SAMSUNG LED
Model: UE27D5000 UE27D5000NW
Chassis / Version: U57B
Panel: LTM270HT03
LED backlight: LTM270HT03-V02
T-CON: LTM270HT03S2LV0.4_HF
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00450A PD27A0_BDY
MainBoard: BN41-01602A BN94-05161C
IC MainBoard: CPU: SEMS20 + WT61P805, DRAM: K4B1G1646G-BCH9
Tuner: BN40-00196A
Technical Specifications UE27D5000
SAMSUNG UE27D5000
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE27D5000 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Most often, with such manifestations, the main power module BN44-00450A is found to be faulty. It is necessary to measure its output voltages and, if they are absent, to check the short circuit probability in the converters power switches and rectifier diodes.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible key parameters. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the break in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a malfunction, the zener diode PN junction will either be cut off or broken into short-circuit.
- 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 BN41-01602A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). When repairing an MB board, you need to check its CPU components: SEMS20 + WT61P805, DRAM: K4B1G1646G-BCH9. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If a tuner BN40-00196A is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
We recommend the owners of the UE27D5000 TV for repair only to qualified specialists with the necessary work experience! Attempts to repair it yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual SAMSUNG UE27D5000 Chassis U57B.
The rear view of the MainBoard BN41-01602A is shown in the figure below:
BN41-01602A
BN41-01602A can be used in TVs:
SAMSUNG UE19D4010NW UE19D4010 (Panel LTM185AT04), SAMSUNG UE22D5000NW UE22D5000 (Panel M215HW01).
Main features of the SAMSUNG UE27D5000 device:
Installed matrix (LED-panel) LTM270HT03.
The matrix control uses the Timing Controller (T-CON) LTM270HT03S2LV0.4_HF.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE27D5000 TV is carried out by the BN44-00450A power module, or its analogs.
MainBoard - the main board (motherboard) is a BN41-01602A module, using CPU chips: SEMS20 + WT61P805, DRAM: K4B1G1646G-BCH9 and others.
The tuner BN40-00196A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM270HT03
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 597.6x336.15 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 16S4P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
