Technical description and composition of the SAMSUNG LE32M71B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32M71B
Panel: T315XV02 V.8
T-CON: T315XV02 V6; AUO-024, M13S, 128324A-5B, 24C64, AS15-F, BD8156EFV
Inverter (backlight): 4H.V1448.291 / B1
PWM Inverter: OZ964SN, 78L05
MOSFET Inverter: P2804BDG
Power Supply (PSU): BN96-03057B
PWM Power: F9222L, TDA4863-2 (PFC), VIPer22A
MOSFET Power: W20NM60
MainBoard: BN41-00733C MP2.1
IC MainBoard: S29AL008D70TF102, 3F866BXZZQZ8B, 24C32, EM6A9160TS-5G, TEA6422
Tuner: BN40-00078A TSLW3001PD32S (H)
Technical Specifications LE32M71B
SAMSUNG LE32M71B
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE32M71B 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.
Most likely, in this case, the main switching power supply (IPS) BN96-03057B will be faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches (W20NM60) of the converters and rectifier diodes for a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or a current sensor at the source of the key usually breaks.
First of all, it is necessary to check the operability of the standby converter made on the VIPer22A PWM controller.
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. These can be elements supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) stabilization.
PWM controllers (PWM) F9222L, TDA4863-2 (PFC), VIPer22A are checked by replacing with obviously working ones.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned 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 BN41-00733C 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - S29AL008D70TF102, 3F866BXZZQZ8B, 24C32, EM6A9160TS-5G, TEA6422 which may require replacement with new ones. If the BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner BN40-00078A TSLW3001PD32S (H), if it is not possible to tune to television channels, 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
Attention to users! Self-repair of a SAMSUNG LE32M71B TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
One of the typical defects of a SAMSUNG LE32M71B TV can occur in the T315XV02 V.8 panel.
External manifestations: color distortion in the image as a negative in the image, light tones predominate. Usually in such cases, the AS15-F gamma corrector is faulty. Another indicator of its malfunction is an excessively strong heating, which in practice allows you to do without measuring the voltage gradations of gray.
In most cases, replacing the AS15-F solves the problem.
It should be remembered that similar symptoms can cause faults in the column drivers of the panel, which is usually indicated by interference in the form of even vertical stripes on the screen. Then, after replacing the AS15-F, the situation does not change. Drivers are in loops and cannot be replaced. In this case, it is necessary to replace the glass panel.
Composition of MB BN41-00733C - S29AL008D70TF102 sticker (T-MSLMPEU-2013 8.5.2007 4822 (E)), 3F866BXZZQZ8B sticker (T-MOSLM PEUS (B) 8.5.2007 1000 1P47), 24C32, EM6A9160TS-5G, EM6A93GBI BA7657F, P13HDMI412FTBE, LCX245, QS3125S1G, MAX232EC, PCM1754, SDP54 (DNIe), STV8257DSX, STA323W, LCX245, TEA6422.
The appearance of the MainBoard BN41-02152B is shown in the figure below:BN41-02152B
BN41-02152B can be used in TVs:
SAMSUNG T27D390EX (Panel CY-MH270BGLVBV), SAMSUNG T27D390 (Panel CY-MH270BGLV4H).
PSU Advanced
The BN96-03057B power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on a TDA4863-2 PWM controller that 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.
Main features of the SAMSUNG LE32M71B device:
Installed matrix (LCD panel) T315XV02 V.8.
The matrix control uses the Timing Controller (T-CON) T315XV02.
To power the backlight, an inverter 4H.V1448.291 is used, it is controlled by the PWM controller OZ964SN, 78L05. As power elements of the inverter, keys of the type P2804BDG are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32M71B TV are generated by the BN96-03057B power module or its analogs using F9222L, TDA4863-2 (PFC), VIPer22A microcircuits and W20NM60 type power switches.
MainBoard - the main board (motherboard) is a BN41-00733C module, using chips S29AL008D70TF102, 3F866BXZZZZZB, 24C32, EM6A9160TS-5G, TEA6422 and others.
The tuner BN40-00078A TSLW3001PD32S (H) provides the reception of television programs and tuning to channels.
Information from an alternative source:
SAMSUNG LE32M71B
Panel Type (Matrix): T315XV02 V.8
Motherboard: BN41-00733C MP2.1, S29AL008D70TF102 sticker (T-MSLMPEU-2013 8.5.2007 4822 (E)), 3F866BXZZQZ8B sticker (T-MOSLM PEUS (B) 8.5.2007 1000 1P47), 24C32, M32C, EM6A9160TS- 5G, EM6A9320BI-5MG, BA7657F, P13HDMI412FTBE, LCX245, QS3125S1G, MAX232EC, PCM1754, SDP54 (DNIe), STV8257DSX, STA323W, LCX245, TEA6422, Tuner: TSLW3001)
T-con: T315XV02 V6, AUO-024, M13S128324A-5B, 24C64, AS15-F, BD8156EFV
Invertor: DARFON 4H.V1448.291 / B1, OZ964SN, EZ7A619, CD4066BCM, P5504BDG X4, P2804BDG X4, 78L05
PSU: BN96-03057B, F9222L, TDA4863-2, VIPer22A, W20NM60