Technical description and composition of the SAMSUNG LE32S71BX TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32S71BX LE32S71B
Chassis / Version: GSM32SE
Panel: CLAA320WB02
T-CON: CPT320WB02C
Inverter (backlight): CPT320WB02S 4H.V1448.451 / C1 V144-J04N
PWM Inverter: MSC16921PW 0547AH, LM324, LM393, LM358
Trans Inverter: 4002P626 800 (GP)
Power Supply (PSU): BN96-03775A // BN96-03832A
PWM Power: VIPer22A (Standby), F9222L (PWM resonant), TDA4863G (PFC), GKIA378R12PI, MC33167T
MOSFET Power: STP20NM60
MainBoard: BN41-00758A
IC MainBoard: MT8202EG, 24C32WP, 74HC4052D, 9933B, A21SC, A81SC, AP358, MAX232ECW, MP1583DN
Tuner: BN40-00079A
Technical Specifications LE32S71B
SAMSUNG LE32S71BX
General repair guidelines for TV LCD
It is advisable to start any repair and diagnostics of the SAMSUNG LE32S71BX TV with a careful external examination of internal and external elements, including case parts, a display, buttons, and cables. 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.
Sometimes the SAMSUNG LE32S71BX TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the BN96-03775A common power module. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of a break, the cause should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the F9222L / 4863G converter, which can be installed separately on the radiator, or integrated with a PWM controller.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the VIPer22A / KIA378R12PI, MC33167T PWM controller chip or breakage of the resistors in its bundle.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation.
If the SAMSUNG LE32S71BX does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
When repairing the CPT320WB02S 4H.V1448.451 / C1 V144-J04N inverter, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
It should be remembered that when the protection is turned off, there is always a risk of failure of the inverter power elements during diagnosis. After repair, it is imperative to restore all standard converter protection circuits.
The motherboard BN41-06758A 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. Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MT8202EG, 24C32WP, 74HC4052D, 9933B, A21SC, A81SC, AP358, MAX232ECW, MP1583DN and replace the failed chips with new ones.
Owners and users of the SAMSUNG LE32S71BX 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!
SCHEMATICS ------> Samsung LE27S71B, LE32S71B, LE37S71B, LE40S71B Chassis GSM27SE - GSM40SE.
PSU SCHEMATIC ----> BN96-03775A.
The main view of MainBoard BN41-00758A is shown in the figure below:BN41-00758A
BN41-00758A can be used in TVs:
SAMSUNG LE32S71BX (Panel CLAA320WB02), SAMSUNG LE37R72BX (Panel CLAA370WA03S), SAMSUNG LE40S71B (Panel LTA400WT-L01).
PSU Advanced
The LE32S71BX model uses a BN96-03775A 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 4863 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter 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 LE32S71BX device:
Installed matrix (LCD-panel) CLAA320WB02.
The matrix control uses the Timing Controller (T-CON) CPT320WB02C.
To power the backlight, the inverter CPT320WB02S is used, it is controlled by the PWM controller MSC16921PW 0547AH, LM324, LM393, LM358. A transformer 4002P626 800 (GP) is installed in the inverter converter.
The necessary supply voltages for all nodes of the SAMSUNG LE32S71BX TV are generated by the BN96-03775A power supply module or its analogs using VIPer22A (Standby), F9222L (PWM resonant), TDA4863G (PFC), GKIA378R12PI, MC33167T microcircuits and power switches of the STP20M type.
MainBoard - the main board (motherboard) is a BN41-00758A module, using chips MT8202EG, 24C32WP, 74HC4052D, 9933B, A21SC, A81SC, AP358, MAX232ECW, MP1583DN and others.
The tuner BN40-00079A provides the reception of television programs and tuning to channels.
Information from an alternative source:
Samsung LE32S71BX chassis GSM32SE / Samsung LE27S71 chassis GSM27SE, LE37S71 chassis GSM37SE, LE40S71 chassis GSM40SE
Additional technical information about the panel:
Brand: CPT
Model: CLAA320WB02
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 10/6 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V