Technical description and composition of the SONY KDL-32R503C TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32R503C
Panel: IS5S320VNG01
LED backlight: LM41-00113A
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): Adapter AC / DC 19.5V
MainBoard: 1-894-095-11 173534211 A2066786A
IC MainBoard: CPU: MT5565KQVG
Tuner: DE241ZP
Control: WIFI: J20H078
Technical Specifications KDL-32R503C
SONY KDL-32R503C
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-32R503C TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up and do not blink, the TV does not respond to the control buttons.
With such manifestations, the Adapter power module usually fails.
The owner of the TV can purchase the adapter AC / DC 19.5V external power supply independently, and it’s not always advisable to repair it, but sometimes it makes sense to open it and eliminate the simple defects typical of IPS. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the 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 parameters of the switch. 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 is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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 is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - MT5565. Defective components should be replaced.
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
Attention TV owners! Self-repair attempts by SONY KDL-32R503C are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of MainBoard 1-894-095-11 is shown in the figure below:1-894-095-11
Main features of the device SONY KDL-32R503C:
Installed matrix (LED panel) IS5S320VNG01.
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-32R503C TV, an external adapter type AC / DC 19.5V is used.
MainBoard - the main board (motherboard) is a module 1-894-095-11, using CPU chips: MT5565KQVG and others.
The tuner DE241ZP provides reception of television programs and tuning to channels.