Technical description and composition of the LG 32LD650 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LD650
Chassis / Version: LJ03B
Panel: LC320WUG (SC) (A1)
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F (24 pin)
Power Supply (PSU): EAX61124201 / 15 Rev1.2 3PAGC10011A-R
PWM Power: STR-W6053N, HS01G (PFC)
MOSFET Power: 13NM60N, 2SK3868
MainBoard: EAX61531909 (2)
IC MainBoard: LGE3556C, SAA35116504, SAA35042638, ST24C16, 25X40BVSIG
Tuner: TDFR-G135D EBL60740401
Control: AKB72914208
Specifications 32LD650
LG 32LD650
General recommendations for repairing TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of operations for their dismantling. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In cases where the LG 32LD650 TV does not turn on at all, and also does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the EAX61124201 power supply module is most likely to be faulty or there is no standby power. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
A breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
If the LG 32LD650 has no 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 power supply are in good condition. If during troubleshooting, you need to disable the protection of the BD9270F inverter, there is a risk of failure of the power elements of the inverter, and special care is required. After completing all diagnostics and repair work, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
If the EAX61531909 motherboard is faulty, first of all it is necessary to check all the linear stabilizers and power converters of its chips, and also, if necessary, update the software (software). Sometimes you can check the health of MB only by replacement. Board repair and replacement of LGE3556C, SAA35116504, SAA35042638 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 TDFR-G135D tuner malfunction is established after checking the software, the presence of all supply voltages at its terminals and data exchange with the processor.
Attention to the owners! Attempts at self-repair of the LG 32LD650 TV are not recommended by the manufacturer and can lead to serious negative consequences!
Typical defects of LG TVs with LGE3556C processors are provoked by its severe temperature conditions and the quality of the LGE3556C processor itself.
External manifestations may be different - the tuner or external inputs do not work, or the TV does not turn on, for example, the control lamp blinks or hangs on the screen saver.
If, when the processor warms up, performance is restored, in such cases a reball can sometimes help. Then there is the opportunity to extend the life of the TV with the help of an additional heat sink or cooler. When replacing the processor, it should be borne in mind that they are discontinued and all LGE3556C, which sellers ALIexpress send, in most cases control units, are often already faulty.
SCHEMATIC MANUAL -----------------------> LG CHASSIS: LJ03B MODEL: 32LD650, 32LD650-SA.
SCHEMATIC PSU -----------------------------> LGP42-10LF EAX61124201 EAY60869402 Power supply
The appearance of the MainBoard EAX61531909 is shown in the figure below:EAX61531909
EAX61531909 can be used in TVs:
LG 32LD750 ZA (Panel LC320WUH (SC)(M1)), LG 32LD650 (Panel LC320WUG (SC)(A1)), LG 47LD750 ZA (Panel LC470WUH (SC)(M1)).
PSU Advanced
The 32LD650 TV is equipped with the EAX61124201 / 15 Rev1.2 3PAGC10011A-R power supply module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The step-up converter based on the HS01G PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current is determined by its reactance (of the order of 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the device LG 32LD650:
Installed matrix (LCD panel) LC320WUG (SC) (A1).
To power the backlight, a converter is used, combined with a power supply, controlled by a BD9270F PWM controller (24 pin).
The necessary supply voltages for all nodes of the LG 32LD650 TV are generated by the EAX61124201 power supply module or its analogs using STR-W6053N, HS01G (PFC) microcircuits and 13NM60N, 2SK3868 power switches.
MainBoard - the main board (motherboard) is an EAX61531909 module, using chips LGE3556C, SAA35116504, SAA35042638, ST24C16, 25X40BVSIG and others.
Tuner TDFR-G135D EBL60740401 provides the reception of television programs and tuning to channels.
Information from an alternative source:
LG 32LD650 Chassis LJ03B
Panel Type (Matrix): LC320WUG (SC) (A1)
Motherboard: EAX61531909 (2), Tuner: TDFR-G135D EBL60740401
PSU: P / N: 3PAGC10011A-R EAX61124201 / 15 Rev1.2
Remote control: AKB72914208
Additional technical information about the panel:
Brand: LG Display
Model: LC320WUG-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 1.06B (8-bit + FRC), CIE1931 72%
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 14 pcs EEFL Without Driver
Signal Interface: Mini LVDS, 120 pins
Voltage: 3.3 / 16V (VCC / VDD)