Technical description and composition of the PANASONIC TX-LR32E6 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-LR32E6
Chassis / Version: LA41
Panel: LC320EUN (FF) (M1)
LED backlight: 6922L-0054A 32 V13 ART3 Edge REV0.2 1 6920L-0001C
T-CON: 6870C-0438A
LED driver (backlight): 6971L-0144A KLS-E320SNAHF06 A
PWM LED driver: BD9470EFV
MOSFET LED driver: FDD850N10L
Power Supply (PSU): TNPA5852 2P
PWM Power: BM1P102FJ-E2
MainBoard: TNPH1041 1 A
IC MainBoard: MT5590CAHJ, K4B2G1646E-BQKO, H27U4G8F2DTR, AN34043A
Tuner: TDSA-G220D
Control: IR: TNPA5785
TX-LR32E6 Specifications
PANASONIC TX-LR32E6
General recommendations for TV LCD LED repair
Possible manifestations of defects
- PANASONIC TX-LR32E6 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.
Usually, with such manifestations, the defect is caused by faulty elements in the main TNPA5852 power supply module. Its output voltages should be measured and, in their absence, the serviceability of the power switches and rectifier diodes in the converters should be checked for possible breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in short-circuit mode, and in case of short-circuit in the elements of the primary circuit, the mains fuse usually breaks 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 regulator, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) BM1P102FJ-E2 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.
In some of these cases, the malfunction is caused by the lack of display backlighting. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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 when the probes are connected 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 pierced in the K / Z.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the TNPH1041 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - MT5590CAHJ, K4B2G1646E-BQKO, H27U4G8F2DTR, AN34043A. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
Before changing the TDSA-G220D tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of data exchange between the tuner and the processor can be monitored with an oscilloscope
If the PANASONIC TX-LR32E6 has no picture, but there is sound, often the LCD backlight LC320EUN (FF) (M1) 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 LC320EUN 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 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 TNPH1041 also turns out to be faulty, a software failure is also possible.
Then, first of all, you need 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 TNPH1041 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 loops and panel strips.
Owners of the TX-LR32E6 TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-LR32E6 Chassis LA41 for model TX-LR32E6
To reduce the backlight current in LED drivers with a BD9470EFV controller (TSSOP-B28), you should proportionally increase the total resistance of the resistors from pin 8 (ISET) to the case. Resistance Rset (in kilo-ohms) is selected from the ratio 3000 / Iled, where Iled is the maximum current in each of the six channels in milliamperes.
Additional MainBoard RepairThe appearance of the MainBoard TNPH1041 is shown in the figure below:
TNPH1041
External view of the power supply
The main features of the PANASONIC TX-LR32E6 device:
Installed matrix (LED panel) LC320EUN (FF) (M1).
Matrix control uses the Timing Controller (T-CON) 6870C-0438A.
The LED driver 6971L-0144A is used to power the backlight LEDs, it is controlled by the PWM controller BD9470EFV. The keys of the FDD850N10L type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR32E6 TV is carried out by the TNPA5852 power module, or its analogs using BM1P102FJ-E2 microcircuits.
MainBoard - the main board (motherboard) is a TNPH1041 module using MT5590CAHJ, K4B2G1646E-BQKO, H27U4G8F2DTR, AN34043A and others.
The TDSA-G220D tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUN-FFM1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.9 mm
Lamp Type: WLED
TV PANASONIC TX-LR32E6 with LCD LC320EUN, diagonal size 32 "(81 cm) 16: 9 format. The technology of production of the screen of this TV model is realized with LED backlighting.
The LC320EUN panel and TNPH1041 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics.
The TX-LR32E6 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. 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.
An external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, HDMI x3, USB x2, 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, supporting resolutions: 1920x1080.
The digital tuner is capable of receiving terrestrial and cable channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in operating mode from the network is 80 watts.
Dimensions: with stand 724x489x207 mm, without stand 724x434x53 mm.
TV weight: with stand: 9.5 kg, without stand: 8.5 kg.
Attention! The LC320EUN (FF) (M1) panel of the PANASONIC TX-LR32E6 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!
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.
