Technical description and composition of the SAMSUNG LE32R81B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32R81B LE32R81W
Panel: LTF320AB01 // LTA320WT-L08
T-CON: 320AB02CP2L V03 LMX4122TO 24C64 320WTC2L V4.8 LMX4122TO
Inverter (backlight): SSI320A12 Rev0.6
PWM Inverter: OZ9966SN
MOSFET Inverter: 50N04
Trans Inverter: LT-32VE
Power Supply (PSU): BN44-00192A // BN44-00155A
PWM Power: MC33067P, TDA4863G (PFC), STR-A6159 (Standby)
MOSFET Power: FQPF5N50C, FCPF11N60 (PFC)
MainBoard: BN41-00839E
IC MainBoard: SVP UX68 7568U-LF 24C256 M308A0SGP; WT61P6S
Tuner: TCLWPD32S (H)
Control: Remote: BN59-00602A, IR: BN41-00848A
Specifications LE32R81B
SAMSUNG LE32R81B
General repair guidelines for TV LCD
Like any other TV, SAMSUNG LE32R81BX repair is advisable to start with a careful examination of the external and internal elements. It often happens that some damage to elements or connections will help determine the direction of troubleshooting and localization of the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in soldering will help the master to guess the causes and possible consequences of the malfunction.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, it does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the MK32P3, BN44-00192A power supply module is defective and needs repair. Sometimes with similar manifestations, a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch 5N50C, 11N60 for the possibility of an avalanche or thermal breakdown.
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 STR-A6159, MC33067P, MC33167T PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
Sometimes the SAMSUNG LE32R81BX TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter of the backlight lamps, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
In most cases, the diagnosis and repair of the VIT70043.50 REV0, I315B1-16A - C302G inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
In such cases, special care should be taken during diagnosis, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Repair of the motherboard BN94-01311F (BN41-00839E) must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - 7568U-LF, M308AOSGP, EM6A9320BI-4MG, NTP-3000, MAX232EC, 24C256BN, 74HC4052D, SIL9185CTU, Tuner: HTM2-6L2 / 235S. Defective components should be replaced.
Owners and users of the SAMSUNG LE32R81BX TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC PSU----> BN44-00192A/B
SCHEMATICS ----> 32R81BX Chassis GBP32SEN.
Samsung LE32R81W . Panel : LTA320WT L08; Main: BN41-00839E;
Power: BN44-00155A; Inverter: SSI320A12 (INV32512S)
The appearance of the MainBoard BN41-00839E is shown in the figure below:BN41-00839E
BN41-00839E can be used in TVs:
SAMSUNG LE32R81B LE32R81W (Panel LTF320AB01), SAMSUNG LE32R81BX (Panel V315B1-L01 Rev. C3), SAMSUNG LE37R82BX LE37R82B (Panel T370XW02 V6), SAMSUNG LE40R82BX (Panel LTA400WTLT. 081, LT40BTWT-L07 081, LT40BTL07
PSU Advanced
The LE32R81B model uses the BN44-00192A power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the TDA4863G PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the SAMSUNG LE32R81B device:
Installed matrix (LCD panel) LTF320AB01 or LTA320WT-L08.
The matrix control uses the Timing Controller (T-CON) 320AB02CP2L.
The SSI320A12 inverter is used to power the backlight, controlled by the OZ9966SN PWM controller. A transformer LT-32VE is installed in the inverter converter. As power elements of the inverter, keys of type 50N04 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32R81B TV are generated by the BN44-00192A power module or its analogs using MC33067P, TDA4863G (PFC), STR-A6159 (Standby) microcircuits and power switches of the type FQPF5N50C, FCPF11N60 (PFC).
MainBoard - the main board (motherboard) is a BN41-00839E module using SVP UX68 7568U-LF 24C256 M308A0SGP chips; WT61P6S and others.
The tuner TCLWPD32S (H) provides the reception of television programs and tuning to channels.
Information from an alternative source:
SAMSUNG LE32R81BX (BS) Chassis GBP32SEN
Panel Type (Matrix): V315B1-L01 Rev. C3
Motherboard: BN94-01311F (BN41-00839E), 7568U-LF, SDP64, M308AOSGP, EM6A9320BI-4MG, SGTV5810C, SIL9185CTU, NTP-3000, MAX232EC, 74HC4052D, 24C256BN, Tuner2 23M2
T-con: V315B-C01, CM2681A-KO, EM636165TS-7G (x2), AS15-G
Invertor: I315B1-16A - C302G, OZ964GN, BA2902F (x2), BD729P (x8), 4018L (x8)
PSU: BN44-00192A, STR-A6159, MC33067P, 5N50C (x2), 11N60, MC33167T
Remote control: BN59-00602A