Technical description and composition of the LG 32LD555 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LD555 ZC
Chassis / Version: LD01B
Panel: LC320WUG (SC) (A1)
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F (24 pin)
Power Supply (PSU): EAX61124201 / 14 REV1.1
PWM Power: STR-W6053N, HS01G (PFC)
MainBoard: EAX61354204 (0) - EBR65979075
IC MainBoard: CPU: LGE107DC, FLASH NAND: H27U1G8F2BTR, DDR3 SDRAM: Audio amp: NTR-7100, 32K FLASH, Gamma: 9668E, Dc / Dc: 17113E, Eeprom: 24C16WR, SPI Flash: 25Q80
Tuner: TDTJ-S001D EBL60721201
Control: IR: TABS16101A
Specifications 32LD555
LG 32LD555
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the LG 32LD555 TV, as well as the external elements of the housing. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
A malfunction of the power supply is often manifested corny - the TV does not turn on, does not make any sounds, does not light up and does not blink with any indicators. 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 transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip IC STR-W6053N, HS01G (PFC) may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
In cases where the LG 32LD555 TV has lost its image, and the sound is there and all the other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
If the EAX61354204 (0) - EBR65979075 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. In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: LGE107DC, FLASH NAND: H27U1G8F2BTR, DDR3 SDRAM: H5T01G63BFR, Audio amp: NTR-7100, 32K FLASH, Gamma: 9668E, Dc / Dc: 17113E, Eeprom: 24C16WR, SPI Flash: 25Q80BVCIG which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If the TV works normally from external devices, but does not tune into television channels, the TDTJ-S001D EBL60721201 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention to the owners! Attempts at self-repair of the LG 32LD555 TV are not recommended by the manufacturer and can lead to serious negative consequences!
PSU SCHEMATIC ------------------------> LGP42-10LF EAX61124201 EAY60869402 Power supply
The appearance of the MainBoard EAX61354204 is shown in the figure below:EAX61354204
EAX61354204 can be used in TVs:
LG 32LD345 (Panel LC320WXE-SCA1), LG 37LD450 (Panel LC370WUG (SC)(A1)), LG 42LD455-ZA (Panel LC420WUG), LG 32LD550 (Panel LK315D3LA57), LG 42LD450 ZA (Panel LC420WUG (SC)(A1)), LG LG32LD350 32LD350 (Panel T315HW04 V.8), LG 42LD420 ZA (Panel LC420WUG (SC)(A1)), LG 37LD420 ZA (Panel T370HW03 V.B), LG 32LD420 ZA (Panel LC320WUG (SC)(A1)), LG 32LD555 ZC (Panel LC320WUG (SC)(A1)), LG 26LD355-ZA (Panel T260XW04 V.3), LG 37LD425 ZA (Panel T370HW03 V.B), LG 32LD425 (Panel LC320WUG (SC)(A1)), LG 32LD340 32LD340-ZA.BRUWLJU (Panel LC320WXE (SC)(A1)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX61124201 / 14 REV1.1 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the HS01G 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 32LD555:
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 32LD555 TV are generated by the EAX61124201 power module, or its analogs using STR-W6053N, HS01G (PFC) microcircuits.
MainBoard - the main board (motherboard) is an EAX61354204 module, using CPU chips: LGE107DC, FLASH NAND: H27U1G8F2BTR, DDR3 SDRAM: H5T01G63BFR, Audio amp: NTR-7100, 32K FLASH, Gamma: 9668E, Dc3E11, Dc / Dc: 17 Eeprom: 24C16WR, SPI Flash: 25Q80BVCIG and others.
The TDTJ-S001D EBL60721201 tuner provides TV reception and channel tuning.
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)
