Technical description and composition of the LG 26LG4000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 26LG4000
Chassis / Version: LD86A
Panel: T260XW02 V.R
T-CON: T260XW02 VQ 26T02-C09
Inverter (backlight): V225-4XX E206453
Power Supply (PSU): OPVP-0059 Rev: J - EAY40503202
PWM Power: STR-W6253, L6599D (PWM Resonant), UCC28051 (PFC)
MOSFET Power: 2SK3528, K4100
MainBoard: EAX50912202 (0)
IC MainBoard: NTP-3000A
Tuner: TDFV-G135D
Control: IR: YW9N392402A 9N311AH0000
Specifications 52LG5030
LG 26LG4000
General recommendations for repairing TV LCD
Repair and diagnostics of any electronic device, in particular LG with the LD86A chassis, it is advisable to start with a careful external examination of internal and external elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting, 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.
Faults in the OPVP-0059 Rev: J power supply module can be expressed in different ways, for example, the LG 26LG4000 does not turn on at all and the control lights on its front panel do not light up and do not blink, and there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) 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.
If the LG 26LG4000 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU. When disabling the inverter protection (to enable diagnostics), special care must be taken in view of the risk of failure of 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.
Remember! Attempts to self-repair by users of the LG 26LG4000 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
schematic manual ----------------------------------------> LG 26LG4000, 26LG4000-ZA Chassis LD86A
The appearance of the MainBoard EAX50912202 is shown in the figure below:EAX50912202
EAX50912202 can be used in TVs:
LG 26LG4000 (Panel T260XW02 V.R), LG 32LG4000 ZA (Panel LC320WXN (SB)(A3)).
Main features of the device LG 26LG4000:
Installed matrix (LCD panel) T260XW02 V.R.
The matrix control uses the Timing Controller (T-CON) T260XW02.
To power the backlight used inverter V225-4XX.
The necessary supply voltages for all nodes of the LG 26LG4000 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 an EAX50912202 module, using NTP-3000A chips and others.
The TDFV-G135D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VR
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V