Technical description and composition of the PANASONIC TX-42ASR600 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-42ASR600
Chassis / Version: KM26E
Panel: V420FWSD09 14043MC001007 REV A
T-CON: 6870C-0480A
LED driver (backlight): TNPA5935 1
PWM LED driver: BD9486F-GE2 (C0ZBZ0002179)
MOSFET LED driver: B1CERM000055
Power Supply (PSU): TNPA5916 1
PWM Power: C0DBBYY00058, C0DBAYY01329
MOSFET Power: B1CFRR000028, B1CERR000096
MainBoard: TNP4G568 A
IC MainBoard: CPU: PEAKS-sLD8A, LNBH29PT (PWM)
Tuner: TDSA-G320D
Control: IR: TNPA5915 1, WLAN: DNUA-P75
TX-42ASR600 Specifications
PANASONIC TX-42ASR600
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- PANASONIC TX-42ASR600 does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In some of these cases, the main switching power supply, the TNPA5916 module, is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (B1CFRR000028, B1CERR000096) and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) C0DBBYY00058, C0DBAYY01329, if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- 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.
The most likely problem in these cases is a malfunction of the LED backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To test the LED strips, in order to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED junctions in forward bias, you can sometimes detect the presence of a protective zener diode PN junction by connecting the probes in the opposite direction. If the zener diode is cut off or broken in K / Z, then the LED is faulty and needs to be replaced.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the TNP4G568 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Repair of the board and replacement of LNBH29PT (PWM) microcircuits are performed 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 into TV channels, the TDSA-G320D 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.
If the PANASONIC TX-42ASR600 has no image, but there is sound, the backlight of the V420FWSD09 display often simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the V420FWSD09 LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.
In this case, the panel may also be faulty - damage to strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But often the main board MainBoard TNP4G568 also turns out to be faulty, a software failure is also possible.
Then, first of all, it is necessary to check the panel supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within the normal range, it is necessary to trace the passage of LVDS signals from the MainBoard TNP4G568 with an oscilloscope, as well as synchronization signals to the loops with drivers.
Flooded or unsuccessfully washed screens of LED-TVs can be restored, in about half of the cases, usually if significant damage has not formed in the cables and panel strips.
Once again, we remind TV users: you should not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-42ASR600 Chassis KM26E
The MainBoard TNP4G568 is shown in the figure below:TNP4G568
External view of the power supply
The main features of the PANASONIC TX-42ASR600 device:
Installed matrix (LED panel) V420FWSD09 14043MC001007 REV A.
Matrix control uses the 6870C-0480A Timing Controller (T-CON).
To power the backlight LEDs, the TNPA5935 LED driver is used, controlled by the BD9486F-GE2 PWM controller (C0ZBZ0002179). The keys of the B1CERM000055 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-42ASR600 TV is carried out by the TNPA5916 power module, or its analogs using C0DBBYY00058, C0DBAYY01329 microcircuits and power switches of the B1CFRR000028, B1CERR000096 type.
MainBoard - the main board (motherboard) is a TNP4G568 module, using CPU chips: PEAKS-sLD8A, LNBH29PT (PWM) and others.
The TDSA-G320D tuner provides reception of television programs and tuning to channels.
TV PANASONIC TX-42ASR600 with LCD V420FWSD09, 42 "(107 cm) diagonal in 16: 9 format. The LCD panel of the TV is equipped with direct backlighting with rear LEDs - Direct LED.
The V420FWSD09 panel and the TNP4G568 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics.
The TX-42ASR600 is equipped with SMART software, built-in applications and the ability to work on the Internet. The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and formation of a digital signal picture occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Multimedia file formats supported by the video processor: MP3, WMA, MPEG4, MKV, JPEG.
The power of the acoustic audio system is 20 W (2x10 W) provided by two speakers. NICAM STEREO sound processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, HDMI x2, USB, Ethernet (RJ-45). A headphone output is provided for individual listening. To connect a computer or laptop, a VGA (D-Sub 15) connector is used that supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The digital tuner is capable of receiving terrestrial and cable channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 963x610x247 mm, without stand 963x566x69 mm.
TV weight: with stand: 10.5 kg, without stand: 9 kg.
Attention! The panel V420FWSD09 14043MC001007 REV A of the PANASONIC TX-42ASR600 LED TV is its most expensive element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
