Technical description and composition of the LG 32LD550 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LD550
Chassis / Version: LD1B
Panel: LK315D3LA57
T-CON: RUNTK4323TP-ZM, Chip: D809900F1S11
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F (24 pin)
Power Supply (PSU): EAX61124201 / 14
PWM Power: STR-W6053N, HS01G (PFC)
MOSFET Power: 13NM60N, 2SK3868
MainBoard: EAX61354204
IC MainBoard: CPU: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I
Tuner: TDTJ-S001D
Specifications 32LD550
LG 32LD550
General recommendations for repairing TV LCD
Repair and diagnostics of any electronic device, in particular LG with the LD1B chassis, it is advisable to start with a careful external examination of internal and external elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
If the LG 32LD550 does not turn on, no control lights on the front panel are on or blinking, therefore, there is a very high probability of a malfunction of the EAX61124201 \ 14 power module. In some cases, only the processor power regulator may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the LG 32LD550 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU. It should be remembered that when the protection is turned off in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is necessary to restore all standard converter protection circuits.
If the EAX61354204 motherboard is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I. BGA chip malfunctions are usually easy to detect by warming up.
Attention to users! Self-repair of the LG 32LD550 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC MANUAL ----> LG CHASSIS: LD01B; 32LD550/558 32LD550/558-ZC, 32LD551/559 32LD551/559-ZA, 32LD550N 32LD550N-ZC SERVICE MANUAL.
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
The 32LD550 model uses the EAX61124201 / 14 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on the HS01G PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device LG 32LD550:
Installed matrix (LCD panel) LK315D3LA57.
The matrix control uses the Timing Controller (T-CON) RUNTK4323TP-ZM.
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 32LD550 TV are generated by the EAX61124201 power module or its analogs using STR-W6053N, HS01G (PFC) microcircuits and 13NM60N, 2SK3868 power switches.
MainBoard - the main board (motherboard) is an EAX61354204 module using CPU chips: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SHARP
Model: LK315D3LA57
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: ASV, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 430 cd / m²
Contrast Ratio: 4500: 1
Display Colors: 1.07B (8-bit + Hi-FRC)
Response Time: 5 (G to G)
Frequency: 120Hz
Lamp Type: 10 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V