Technical description and composition of the LG 32LG7000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LG7000
Chassis / Version: LD88D
Panel: LC320WUN SA B3
T-CON: 6632L-0518B (KUBNKM154B REV1.1 ALPS)
Inverter (backlight): 6632L-0518B (KUBNKM154B REV1.1 ALPS)
PWM Inverter: BD9897FS
Power Supply (PSU): EAY4050440 LGP32-08H
PWM Power: 1207A, SG6961SZ (PFC), NCP1396
MainBoard: EAX50527202 (2)
IC MainBoard: CPU: FLI10620H-AA, Nand: HY27US08121B-TPCB, DDR: HYB18TC512160B2F, MSP44598 C4; TDFV-G135D; 24C512
Tuner: TDFV-G135D1
Control: IR: EAX43438901
Specifications 52LG5030
LG 32LG7000
General recommendations for repairing TV LCD
LG TV made on the LD88D chassis, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
In cases where the LG 32LG7000 TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the LGP32-08H power supply module is most likely faulty or missing processor power on the motherboard (a typical defect of some LG TVs). 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.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
Sometimes the LG 32LG7000 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit). It is necessary to take into account that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
The motherboard EAX50527202 (2) must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MSP44598 C4; TDFV-G135D; 24C512. BGA chip malfunctions are usually easy to detect by warming up.
Remember! Attempts to self-repair by users of the LG 32LG7000 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC MANUAL ----------------> LG CHASSIS : LD88D MODEL: 32LG7000, 32LG7000-ZA SERVICE MANUAL.
PSU SCHEMATIC -----------------------> LGP32-08H
The appearance of the MainBoard EAX50527202 is shown in the figure below:
EAX50527202
The appearance of the power supply
Main features of the device LG 32LG7000:
Installed matrix (LCD-panel) LC320WUN SA B3.
The matrix control uses the Timing Controller (T-CON) 6632L-0518B.
To power the backlight, an inverter 6632L-0518B is used, it is controlled by the BD9897FS PWM controller.
The necessary supply voltages for all nodes of the LG 32LG7000 TV are generated by the EAY4050440 power module, or its analogs using chips 1207A, SG6961SZ (PFC), NCP1396.
MainBoard - the main board (motherboard) is an EAX50527202 module using CPU chips: FLI10620H-AA, Nand: HY27US08121B-TPCB, DDR: HYB18TC512160B2F, MSP44598 C4; TDFV-G135D; 24C512 and others.
The TDFV-G135D1 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320WUN-SAB3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1300: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V