Technical description and composition of the LG 32LH7000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LH7000
Chassis / Version: LD91D
Panel: LC320WUD (SB) (A1)
T-CON: 870C-0249B LC320WUD
Inverter (backlight): 6632L-0548A
Power Supply (PSU): PSLL-T804A EAY58473201 2300KPG083A-F
MainBoard: EAX55684502 (1) SAA34419903 94EBR010-0818 EBR61271801
IC MainBoard: CPU: LGE3369A, NAND Flash: HY27US08121B-TPCB, SPI Flash: MX25L3205DM2I, EEPROM: M24512
Tuner: EBR61310601 EAX58326902 (0)
Control: Remote: MKJ42519618, IR EAX57580702 (0) EBR61310805
Specifications 32LH7000
LG 32LH7000
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 32LH7000 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Typically, with such manifestations, the defect is caused by faulty elements in the PSLL-T804A main power module. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX55684502 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software).
The malfunction of the tuner EBR61310601 EAX58326902 (0) is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention! For users and owners of 32LH7000 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual and schematic diagram ------------------------> LG 32LH7000 Chassis LD91D
The appearance of the MainBoard EAX55684502 is shown in the figure below:EAX55684502
The appearance of the power supply
Main features of the device LG 32LH7000:
Installed matrix (LCD panel) LC320WUD (SB) (A1).
The matrix control uses the Timing Controller (T-CON) 870C-0249B.
An inverter 6632L-0548A is used to power the backlight.
The formation of the necessary supply voltages for all nodes of the LG 32LH7000 TV is carried out by the PSLL-T804A power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX55684502 module using CPU chips: LGE3369A, NAND Flash: HY27US08121B-TPCB, SPI Flash: MX25L3205DM2I, EEPROM: M24512 and others.
The tuner EBR61310601 EAX58326902 (0) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320WUD-SBA1
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); 8 (MPRT)
Frequency: 120Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V