Technical description and composition of the SAMSUNG LE32D451 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32D451 LE32D451G3W
Chassis / Version: AO01
Panel: T315XW03 V.D
T-CON: T315XW07 V2 CTRL BD, 31T18-C01
Inverter (backlight): SST320_4UA01
PWM Inverter: OZ9938GN
MOSFET Inverter: AP4506GEH
Power Supply (PSU): BN44-00438A PSIV121411A
PWM Power: ICE3BR1065JF, FAN7530 (PFC)
MainBoard: BN41-01603C // BN41-01603B BN94-04615P
IC MainBoard: Eeprom: 24C256, Submicom: WT61P805
Tuner: DIDS40FVL082A BN40-00197A
Control: AA59-00484A
Specifications LE32D451
SAMSUNG LE32D451
General repair guidelines for TV LCD
It is advisable to start the diagnostics of a malfunction of the SAMSUNG LE32D451 TV, as well as all others, with an external examination of both external and internal elements. Many changes visible to the naked eye make it possible to determine the future direction of troubleshooting and localization of the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters deformed after boiling, cracked soldering on the terminals of the elements can often tell the cause of the defect and possible consequences.
In the case when the LE32D451 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink bulbs and does not show any signs of operability, most likely the BN44-00438A power supply module is faulty in this case. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it is broken, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
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, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, 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.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the SAMSUNG LE32D451 TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (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 SST320_4UA01 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.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during operations, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
If the BN41-01603C motherboard is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
Attention to users! Self-repair of a SAMSUNG LE32D451 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATICS ---> Samsung LA(LE)32D451 Chassis U56A, U56B.
PSU SCHEMATICS ----> BN44-00438A Power Supply schematic diagram.
The appearance of the MainBoard BN41-01603C is shown in the figure below:
BN41-01603C
BN41-01603C can be used in TVs:
SAMSUNG LE32D451 LE32D451G3W (Panel T315XW03 VD), SAMSUNG LE40D550K1W LE40D550 (Panel LTF400HM03), SAMSUNG LE26D451 LE26D451G3W (Panel T260XW04 V.8), SAMSUNG LE40D551 LE40D551K2W (Panel LTF400HM03), SAMSUNG LE32D450 LE32D450G1W (Panel T315XW03 VD), SAMSUNG LE37D550 LE37D550K1W (Panel T370HW03 VP).
PSU Advanced
The power module BN44-00438A 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 the FAN7530 PWM controller, which 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 LE32D451 device:
Installed matrix (LCD panel) T315XW03 V.D.
The matrix control uses the Timing Controller (T-CON) T315XW07.
To power the backlight, an inverter SST320_4UA01 is used, it is controlled by the PWM controller OZ9938GN. As power elements of the inverter, keys of the AP4506GEH type are used.
The necessary supply voltages for all nodes of the TV SAMSUNG LE32D451 are generated by the power module BN44-00438A, or its analogs using ICE3BR1065JF, FAN7530 (PFC) microcircuits.
MainBoard - the main board (motherboard) is a BN41-01603C module, using Eeprom: 24C256, Submicom: WT61P805 and others.
Tuner DIDS40FVL082A BN40-00197A provides the reception of television programs and tuning to channels.
Information from an alternative source:
SAMSUNG LE32D451G3WXRU Chassis U56A
Panel Type (Matrix): T315XW03 V.D.
Motherboard: BN41-01603C, Tuner: DIDS40FVL082A BN40-00197A, INVERTOR: SST320_4UA01
PSU: BN44-00438A
Remote control: AA59-00484A
Additional technical information about the panel:
Brand: AUO
Model: T315XW03 VD
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V