Technical description and composition of the LG 29LN450U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 29LN450U
Chassis / Version: 29MN33D / LD31S
Panel: V290BJ1-LE1 REV C1
LED backlight: V290B1-LE1-TLEM5
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: SMK630D
Power Supply (PSU): Adapter 19V
MainBoard: EAX64991305 (1.0)
IC MainBoard: CPU: LGE2121-MS; NAND Flash: SAA36381719; SPI Flash: 25Q80; EEPROM: ATML H316 2EC; SOUND: NTP7513;
Tuner: TDSQ-G601D (B) EBL61240503
Control: IR: EAX64661001 (1.4) AGF76500101
Specifications 29LN450U
LG 29LN450U
General repair guidelines for TV LCD LED
Repair of electronic devices, including the LG 29LN450U TV, it is advisable to start with an external examination of its external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the LG 29LN450U TV just does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the ADAPTER 19V common power supply module. If it is working properly, you must check the standby batteries on the Main Board. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
A breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
If when you turn on the LG 29LN450U there is no image, or it appears and immediately disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the V290BJ1-LE1 REV C1 panel, or in the power converter.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of 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.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - CPU: LGE2121-MS; NAND Flash: SAA36381719; SPI Flash: 25Q80; EEPROM: ATML H316 2EC; SOUND: NTP7513; which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
In the absence of tuning to local television channels, you should make sure that the software is correct, as well as the presence of supply voltages at the terminals of the TDSQ-G601D (B) EBL61240503 tuner.
It should be remembered! Attempts to repair the LG 29LN450U TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC MANUAL ---------------------> LG CHASSIS LA31R / LD31S MODEL: 29LN45**, 29LN45**-Z*.
To reduce the backlight current in LED drivers with the DT1641AS controller (DT1641S), you can increase the total resistance of the resistors from pin 7 (RISET) to the chassis. The exact proportional dependence may not be observed if there is additional control on this input, then the ratings should be selected empirically.
More details on this page
The appearance of the MainBoard EAX64991305 is shown in the figure below:EAX64991305
EAX64991305 can be used on TVs:
LG 29LN450U (Panel V290BJ1-LE1 REV C1), LG 29LN457U (Panel V290BJ1-LE1).
Main features of the device LG 29LN450U:
Installed matrix (LED-panel) V290BJ1-LE1 REV C1.
To power the backlight LEDs, a converter is used, combined with the EAX64991305 main board, controlled by the DT1641AS PWM controller. As power elements of the LED driver, keys of the SMK630D type are used.
To power all the internal components of the LG 29LN450U TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX64991305 module, using CPU chips: LGE2121-MS; NAND Flash: SAA36381719; SPI Flash: 25Q80; EEPROM: ATML H316 2EC; SOUND: NTP7513; and others.
Tuner TDSQ-G601D (B) EBL61240503 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V290BJ1-LE1
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 3.5%)
Brightness: 300 cd / m²
Contrast Ratio: 3000: 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 (1 ch, 8-bit), 30 pins
Voltage: 12.0V
