Technical description and composition of the PANASONIC TX-42CSR610 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-42CSR610
Chassis / Version: KM-26E
Panel: LC420DUJ (SG) (E3)
LED driver (backlight): TNPA5935 1 LD
PWM LED driver: C0ZBZ0002179
MOSFET LED driver: B1CERM000055
Power Supply (PSU): TNPA5916 1 P TNPA5916DJ
PWM Power: C0DBBYY00058, C0DBAYY01329
MOSFET Power: B1CFRR000028, B1CERR000096
MainBoard: TNP4G568 2 A R02A 568RB
IC MainBoard: CPU: PEAKS-sLD8A, LNBH29PT (PWM)
Tuner: TDSA-G320D
TX-42CSR610 Specifications
PANASONIC TX-42CSR610
General recommendations for TV LCD LED repair
Possible malfunctions
- The PANASONIC TX-42CSR610 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In some of these cases, the fault is detected in the TNPA5916 power supply module. It is then necessary to measure its output voltages and, if they are absent, the power switches (B1CFRR000028, B1CERR000096) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In the event of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers C0DBBYY00058, C0DBAYY01329, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
Usually, in such cases, a malfunction is detected in the LED panel backlight nodes. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source. Opening the panel, you can check each LED separately. Typically, Chinese multimeters will lightly light one 3-volt LED if you connect the probes to it in the forward direction. 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 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). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: PEAKS-sLD8A, LNBH29PT (PWM). Malfunctions in BGA chips are usually easy to detect by warm-up.
The malfunction of the TDSA-G320D tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
If the PANASONIC TX-42CSR610 has no picture, but there is sound, the LCD backlight LC420DUJ (SG) (E3) 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 LC420DUJ LCD panel, a process that requires experience and qualifications from the technician. 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.
Users and owners of TVs should remember that attempts to self-repair the PANASONIC TX-42CSR610 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-TX-42CSR610 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-42CSR610 device:
Installed matrix (LED panel) LC420DUJ (SG) (E3).
To power the backlight LEDs, the TNPA5935 LED driver is used, controlled by the C0ZBZ0002179 PWM controller. 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-42CSR610 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.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUJ-SGE3
Type: a-Si TFT-LCD, CELL
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 927.936x521.964 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 6.35% (with Polarizer)
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit)
Response Time: 6 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
TV PANASONIC TX-42CSR610 with LCD display LC420DUJ, diagonal size 42 "(107 cm) 16: 9 format. The technology of manufacturing the screen of this TV model is realized with LED backlighting.
The LC420DUJ panel and TNP4G568 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics.
The TX-42CSR610 is equipped with SMART software, built-in applications and Internet connectivity. Internet connection can be made via Wi-Fi wireless connection. 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. 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, SCART, HDMI x2, USB, Ethernet (RJ-45), Wi-Fi. 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.
Attention! The LC420DUJ (SG) (E3) panel of the PANASONIC TX-42CSR610 LED TV is the most expensive item.
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.