Technical description and composition of the LG 32LD345 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LD345
Chassis / Version: LP91H // LD01B
Panel: LC320WXE-SCA1
T-CON: 6870C-0313B
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F
Power Supply (PSU): EAX61124201 / 14 rev1.1 // EAX63329201 (9)
PWM Power: STR-W6053N, HS01G (PFC)
MOSFET Power: 13NM60N, 2SK3868
MainBoard: EAX61354204
IC MainBoard: AOZ1072 AOZ1073AI MP2212D Sound NTP-7100 25Q80BVSIG
Tuner: TDTJ-S001D
Control: IR: EBR64965302 BM-LDS103 VER 1.0
Specifications 32LD345
LG 32LD345
General recommendations for repairing TV LCD
LG TV, made on the LP91H chassis, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. 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 LG 32LD345 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the EAX61124201 / 14 rev1.1 power supply module. In some cases, only the processor power regulator may be faulty. 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.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason that you should look for by checking other elements of the primary circuit - electrolytic capacitors, PWM controller STRW6053N, which can be checked only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the LG 32LD345 does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors. 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 during work, 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.
If the motherboard is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, as well as, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In some cases, they require checking or replacing (if necessary) the elements of the MB board (SSB) - AOZ1072 AOZ1073AI MP2212D sound NTP-7100 25Q80BVSIG, TDTJ-S001D. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Malfunctions of the TDTJ-S001D tuner in most cases are eliminated by the method of total soldering it from the side of planar elements. This will require the dismantling of the tuner. Read more about the restoration on the Repair Tuner TDTJ-S001D page.
It should be remembered! Attempts to repair the LG 32LD345 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device.........
Service manual and schematic diagram-------> LG 32LD330/330C, 32LD330/330C-TA, 32LD331C/340, 32LD331C/340-TA, 32LD341C/342C, 32LD341C/342C-TA, 32LD345, 32LD345-TB Chassis LP91H.
Service manual and schematic diagram-------> LG CHASSIS LD01B; MODEL: 32LD340/350/350C/350N/358, 32LD340/350/350C/350N/358-ZA, 32LD341/351/359, 32LD341/351/359-ZB.
Service manual and schematic diagram PSU -------> LGP42-10LF EAX61124201 EAY60869402 Power supply.
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
On the 32LD345 TV, the EAX61124201 / 14 rev1.1 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 step-up converter based on the HS01G PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current is determined by its reactance (of the order of 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 32LD345:
Installed matrix (LCD-panel) LC320WXE-SCA1.
The matrix control uses the Timing Controller (T-CON) 6870C-0313B.
To power the backlight, a converter is used, combined with the power supply, controlled by the BD9270F PWM controller.
The necessary supply voltages for all nodes of the LG 32LD345 TV are generated by the EAX61124201 power module or its analogs using STR-W6053N, HS01G (PFC) microcircuits and 13NM60N, 2SK3868 power switches.
MainBoard - the main board (motherboard) is an EAX61354204 module, using AOZ1072 AOZ1073AI MP2212D chips NTP-7100 25Q80BVSIG and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320WXE-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.0 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V