Technical description and composition of the LG 32LG5700-ZF TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LG5700-ZF
Chassis / Version: LD84D
Panel: 32 inch
Inverter (backlight): 6632L-0518B
PWM Inverter: BD9897FS
Trans Inverter: L2-EF32-B-09302B-KI
Power Supply (PSU): EAY4050440 LGP32-08H
PWM Power: 1207A, SG6961SZ (PFC), NCP1396
MainBoard: LD84A / 84D LG5000 / 3000
IC MainBoard: 91A6R7TG4 TMDS351 NTP-3000A LGE7863C-LF
Tuner: TDFV-G135D
Control: IR: EAX43438801
Specifications 52LG5030
LG 32LG5700-ZF
General recommendations for repairing TV LCD
It is advisable to start repairing an LG TV with the LD84A / 84D chassis with a careful external inspection of both 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. 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.
Failures of the LGP32-08H power supply module can be expressed in different ways, for example, LG 32LG5700-ZF does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) 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 main 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.
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 the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If the LG 32LG5700-ZF does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors. All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
If the motherboard LD84A / 84D LG5000 / 3000 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. Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements 91A6R7TG4 TMDS351 NTP-3000A LGE7863C-LF tuner TDFV-G135D requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
Owners and users of the LG 32LG5700-ZF TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC MANUAL --------------------------------> LG 32LG5700, 32LG5700-ZF Chassis LD84D.
PSU SCHEMATIC ---------------------------------------> LGP32-08H
The appearance of the power supplyMain features of the device LG 32LG5700-ZF:
Installed matrix (LCD-panel) 32 inches.
To power the backlight, an inverter 6632L-0518B is used, it is controlled by the BD9897FS PWM controller. A transformer L2-EF32-B-09302B-KI is installed in the inverter converter.
The necessary supply voltages for all nodes of the LG 32LG5700-ZF TV are generated by the EAY4050440 power module or its analogs using 1207A, SG6961SZ (PFC), NCP1396 microcircuits.
MainBoard - the main board (motherboard) is an LD84A module, using 91A6R7TG4 TMDS351 NTP-3000A LGE7863C-LF chips and others.
The TDFV-G135D tuner provides television reception and channel tuning.