Technical description and composition of the LG 22LS4D-ZB TV, panel type and applicable modules. The composition of the modules.LG
Model: 22LS4D-ZB
Chassis / Version: LD73B
Panel: LM220WE1
Inverter (backlight): YP1922-4L Rev1.4
PWM Inverter: OZ9938GK
MOSFET Inverter: 95636H 62P03CH
Trans Inverter: IT1922 NY0803
Power Supply (PSU): YP1922-4L Rev1.4
PWM Power: NCP1271
MOSFET Power: P10NK80Z
MainBoard: EAX37846002
IC MainBoard: FL18548H
Tuner: EBL32961504
Technical Specifications 22LS4D
LG 22LS4D-ZB
General recommendations for repairing TV LCD
LG TV, made on the basis of the LD73B chassis, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Often, for certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
In the case when the 22LS4D-ZB does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the power supply module YP1922-4L Rev1.4 is probably faulty 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. Diagnostics and repair of the general power supply unit should always begin by checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
Sometimes the LG 22LS4D-ZB TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the inverter itself, including the power supply unit (power supply unit). 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 they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
Repair or diagnostics of the motherboard LD73B EAX37846002 should begin by checking the stabilizers or power converters of its chips. If necessary, you should update the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements, for example, FL18548H, tun EBL32961504 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC MANUAL ----------------------------> LG 22LS4D-ZB Chassis LD73B
Main features of the device LG 22LS4D-ZB:
Installed matrix (LCD-panel) LM220WE1.
The YP1922-4L inverter is used to power the backlight, controlled by the OZ9938GK PWM controller. The transformer IT1922 NY0803 is installed in the inverter converter. As power elements of the inverter, keys of the type 95636H 62P03CH are used.
The necessary supply voltages for all nodes of the LG 22LS4D-ZB TV are generated by the YP1922-4L power supply module or its analogs using NCP1271 microcircuits and power switches of the P10NK80Z type.
MainBoard - the main board (motherboard) is an EAX37846002 module, using FL18548H chips and others.
The tuner EBL32961504 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM220WE1-TLP2
Type: a-Si TFT-LCD, Panel
Diagonal size: 22.0 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 473.76x296.1 mm
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL
Signal Interface: LVDS (2 ch, 8-bit)
Voltage: 5.0V