Technical description and composition of the LG 37LH2000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 37LH2000
Chassis / Version: LD91A
Panel: LC370WXE (SB) (A1)
T-CON: 6870C-0240C; LGDP4805A, OILEL-0011A, TPS65162
Inverter (backlight): integrated into PSU
PWM Inverter: BD9215F
Trans Inverter: LIH37-001 NYB-003
Power Supply (PSU): EAX55357701 / 34
PWM Power: ICE2PCS06 (PFC), STR-W6252
MOSFET Power: 07N60C3
MainBoard: EAX60686904 (2)
IC MainBoard: MP2212DN, 25X32VSIG, LCX244, MP2305DS, LVC541A, LGE3368A-LF-SF, MAX3232C, LM324DG, LGE2001S, 24C08WI, NTP-3100L
Tuner: TDFW-G235D
Control: AKB69680403
Specifications 37LH2000
LG 37LH2000
General recommendations for repairing TV LCD
Diagnostics of malfunctions and repairs of the LG 37LH2000, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Sometimes the LG 37LH2000 TV just doesn’t turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the EAX55357701 / 34 common power module. If it is working properly, you must check the standby batteries on the Main Board. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the filters of the secondary rectifiers (if any), you must first check the mains fuse. When it is broken, the power elements of the 07N60C3 transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the LG 37LH2000 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working. Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Repair or diagnostics of the EAX60686904 (2) motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements MP2212DN 25X32VSIG LCX244 MP2305DS LVC541A LGE3368A-LF-SF MAX3232C LM324DG LGE2001S 24C08WI NTP-3100L requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a TDFW-G235D tuner is suspected of a malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Attention! For users and owners of 37LH2000 TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device
schematic diagram -------------> LG CHASSIS : LD91A; MODEL: 37LH2000 37LH2000-ZA, 37LH2010, 37LH2010-ZB
The appearance of the MainBoard EAX60686904 is shown in the figure below:EAX60686904
EAX60686904 can be used in TVs:
LG 32LD320 (Panel T315XW03 V1), LG 32LD320-ZA (Panel T315XW03), LG 32LH4000-ZA (Panel LC320WUN), LG 32LH2000 (Panel LK315T3LA57), LG 32LH2010 (Panel LK315T3LA57), LG 32LF2510 ZB (Panel LC320WUN (SA)(B3)), LG 37LH2000 (Panel LC370WXE (SB)(A1)), LG 19LD320 ZA (Panel M185B1-L02 Rev.C3), LG 26LH2000 (Panel T260XW02 V.R), LG 32LG2100 (Panel LC320WXN), LG 22LH2000 ZA (Panel V216B1-L02), LG 42LH2000 ZA.ARUVLH (Panel LC420WXE (SB)(A1)), LG 32LD321 32LD321-ZB (Panel T315XW03 V1), LG 26LD320 (Panel T260XW04 V.3), LG 19LH2000 19LH2000-ZA (Panel M185B1-L03).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX55357701 / 34 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the ICE2PCS06 PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 37LH2000:
Installed matrix (LCD panel) LC370WXE (SB) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0240C ;.
To power the backlight, a converter is used, combined with a power supply, controlled by a BD9215F PWM controller. The transformer LIH37-001 NYB-003 is installed in the inverter converter.
The necessary supply voltages for all nodes of the LG 37LH2000 TV are generated by the EAX55357701 power supply module or its analogs using ICE2PCS06 (PFC), STR-W6252 microcircuits and 07N60C3 type power switches.
MainBoard - the main board (motherboard) is an EAX60686904 module using MP2212DN, 25X32VSIG, LCX244, MP2305DS, LVC541A, LGE3368A-LF-SF, MAX3232C, LM324DG, LGE2001S, 24C08WI, NTP-3100L and other chips.
The TDFW-G235D tuner provides TV reception and channel tuning.
Information from an alternative source:
LG 37LH2000-ZA Chassis LD91A MATRIX: LC370WXE (SB) (A1), MAIN: EAX60686904 (2), MP2212DN, 25X32VSIG, LCX244, MP2305DS, LVC541A, LGE3368A-LF-SF, MAX3232C, LM324DI00, LG324DI00, LG324DI00, LG324DG00, LG324D00, LG324D00, LG324D00, LG324D00, LG324DG00, LG324DL00, LGE4200, LTE , Tuner: TDFW-G235D
T-con: P / N 6870C-0240C, LGDP4805A, OILEL-0011A, TPS65162, PSU & INVERTOR: EAX55357701 / 34, 2PC506, 07N60C3 x2, BD9215F, STRW6252, TR-INVER LIH37-001 NYB-003
Remote control: AKB69680403
Additional technical information about the panel:
Brand: LG Display
Model: LC370WXE-SBA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs EEFL Embedded (Balance board)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V