Technical description and composition of the PANASONIC TX-LR42E6 TV, panel type and modules used. The composition of the modules.PANASONIC LED
Model: TX-LR42E6 TX-L42E6E
Chassis / Version: LA41
Panel: V420HJ1-LE6 Rev. C5
LED backlight: V420H1-LS6-TREM5
T-CON: V500HJ1-CE1
LED driver (backlight): L390H1-1EE L420H1-1EA-C112A
Power Supply (PSU): TNPA5806 2 P
PWM Power: FA5760N (C0DBAYY01329), FA5696N (C0DBBYY00058), LV5980MC (C0DBAYY01599)
MOSFET Power: STD7NM60
MainBoard: TNPH1041 1 A
IC MainBoard: MT5590CAHJ, K4B2G1646E-BQKO, H27U4G8F2DTR, AN34043A
Tuner: TDSA-G220D
Control: IR: TNPA5785 1K, WLAN: H8N-WLU5150 8017-01620P
TX-LR42E6 Specifications
PANASONIC TX-LR42E6
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- The PANASONIC TX-LR42E6 TV does not turn on and does not show any signs of operation at all. No response to the remote control and front panel control buttons.
In some cases, the TNPA5806 power supply module is faulty with similar manifestations. It is necessary to measure its output supply voltages, and in their absence, check the serviceability of the power switches (STD7NM60) of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) FA5760N, FA5696N, in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- 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.
As a rule, in such cases there is no display 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 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MT5590CAHJ, K4B2G1646E-BQKO, H27U4G8F2DTR with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
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-LR42E6 has no picture, but there is sound, often the V420HJ1-LE6 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 V420HJ1-LE6 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 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.
Attention to users! Self-repair of the PANASONIC TX-LR42E6 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-LR42E6 Chassis LA41
The 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-LR42E6 device:
Installed matrix (LED panel) V420HJ1-LE6 Rev. C5.
Matrix control uses the Timing Controller (T-CON) V500HJ1-CE1.
The LED driver L390H1-1EE is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR42E6 TV is carried out by the TNPA5806 power module, or its analogs using the FA5760N (C0DBAYY01329), FA5696N (C0DBBYY00058), LV5980MC (C0DBAYY01599) power switches and STD7NM60 power switches.
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: CHIMEI INNOLUX
Model: V420HJ1-LE6
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 9.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Display technologies: Panel type: LED LCD. Format: 16: 9. Filter. Scanning backlight 100 Hz BLB. Viewing angle: 176 degrees.
Image technologies: Supported media formats: AVI / MKV / WMV / MP4 / M4v / FLV / 3GPP / VRO / VOB / TS / PS, MP3 / AAC / WMA Pro / FLAC / WAV, JPEG. Signal reception and processing standards: PAL -B / G / H, -I, -D / K: SECAM -B / G, -D / K, L / L ', DVB-T / T2 (MPEG4-AVC [H. 264]), DVB-C (MPEG4-AVC [H.264]).
Sound technologies: Ambient sound mode: V-Audio. Acoustic systems: Full Range x 2. Sound output power: 20 W (10 + 10). Audio Return Channel (Input 2).
Picture Modes: Dynamic, Normal, Cinematic, True Cinema, Custom
Input and output connectors (wired interface): SCART: 1 (back). Component Input: RCA phono type x 1 (rear). HDMI: 3 (3 behind). USB: ver. 2.0. Common Interface: 1. Digital audio output (optical) SD: 1 (rear). Headphone jack: 1 (side).
TV PANASONIC TX-LR42E6 with LCD V420HJ1-LE6, diagonal 42 "(107 cm) in 16: 9 format. The technology of manufacturing the screen of this TV model is realized with LED backlighting.
The V420HJ1-LE6 panel and the TNPH1041 motherboard firmware provide HD and Full HD viewing at 1920x1080 pixels in 1080p (Full HD) graphics.
The TX-LR42E6 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 44 watts.
Dimensions: with stand 957x619x217 mm, without stand 957x564x49 mm.
TV weight: with stand: 15 kg, without stand: 13.5 kg.
Attention! The panel V420HJ1-LE6 Rev. C5 of the PANASONIC TX-LR42E6 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.
