Technical description and composition of the LG 32LG3000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LG3000
Chassis / Version: LD84A / LD84D
Panel: LK315T3LZ94 // LC320WXN (SB) (A3)
T-CON: LC260WX2-SLE1 (6870C-0145B); LGDP4801A, M12L16161A-5T, TPS65161
Inverter (backlight): I315B1-16A 6632L-0494A 2300KTG006A-F PNEL-T712A
PWM Inverter: OZ964SN, TPS65161
MOSFET Inverter: AO4614
Power Supply (PSU): EAY4050440 LGP32-08H // EAX40097902 / 0
PWM Power: SG6961SZ (PFC), NCP1396ADR2G, NCP1207ADR2G
MainBoard: EAX56818401 (0) (EBR48904604) // EAX40150702 (17)
IC MainBoard: CPU: LGE7363C-LF, RAM: HYB125DC256163CE-4, Flash Winbond 25x32VSIG, Audio: NTP-3000A
Tuner: TDFV-G135D
Control: MKJ40653802
Specifications 52LG5030
LG 32LG3000
General recommendations for repairing TV LCD
It is advisable to start repairing an LG TV with the LD84A chassis with a careful external inspection of both internal and external elements. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of 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 LG 32LG3000 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. In some cases, only the processor power regulator may be faulty. 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.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If the LG 32LG3000 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. When disabling the inverter protection (to enable diagnostics), special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
On the EBR48904605 motherboard, in case of a malfunction, you should first check the performance of all stabilizers or power converters of the microcircuits and, if necessary, update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - LGE7363C-LF, RAM: HYB125DC256163CE-4, Flash Winbond 25x32VSIG. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Once again, remind users! Attempts to self-repair the LG 32LG3000 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
schematic manual ----------------> LG CHASSIS: LD84A 32LG3000, 32LG3000-ZA SERVICE MANUAL.
schematic psu inverter -------> I315B1-16A I315B1-16A Inverter Schematic.
The appearance of the MainBoard EAX56818401 is shown in the figure below:EAX56818401
EAX56818401 can be used in TVs:
LG 26LG3050-ZA (Panel V260B1-L03), LG 32LG3000 (Panel LK315T3LZ94), LG 32LG3200 (Panel LC320WXN (SA)(A2)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAY4050440 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the SG6961SZ 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 32LG3000:
Installed matrix (LCD panel) LK315T3LZ94 or LC320WXN (SB) (A3).
The matrix control uses the Timing Controller (T-CON) LC260WX2-SLE1.
To power the backlight, an inverter I315B1-16A is used, it is controlled by the PWM controller OZ964SN, TPS65161. As power elements of the inverter, keys of the type AO4614 are used.
The necessary supply voltages for all nodes of the LG 32LG3000 TV are generated by the EAY4050440 power module, or its analogs using SG6961SZ (PFC), NCP1396ADR2G, NCP1207ADR2G microcircuits.
MainBoard - the main board (motherboard) is an EAX56818401 module, using CPU chips: LGE7363C-LF, RAM: HYB125DC256163CE-4, Flash Winbond 25x32VSIG, Audio: NTP-3000A and others.
The TDFV-G135D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SHARP
Model: LK315T3LZ94
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: ASV, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (2H)
Brightness: 450 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit)
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V