Technical description and composition of the LG RZ-23LZ41 TV, panel type and applicable modules. The composition of the modules.LG
Model: RZ-23LZ41
Chassis / Version: ML-041A
Panel: LC230W01 (B2)
Inverter (backlight): YPNL-M007C LC230W01-A2 6632L-0030C 2300KF9001C
PWM Inverter: BIT3106
MOSFET Inverter: 4532GM
Trans Inverter: XT-12200-2222R4-0425
Power Supply (PSU): LCD23L LCD23LA
PWM Power: L6561D (PFC), KA34063A, KA339D
MOSFET Power: 20N60S5, 11N80C3
MainBoard: 6870T802A66 040702 L.K.YL.H.I
IC MainBoard: gm5221H, MST9883C, M52758FP
Tuner: TAEW-G051D 6700VS0003A
Control: 6711R1P072B, IR: 6870T948D10
Technical Specifications RZ-23LZ41
LG RZ-23LZ41
General recommendations for repairing TV LCD
Possible malfunctions
- The LG RZ-23LZ41 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the LCD23L main power module. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (20N60S5, 11N80C3) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips L6561D (PFC), KA34063A, KA339D are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuit should be restored immediately after the repair is completed.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 6870T802A66 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). 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 - gm5221H, MST9883C, M52758FP 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.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner TAEW-G051D 6700VS0003A. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, remind users! Attempts to self-repair a TV LG RZ-23LZ41 without the appropriate qualifications and the necessary experience can lead to its complete unrepairability!
Service manual / schematic diagram -------------> LG RZ-23LZ41 Chassis ML-041A
The appearance of the MainBoard 6870T802A66 is shown in the figure below:6870T802A66
The appearance of the power supply
Main features of the device LG RZ-23LZ41:
The matrix (LCD panel) LC230W01 (B2) is installed.
To power the backlight, an inverter YPNL-M007C is used, it is controlled by the BIT3106 PWM controller. The transformer XT-12200-2222R4-0425 is installed in the inverter converter. As power elements of the inverter, keys of type 4532GM are used.
The necessary supply voltages for all nodes of the LG RZ-23LZ41 TV are generated by the LCD23L power supply module or its analogs using L6561D (PFC), KA34063A, KA339D microchips and power switches of the type 20N60S5, 11N80C3.
MainBoard - the main board (motherboard) is a module 6870T802A66, using microchips gm5221H, MST9883C, M52758FP and others.
Tuner TAEW-G051D 6700VS0003A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC230W01-B2
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1280x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 501.12x300.67 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 70%
Response Time: 15/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 12.0V
