Technical description and composition of the LG 26LD355-ZA TV, panel type and applicable modules. The composition of the modules.LG
Model: 26LD355-ZA
Chassis / Version: LD01B
Panel: T260XW04 V.3
T-CON: 31T10-TOO T315XW04 V1 TEST BD
Inverter (backlight): VIT71886.00 REV: 2LOGAH
PWM Inverter: OZ964SN, AS324M-G1
MOSFET Inverter: P2904BD, P4004ED
Power Supply (PSU): LGP26-10P EAX61464001 / 8
PWM Power: ICE3B0365J (Standby), L6599D (PWM Resonant), L6562A (PFC)
MOSFET Power: K12A60D
MainBoard: EAX61354204 (0)
IC MainBoard: CPU: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I
Tuner: TDTJ-S001D
Control: AKB72915207
Specifications 26LD355
LG 26LD355-ZA
General recommendations for repairing TV LCD
LG 26LD355-ZA, like other televisions, it is advisable to start repairing from inspection of external and internal elements and modules. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Experienced repairmen are well aware of how ring cracks in soldered terminals look, swollen capacitors, and other causes of problems in electronic devices.
If the LGP26-10P EAX61464001 / 8 power supply module fails, the external manifestations may be different, for example, the LG 26LD355-ZA does not turn on at all and there is no indication of the indicator lights on the front panel. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM PWM controller chip may also cause a breakdown of the power switch of the converter.
In cases where the LG 26LD355-ZA TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. It should be remembered that when the protection is turned off 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.
In cases of attempts to repair the motherboard EAX61354204 (0), it is necessary to check the operability of the linear stabilizers and power converters of its microcircuits and, if possible, update the software (software). BGA chips can sometimes be diagnosed with local heating. In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before changing the tuner TDTJ-S001D, if it is not possible to tune to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners of the 26LD355-ZA TV are advised to contact qualified personnel with experience only for repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
The appearance of the MainBoard EAX61354204 is shown in the figure below:EAX61354204
EAX61354204 can be used in TVs:
LG 32LD345 (Panel LC320WXE-SCA1), LG 37LD450 (Panel LC370WUG (SC)(A1)), LG 42LD455-ZA (Panel LC420WUG), LG 32LD550 (Panel LK315D3LA57), LG 42LD450 ZA (Panel LC420WUG (SC)(A1)), LG LG32LD350 32LD350 (Panel T315HW04 V.8), LG 42LD420 ZA (Panel LC420WUG (SC)(A1)), LG 37LD420 ZA (Panel T370HW03 V.B), LG 32LD420 ZA (Panel LC320WUG (SC)(A1)), LG 32LD555 ZC (Panel LC320WUG (SC)(A1)), LG 26LD355-ZA (Panel T260XW04 V.3), LG 37LD425 ZA (Panel T370HW03 V.B), LG 32LD425 (Panel LC320WUG (SC)(A1)), LG 32LD340 32LD340-ZA.BRUWLJU (Panel LC320WXE (SC)(A1)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the LGP26-10P module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the L6562A PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.The appearance of the power supply
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
Main features of the device LG 26LD355-ZA:
Installed matrix (LCD panel) T260XW04 V.3.
The matrix control uses the Timing Controller (T-CON) 31T10-TOO.
To power the backlight, the inverter VIT71886.00 is used, it is controlled by the PWM controller OZ964SN, AS324M-G1. As power elements of the inverter, keys of the type P2904BD, P4004ED are used.
The necessary supply voltages for all nodes of the LG 26LD355-ZA TV are generated by the LGP26-10P power supply module or its analogs using ICE3B0365J (Standby), L6599D (PWM Resonant), L6562A (PFC) microcircuits and K12A60D type power switches.
MainBoard - the main board (motherboard) is an EAX61354204 module using CPU chips: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T260XW04 V3
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 13%), 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: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
