Technical description and composition of the PANASONIC TX-49FXR740 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-49FXR740
Chassis / Version: LA76
Panel: LC490EGE (AL) (A1)
T-CON: 6870C-0780A
LED driver (backlight): integrated into MainBoard
PWM LED driver: BD9479FV - GE2
MOSFET LED driver: P13F28HP2
Power Supply (PSU): TNPA6704 1 P
PWM Power: FA5696N, FA6B02N, BD9E102FJ
MOSFET Power: TK10A60W, TK7A60W
MainBoard: TNPH1197 1A
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: 24H133A J3ACZAC00005
Control: WI FI: N5HBZ0000120
TX-49FXR740 Specifications
PANASONIC TX-49FXR740
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- PANASONIC TX-49FXR740 does not turn on, does not respond to buttons and the remote control, indicators on the front panel do not light or flash.
In such cases, you should start looking for a fault in the circuits of the TNPA6704 power supply. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (TK10A60W, TK7A60W) and rectifier diodes for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency in the short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FA5696N, FA6B02N, BD9E102FJ are usually checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
Usually, in such cases, there is no backlighting of the LED panel (matrix). Most often the reason for this is a break in the LEDs, or poor contact in the connectors of the brackets, less often the LED driver may be faulty.
It is impossible to check the line of series-connected LEDs without a special current source, and it is unsafe for them to use any voltage sources above 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Usually, Chinese multimeters with 9V power supply lightly light one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the TNPH1197 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Repair of the board and replacement of CPU, eMMC, DRAM, AUDIO, DC / DC microcircuits are made if the necessary equipment and the corresponding element base are available. Malfunctions associated with the use of BGA soldering technologies can be localized by the warm-up method.
If the TV operates normally from external devices, but does not tune to TV channels, the 24H133A J3ACZAC00005 tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Attention! Users and owners of TX-49FXR740 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TNPA6704 Power supply
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LA76 Chassis for models TX-49FX740E, TX-49FXR740
You can download the file and update instructions on the manufacturer's website for the TX-49FXR740 model.
Update results:
Date / Version Additions / Changes
Jul, 30, 2019 Version 3.091 Improved system stability.
Oct, 30, 2018 Version 3.074 Support control from the Google Assistant / Amazon Alexa devices. Improved system stability.
Aug. 30, 2018 Version 3.061 Improved system stability.
Jun. 27, 2018 Version 3.052 Improved system stability.
Once again, we remind users and TV owners.
Self-repair attempts can have serious negative consequences, up to complete non-repairability.
The appearance of the MainBoard TNPH1197 is shown in the figure below:TNPH1197
External view of the power supply
Main features of the PANASONIC TX-49FXR740 device:
Installed matrix (LED panel) LC490EGE (AL) (A1).
Matrix control uses the 6870C-0780A Timing Controller (T-CON).
To power the backlight LEDs, a converter combined with the TNPH1197 main board is used, controlled by the BD9479FV - GE2 PWM controller. The keys of the P13F28HP2 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-49FXR740 TV is carried out by the TNPA6704 power module, or its analogs using the FA5696N, FA6B02N, BD9E102FJ microcircuits and power switches of the TK10A60W, TK7A60W type.
MainBoard - the main board (motherboard) is a TNPH1197 module using CPU, eMMC, DRAM, AUDIO, DC / DC chips and others.
Tuner 24H133A J3ACZAC00005 provides reception of television programs and tuning to channels.
TV PANASONIC TX-49FXR740 with LCD display LC490EGE, diagonal size 48.5 "(123 cm) 16: 9. The required brightness of the screen of 480 cd / m2 is provided by LED backlight LED. The LED panel of this TV is implemented with LED edge lighting - Edge LED.
LC490EGE display The TNPH1197 software is capable of displaying images in high quality UHD 4K at a resolution of 3840x2160 pixels in the graphics standard 4K UHD, HDR. Graphic image processing is carried out using modern High Dynamic Range (HDR) technologies with an extended range of brightness gradations.
The TX-49FXR740 is equipped with SMART software, built-in applications and Internet connectivity. Internet connection can be made via Wi-Fi wireless connection. Multimedia file formats supported by the video processor: MP3, WMA, MPEG4, HEVC (H.265), MKV, JPEG.
The power of the acoustic audio system is 20 W (2x10 W), provided by two speakers. Uses NICAM stereo signal system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x3, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac. A headphone output is provided for individual listening.
The digital tuner is capable of receiving terrestrial and cable channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The power consumed by the TV in operating mode from the network is 181 watts.
Dimensions: with stand 1098x699x254 mm, without stand 1098x641x54 mm.
TV weight: with stand: 27 kg, without stand: 22 kg.
Attention! The LC490EGE (AL) (A1) panel of the PANASONIC TX-49FXR740 LED TV is the most expensive element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
Liquid spillage on the screen is unsafe. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
