Technical description and composition of the LG 37LH5000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 37LH5000
Chassis / Version: LD91B
Panel: LC370WUD (SB) (M1)
T-CON: 6870C-0264B - 6871L-1588A - LC370WUD
Inverter (backlight): 6632L-0549A - 2300KTG017A-F - PNEL-T808A REV-0.8
PWM Inverter: BD9215AFV
MOSFET Inverter: FD8447L
Trans Inverter: L1-EF37-A-09817E-UN
Power Supply (PSU): EAX55177801 / 7 - REV 1.1 - LGP37-09P
PWM Power: ICE3B0365J (Standby)
MainBoard: EAX57644502 (5) - EBU60674844
IC MainBoard: LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L
Tuner: TDFW-G235D
Specifications 37LH5000
LG 37LH5000
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 37LH5000 TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the EAX55177801 main power module. Then it is necessary to measure its secondary (output) voltages and, if they are absent, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In the event of breakdowns in the secondary circuits, the converter may emergencyly operate in the short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM ICE3B0365J (Standby) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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 EAX57644502 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). Board repair and replacement of LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
The TDFW-G235D tuner malfunction is established after checking the software and all 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 to users! Self-repair of the LG 37LH5000 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
schematic diagram -------------> LG 37LH5000 Chassis LD91B.
CHASSIS : LD91B; MODEL : 37H5000, 37LH5000-ZB, 37H5010, 37LH5010-ZD, 37H5020, 37LH5020-ZE
The appearance of the MainBoard EAX57644502 is shown in the figure below:EAX57644502
EAX57644502 can be used in TVs:
LG 37LH5000 (Panel LC370WUD (SB) (M1)), LG 47LH5000 ZB (Panel LC470WUF (SB) (M1)), LG 42LH5000 42LH5000-ZB.BRUVLJU (Panel LC420WUF (SB) (M1)).
The appearance of the power supply
Main features of the device LG 37LH5000:
Installed matrix (LCD panel) LC370WUD (SB) (M1).
The matrix control uses the Timing Controller (T-CON) 6870C-0264B.
To power the backlight, an inverter 6632L-0549A is used, it is controlled by the BD9215AFV PWM controller. The transformer L1-EF37-A-09817E-UN is installed in the inverter converter. As power elements of the inverter, keys of the FD8447L type are used.
The necessary supply voltages for all nodes of the LG 37LH5000 TV are generated by the EAX55177801 power module, or its analogs using ICE3B0365J (Standby) microcircuits.
MainBoard - the main board (motherboard) is an EAX57644502 module, using chips LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L and others.
The TDFW-G235D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC370WUD-SBM1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Brightness: 500 cd / m²
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 120Hz + 120Hz