Technical description and composition of the SAMSUNG LA32B350F1 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LA32B350F1
Chassis / Version: G3F32CCN
Panel: LTF320AP06
T-CON: 320AP03C2LV0.2
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2006
MOSFET Inverter: FDPF5N50UT
Trans Inverter: LT-LU32
Power Supply (PSU): BN44-00289B
PWM Power: FAN7530 (PFC), ICE3BR0665J
MOSFET Power: IPA60R600CP (PFC)
MainBoard: BN41-01199A BN94-03060A
IC MainBoard: CPU: SEMS03-LF; DRAM: K4T51163Q; EEPROM: AT24C256; SOUND: NTP-3200;
Tuner: BN40-00142B - TCPS3001PD11S (H)
Appearance
SAMSUNG LA32B350F1
General repair guidelines for TV LCD
SAMSUNG LA32B350F1 TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. 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 often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external signs of certain malfunctions.
Faults in the BN44-00289B power supply module can be expressed in different ways, for example, SAMSUNG LA32B350F1 does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the IPA60R600CP (PFC) power key (s) can be detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
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 FAN7530 PIM controller chip (PFC), ICE3BR0665J, may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
In cases where the SAMSUNG LA32B350F1 TV has lost an image, and the sound is there and all other functions are operational, 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. It must be borne in mind that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and special care should be taken. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU board: SEMS03-LF; DRAM: K4T51163Q; EEPROM: AT24C256; SOUND: NTP-3200; . In cases where the BGA processor is used, its malfunction is usually detected by local heating.
If a tuner BN40-00142B - TCPS3001PD11S (H) is suspected, it is first necessary to verify the correctness of the software, as well as the presence of the necessary power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Attention! Users and owners of LA32B350F1 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Samsung Chassis : G3F26CCN, G3F32CCN Model : LA26B350F1, LA32B350F1
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> BN44-00289B.
According to the conditions of compliance with modern world standards for household switching power supplies, the BN44-00289B 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 LA32B350F1 device:
Installed matrix (LCD-panel) LTF320AP06.
The matrix control uses the Timing Controller (T-CON) 320AP03C2LV0.2.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller SEM2006. A transformer LT-LU32 is installed in the inverter converter. As power elements of the inverter, keys of the FDPF5N50UT type are used.
The necessary supply voltages for all nodes of the SAMSUNG LA32B350F1 TV are generated by the BN44-00289B power supply module or its analogs using FAN7530 (PFC), ICE3BR0665J microchips and IPA60R600CP (PFC) type power switches.
MainBoard - the main board (motherboard) is a BN41-01199A module, using CPU chips: SEMS03-LF; DRAM: K4T51163Q; EEPROM: AT24C256; SOUND: NTP-3200; and others.
Tuner BN40-00142B - TCPS3001PD11S (H) provides the reception of television programs and tuning to channels.
Information from an alternative source:
SAMSUNG LA32B350F1 Chassis G3F32CCN
Panel Type (Matrix): LTF320AP06
Motherboard: BN41-01199A BN94-03060A,
T-con: 320AP03C2LV0.2
PSU: BN44-00289B, Diagram BN44_00289B
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF320AP06
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
