Technical description and composition of the LG 42LB629V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LB629V ZM
Chassis / Version: LC43B / LD43B / LB43T
Panel: LC420DUE (FG) (P2)
LED backlight: LG lnnotek DRT 3.0 42_A type / 42_B type Rev01
T-CON: T-CON: V14 42 DDR 60HZ Control_ver 0.3 P / N: 6870C-0480A TL2375EP SW5084A
LED driver (backlight): integrated into PSU; 208V 250mA
PWM LED driver: BD9486F, NR134S
MOSFET LED driver: 6N14586
Power Supply (PSU): EAX65423701 (2.1) rev2.1
PWM Power: MAP8800 (PFC), FA6A01N (PWM resonant)
MOSFET Power: MBRF20100CTP MBRF10U100CTA 60R360P 60R580P MDD3752 x2 10N60M2 x2 MDHT4N20Y
MainBoard: EAX65388006 (1.0)
IC MainBoard: LGE2131, A7MKN51C, H27U1G8F2CTR, 25L8006E, H5TQ1G63EFR, TAS5733, LCX244, A8303, 4580M-E1, TPS65282
Tuner: TDJM-G101D EBL61400501
Control: AKB73715694
Specifications 42LB629V
LG 42LB629V
General repair guidelines for TV LCD LED
LG 42LB629V ZM, like other televisions, it is advisable to start repairing from inspection of external and internal elements and modules. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and possible consequences, for example, from ring cracks in the soldered terminals of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external signs of certain malfunctions.
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the MAP8800 PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when turned on, but there are other functions that work, there is a high probability of a malfunction of the LED driver (LC420DUE (FG) (P2) panel backlight LED power converter).
In case of breaks in the LED circuit, a complete disassembly of the panel is required, the LEDs are checked for an open circuit, as well as the reliability of the connections in the connectors and rations of the terminals.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
On the EAX65388006 (1.0) motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips LGE2131, A7MKN51C, H27U1G8F2CTR, 25L8006E, H5TQ1G63EFR, TAS5733, LCX244, A8303, 4580M-E1, TPS65282 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
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 TDJM-G101D EBL61400501 tuner.
Attention to users! Self-repair of the LG 42LB629V TV without the appropriate qualifications and experience can lead to its complete non-repairability!
schematic diagram ------------> CHASSIS: LD43B, LD44B MODEL: 42LB62** 42LB62**-Z**.
Backlight Current Limit:
In televisions with power supplies LGP3942-14PL1 (EAX65423701), the backlight current sensor - the resistor block R811-R818 consists of four pairs of 4.3 Ohm each. You can reduce the backlight current by 25% by removing one pair of resistors.
More details on this page
The appearance of the MainBoard EAX65388006 is shown in the figure below:EAX65388006
EAX65388006 can be used in TVs:
LG 32LB561V (Panel LC320DUE), LG 32LB561U (Panel NC320DXN VSBP1), LG 42LB629V ZM (Panel LC420DUE (FG)(P2) ), LG 32LB563U (Panel NC320DXN VSBP1), LG 42LB552V ZA (Panel LC420DUE (FG)(A6)), LG 32LB552U (Panel NC320DXN-VSBP4), LG 32LB563V (Panel LC320DUE (FG)(A3)), LG 42LB561V ZE (Panel LC420DUE (FG)(A3)), LG 42LB569V 42LB569V-ZX.BRUWLDU (Panel LC420DUE (FG)(A3)).
PSU Advanced
The EAX65423701 power supply module is made using a Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on the MAP8800 PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 42LB629V:
Installed matrix (LED-panel) LC420DUE (FG) (P2).
The matrix control uses the Timing Controller (T-CON) T-CON :.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the BD9486F, NR134S PWM controller. As power elements of the LED driver, keys of the 6N14586 type are used.
The necessary supply voltages for all nodes of the LG 42LB629V TV are generated by the EAX65423701 power supply module or its analogs using MAP8800 (PFC), FA6A01N (PWM resonant) microcircuits and power switches of the MBRF20100CTP MBRF10U100CTA 60R360P 60R580P MDD3752 x2 10N260N260N260N260 model.
MainBoard - the main board (motherboard) is an EAX65388006 module using LGE2131, A7MKN51C, H27U1G8F2CTR, 25L8006E, H5TQ1G63EFR, TAS5733, LCX244, A8303, 4580M-E1, TPS65282 and other chips.
Tuner TDJM-G101D EBL61400501 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUE-FGP2
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 927.94x521.96 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V