Technical description and composition of the SAMSUNG LE37D550 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE37D550 LE37D550K1W
Chassis / Version: U56A / AA01
Panel: T370HW03 V.P
Lamp backlight: 10 Lamp CCFL
T-CON: T315HW04 VB 31T09-C0L
Inverter (backlight): integrated into PSU + INV37T10B
PWM Inverter: BA10358
Trans Inverter: LT-T37A
Power Supply (PSU): BN44-00439B I37F1_BDY
PWM Power: SQT7011K, BD9275
MOSFET Power: K12N50D, 12N50UT
MainBoard: BN41-01603C BN94-05106A
IC MainBoard: Submicom: WT61P805, Eeprom: 24C256, NAND Flash: K4B1G1646G-BCH9
Tuner: BN40-00197A
Technical specifications LE37D550
SAMSUNG LE37D550
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LE37D550 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Most likely in this case, the main switching power supply (IIP) BN44-00439B is faulty. It is necessary to measure its output voltages, and if they are absent, check the operability of the power switches (K12N50D, 12N50UT) of the converters and rectifier diodes for a short circuit probability.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits SQT7011K, BD9275 are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-01603C motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). Board repair and chip replacement Submicom: WT61P805, Eeprom: 24C256, NAND Flash: K4B1G1646G-BCH9 are made with the necessary equipment, and the corresponding hardware base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner BN40-00197A. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
It should be remembered! Attempts to self-repair a SAMSUNG LE37D550 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-serviceability of the device!
Service manual and schematic diagram ------------> SAMSUNG LE37D550 Chassis U56A / AA01
FOR MODELS LE32D550, LE32D551, LE37D550, LE37D551, LE40D550, LE40D551, LE46D550, LE46D551, LE32D570, LE37D570, LE40D570, LE46D570, LE19D450, LE19D451, LE22D450, LE22D451, LE26D450, LE26D451, LE32D450, LE32D451.
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).
The appearance of the power supply
Main features of the SAMSUNG LE37D550 device:
Installed matrix (LCD panel) T370HW03 V.P.
The matrix control uses the Timing Controller (T-CON) T315HW04.
To power the backlight, a converter is used, combined with a power supply, controlled by a BA10358 PWM controller. A transformer LT-T37A is installed in the inverter converter.
The necessary supply voltages for all nodes of the SAMSUNG LE37D550 TV are generated by the BN44-00439B power module or its analogs using SQT7011K, BD9275 microcircuits and power switches of the K12N50D, 12N50UT type.
MainBoard - the main board (motherboard) is a BN41-01603C module, using Submicom chips: WT61P805, Eeprom: 24C256, NAND Flash: K4B1G1646G-BCH9 and others.
The tuner BN40-00197A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T370HW03 VP
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V