Technical description and composition of the LG 29MT45V TV, panel type and modules used. The composition of the modules.
LG LED
Model: 29MT45V 29MT45V-PZ
Chassis / Version: MT55 / LD41A
Panel: V290BJ1-LE2
LED backlight: V290B1-LE2-TLEM4 6202B0005U000
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: SMK630D
Power Supply (PSU): Adapter 19V 2.4A
MainBoard: EAX65377507 EBR 78952101
IC MainBoard: LGE2134, AT24C256C, MX25L8006E, H27U1G8F2CTR-BC, BA7657F, TAS5733
Tuner: TDJM-G101D
Specifications 29MT45V
LG 29MT45V
General recommendations for TV LCD LED repair
Possible manifestations of defects
- LG 29MT45V does not turn on, indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, the malfunction is most likely found in the adapter power module.
The TV is equipped with an external adapter 19V 2.4A power supply. TV owners can check by replacing them and purchase them on their own in stores, but the ability to open and eliminate typical defects usually does not create difficulties for the master. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
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 is usually cut 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) are usually checked by replacing them with new ones, or knowingly working.
- There is no image, the screen is black, there is sound, sometimes you can see barely noticeable outlines of the image in the ambient light of the screen.
In such cases, a malfunction of the LED panel backlighting elements is most likely. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or open circuit), sometimes in the violation of the contact connections of the LED strips V290B1-LE2-TLEM4 6202B0005U000.
It is impossible to detect an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). 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 EAX65377507 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 cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its chips LGE2134, AT24C256C, MX25L8006E, H27U1G8F2CTR-BC, BA7657F, TAS5733 and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
Before changing the tuner TDJM-G101D, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner 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 LG 29MT45V has no picture, but there is sound, the backlight of the V290BJ1-LE2 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 V290BJ1-LE2 LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to TV owners 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 the main board MainBoard EAX65377507 often 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 EAX65377507 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.
Once again, I remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repairs to professionals with sufficient experience in the field of electronic repair.
Driver current limitation after backlight repair. DT1641AS. Information from the master.
Decrease the backlight current from 166mA to 106mA - replaced the R1024 3 kOhm resistor by 22 kOhm at the RISET DT1641AS control input (7 pin).
Driver current limitation. DT1641. General recommendations
To reduce the backlight current in LED drivers with a DT1641AS (DT1641S) controller, you can increase the total resistance of the resistors from pin 7 (RISET) to the case. The exact proportional dependence may not be observed in the presence of additional control on this input, then the ratings should be selected empirically.
DOWNLOAD SCHEMATIC DIAGRAM ------------------> DT1641
Read more on the page: ------------------------------> backlight repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> CHASSIS LD41A FOR MODELS: 29MT45V 29MT45V-PDR.
The appearance of the MainBoard EAX65377507 is shown in the figure below:
EAX65377507
EAX65377507 can be used in TVs:
LG 28LB450U ZB (Panel 328041563 Kenmos), LG 24LB450U ZB (Panel V236BJ1-LE2 REV.C1), LG 24MT45V LG 24MT45V-PZ (Panel V236BJ1-LE2 Rev.C1), LG 24LB457U (Panel V236BJ1-LE2 Rev.C1), LG 22MT55V 22MT55V-PZ (Panel LM215WF3 (SL)(K1)), LG 22LB450U (Panel 1366x768 HD).
Main features of the LG 29MT45V device:
The matrix (LED-panel) V290BJ1-LE2 is installed.
To power the backlight LEDs, a converter combined with the main board EAX65377507 is used, controlled by the DT1641AS PWM controller. The keys of the SMK630D type are used as power elements of the LED driver.
To power all internal components of the LG 29MT45V TV, an external adapter 19V 2.4A is used.
MainBoard - the main board (motherboard) is an EAX65377507 module using chips LGE2134, AT24C256C, MX25L8006E, H27U1G8F2CTR-BC, BA7657F, TAS5733 and others.
Tuner TDJM-G101D provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V290BJ1-LE2
Type: a-Si TFT-LCD, Panel
Diagonal size: 29.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 631.092x354.816 mm
Surface: Antiglare (Haze 1%)
Brightness: 300 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Instructions and updates
There are files to download for model LG 29MT45V from the manufacturer:
Files with updates and instructions:
File Description File Name Type Date Size
Software release (Version 03.09.04). Firmware (USB) Software_File (Version_03.09.04) .zip ZIP 12.12.2016 57624K
Software release (Version 03.09.04). Update instructions TV_Software_Update_Guide_v3.pdf PDF 12.12.2016 1938K
Compatible with 22MT45V-PZR, 22MT45V-WZR, 22MT55V-PZR, 23MT55V-PZR, 23MT75V-PZR, 24MT45V-PZR, 24MT45V-WZR, 24MT55V-PZR, 29MT45V-PZR.
L14 Software release (Version 03.09.02). Firmware (USB) MTV_M1A_DVB_EU_MP_RevNo6425_V03.09.02_usb_V2_SECURED.zip ZIP 28.06.2016 57622K
User Manuals and Instructions:
File type File name Language Date Size
User manual MFL68066401_1403_01REV.pdf English 03/05/2014 20,641K
Quick Start Guide L14_M_EU_39.zip English, Estonian, Latvian, Lettish, Lithuanian, Russian 05/06/2015 2,818K
Files can be downloaded from the manufacturer's website for model LG 29MT45V
LG 29MT45V TV with V290BJ1-LE2 LCD, 29 "(74 cm) 16: 9 format diagonal. This model uses a panel with edge LED backlighting - Edge LED.
The V290BJ1-LE2 sensor and MainBoard EAX65377507 software provide high quality HD viewing at 1366x768 pixels and 720p (HD Ready). The input analog video signal is decoded in PAL, SECAM, NTSC systems. The graphic processing of the digital signal is carried out in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, MPEG4, DivX, JPEG.
Speaker power 10 W (2x5 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI, USB. A headphone jack is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is provided. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S2 standards.
The TV uses an external adapter 19V 2.4A.
Dimensions: With stand 623x476x213 mm, Without stand 623x378x80 mm.
Attention! Panel V290BJ1-LE2 LED-TV LG 29MT45V is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also 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.