Technical description and composition of the SAMSUNG QE55Q7CAM TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: QE55Q7CAM
Panel: CY-XM055FLLV2V
LED backlight: QLED Edge LED
T-CON: integrated into MainBoard
LED driver (backlight): BN44-00902A L65E8NC_MSM PSLF151E09C
Power Supply (PSU): BN44-00900A L55E8NA_MHS
MainBoard: BN41-02572A BN94-11487A
IC MainBoard: DC / DC: VPM1RT, DAC: BURR BROWN 88002, AUDIO: TAS5747
Tuner: SOC1000M BN95-03853A
Control: WIFI: WCM730Q BN59-01264A
Technical Specifications QE55Q7CAM
SAMSUNG QE55Q7CAM
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG QE55Q7CAM TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the malfunction should be sought first in the BN44-00900A power supply module. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
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, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, a malfunction is caused by a lack of display backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts is required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator signals standby or working mode, or blinks.
Repair or diagnostics of the BN41-02572A 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).
If you suspect a malfunction of the SOC1000M BN95-03853A tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
We recommend the owners of the QE55Q7CAM 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!
BN41-02572A
The appearance of the power supply
Main features of the SAMSUNG QE55Q7CAM device:
Installed matrix (LED panel) CY-XM055FLLV2V.
The matrix control uses the Timing Controller (T-CON) integrated.
The LED driver BN44-00902A is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the SAMSUNG QE55Q7CAM TV is carried out by the BN44-00900A power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02572A module, using DC / DC chips: VPM1RT, DAC: BURR BROWN 88002, AUDIO: TAS5747 and others.
Tuner SOC1000M BN95-03853A provides the reception of television programs and tuning to channels.