Technical description and composition of the LG 37LE4500 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 37LE4500 37LE4500-ZA
Chassis / Version: LD01D
Panel: T370HW04 V.4
T-CON: T370HW04 V4
LED driver (backlight): 37T06-D04
PWM LED driver: HV9982
MOSFET LED driver: 18N20GS
Power Supply (PSU): LGP3237-10Y
PWM Power: VIPER27L (Standby), SG6961, L6599
MOSFET Power: 04N60C3, 13NM60N
MainBoard: EAX61766102 (0)
IC MainBoard: CPU: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024
Tuner: TDTJ-S001D EBL60721201
Specifications 37LE4500
LG 37LE4500
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 37LE4500 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
In some of these cases, a malfunction is detected in the LGP3237-10Y power supply module. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches (04N60C3, 13NM60N) and rectifier diodes of converters for possible short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) VIPER27L (Standby), SG6961, L6599, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- 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 EAX61766102 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). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024. Defective components should be replaced.
Malfunction of the TDTJ-S001D EBL60721201 tuner 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.
TV users and owners need to remember that attempts to self-repair a LG 37LE4500 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE SPI FLASH ---> LG 37LE4500 37LE4500-ZA LD01D, Main: EAX61766102 (0), Panel: T370HW04 V.4
The appearance of the MainBoard EAX61766102 is shown in the figure below:EAX61766102
EAX61766102 can be used in TVs:
LG 42LE4500 ZA (Panel LC420EUG), LG 42LE4508 ZA (Panel T420HW07 V.5), LG 37LE5300 (Panel LC370EUH (SC)(A1)), LG 32LE4500 ZA (Panel T315HW05 V.3), LG 32LE5300 ZA (Panel T315HW05 V.1), LG 32LE3300 32LE3300-ZA.BRUWLJU (Panel LC320EXN (SC)(A1)), LG 37LE4500 37LE4500-ZA (Panel T370HW04 V.4 ), LG 32LE5450 -ZA (Panel LC320EUH (SC)(A1)).
The appearance of the power supply
Main features of the device LG 37LE4500:
Installed matrix (LED-panel) T370HW04 V.4.
The matrix control uses the Timing Controller (T-CON) T370HW04.
To power the backlight LEDs, the 37T06-D04 LED driver is used, controlled by the HV9982 PWM controller. As power elements of the LED driver, keys of the 18N20GS type are used.
The necessary supply voltages for all nodes of the LG 37LE4500 TV are generated by the LGP3237-10Y power module or its analogs using VIPER27L (Standby), SG6961, L6599 microchips and power switches of the 04N60C3, 13NM60N type.
MainBoard - the main board (motherboard) is an EAX61766102 module using CPU chips: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024 and others.
The TDTJ-S001D EBL60721201 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T370HW04 V4
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V