Technical description and composition of LG 24LH480U TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 24LH480U
Smart TV 24LH480U | Year of manufacture: 2016
Screen diagonal: 24" (61 cm)
Screen format: 16:9
Resolution: 1366x768
Frequency refresh rate: 50Hz
LED backlight: yes, Edge LED
Smart: yes. Wi-Fi support: yes
Support HD: 720p HD
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Teletext: Yes
Multimedia: MP3, MPEG4, JPEG
Sound stereo: there is
Sound Power: 10W (2x5W)
Acoustics: two speakers
Interface: HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi
Dimensions: With stand 556x388x130mm
Without stand 556x345x53mm
Find out more...
LG 24LH480U
LG LED
Model: 24LH480U - PZ
Chassis/Version: LU52A
Panel: V236BJ1-LE2
LED backlight: 6202B0005S000
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: TO-252
Power Supply (PSU): 19v Adapter
MainBoard: EAX66586404 (1.0) . EBR82930403
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC/DC
MainBoard: TDJM-G301D
General advice about LCD LED TV repair
Possible flaws
- LG 24LH480U does not turn on or shows no signs of working at all. Does not blink on indicators and does not respond to control buttons.
In some of these cases the main switching power supply - the Adapter module - is defective.
The TV is equipped with an external 19v Adapter type power supply. Owners of the TV can check them by replacing them and buy them in stores, but the ability to open and fix typical defects usually does not create difficulties for the master. Then you should measure its output voltages and in case of their full or partial absence you should check the serviceability of the power switches and rectifier diodes of converters for possible short circuits.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can work in the emergency short-circuit mode without output voltages, and at short circuit in the elements of the primary circuit the mains fuse and more rarely the current sensor at the source of the key most often break down at once.
Mos-Fet power switches used in switched-mode power supplies sometimes fail due to the failure of some other element that can take it out of key mode, or cause the switch to exceed its maximum allowable parameters. These can be the elements that feed the PWM controller, the frequency-retaining or damping circuits, or the negative feedback elements in the stabilization circuit. PWM controllers, if there is no visible damage or outright short circuits between pins, are checked by replacing with new or known good ones.
If the LG 24LH480U has no picture but has sound, often the V236BJ1-LE2 display backlight is just not working. Moreover, in LED TVs usually fail the LEDs inside the panel, less often the LED-driver.
In such cases you can see faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD panel V236BJ1-LE2 - a process that requires a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair
If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is switched on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard EAX66586404 is defective, and software failure is also possible.
Then first it is necessary to check the panel supply voltage, 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 by oscilloscope the LVDS signals from MainBoard EAX66586404, as well as synchronizing signals to the driver stubs.
Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there was not significant damage in the cables and panel bars.
- No picture, sound is present and all other TV functions work. When turning on, the picture can sometimes appear for a second.
As a rule, in this case it turns out that the LED panel backlight is defective. Usually the cause of the fault is a breakage in the LEDs, or in the connectors of the LED strips, but sometimes the LED-driver is also faulty.
It should be remembered that to determine the breakage in the lines of LEDs without disassembling the panel, with a tester or multimeter is not possible without an additional device, such as a current source. To open all the PN-junctions connected in series at once a voltage of several tens of volts may be required. Then you have to open the panel and check each LED separately with a multimeter. If the possibilities of your multimeter do not allow to open the LED in the forward direction or twin LEd's are used, then the PN junction of the faulty stabilizer can indirectly serve as an indication of serviceability. If the LED is faulty, the PN junction of the stabilizer will either be open or shorted.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
- Front panel LED is blinking, TV set does not turn on, remote control is unresponsive.
Repair or diagnosis of the motherboard EAX66586404 should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. Sometimes elements of MainBoard - CPU, eMMC, DRAM, AUDIO, DC/DC need checking or replacement (if necessary). If a BGA processor is used, its failure is usually detected by local heating.
Before replacing the TDJM-G301D tuner if you cannot tune to the TV channels, make sure the supply voltages are present and measure at the respective pins of the tuner and check the software for correctness. The tuner-to-processor communication pulses can be checked with an oscilloscope
To the users and owners of TV sets it is necessary to remember that attempting to repair LG 24LH480U TV set itself without the relevant qualification and necessary experience, can lead to serious negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LG 24LH480U Chassis LU52A.
Refinement after the repair of the backlight. EAX66586404, DT1641AS. Information from the master.
Decreased backlight current from 180 mA to 120 mA - increased the rating of one of the resistors (R1025) from pin 7 of ISET chip DT1641AS from 24 to 43 kOhm on board EAX66586404.
More on MainBoard Repair
The MainBoard EAX66586404 is shown in the figure below:
EAX66586404.
Main features of the LG 24LH480U:
A matrix (LED panel) V236BJ1-LE2 is installed.
To power the LED backlight is used converter, combined with the main board EAX66586404, controlled by PWM controller DT1641AS. As the power elements of the LED-driver switches of TO-252 type are used.
To power all the internal components of LG 24LH480U TV set an external power supply of Adapter 19v type is used.
MainBoard - the main board (motherboard) is EAX66586404 module using CPU, eMMC, DRAM, AUDIO, DC/DC and other chips.
The TDJM-G301D tuner provides TV program reception and channel tuning.
More technical information about the panel:
Brand : CHIMEI INNOLUX
Model : V236BJ1-LE2
Type : A-Si TFT-LCD, Panel
Diagonal size : 23.6 inch
Resolution : 1366x768, WXGA
Display Mode : Super MVA, Normally Black, Transmissive
Active Area : 521.471x293.184 mm
Surface : Antiglare (Haze 1%), Hard coating (3H)
Brightness : 250 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
LG 24LH480U TV with V236BJ1-LE2 LCD display, measuring 24" (61 cm) diagonally in 16:9 aspect ratio. This model uses a panel with an end arrangement of LEDs in the display backlight - Edge LED.
V236BJ1-LE2 matrix and MainBoard software EAX66586404 provide high quality HD viewing at a resolution of 1366x768 pixels in 720p (HD Ready).
The 24LH480U features SMART software, built-in applications and Internet connectivity. You can connect to the network using Wi-Fi wireless connectivity. Supported media formats: MP3, MPEG4, JPEG.
The speaker system has a sound power of 10 W (2x5 W) provided by two speakers. It uses NICAM stereo sound processing and Sound Surround surround function.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi. The digital tuner is capable of receiving TV channels in the DVB-T, DVB-T2, DVB-C standards.
The TV uses an external power supply Adapter 19v.
Dimensions: C stand 556x388x130 mm, without stand 556x345x53 mm.
Warning. The V236BJ1-LE2 LED TV panel of LG 24LH480U is an expensive and unreliable part of the TV.
Avoid any kind of impact on the glass and pressure on the screen surface to avoid damaging the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.