Technical description and composition of the LG 32LW5700 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LW5700
Chassis / Version: LE13E
Panel: LC320EUD (SD) (P1)
LED backlight: 3660L-0373A 32 V6 Edge FHD R-Type / L-Type
T-CON: 6870C-0358A
LED driver (backlight): PCLC-D002 rev0.0 / 6917L-0045C 3PDGC20001J-R
Power Supply (PSU): EAX62865601 / 8 LGP3237-11SPC1_EAX62
PWM Power: FAN7930B, L6599AI, ICE3BR4765JZ
MOSFET Power: K10A60D
MainBoard: LE13E
IC MainBoard: LGE3558, NT5TU128M8DE_BD, TC58NVG2S3ETA0, MCU - LGE7303C, uPD78F0514, TDA19997, EAN60969603, NTP-7100
Tuner: HST-J222DHT
Appearance
LG 32LW5700
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 32LW5700 TV does not turn on at all. There is no reaction to the remote control and 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 EAX62865601 main power module. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of the power switches (K10A60D) and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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) FAN7930B, L6599AI, ICE3BR4765JZ, in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the LE13E 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). In cases of complex repairs of MB (SSB) and with the necessary skills and equipment, sometimes it may be necessary to replace its chips LGE3558, NT5TU128M8DE_BD, TC58NVG2S3ETA0, MCU - LGE7303C, uPD78F0514, TDA19997, EAN60969603, NTP-7100 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the HST-J222DHT tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
For 32LW5700 TV owners, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
SCHEMATIC MANUAL -----------------------> LG 32LW5700 Chassis LE13E
The appearance of the MainBoard LE13E is shown in the figure below:LE13E
The appearance of the power supply
Main features of the device LG 32LW5700:
Installed matrix (LED-panel) LC320EUD (SD) (P1).
The matrix control uses the Timing Controller (T-CON) 6870C-0358A.
The LED driver PCLC-D002 is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the LG 32LW5700 TV are generated by the EAX62865601 power supply module or its analogs using FAN7930B, L6599AI, ICE3BR4765JZ microcircuits and K10A60D type power switches.
MainBoard - the main board (motherboard) is a LE13E module, using the LGE3558, NT5TU128M8DE_BD, TC58NVG2S3ETA0, MCU - LGE7303C, uPD78F0514, TDA19997, EAN60969603, NTP-7100, and others microcircuits.
The HST-J222DHT tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUD-SEM1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 698.4x392.9 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 1.06B (8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V