Technical description and composition of the LG 26LH2000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 26LH2000
Chassis / Version: LD91A
Panel: T260XW02 V.R
Lamp backlight: 8 CCFL
T-CON: T260XW02 VQ CTBL BD
Inverter (backlight): 6632L-0550A PPW-EE26HD-0 (A)
PWM Inverter: BD9219FV
MOSFET Inverter: MDD1752
Power Supply (PSU): EAX55176301 / 10 - LGP26-09P
PWM Power: L6599D (PWM Resonant), L6562A (PFC), ICE3B0365J
MOSFET Power: 13A60, 5A60
MainBoard: EAX60686904 (2
IC MainBoard: Cpu: LGE3368A-LF-SF, NAND Flash: HY27US08121B-TPCB, SPI Flash: W25X32VSSIG, Eeprom: M24C512, Audio: NTP-3100L
Tuner: TDFW-G235D
Specifications 26LH2000
LG 26LH2000
General recommendations for repairing TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of operations for their dismantling. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, 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 26LH2000 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink bulbs and does not show any signs of operability, the LGP26-09P - EAX55176301 / 10 power supply module is probably defective in this case. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors 13A60, 5A60 in the primary circuit.
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 chip of the PWM controller L6599D, L6562A, ICE3B0365J may be malfunctioning. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the LG 26LH2000 TV does not have an image, but there is sound, make sure that the backlight power converter (inverter) is working properly. It is also necessary to check the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for excessive ESR. It should be remembered that when protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is necessary to restore all standard converter protection circuits.
Diagnosis and repair of the motherboard EAX60686904 (2 usually starts with a test of the stabilizers and power converters of the module chips. In some cases, a software update is required. Complex MB (SSB) repair is possible only in the conditions of a service center with the necessary equipment. Check or replacement of Cpu elements: LGE3368A-LF-SF, NAND Flash: HY27US08121B-TPCB, SPI Flash: W25X32VSSIG, Eeprom: M24C512, Audio: NTP-3100L requires the necessary training and professional skills to repair modules at the component level. Problems associated with and Using soldering technology, BGA can sometimes be diagnosed by warming up.
Before changing the TDFW-G235D tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner terminals and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope.
For 26LH2000 TV owners, we recommend that you contact qualified professionals with work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC MANUAL ---->LG CHASSIS: LD91A; MODEL : 26LH2000, 26LH2000-ZA, 26LH2010, 26LH2010-ZB.
SCHEMATIC MANUAL POWER SUPPLY ---------------> LGP32-09P POWER SUPPLY
The appearance of the MainBoard EAX60686904 is shown in the figure below:EAX60686904
EAX60686904 can be used in TVs:
LG 32LD320 (Panel T315XW03 V1), LG 32LD320-ZA (Panel T315XW03), LG 32LH4000-ZA (Panel LC320WUN), LG 32LH2000 (Panel LK315T3LA57), LG 32LH2010 (Panel LK315T3LA57), LG 32LF2510 ZB (Panel LC320WUN (SA)(B3)), LG 37LH2000 (Panel LC370WXE (SB)(A1)), LG 19LD320 ZA (Panel M185B1-L02 Rev.C3), LG 26LH2000 (Panel T260XW02 V.R), LG 32LG2100 (Panel LC320WXN), LG 22LH2000 ZA (Panel V216B1-L02), LG 42LH2000 ZA.ARUVLH (Panel LC420WXE (SB)(A1)), LG 32LD321 32LD321-ZB (Panel T315XW03 V1), LG 26LD320 (Panel T260XW04 V.3), LG 19LH2000 19LH2000-ZA (Panel M185B1-L03).
PSU Advanced
On the 26LH2000 TV, the EAX55176301 power module is installed using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the L6562A PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the value of the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the device LG 26LH2000:
Installed matrix (LCD panel) T260XW02 V.R.
The matrix control uses the Timing Controller (T-CON) T260XW02.
To power the backlight applies 6632L-0550A inverter is controlled by PWM controller BD9219FV. As power elements of the inverter, keys of the MDD1752 type are used.
The necessary supply voltages for all nodes of the LG 26LH2000 TV are generated by the EAX55176301 power supply module or its analogs using L6599D (PWM Resonant), L6562A (PFC), ICE3B0365J microcircuits and 13A60, 5A60 power switches.
MainBoard - the main board (motherboard) is an EAX60686904 module, using Cpu microcircuits: LGE3368A-LF-SF, NAND Flash: HY27US08121B-TPCB, SPI Flash: W25X32VSSIG, Eeprom: M24C512, Audio: NTP-3100L and others.
The TDFW-G235D tuner provides TV 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