Technical description and composition of the LG 26LG30R TV, panel type and applicable modules. The composition of the modules.LG
Model: 26LG30R
Chassis / Version: LP81A
Panel: V260M1
Inverter (backlight): VIT70033.50
PWM Inverter: OZ964SN, AS324-E1
Power Supply (PSU): OPVP-0059
PWM Power: STR-W6253, L6599D (PWM Resonant), UCC28051 (PFC)
MOSFET Power: 2SK3528, K4100
MainBoard: LGE6891DD-1LF
IC MainBoard: NTP-3000A, 81EXENT, TMDS35, HYB25DC256163CE-4,
Specifications 52LG5030
LG 26LG30R
General recommendations for repairing TV LCD
Repair of all electronic devices, including the LG TV, based on the V260M1 chassis, it is advisable to start with an external examination of its external and internal elements. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
If the OPVP-0059 power supply module fails, the external manifestations may be different, for example, the LG 26LG30R does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Sometimes the LG 26LG30R 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 when working, 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.
In cases of attempts to repair the motherboard LGE6891DD-1LF, it is necessary to check the operability of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating. In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - NTP-3000A, 81EXENT, TMDS35, HYB25DC256163CE-4 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Owners and users of the LG 26LG30R 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 26LG30R, 26LG30R-MA Chassis LP81A
Main features of the device LG 26LG30R:
Installed matrix (LCD-panel) V260M1.
To power the backlight, an inverter VIT70033.50 is used, it is controlled by the PWM controller OZ964SN, AS324-E1.
The necessary supply voltages for all nodes of the LG 26LG30R TV are generated by the OPVP-0059 power module or its analogs using the STR-W6253, L6599D (PWM Resonant), UCC28051 (PFC) microcircuits and 2SK3528, K4100 type power switches.
MainBoard - the main board (motherboard) is a module LGE6891DD-1LF, using NTP-3000A, 81EXENT, TMDS35, HYB25DC256163CE-4, and others.