Technical description and composition of the SAMSUNG LE32R51B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32R51B
Chassis / Version: RE32EO
Panel: LTA320W2-L01
Inverter (backlight): KLS-320VE-J
Power Supply (PSU): BN41-00522B
PWM Power: VIPER12A, ICE1PCS02, STR-W6755
MOSFET Power: 18N50
MainBoard: BN41-00545D
IC MainBoard: MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32, MST9883CR
Tuner: BN40-00051A
Specifications LE32R51B
SAMSUNG LE32R51B
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE32R51B does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In such cases, the fault should be sought first in the BN41-00522B power supply module. It is necessary to measure the secondary output voltages, and if they are absent, check the operability of the power switches of the converters and rectifier diodes for a short circuit probability.
During thermal and avalanche breakdowns of semiconductors in secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- 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.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. 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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-00545D motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, you should update or replace the software (software). Board repair and chip replacement MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32, MST9883CR are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before changing the tuner BN40-00051A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair a SAMSUNG LE32R51B TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
SCHEMATICS ---> Samsung LE23R51B, LE26R51B, LE32R51B, LE40R51B Chassis RE23EO, RE26EO, RE32EO, RE40EO.
The appearance of the MainBoard BN41-00545D is shown in the figure below:BN41-00545D
BN41-00545D can be used in TVs:
SAMSUNG LE32R51 LE32R51BM S (Panel LTA320W2-L14), SAMSUNG LE32R51B (Panel LTA320W2-L01), SAMSUNG LE26R51B LE26R51BM (Panel LTA260W2-L11), SAMSUNG LE40R51B LE40R51BX (SAMSUNG LE40 LB2011BG01LB201LB201LB2301 Panel LTA2G01 LE37R41B (Panel 1366x768 720p HD (LQ370T3LZ41 / LQ370T3LZ44)).
The appearance of the power supply
Main features of the SAMSUNG LE32R51B device:
Installed matrix (LCD panel) LTA320W2-L01.
To power the backlight used inverter KLS-320VE-J.
The necessary supply voltages for all nodes of the SAMSUNG LE32R51B TV are generated by the BN41-00522B power module or its analogs using VIPER12A, ICE1PCS02, STR-W6755 microcircuits and 18N50 type power switches.
MainBoard - the main board (motherboard) is a module BN41-00545D, using microcircuits MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32, MST9883CR and others.
The tuner BN40-00051A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320W2-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 44%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 16/8 (Tr / Td)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V