Technical description and composition of the SAMSUNG LE37A656A1 TV, type of panel and applicable modules. The composition of the modules.SAMSUNG
Model: LE37A656A1 LE37A656A1FXRU
Chassis / Version: N46A
Panel: T370HW02 V6
T-CON: 37T04-C03, T370HW02 V6 CTRL BD
Inverter (backlight): VIT71037.50 LOGAH REV: 1
PWM Inverter: OZ964SN
MOSFET Inverter: APM4052D
Trans Inverter: T51.0194.211
Power Supply (PSU): BN44-00216A
PWM Power: MC33067P (PWM), FAN7530 (PFC), FSQ0365RN (Standby)
MOSFET Power: 17N60 (PFC), 9N50 (PWM)
MainBoard: BN41-00974B BN94-01741H + BN4100944A
IC MainBoard: MT8226, MT8291E, NTP-3100, WT61P8, SDP72, D61211GM, HYB25DC256163CE-4, K4T56163QT, TMDS351, DNOS403SH071A
Tuner: BN40-00120A
Control: Remote: BN59-00676A, IR: BN41-00996A
Technical Specifications LE37A656A1F
SAMSUNG LE37A656A1
General repair guidelines for TV LCD
It is advisable to start the diagnostics of a malfunction of the SAMSUNG LE37A656A1 TV, as well as all others, with an external examination of both external and internal elements. Sometimes, for some visible changes, you can determine the further direction of the defect search and localization of the malfunction before the start of taking the oscillograms and making the necessary measurements at the control points. 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 solders will help the master to guess the causes and possible consequences of the malfunction.
If the SAMSUNG LE37A656A1 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a fault in the BN4400216A power module. When diagnosing and repairing the BN4400216A power supply, first of all, it is necessary to check the fuse, and if it breaks, you should check the power switch and rectifier bridge diodes for avalanche (thermal) breakdown.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail for no reason, which should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as others semiconductor elements (diodes, transistors, zener diodes).
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter of the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or during depressurization of lamps. This protection makes it difficult to diagnose and repair the inverter.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
On the BN9401741H motherboard, in case of a malfunction, you should first check the operation of all power supply stabilizers for the microcircuits and, if necessary, update the software (software).
It should be remembered! Attempts to repair the TV SAMSUNG LE37A656A1, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATICS -----> Samsung LE32A65*A, LE37A65*A, LE40A65*A, LE46A65*A, LE52A65*A, LE37A616A, LE40A616A Chassis N46A.
PSU SCHEMATICS:-----------> BN44-00216A.
The appearance of the MainBoard BN41-00974B is shown in the figure below:
BN41-00974B
BN41-00974B can be used in TVs:
SAMSUNG LE32A556P1 LE32A556P1F (Panel LTF320HA01 A04), SAMSUNG LE37A552 LE37A552P3R (Panel T370HW02 V.4), SAMSUNG LE37A656A1 LE37A656A1FXRU (Panel T370HW02 V6), SAMSUNG LE32A558P3F (Panel LTF320HA01), SAMSUNG LE40A656A1F (Panel LTF400HC01 A02), SAMSUNG LE37A615A3F LE37A615 (Panel T370HW02 V.4), SAMSUNG LE40A556P1F (Panel V400H1-L03 REV C1), SAMSUNG LE40A558P3F LE40A558 (Panel LTF400HA03), SAMSUNG LE32A656A1F (Panel LTF320HA04).
PSU Advanced
The power module BN44-00216A is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on the FAN7530 PWM controller, which 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.
The appearance of the power supply
Main features of the SAMSUNG LE37A656A1 device:
Installed matrix (LCD panel) T370HW02 V6.
The matrix control uses the Timing Controller (T-CON) 37T04-C03.
The VIT71037.50 inverter is used to power the backlight lamps, it is controlled by the OZ964SN PWM controller. A transformer T51.0194.211 is installed in the inverter converter. As power elements of the inverter, keys of the APM4052D type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE37A656A1 TV are generated by the BN44-00216A power module or its analogs using microcircuits MC33067P (PWM), FAN7530 (PFC), FSQ0365RN (Standby) and power switches of the type 17N60 (PFC), 9N50 (PWM) .
MainBoard - the main board (motherboard) is a BN41-00974B module, using chips MT8226, MT8291E, NTP-3100, WT61P8, SDP72, D61211GM, HYB25DC256163CE-4, K4T56163QT, TMDS351, DNOS403SH071A.
The tuner BN40-00120A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T370HW02 V6
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 2500: 1
Display Colors: 1.07B (10-bit), CIE1931 72%
Response Time: 5.5 (G to G)
Frequency: 120Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V