Technical description and composition of the SAMSUNG LA37R81B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LA37R81B
Chassis / Version: GBP37SEN
Panel: T370XW01 V1
T-CON: T370Xw01 V1 CTRL BD
Power Supply (PSU): AF235B00030
MainBoard: TM9E19 V25
IC MainBoard: 24C04, 24C32, EN25F40, TDA7266SA
Tuner: TNF9318BFDR1
Appearance
SAMSUNG LA37R81B
General repair guidelines for TV LCD
Repair of the SAMSUNG LA37R81B TV should begin with a careful external inspection and diagnosis of the malfunction. In this case, it is advisable to carefully examine both internal and external components. Often, based on certain external signs, it is possible to draw some conclusions about the reasons for the failure of certain circuit elements even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters deformed after boiling, cracked soldering on the terminals of the elements can often tell the cause of the defect and possible consequences.
In cases where the SAMSUNG LA37R81B TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up and do not blink, and there are no sounds and no signs of operability at all, the AF235B00030 power supply module is most likely faulty or, what happens much less often - there is no processor power on the motherboard. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
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 PWM controller chip or breakage of the resistors in its bundle.
If an active Power Factor Corrector (CMC) is used in the power module circuitry, it can sometimes become more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
Sometimes the SAMSUNG LA37R81B 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 electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
When repairing the inverter, it is often necessary for diagnostics to turn off the protection, 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.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
If the motherboard TM9E19 V25 is faulty in which the TNF9318BFDR1 tuner is installed, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. Complex repair of the MB board (SSB) in some cases is possible and practiced by service repairmen. To do this, check and, if necessary, replace the elements 24C04, 24C32, EN25F40, TDA7266SA.
Remember! Attempts to self-repair by users of the SAMSUNG LA37R81B TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Main features of the SAMSUNG LA37R81B device:Installed matrix (LCD-panel) T370XW01 V1.
The matrix control uses the Timing Controller (T-CON) T370Xw01.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LA37R81B TV is carried out by the AF235B00030 power module, or its analogues.
MainBoard - the main board (motherboard) is a TM9E19 module, using 24C04, 24C32, EN25F40, TDA7266SA, and others.
The TNF9318BFDR1 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T370XW01 V1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 15/5 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V