Technical description and composition of the SAMSUNG QE65Q8CAM TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: QE65Q8CAM
Panel: CY-XM065FLLV1H
LED backlight: QLED Edge LED
T-CON: integrated into MainBoard
LED driver (backlight): BN44-00902A L65E8NC_MSM PSLF151E09C
Power Supply (PSU): BN44-00901A L65E8NA_MHS
MainBoard: BN41-02572A BN94-11487C
IC MainBoard: DAC: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747
Tuner: SOC1000M BN91-19033N
Control: WIFI / BT: WCM730Q BN59-01264A
Technical Specifications QE65Q8CAM
SAMSUNG QE65Q8CAM
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG QE65Q8CAM TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
In some of these cases, a fault is detected in the BN44-00901 power 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 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 main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Failure in most such cases is detected in the nodes and backlight elements of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Usually, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
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). In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - DAC: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747 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 SOC1000M BN91-19033N tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to self-repair a TV SAMSUNG QE65Q8CAM, 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!
The appearance of the MainBoard BN41-02572A is shown in the figure below:
BN41-02572A
The appearance of the power supply
Main features of the SAMSUNG QE65Q8CAM device:
Installed matrix (LED panel) CY-XM065FLLV1H.
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 QE65Q8CAM TV is carried out by the BN44-00901A power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02572A module, using DAC chips: BURR BROWN 88002, DC / DC: VPM1RT, AUDIO: TAS5747 and others.
The tuner SOC1000M BN91-19033N provides the reception of television programs and tuning to channels.