Technical description and composition of the SAMSUNG LA32C350D1 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LA32C350D1
Chassis / Version: N89B / N89A
Panel: T315HA01-DB
Inverter (backlight): integrated into PSU
PWM Inverter: LX6523AID
Power Supply (PSU): BN44-00369C
PWM Power: LX6523A, FAN7530 (PFC), ICE3BR0665JZ (Standby)
MOSFET Power: 10NM60M, 5N50UT
MainBoard: BN41-01372A
IC MainBoard: MX25L6405DMI-12G, 24LC02B, AT24C256, K4T51163Q DDR2-800, DRV603, TAS5715
Appearance
SAMSUNG LA32C350D1
General repair guidelines for TV LCD
Like any other TV, SAMSUNG LA32C350D1 repair is advisable to start with a careful examination of the external and internal elements. It often happens that some damage to elements or connections will help determine the direction of troubleshooting and localization of the defect. 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 power supply module BN44-00369C is faulty, the external manifestations may be different, for example, SAMSUNG LA32C350D1 does not turn on at all and there is no indication of the indicator lights on the front panel. When diagnosing and repairing the power supply, first of all, it is necessary to 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 or power switch 10NM60M, 5N50UT.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors of the N-FET type 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 resistors of the primary power supply circuit, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the FAN7530, LX6523AID PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
The power supply unit contains a power factor correction unit (KKM, PFC), troubleshooting in such modules becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation. The typical value of the voltage across the electrolytic capacitor of the rectifier filter in the operating mode should be about 380 volts.
The SAMSUNG LA32C350D1 TV has a BN44-00369C power module, which is combined with an inverter - converter for powering the backlight. When repairing by replacing components, this circuitry option does not complicate the search for defects and is popular in the latest TV models from many manufacturers.
In cases where the SAMSUNG LA32C350D1 TV has lost an image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It should 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.
Diagnostics of the BN44-00369C inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible leakage. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
In such cases, special care should be taken during diagnosis, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Diagnosis and repair of the BN41-01372A motherboard is carried out by checking the performance of power stabilizers or updating the software (software). In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - MX25L6405DMI-12G, 24LC02B, AT24C256, K4T51163Q DDR2-800, DRV603, TAS5715 which may require replacement with new ones.
Owners and users of the SAMSUNG LA32C350D1 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
According to the conditions of compliance with modern world standards for household switching power supplies, the BN44-00369C module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FAN7530 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 mains capacitor indicates the serviceability of the PFC node.
Main features of the SAMSUNG LA32C350D1 device:
Installed matrix (LCD-panel) T315HA01-DB.
To power the backlight, a converter is used, combined with the power supply, controlled by the LX6523AID PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG LA32C350D1 television are generated by the BN44-00369C power supply module or its analogs using LX6523A, FAN7530 (PFC), ICE3BR0665JZ (Standby) microcircuits and 10NM60M, 5N50UT power switches.
MainBoard - the main board (motherboard) is a module BN41-01372A, using microchips MX25L6405DMI-12G, 24LC02B, AT24C256, K4T51163Q DDR2-800, DRV603, TAS5715 and others.Information from an alternative source:
SAMSUNG LA32C350D1 Chassis N89B / N89A
Panel Type (Matrix): T315HA01-DB
Motherboard: BN41-01372A, MX25L6405DMI-12G, 24LC02B, AT24C256, K4T51163Q DDR2-800,512Mbit, DRV603, TAS5715, PSU &
Invertor: BN44-00369C, FAN7530, 10NM60M, LX6523AID, 5N50UT x2, LA32C350D1 VER BN02