Technical description and composition of the LG RZ-17LZ20 TV, panel type and applicable modules. The composition of the modules.LG
Model: RZ-17LZ20
Chassis / Version: ALPLWR3
Panel: 17 inch
Inverter (backlight): CIU11-K004 6633VA0003R
PWM Inverter: BD9766FV,
Trans Inverter: 1032 0339J
MainBoard: ML-027C 6870VM0430H
IC MainBoard: LM2941S, PW181-10V,
Tuner: TAFH-S312D
Technical Specifications RZ-17LZ20
LG RZ-17LZ20
General recommendations for repairing TV LCD
Repair of an LG TV with the ALPLWR3 chassis should begin with a fault diagnosis, which involves a careful inspection of the external and internal elements of the device. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. 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 the case when the RZ-17LZ20 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink bulbs and does not show any signs of operability, the power supply module is probably defective in this case. If it is serviceable with such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. In general, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the LG RZ-17LZ20 does not have an 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 common power supply are working. 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.
Diagnosis and repair of the motherboard ML-027C 6870VM0430H is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required. Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LM2941S, PW181-10V, tun TAFH-S312D and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Owners and users of the LG RZ-17LZ20 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!
Service manual / schematic diagram -------------> LG RT-17LZ20 Chassis ML-027C
Main features of the device LG RZ-17LZ20:Installed matrix (LCD-panel) 17 inches.
To power the backlight, an inverter CIU11-K004 is used, it is controlled by the PWM controller BD9766FV,. A transformer 1032 0339J is installed in the inverter converter.
The required supply voltage for all nodes of the TV LG RZ-17LZ20 provides a switching power supply.
MainBoard - the main board (motherboard) is an ML-027C module, using LM2941S, PW181-10V, and others.
The TAFH-S312D tuner provides television reception and channel tuning.
