Technical description and composition of the SAMSUNG LE32B450C4 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32B450C4 LE32B450C4W
Chassis / Version: N65A
Panel: LTF320AP06
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2006
MOSFET Inverter: 4N60
Trans Inverter: LT-HV32 400mH
Power Supply (PSU): BN44-00260C
PWM Power: FAN7530 (PFC), ICE3BR0665J
MOSFET Power: 7N60
MainBoard: BN41-01165A
IC MainBoard: CPU: SEMS12, DRAM: K4T511630G-HCE7, SPI Flash: 25L6405DMI-12G, NTP3200
Tuner: BN40-00137A DNOQ403SH151A (S)
Specifications LE32B450
SAMSUNG LE32B450C4
General repair guidelines for TV LCD
It is advisable to start any repair and diagnostics of the SAMSUNG LE32B450C4 TV with a careful external examination of the internal and external elements, including case parts, display, buttons and cables. Many changes visible to the naked eye make it possible to determine the further direction of troubleshooting and localization of the defect. In some cases, faulty elements are visible to the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldering of the terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In cases where the SAMSUNG LE32B450C4 TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the BN44-00260C power supply module is most likely faulty or, which happens much less often - there is no power to the processor on the motherboard. In this case, first of all, it is necessary to check the fuse at the mains input. 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 N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the reason 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 microchip of the PWM controller FAN6961, STRW6252, 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 using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
The SAMSUNG LE32B450C4 TV power supply BN44-00260C includes a display backlight power supply unit. This variant of circuit design is widespread in modern LCD TVs and does not significantly interfere with diagnostics and repair at the component level.
If the SAMSUNG LE32B450C4 TV does not have an image, but there is sound, the malfunction should be sought in the backlight lamp power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
Repair of the BN44-00260C inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
The motherboard BN41-01165A must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the power supply circuits of the microcircuit are working properly, a software update may be necessary.
Once again, remind users! Attempts to self-repair a SAMSUNG LE32B450C4 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATICS: Samsung LE19B45***, LE22B45***, LE26B45***, LE32B45*** Chassis N65A, N65B.
PSU SCHEMATICS BN44-00260C Power Supply schematic diagram.
LE32B450C7W - Panel:LTF320AP06, Tcon: 320AP03C2LV0.2, PSU: BN44-00260C FSP118-3PI01
The appearance of the MainBoard BN41-01165A is shown in the figure below:BN41-01165A
BN41-01165A can be used in TVs:
SAMSUNG LE32B450C4 LE32B450C4W (Panel LTF320AP06), SAMSUNG LE37B530P7 LE37B530P7W (Panel AX094F040E), SAMSUNG LE40B530P7 LE40B530P7W (Panel LTF400HA08), SAMSUNG LE46B530P7 LE46B530P7W (Panel V460H1-L06 RevC1), SAMSUNG LE32B530 LE32B530P7W (Panel LTF320HA09), SAMSUNG LE40B531 LE40B531P7W (Panel LTF400HA08) .
PSU Advanced
The BN44-00260C power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on a FAN7530 PWM controller that evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of the increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the SAMSUNG LE32B450C4 device:
Installed matrix (LCD-panel) LTF320AP06.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller SEM2006. A transformer LT-HV32 400mH is installed in the inverter converter. As power elements of the inverter, keys of type 4N60 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32B450C4 TV are generated by the BN44-00260C power module or its analogs using FAN7530 (PFC), ICE3BR0665J microchips and 7N60 type power switches.
MainBoard - the main board (motherboard) is a BN41-01165A module, using CPU chips: SEMS12, DRAM: K4T511630G-HCE7, SPI Flash: 25L6405DMI-12G, NTP3200 and others.
The tuner BN40-00137A DNOQ403SH151A (S) provides the reception of television programs and tuning to channels.
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
