Thursday, February 12, 2015

PHILIPS 23PF9946 LCD TV ERROR CODE AND FAULT FINDING TIPS

PHILIPS 23PF9946


ERROR CODE AND FAULT FINDING TIPS 

ERROR CODES
Error
Device
Error description
0
Not applicable
No Error
1
Not applicable
-
2
Not applicable
-
3
Not applicable
-
4

GM1501

I2C error while communicating with the Genesis Scaler and/or Flash-ROM is
faulty/empty

5

Not applicable

+5v protection
6
I2C bus
General I2C error
7
Not applicable
-
8
M24C32
I2C error while communicating with the Scaler EEPROM
9
M24C16
I2C error while communicating with the EEPROM
10
Tuner
I2C error while communicating with the PLL tuner
11
UPD64083
I2C error while communicating with the 3DYC Combfilter
12
Not applicable
-
13
SII9993CT
I2C error while communicating with the HDMI Decoder
14
K4D263238M
Read-write error with the Scaler SDRAM
15
TDA9178T/N1
I2C error while communicating with Histogram
16
EPIC12F
I2C error while communicating with EPLD on Pixel Plus panel

The Blinking LED Procedure
Using this procedure, you can make the contents of the error buffer visible via the front LED. This is especially useful when there is no picture. When the SDM is entered, the front LED will blink the contents of the error-buffer:
• The Led blinks with as many pulses as the error code number, followed by a time period of 1.5 seconds, in which the Led is off.
• Then this sequence starts is repeated. Any RC5 command terminates this sequence.
Example of error buffer: 12 9 6 0 0
After entering SDM, the following occurs:
• 1 long blink of 5 seconds to start the sequence,
• 12 short blinks followed by a pause of 1.5 seconds,
• 9 short blinks followed by a pause of 1.5 seconds,
• 6 short blinks followed by a pause of 1.5 seconds,
• 1 long blink of 1.5 seconds to finish the sequence,
• The sequence starts again at 12 short blinks.
Fault Finding and Repair Tips
Notes:
• It is assumed that the components are mounted correctly with correct values and no bad solder joints.
• Before any fault finding actions, check if the correct options are set.
NVM Editor
In some cases, parts of the NVM contents need to be changed. This can be done with the “NVM Editor” option in SAM mode. With this option single bytes can be changed.
Load default NVM values
In case a blank NVM is placed or when the NVM content is corrupted, default values can be downloaded into the NVM. After the default values are downloaded it will be possible to
start up and to start aligning the TV set. This is no longer initiated automatically; to initiate the download the following action has to be performed:
1 . Switch off the TV set via the mains switch
2 . Short circuit the SDM jumpers (keep short circuited)
3 . Press P+ or Ch+ on the local keyboard (and keep it pressed)
4 . Switch on the TV set via the mains switch
5 . When the set has started up the P+/Ch+ button can be released and the short circuit of the SDM jumpers can be removed.
6 . The red LED will be on continuously to indicate that the download is initiated (normally when SDM is activated the red LED will start with the Blinking LED sequence).
7 . Wait +/- 30 Seconds (time needed to download default values to the NVM) Result: The set is in SDM, the NVM is loaded with default values and the blinking LED is not activated (The blinking LED is not activated in this case to show that the download has been performed), the LED will be on.
Tuner and IF
No Picture in RF mode
1 . Check whether picture is present in AV. If not, go to Video processing troubleshooting section.
2 . If present, check that the Option settings are correct.
3 . Check that all supply voltages are present.
4 . Check if I2C lines are working correctly (3.3V).
5 . Manually store a known channel and check if there is IF output at Tuner pin 11.
6 . Feed in 105 dBuV at Tuner pin 11 and check whether there is RGB output from Video Processing IC. If yes, Tuner may be defected. Change Tuner.
Sound in picture problem for L' system (rolling horizontal lines)
1 . Check whether AGC L' in Sam mode is set to 0.
2 . If yes, align the set to correct value.
Required system is not selected correctly
1 . Check whether the Service jumper (#4022, 08 05 size) is present. If yes, remove it.
2 . Check whether SEL_IF pin is according to what is specified.
Video Processing
No power
1 . Check +12 V and 3V3 at position 1910.
2 . If no supply, check the connector 1910.
3 . If it is correct, check the power supply board.
Power supply is correct but no green light
1 . Check the two connectors 1005 and 1601, if they are properly inserted.
2 . If they are inserted correctly, check if the 3V3 is present.
No picture display
1 . Check the RGB signal.
2 . If it is present, check 3-IC7016 (NE555).
3 . If it has output, the problem is in SCALER part.
4 . Otherwise, check H-out on pin 2 of NE555. If the input signal of pin2 is present, but no output, the IC is failed.
Note:
• If the H-out (pin 67) doesn’t have signal or the level is low, check the output of NE555 (pin 3) during start up.
• If the H-out (pin 67) has a signal (or has a signal for a very short time), change IC7016 (NE555).
No TV but PC is present
1 . Check if HSYNC and VSYNC are present at PIN 3 of 7071 and 7015.
2 . If they are present, check RGB output.
3 . If there is no RGB output, the IC TDA120xx can be failed.
Comb Filter not working
1 . Check the option bit 5 in SAM.
2 . Check NVM setting. Address 1229 is 0000
Power Supply
Check fuses
This power supply contains three fuses. One is near the mains inlet (marked on the board as 1102) and two other are near the output connectors (marked 1610 and 1660).
1 . Check with power supply in off state by means of ohmic measurement.
2 . Fuse 1102 may open in case of severe lightning strikes and/or failures in the power supply. Despite the fact, that this fuse is mounted in a fuse holder and the marking text on the board, it is not meant to be field replaceable.
3 . Fuses 1610 and 1660 may open in case a severe overload of the 12 V outputs. Replacement of the power supply is needed, but not before the cause of the overload
conditions is resolved.
Standby mode
1 . Apply a 12 ohm load resistor of sufficient power rating to all outputs (+3 V3, +12 VAL, +12 VL and +24 V). Connect the STBY pin to GND.
2 . Over an input voltage range of 90 V_ac to 264 V_ac only the +3 V3 output shall be up and within regulation (±5%).
The voltage on the POWER DOWN pin shall be < 0.3 V at an input voltage below 160 V_ac, and 3.3 V ±10% at an input voltage higher than 240 V_ac.
Normal mode:
1 . Apply a 12 ohm load resistor of sufficient power rating to all outputs (+3 V3, +12 VAL, +12 VL and +24 V). Connect the STBY pin to the +3 V3 output.
2 . Over an input voltage range of 90 V _ac to 264 V_ac all outputs shall be up and within regulation (±5%). The voltage on the POWER DOWN pin shall be 3.3 V ±10% over the entire input voltage range. Additionally, the voltage on the big capacitor mounted flat on the PCB shall be 400 V ±10%.
Alignments
General: The Service Default Mode (SDM) and Service Alignment Mode (SAM) are described in chapter 5. Menu navigation is done with the cursor Up, Down, Left or Right keys
of the remote control transmitter.
General Alignment Conditions
Perform all electrical adjustments under the following conditions: Mains voltage and frequency: 100-240 V / 50/60 Hz. Allow the set to warm up for approximately 10 minutes.
Test probe: Ri > 10 M ohm; Ci < 2.5 pF
Hardware Alignments
There are no hardware alignments foreseen for the LCD-TV.
Software Alignments
With the software alignments of the Service Alignment Mode (SAM) the geometry, white tone and tuner (IF) can be aligned. To store the data: Use the RC button Menu to switch to the main menu and next, switch to ‘Stand-by’ mode.
White Tone
In the White Tone sub menu the colour values for the colour temperature values can be changed. The colour temperature mode (Normal, Delta Cool, Delta
Warm) or the colour (R, G, B) can be selected with the Right/ Left cursor keys. The mode or value can be changed with the Up/Down cursor keys. First the values for the Normal colour temperature should be selected. Range: 0-255, 128 represent the middle of the value (no offset difference). Then the offset values for the Delta Cool and Delta Warm mode can be selected. Note that the alignment values are non-linear. The range is: -50 to +50, 0 represents the middle value, (no offset difference). Input signal strength: >=10 mV rms (80 dBµV) terminal voltage.  Input injection point: Aerial input.
Alignment Method
Initial Set-up
• 12 minutes soaking time before carrying out Colour Temp alignment.
• Incredible Picture/Contrast+ and Active Control & Light Sensor must be switched Off for proper tracking.
• Set all colour temperature settings to their initial values, i.e. Red=135; Green=128; Blue=133.
• The offset values for Cool & Warm should be preloaded into NVM.
• The alignment is done for Normal only.
Method of alignments
1 . Place the colour sensor of the meter at the centre of the screen with standard orientation (at 0 degree orientation).
2 . Set the meter in (T, delta UV, Y) mode.
3 . Set Brightness and Colour to nominal (Factory mode, Brightness 60).
4 . Set Colour temp to normal.
5 . Set Contrast to make the light output Y on the meter 250 nit +/-10%.
6 . Set Green=128.
7 . Adjust Red and Blue to bring delta UV and T to the value as in the table.
8 . Repeat the procedure if necessary to obtain the values
Tuner Adjustment
AGC (RF AGC Take Over Point) Set pattern generator (e.g. PM5580) with colour bar pattern and connect to aerial input with RF signal amplitude - 10mV and set frequency for NTSC to 61.25 MHz.
• Activate the SAM-menu. Go to the sub-menu Tuner, select the sub-menu option AFC Window and adjust the value to 100kHz.
• Select the AGC sub-menu.
• Connect a DC multi-meter to F306 pin1 of the tuner.
• Adjust the AGC until the voltage at pin 1 of the tuner is 3.3 Volts +0.5 / -1.0.
• The value can be incremented or decremented by pressing the right/left Menu-button on the RC.
• Switch the set to standby to store the data.
Grey Scale Adjustment
SDTV Grey Scale Adjustment
Equipment and setting
• E.g. Fluke 54200 or Philips PM5580.
• 100% “8-step grey scale” pattern.
Alignment Method
• Switch to TV mode,
• Press the MUTE button on RC,
• Set SMART PICTURE to SOFT mode,
• Activate the auto color function by pressing key-sequence: "INFO - MUTE - MUTE - MUTE - INFO - MENU - INFO”
Analog PC Grey Scale Adjustment
Equipment and setting
• Quantum Data 802B.
• PC input signal, with 64 levels Grey scale pattern, 1024x768 @ 60Hz (Format= 81:DMT1060, Pattern= 123:Grey 64).
• PC input at D-sub VGA connector.
Alignment Method
• Switch to “PC” mode.
• Press the MUTE button on RC.
• Set BRIGHTNESS and CONTRAST to nominal “50”.
• Activate the auto color function by pressing key-sequence: "INFO - MUTE - MUTE - MUTE - INFO - MENU - INFO”.
HD Grey Scale Adjustment
Equipment and setting
• Quantum Data 802B.
• HD input signal, Top half 100% color bar and bottom half Grey scale pattern,1920x1080i@60Hz YPbPr (Format= 1080i30, Pattern= HDBar100).
• HD input at D-sub VGA connector.
Alignment Method
• Switch to HD mode.
• Press the MUTE button on RC.
• Activate the auto color function by pressing key-sequence: "INFO - MUTE - MUTE - MUTE - INFO - MENU - INFO”.
Sound
No adjustments needed for sound.
The default values for the audio alignments are:
• QSS: On
• FMI: Off
• NICAM Alignment: 63
• Lip Sync: Off
• DBE: Off