Technical description and composition of the SONY KDL-40R553C TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-40R553C
Chassis / Version: BE board
Panel: NS5S400VND01
LED driver (backlight): with integrated MainBoard
Power Supply (PSU): ACDP-060S02 Adapter 19V 3.05A
MainBoard: 1-894-095-11 - 173534211 BE
IC MainBoard: MT5565
Tuner: DE241ZP
Technical Specifications KDL-40R553C
SONY KDL-40R553C
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SONY KDL-40R553C TV does not turn on, does not show any signs of turning on. The control buttons and the remote control does not respond.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module - Adapter ACDP-060S02.
The external ACDP-060S02 Adapter 19V 3.05A power supply is not always subject to repair due to inexpediency, moreover, the owner can purchase it on his own. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources (IIP). Then you should measure its output voltage 19V, and in the absence of it is necessary to check the serviceability of the power switches of the converter and rectifier diodes for the probability of short circuit.
It should be remembered that in case of breakdowns of semiconductors in secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key can be PWM (PWM), which is usually checked by replacing a known-good one.
- 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.
As a rule, in such cases there is no display backlight. 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 open circuit 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 failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 1-894-095-11 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements of the MT5565. BGA chip malfunctions are usually easy to detect by warming up.
Before changing the tuner DE241ZP, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the SONY KDL-40R553C TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
The appearance of MainBoard 1-894-095-11 is shown in the figure below:
1-894-095-11
The appearance of the power supply
Main features of the device SONY KDL-40R553C:
Installed matrix (LED panel) NS5S400VND01.
To power the backlight LEDs, a converter is used, combined with the main board 1-894-095-11.
To power all the internal components of the SONY KDL-40R553C TV, an external source such as ACDP-060S02 Adapter 19V 3.05A is used.
MainBoard - the main board (motherboard) is a module 1-894-095-11, using MT5565 chips and others.
The tuner DE241ZP provides reception of television programs and tuning to channels.