Technical description and composition of the PANASONIC TX-40ESR500 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-40ESR500
Chassis / Version: LA75
Panel: V400HJ9-MD1
LED backlight: IC-D-HWBJ40D660 - LED 6V
T-CON: 6B01M001JC00R, 6B01M001JB00R
LED driver (backlight): integrated into PSU
PWM LED driver: BD9289F-HVGE2
MOSFET LED driver: B1CFRL000042
Power Supply (PSU): TNPA6247 1 P TNPA6247DG
PWM Power: NCP1234AD
MOSFET Power: TK8A65D (B1CERR000067)
MainBoard: TNPH1181
IC MainBoard: CPU: MT5581P, AUDIO: YDA176
Tuner: C1AB00004164 DVB-T / T2 / C
Control: IR: TNPA6056, Wi-Fi: DNUA-P75B
TX-40ESR500 Specifications
PANASONIC TX-40ESR500
General recommendations for TV LCD LED repair
Possible malfunctions
- The PANASONIC TX-40ESR500 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Usually, with similar manifestations, the defect is caused by faulty elements in the main TNPA6247 power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (TK8A65D (B1CERR000067)) and rectifier diodes for possible partial or complete breakdown.
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 is most often broken.
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) NCP1234AD are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and all other functions work. Sometimes when you turn it on, the image appears and disappears for a second.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. The reason may be in the breakage of the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings connectors,
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TNPH1181 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - CPU: MT5581P, AUDIO: YDA176. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If the PANASONIC TX-40ESR500 has no picture, but there is sound, often the V400HJ9-MD1 display backlight 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 V400HJ9-MD1 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 the main board MainBoard TNPH1181 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 the normal range, it is necessary to trace the passage of LVDS signals from the MainBoard TNPH1181 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.
If the TV works normally from external devices, but does not tune to TV channels, the C1AB00004164 DVB-T / T2 / C 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 to users! Self-repair of the PANASONIC TX-40ESR500 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-40ESR500 Chassis LA75
The MainBoard TNPH1181 is shown in the figure below:TNPH1181
External view of the power supply
The main features of the PANASONIC TX-40ESR500 device:
Installed matrix (LED panel) V400HJ9-MD1.
Matrix control uses Timing Controller (T-CON) 6B01M001JC00R.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by a BD9289F-HVGE2 PWM controller. The keys of the B1CFRL000042 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-40ESR500 TV is carried out by the TNPA6247 power module, or its analogs using NCP1234AD microcircuits and TK8A65D power switches (B1CERR000067).
MainBoard - the main board (motherboard) is a TNPH1181 module, using CPU chips: MT5581P, AUDIO: YDA176 and others.
Tuner C1AB00004164 DVB-T / T2 / C provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: INNOLUX
Model: V400HJ9-MD1
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 878.112x485.352 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 9.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
TV PANASONIC TX-40ESR500 with LCD V400HJ9-MD1, diagonal size 39.5 "(100 cm) 16: 9 format. The technology of manufacturing the screen of this TV model is realized with LED backlighting.
The V400HJ9-MD1 panel and TNPH1181 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics.
The TX-40ESR500 TV is equipped with SMART software, built-in applications and the ability to work on the Internet. 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.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi. 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.
Dimensions: with stand 902x569x239 mm, without stand 902x521x88 mm.
TV weight: with stand: 8.5 kg, without stand: 8 kg.
Attention! The V400HJ9-MD1 panel of the PANASONIC TX-40ESR500 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!
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.