Technical description and composition of the LG 32LV3700 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LV3700
Chassis / Version: LD12B
Panel: T315HW07 V.8
LED backlight: 73.31T14.004-0-SK1 110309
T-CON: T315HW07 V8; MAX16814, G1564
LED driver (backlight): 31T14-D04 T315HW07 V8
PWM LED driver: MAX16814, RM5103
MOSFET LED driver: P3506DD, P1825AS
Power Supply (PSU): EAX62865601 / 7 LGP3237-11SPC1
PWM Power: FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ
MainBoard: EAX63557704 (0)
IC MainBoard: Cpu: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024, 24C16
Tuner: TDFR-G136D
Control: AKB73275605, Magic Motion Control: AN-MR200
Specifications 32LV3700
LG 32LV3700
General repair guidelines for TV LCD LED
Repair of the LG 32LV3700 TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
If the 32LV3700 TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or power converter of the control processor may be malfunctioning, which is typical for some LG models. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the LG 32LV3700 does not have an image, but there is sound, there may be a malfunction of the T315HW07 backlight LEDs or their power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
Repair or diagnostics of the EAX63557704 (0) motherboard should begin by checking the stabilizers or power converters of its chips. If necessary, you should update the software (software).
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - Cpu: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024, 24C16 with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the power supply of the TDFR-G136D tuner.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC MANUAL -----------------------> LG CHASSIS: LD12B, 32LV3700 32LV3700-ZC, 32LV375G/S/W 32LV375G/S/W-ZC SERVICE MANUAL.
SCHEMATIC MANUAL -----------------------> EAX62865601 rev1 LGP3237-11SPC1 Power Supply schematic diagram
To reduce the backlight current in LED drivers with a PWM controller MAX16814 (TSSOP20 MAX16814B), it is necessary to proportionally increase the total resistance of the resistors from terminal 10 (SETI) to the housing. The maximum current in each of the four channels (in milliamps) for the resistance Rseti (in kilo-ohms) is determined from the ratio 1500 / Rseti.
More details on this page
The appearance of the MainBoard EAX63557704 is shown in the figure below:EAX63557704
EAX63557704 can be used in TVs:
LG 37LV370S (Panel T370HW05 V.1), LG 42LV370S (Panel LC420EUN (SD) (V5)), LG 32LV3700 (Panel T315HW07 V.8), LG 42LV3700 (Panel LC420EUN (SD) (V3)), LG 47LV370S ZB ( Panel LC470EUE (SD) (V1)), LG 32LV370S (Panel T315HW07 V.8).
The appearance of the power supply
Main features of the device LG 32LV3700:
Installed matrix (LED-panel) T315HW07 V.8.
The matrix control uses the Timing Controller (T-CON) T315HW07.
The LED driver 31T14-D04 is used to power the backlight LEDs, it is controlled by the PWM controller MAX16814, RM5103. As power elements of the LED driver, keys of the type P3506DD, P1825AS are used.
The necessary supply voltages for all nodes of the LG 32LV3700 TV are generated by the EAX62865601 power module, or its analogs using FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ microcircuits.
MainBoard - the main board (motherboard) is an EAX63557704 module, using Cpu chips: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024, 24C16 and others.
The TDFR-G136D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T315HW07 V8 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Contrast Ratio: 3500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
