Technical description and composition of the PANASONIC TX-32DR400 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-32DR400
Chassis / Version: KM25E
Panel: TZLP200KEAA3
LED backlight: F105M5P39F PN-EL-32-21 - V0
T-CON: 6870C-0442B
LED driver (backlight): integrated into PSU
PWM LED driver: BL0100A (C0ZBZ0002197)
MOSFET LED driver: B1CFRR000028
Power Supply (PSU): TNP4G572 1 P
PWM Power: NCP1234AD100R2G (C0DBBYY00065)
MOSFET Power: TK8A65D (B1CERR000067)
MainBoard: TNP4G566 A 1 R02A 566RQ
IC MainBoard: SPI FLASH: MX25L12835E, EEPROM: 24C64
Tuner: RE231TN
TX-32DR400 Specifications
PANASONIC TX-32DR400
General recommendations for TV LCD LED repair
Possible malfunctions
- The PANASONIC TX-32DR400 TV does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
With such manifestations, a malfunction is most likely found in the TNP4G572 power supply module. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of the power switches (TK8A65D (B1CERR000067)) and rectifier diodes for a possible breakdown (short circuit).
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key most often breaks off.
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) NCP1234AD100R2G (C0DBBYY00065), if they have no visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no picture, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. 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.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the TNP4G566 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). Often the MB (SSB) board needs to be replaced in the event of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SPI FLASH: MX25L12835E, EEPROM: 24C64 and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the RE231TN tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Attention to users! Self-repair of the PANASONIC TX-32DR400 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-32DR400 Chassis KM25E
MainBoard TNP4G566 is shown in the figure below:TNP4G566
External view of the power supply
Main features of the PANASONIC TX-32DR400 device:
Installed matrix (LED panel) TZLP200KEAA3.
Matrix control uses the Timing Controller (T-CON) 6870C-0442B.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by a BL0100A PWM controller (C0ZBZ0002197). The keys of the B1CFRR000028 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-32DR400 TV is carried out by the TNP4G572 power module, or its analogs using NCP1234AD100R2G (C0DBBYY00065) microcircuits and TK8A65D (B1CERR000067) power switches.
MainBoard - the main board (motherboard) is a TNP4G566 module, using SPI FLASH chips: MX25L12835E, EEPROM: 24C64 and others.
Tuner RE231TN provides reception of television programs and tuning to channels.
If the PANASONIC TX-32DR400 has no picture, but there is sound, the backlight of the TZLP200KEAA3 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 TZLP200KEAA3 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 the main board MainBoard TNP4G566 often 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 normal limits, it is necessary to trace the passage of LVDS signals from the MainBoard TNP4G566 with an oscilloscope, as well as synchronizing 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.
TV PANASONIC TX-32DR400 with LCD TZLP200KEAA3, diagonal size 32 "(81 cm) 16: 9 format. The technology of manufacturing the screen of this TV model is realized with LED backlighting.
The TZLP200KEAA3 panel and TNP4G566 board firmware can display HD images at 1366x768 pixels for 720p graphics resolution (HD Ready). 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, HDMI x2, USB. 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 standards.
Dimensions: with stand 734x477x184 mm, without stand 734x437x69 mm.
TV weight: with stand: 6 kg, without stand: 5.5 kg.
Attention! The panel TZLP200KEAA3 of the PANASONIC TX-32DR400 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.