Technical description and composition of the LG RZ-26LZ50 TV, panel type and applicable modules. The composition of the modules.LG
Model: RZ-26LZ50
Chassis / Version: ML-041A
Panel: LC260W01 (A5) (KA)
T-CON: 6870C-0011D
Inverter (backlight): 6632L-0053D - LC260W01 - 2300KFG018A - YPNL
PWM Inverter: OZ972CN
MOSFET Inverter: SI4532A
Power Supply (PSU): 6871TPT275E
PWM Power: FA5501A (PFC), STR-T2268
MOSFET Power: 2SK3681
MainBoard: ML-041A - 6870T802A71 - 041222
IC MainBoard: VCT49XYF PZ C7, GM5221H-LF, AT49F001N, MST9883
Tuner: TAEW-G053D
Technical Specifications RZ-26LZ50
LG RZ-26LZ50
General recommendations for repairing TV LCD
It is advisable to start repairing an LG TV with the ML-041A chassis with a careful external inspection of both internal and external elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the RZ-26LZ50 TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or power converter of the control processor may be malfunctioning, which is typical for some LG models. In the general case, 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.
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 RZ-26LZ50 has no image, but there is sound and the TV is controlled from 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. 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 their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - VCT 49 XYF C7 V: 4.7 GM 5221H-LF AT 49F001N MST 9883C with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Once again, remind users! Attempts to self-repair a TV LG RZ-26LZ50 without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------> LG RZ-26LZ50 Chassis ML-041A
The appearance of the MainBoard ML-041A is shown in the figure below:ML-041A
ML-041A can be used in TVs:
LG RZ-23LZ50 (Panel LC230W01 (B2)), LG RZ-26LZ50 (Panel LC260W01 (A5) (KA)).
The appearance of the power supply
Main features of the device LG RZ-26LZ50:
Installed matrix (LCD panel) LC260W01 (A5) (KA).
The matrix control uses the Timing Controller (T-CON) 6870C-0011D.
To power the backlight, an inverter 6632L-0053D is used, controlled by the PWM controller OZ972CN. As power elements of the inverter, keys of type SI4532A are used.
The necessary supply voltages for all nodes of the LG RZ-26LZ50 TV are generated by the power supply module 6871TPT275E, or its analogs using the FA5501A (PFC), STR-T2268 microchips and 2SK3681 power switches.
MainBoard - the main board (motherboard) is an ML-041A module, using VCT49XYF PZ C7, GM5221H-LF, AT49F001N, MST9883 and other chips.
The TAEW-G053D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC260W01-A5KA
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1280x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 566.4x339.84 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 7.5 / 8.5 (Tr / Td)
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 12.0V
