Technical description and composition of the LG 32LV2500-ZA TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LV2500-ZA
Chassis / Version: LD01U
Panel: T315XW06 V.3
LED backlight: 73.31T14.004-0-SK1 = 31T15-03A
T-CON: T315XW02 V2 CTRL BD 31T03-C0P
LED driver (backlight): T315HW07 V8 LED Driver BD
PWM LED driver: MAX16814, RM5103
MOSFET LED driver: P3506DD, P1825AS
Power Supply (PSU): EAX62865601 rev1 LGP3237-11SPC1
PWM Power: FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ (Standby)
MOSFET Power: K10A60D
MainBoard: EAX64290501 (0) EBR73156206 SAA35246030 SAA35408715
IC MainBoard: LGE107DC-RP, SAA35408711, MAX3232C, S324M-E1, 25L8006E, LCX244, AP2191D, H5TQ1G63DFR, NTP-7100
Tuner: TDTJ-S001D
Control: IR: LW4500 LV2500 LK550_V1.7
Specifications 32LV2500
LG 32LV2500-ZA
General repair guidelines for TV LCD LED
TV LG 32LV2500-ZA, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. 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.
In the case when the 32LV2500-ZA 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 EAX62865601 rev1 LGP3237-11SPC1 power supply module is probably defective in this case. If it is serviceable with such manifestations, it is necessary to check the power supply stabilizer (converter) of the processor on the motherboard. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
In cases where the LG 32LV2500-ZA TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (a converter for powering the T315XW06 V.3 backlight LEDs). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
A break in the line of LEDs connected in series cannot be detected with a multimeter or tester without disassembling the panel. To open all the transitions, several tens of volts are needed, and it is best to use a current source for such purposes.
In cases of attempts to repair the motherboard L 01U EAX642905001 (0), 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.
If a tuner TDTJ-S001D is suspected to be defective, it should be dismantled and soldered using a soldering station on the side of the planar elements. It is necessary to pay attention to the joints (soldering) with the body and the conclusions of the metal partitions. In most of these cases, the tuner is restored to normal operation. More details can be found on the page Tuner Repair TDTJ-S001D.
Attention to the owners! Attempts at self-repair of the LG 32LV2500-ZA TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC MANUAL -----------------------> LG 32LV2500-ZA Chassis LD01U.
SCHEMATIC MANUAL -----------------------> EAX62865601 rev1 LGP3237-11SPC1 Power Supply schematic
The appearance of the MainBoard EAX64290501 is shown in the figure below:
EAX64290501
EAX64290501 can be used in TVs:
LG 32LV2500-ZA (Panel T315XW06 V.3), LG 37LV3500-ZA (Panel T370HW05 V.1), LG 42LV3400-ZA (Panel T420HW08 V.1), LG 32LK530 (Panel LC320WUD (SC)(A3)), LG 37LK430 (Panel LC370WUE), LG 32LK451 ZA (Panel T315HW04 V.9), LG 42LV3551 (Panel LC420EUN (SD) (V3)), LG 47LW4500 (Panel LC470EUF (SD)(F2)), LG 32LK551 ZB (Panel LC320WUD (SC)(A2)), LG 42LV3500 (Panel LC420EUN (SD)(V3)), LG 42LK551 ZB (Panel V420H2-LH5), LG 42LK451 42LK451-ZG.BRUYLJU (Panel T420HW09 V0), LG 42LK530 (Panel LC420WUF (SC)(A2)), LG 47LK950 ZA (Panel LC470WUF (SD)(P1)), LG 32LW4500 ZB (Panel LC320EUD (SD)(P1)), LG 42LW4500 ZB (Panel LC420EUF (SD)(PX)), LG 42LV4500 DA (Panel LC420EUF (SD)(A1)), LG 32LV4500 (Panel LC320EUD (SD)(A4)), LG 42LV369C (Panel T420HW08 V.9).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX62865601 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FAN7930B 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.
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.
The appearance of the power supply
Main features of the device LG 32LV2500-ZA:
Installed matrix (LED-panel) T315XW06 V.3.
The matrix control uses the Timing Controller (T-CON) T315XW02.
The LED driver T315HW07 is used to power the backlight LEDs, it is controlled by the PWM controller MAX16814, RM5103. As power elements of the LED driver, keys of the type P3506DD, P1825AS are used.
The necessary supply voltages for all nodes of the LG 32LV2500-ZA TV are generated by the EAX62865601 power module or its analogs using FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ (Standby) microcircuits and power switches of the K10A60D type.
MainBoard - the main board (motherboard) is an EAX64290501 module, using chips LGE107DC-RP, SAA35408711, MAX3232C, S324M-E1, 25L8006E, LCX244, AP2191D, H5TQ1G63DFR, NTP-7100 and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T315XW06 V3 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V