Schematic

42HFL5784D Philips 42” LCD TV USA – service mode, software upgrade, SMPS and Backlight inverter schematic

Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed.

Also, do not attempt these adjustments unless the proper equipment is available.

Equipment Required
1. Setup remote control
2. Color Analyzer,
CA-310 (KONICA MINOLTA Luminance meter) or
measuring instrument as good as CA-310.

To set up the service mode

1. Turn the power on.
2. Wait for the TV to go to Live mode.
3. Press [RC5 GUEST], [0], [6], [2], [5], [9], [6] and [RECALL/INFO] on the setup remote control in this order. The following screen will appear.

Purity Check Mode
This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the service mode.
2. Each time the [7] button on the setup remote control is pressed, the display changes as shown below.

3. To cancel or to exit from the Purity Check Mode, press [BACK/PP] button.

White Balance Adjustment

White Balance Adjustment should be performed when replacing the LCD Panel or Digital Main CBA.

Symptom of Misadjustment: White becomes bluish or reddish.

Operate the unit for more than 60 minutes.
2. Enter the service mode.
3. Press [TV VOL -] button three times on the setup remote control to select “Drive setting” mode. “Drive-” appears in the screen.
4. Set the color analyzer at the CHROMA mode and zero point calibration. Bring the optical receptor pointing at the center of the LCD-Panel.

[The optical receptor must be set perpendicularly to the LCD Panel surface.]
5. Press [3] button to select the “HDB” for High Drive Blue adjustment. (“HDB” appears in the screen.)
6. Press [HOME/MENU] button. The internal Raster signal appears in the screen. (“Internal (Single)” appears in the upper right of the screen as shown below.)

7. Press [P + or -] buttons to adjust the color temperature becomes 12000°K (x= 0.272 / y= 0.278 ±0.005).
8. Press [1] button to select the “HDR” for High Drive Red adjustment (“HDR” appears in the screen.) and press [P + or -] buttons to adjust the color temperature.
9. If necessary, adjust the “HDB” or “HDR” again.
10. Press [9] button to select the “LDB” for Low Drive Blue adjustment (“LDB” appears in the screen.) and press [P + or -] buttons to adjust the color temperature.

11. Press [7] button to select the “LDR” for Low Drive Red adjustment (“LDR” appears in the screen.) and press [P + or -] buttons to adjust the color temperature.
12. Press [8] button to select the “LDG” for Low Drive Green adjustment (“LDG” appears in the screen.) and press [P + or -] buttons to adjust the color temperature.
13. If necessary, adjust the “LDB”, “LDR” or “LDG” again.
14. Press [TV VOL -] button to shift to the “Debugging Message” mode.
If there is no message under “[WB]” section, this adjustment completes.
If “Drive settings are NG. Retry.” is displayed, repeat above steps from 5. to 13. Then check “Debugging Message” again. If “Drive settings are NG. Retry.” is displayed, replace the LCD Panel or Digital Main CBA.
15. To cancel or to exit from the White Balance Adjustment, press [BACK/PP] button.

To initialize the TV

Initialization is to place the set in a new out of box condition. The customer will be prompted to select a language and program channels after the set has been initialized.
To put the program back at the factory-default, initialize the LCD TV using the following procedure.

[Disconnect any device from the USB Port before you conduct on this procedure.]
1. Turn the power on.
2. Enter the service mode.
3. Press [RC5 GUEST] button on the setup remote control.
4. Press [RECALL/INFO] button to proceed with the self check mode.
5. Make sure to confirm the “INITIALIZED : OK” appear in the green screen.
6. Unplug the AC Cord and plug it back on again.
Note: To cancel the service mode, press [Power ] button on the setup remote control.

Firmware renewal

Upgrading of the TV software via IP, USB or RF. It also allows the configuration of the Auto Update feature to enable the TV to be automatically upgraded.
Note: Auto Update feature is only available with IP or RF upgrade.

Source: “IP”, “USB”, “RF” – This function allows you to select the Source from which the TV Upgrade data will be received.
Note: The USB source is bidirectional (TV can read from the USB or write to the USB), but IP and RF sources are read only.
Like the TV Clone function, the RF option requires a GNA installed in the property head end to broadcast the data to the TVs. For more information, contact your P&F sales representative.

Upgrade Type: “All”, “Software”, “Assets”, “Clone”, “P:I Key”
C This section allows you to select the type of software to be upgraded to the TV. (All 5 upgrade types are available if you select USB as source)
• If set to ALL, then all elements (Software, Assets, Clone and P:I Keys) will be upgraded, based on their version and the version check setting.
• If set to Software, the Stand-By MCU, SPI MCU and the SOC will be upgraded.
• If set to Assets, the slideshow graphic assets will be upgraded.

• If set to Clone, Setup menu settings and channel map elements will be upgraded.
• If set to P:I Key, the TV will attempt to switch mode to FTG or PPV, provided that the correct key for its serial number is present.
Of these, only the Assets and Clone types are bidirectional. The All, Software, and P:I Key types are read only. If either Assets or Clone is selected, an additional menu item, Direction, appears.

Direction:
• “To TV” (reads data from the USB, copies it to the TV)
• “From TV” (reads data from the TV, copies it to the USB

Version Check: “On”, “Off” - If set to Yes, this feature causes the TV to perform a version check of the TV upgrade software to ensure that only a newer version will be installed.

Start - This function will initiate the TV upgrading process.

Auto Update: “4 Hour”, “1 Hour”, “30 Min”, “10 Min” - When TV goes into standby, Auto Update will automatically check for new TV upgrades and upgrade the TV software and/or clone data after 4
hour, 1 hour, 30 min or 10 min if newer versions are found. Like all previous RF download functions, this too requires a GNA to be installed in the property head end.

RF Channel Number.
Indicates major. Minor channel where upgrading data is available.

Hotel TV mode

Capturing a Clonefile (TV to USB)
• All TV Setup menu settings and the TV channel map will be copied from the TV to the attached USB storage device.
• Any existing clone data on the USB storage device will be overwritten.
• All the key input and the shutdown timers will be invalid during the cloning process.
• Audio and Video will be muted during the cloning process.

How to capture a clone file from the TV to a USB storage device
1. Insert a USB storage device into the TV USB port. (It must have sufficient free space to hold a TV clone file - about 5 MB.)
2. Press the [RC5 SETUP] and [HOME/MENU] button on the setup remote control to enter the setup menu.
3. Scroll down to and select “Upgrades”.
4. Select “Source” and select “USB” then press the [OK] button.
5. Select “Type” and select “Clone” then press the [OK] button.
6. Select “Direction” and select “from TV” then press the [OK] button.
7. Select “Execute” and select “Start” then press the [OK] button.
8. After the successful completion, “Upgrade Completed! Press OK to continue” message appears on screen.

[Upon successful completion at Step 8, make sure to press the [OK] button once. If [OK] button is pressed twice, the cloning process will restart.]

Installing a Clonefile (USB to TV)
• All TV Setup menu settings and the TV channel map will be copied from the USB storage device to the TV.
• All the key input and shutdown timers will be invalid during the cloning process.
• Audio and Video will be muted during the cloning process.
• If any illegal data is encountered in the clonefile, the cloning process will be aborted.
• After the successful completion of the cloning process, the new set of values will be adopted by the TV.

To install a clone file from a USB storage device to the TV
1. Insert the USB flashdrive containing the clonefile into the TV USB port
2. Press the [RC5 SETUP] and [HOME/MENU] button on the setup remote control to enter the setup menu.
3. Scroll down to and select “Upgrades”.
4. Select “Source” and select “USB” then press the [OK] button.
5. Select “Type” and select “Clone” then press the [OK] button.
6. Select “Direction” and select “To TV” then press the [OK] button.
7. Select “Execute” and select “Start” then press the [OK] button.
8. After the successful completion, “Upgrade Completed.  Press OK to continue” message appears on screen.
9. After pressing OK, the TV will restart and initializewith the new values.

Status menu screen (optional)
1. Turn the power on.
2. Press the [RC5 SETUP] and [RECALL/INFO] button on the setup remote control in this order to display the status menu.
You can switch the screen by using [>] or [<] button.

3. Press the [BACK/PP] button to exit the status menu.

SMPS and back-light inverter schematic

Grundig Toronto 32-79232 T - GBH173 How to enter the service mode – default data values - SMPS schematics

Grundig - Vision 4 - 26-4940 T - GBH3626; 32-4840F T - GBH3532; 32-4940 T - GBH3632; 37-4940 T - GBH3637

Vision 6 - 32-6950 T - GBH4832; 37-6950 T - GBH4837; 42-6950 T - GBH4842

Service mode and Special Functions

i - call up/exit the dialog center/exit the service mode.

Up/Dn – call up the dialogue line.

OK  - call up the menus.

+/--  - changing settings.

Z  - sub menu: back to main menu

 Main menu: exit the service mode.

Calling up the Service Mode

Press button " i " (INFO)

Enter the code number "8500”

Exit the Service Mode

Press button " i "

Basic Settings [Default data]

Software Version Number
The software version number is shown on the lower part of the service menu and of the options, e.g

Channel Search
– Press button " i " (MAIN MENU)

– Select "CHANNEL SETUP" with the buttons "+ / –" and confirm with button "OK" ( ).
– Select "Auto Tuning" with the buttons "Up/Dn" and confirm with button "+"

– Select the required Country with the buttons "+ / –".
– Select "Scan Type" with the buttons "Up/Dn" and adjust with buttons "+ / –".

– Select "Time Zone" with the buttons "Up/Dn" and adjust with button "+ / –".
– Start "Channel setup" with the button "OK"
The auto programme system stops at every station of acceptable reception quality (AFC and coincidence) and stores the station data and the respective standard automatically. The system then continues searching.

Pressing the " i " button stops the programme search.

Hotel Mode
Maximum volume is limited and it is no access to "Setup" at activated hotel mode.

Call up: i >  "8500" > "OPTION 1" > "OK"  > "Hotel" > 12 "AVAIL"

Maximum volume: i > "8500" > "OPTION 1" > "OK"  >  "Hotel Volume" > 12Wert 0…63

Standby power schematic

Main power supply FSP2223-3F01

Main board

Main Power Supply FSP337-3F01, FSP361-3F01

LC26GD7E Sharp AQUOS LCD COLOUR TELEVISION (Display) – how to enter the service mode, software update, error codes, SMPS and inverter schematic

Sharp AQUOS Widescreen HD ready LCD TV – LC26GD7E

To Enter the service mode
Pre-setup position: set should be  in TV mode
1. Press MENU button on top of the TV set to enter menu „direct control on tv set“ (fig. 1, pos. 1)
2. Press button "P Up"until "service"is shown in menu (fig. 1, pos. 2)
3. When service appears press the MENU button on the remote control within 1 sec (fig. 2, pos. 3).
Service menu appears.
4. Step with cursor buttons on remote control (fig. 2, pos. 4) through the service menu to change settings.
5. Each modification of any value has to be memorized with the "OK" button on remote control (fig. 2, pos. 5).

Service menu L2650 (LCD)

Adjustment

The adjustment values are set to the optimum conditions at the factory before shipping. If a value should become

improper or an adjustment is required due to part replacement, make an adjustment according to the following
procedure.
1. Display adjustment procedure
1. Adjustment procedure
To Enter the display process mode and then adjust COM BIAS.

Caution: Use due care in handling the infomation described here lest your users should know how to enter the adjustment process mode. If the settings are tampered in this mode, unrecoverable system damage may result.

Adjustment process mode key operation table.

COM BIAS adjustment
Shift to the [COM BIAS] item with the cursor UP/DOWN key and select a numeric value with the cursor RIGHT/LEFT key.
Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. 

Make an adjustment so that the flicker near the center of the screen is minimized.

Lamp error detection
Feature description
This liquid-crystal color TV incorporates a lamp error detection feature (lamp error detection) that automatically turns OFF lamp drivers if any one lamp fails.
If anything is wrong with the lamp or lamp circuit or when the lamp error detection failure is activated for some reason, the following will result: All lamps are switched off the audio remains and green led keeps ON.
After switching on and off lamps go on for around 1 sec. until lamp error detected.

Measures
a) With lamp error in on mode (green led on) its possible to check the power supply (15 V for lamp inverters)
b) Test on inverter circuit is only possible in the first moment after switching on until protection circuit cuts driver signals for all lamps.
A simple test to find out which lamp inverter does not work: Check with oscilloscope the signal directly on core of inverter transformers.

Resetting of lamp error counter

After successful repair of lamps or the inverter circuit, you have to reset the lamp error counter through service mode.

For resetting go to LCD adjustments in service mode. With "Dn" go to panel service.
Press now first green button and then ok button on remote control

 (Attention: for protection the green button is not mentioned in on screen menu)

Red panel service menu comes up on screen.
Move cursor with "Dn" down to “L ERR Reset” and move to right side with “Right”button.
Press any cursor to reset lamp error to “0”.

After resetting to "0", perform an operational check to ensure that the lamp error detection feature is not activated.

Error codes [Monitoring process ERR STBY table]

Communication and power failures detected by the monitoring microcomputer are saved to EEPROM, and the final states of the errors can be checked in the monitoring process.

Location: Line 3 in page 0 of the monitoring process, ERR STBY field If there is no error, 0 appears. Value can be cleared to 0 using the cursor.

Red power LED: P2304 (RM), pin 8
Green : TP2301 (IC2301, pin 22)

Firmware update

Update of the main software (operating software)
To update the software you need the "Programmer" and the update program "Flasher".
Procedure
- Switch off the TV set with the mains switch.
- Connect the Programmer with the L-Link cable to the service socket at the TV.
- Start the Flasher software and select „Step 2“ (see fig. 1)

- Switch on the TV set with the mains switch now (TV does not switch on under this condition) – see fig. 2

- Software automatically jumps to "Step 3"
- Now select „Auto program“ (see fig. 3)

...and select the new software version (see fig. 4).

With selecting "Open" the update process will start automatically (see fig. 5).

- With the message "Flash programmed" the update is finished (fig. 6).

- Switch off the TV with the mains switch and disconnect the L-Link cable.

Update of the DVB Bootload- / Application software

To update the software you need the "Programmer" and the update program "Dvbpromer".

Follow steps 1-6 shown in the following pictures.

LED flashing patterns for error notification.  [Connect a LED to P2304 for blinking codes]

Power LED: P2304 (RM), pin 8
Alarm LED: TP2301 (IC2301, pin 22)

Power [SMPS] schematic

Inverter unit schematic

Inverter GND unit schematic

DVD Home Theater System LG LHD625 troubleshooting – PCB level – firmware update procedure, SMPS and Audio output schematic and voltages

LG (LHD625, S63S1-S, S63T1-C, S75T1-W) AMPLIFIER: Stereo mode 167 W + 167 W (3 Ω at 1kHz)

Hidden key mode

DISPLAY SYSTEM INFORMATION
1) Change function to DVD/CD by pressing input key, and wait until home menu is shown.
- Do not insert disc or USB at the set.
2) Go to SETUP menu by pressing SETUP button in HOME menu.

3) Move highlight at "DISPLAY > TV Aspect -> 16:9".

4) Press "1 > 3 > 9 > 7 > 1 > 3 > 9 > ENTER" in order.
5) and then, system reset menu is displayed

6) Power off and on by pressing POWER key.

EEPROM EDIT
1) Change function to DVD/CD by pressing input key, and wait until home menu is shown.
- Do not insert disc or USB at the set.
2) Press "PAUSE > 1 > 4 > 7 > 2" in order.
3) and then, option setting menu is displayed.
You can see 10 bytes option value.

4) Move a cursor by pressing Arrow < > key.

5) Press number 0 ~ 9, character a ~ f (1 ~ 6 for a while) for more than 5 seconds
6) Press "PAUSE" key to exit option setting menu.
After change option value, you need to make system reset.

DOOR LOCK / UNLOCK
1) Press Front “STOP” + Remote control “STOP” for more than 5 seconds.
2) “LOCKED” / “UNLOCKED” display on the VFD.

FIRMWARE UPGRADE

MPEG
1) Copy firmware to USB (Do not change file name).
Ex) LG_LHD655LD7_1501051.rom
2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.
3) Inset USB device which includes firmware.
4) Firmware is detected automatically and then, shows blue screen in TV.
 If home menu is maintained after inserting USB, press music icon.

5) Take off the USB and press PLAY key.

6) and then, upgrading get started.
- Do not turn off the set or uplug the unit from mains power sourse until upgrade is finished.
7) After finishing firmware upgrading, set will restart automatically.
8) Power off and on again by pressing POWER key.

AUDIO MICOM
1) Copy firmware to USB (Do not change file name).
Ex) LHD655_1501050.HEX
2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.
3) Inset USB device which includes firmware.
4) Firmware is detected automatically and then, shows blue screen in TV.
 If home menu is maintained after inserting USB, press music icon.

EQ
1) Copy firmware to USB (Do not change file name).
Ex) EQ_PRG.BIN
2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.
3) Inset USB device which includes firmware.
4) Firmware is detected automatically and then, shows blue screen in TV.
 If Home menu is maintained after inserting USB, press music icon.

5) Upgrading is started.
- Do not turn off the set until upgrade is finished.
- Do not pull out the USB device using firmware upgrading.
6) After finishing firmware upgrading, set will be turned off.

NO POWER PROBLEM
No power problem occurs when you power on the unit.

Fuse & Bridge diode
Replace F901, BD901 on SMPS board.
1) Look at the physical state of fuse F901.
2) Check the bridge diode BD901.

No power problem occurs when you power on the unit.

VFD, 14 VA, 5.5 VA
Replace D922, D923, D924, D925, D926, D927, IC901.
Case 1) FLD abnormal: Check D950, D951, ZD951, ZD952, FR950 and replace it.
Case 2) 5.5 VA abnormal: Check D952, D953 and replace it.
Case 3) 14 VA abnormal: Check D955, D956 and replace it.
Case 4) All voltage abnormal: Check IC901 and replace it.

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON FRONT PANEL
When you turn on your set, it will blank / no message on front panel, and stand-by LED no working.
IC103 (No 3.3 VA)
Replace IC103 on MAIN board.
 1) Check 3.3 VA of IC108.
2) If 3.3 VA is abnormal, please check 5.5 VA of IC103 pin1.
3) If 5.5 VA is OK, but 3.3 VA is abnormal, replace IC103.

When you turn on your set, it will blank / no message or Welcome on front panel, and it will not boot-up.

IC105 System 3.3 V (No System 3.3 V)
Replace IC105 on MAIN board

How to troubleshoot
1) Please check 5.5 VA of IC105 pin3 (VIN).
2) If 5.5 VA is abnormal,  check SMPS 5.5 VA.
3) If 5.5 VA is OK, but 3.3 V is abnormal at the IC105 pin6 (VOUT), replace IC105.

When you turn on your set, it will display “WELCOME” on front panel, and it will not boot-up normally.

Xtal 500
Replace X500 on MAIN board.

1) Check the soldering status of 27 MHz crystal (X500).
2) Check the frequency of 27 MHz crystal (X500).
3) If the crystal doesn’t oscillate, replace X500.
4) After changing it, if the set is still not booting :
- Check Serial Flash IC (IC504)
- Check SDRAM IC (IC503)
- Check MT1389 IC (IC500).

When you turn on your set, it will display “WELCOME” on front panel, and it will not boot-up normally.

IC503 (SDRAM MEMORY)
Replace IC503 on MAIN board.

1) Check 3.3 V IC503.
2) If it doesn’t work even though IC105 is no problem, IC503 (DDR memory) could have problem.
3) After changing it, if the set is still not booting : Check MT1389IC

When you turn on your set, it will display “WELCOME” on front panel, and it will not boot-up normally

IC500 (MPEG IC)
Replace IC500 on MAIN board.

1) Check 1.2 V of C510 on main board.  Check 3.3 V of C548 on main board.
2) If it doesn’t work even though IC105 is no problem, IC500 (MT1389) could have problem.

BAD HDMI VIDEO / AUDIO OUTPUT
When unit is connected to HDMI TV using HDMI cable, picture shows bad color, no output or mixed color on the screen. But component output is OK.

JK501 (HDMI JACK)

Replace JK501 (HDMI Jack)

1) Check JK501 pin soldering.
2) If there is short soldering on pin JK501, re-soldering pin JK501.
3) If problem still occurs, check HDMI data.
- If all data OK, replace JK501.
- If data NG, check set on BD mode :
Replace IC500

NO AUDIO FROM SPEAKER
When unit is connected to speaker, no audio from speaker

IC601 (PWM IC)
Replace IC601 (PWM IC).

How to troubleshoot
1) Check IC601 pin soldering.
2) If there is short soldering on pin IC601, re-soldering pin IC601.
3) If problem still occurs, check AMP IC (IC700, IC701, IC702).
- Check IC700, IC701, IC702 pin soldering.
- If soldering OK, check the AMP heat sink :
Replace IC700, IC701, IC702

BT connection error

BT module
Replace BT module on Main chassis

1) Check your BT device. Make sure that BT function is on-state.
2) If it is OK, please check the CN201.
3) If there is soldering problem, please re-soldering pin CN201.
4) If after re-soldering problem still occurs, replace BT module.
5) If problem still occurs after change BT module, check MT1389 IC (IC500)

SMPS – Audio output and voltage chart