Technical description and composition of the TV SONY KDL-42W817B, type of panel and applicable modules. The composition of the modules.SONY LED
Model: KDL-42W817B
Chassis / Version: RB2G
Panel: T420HVJ02.1
LED backlight: Edge LED 74.42T35.OO1-0-DX1
T-CON: 42T34-C00 T420HVN06.2
LED driver (backlight): 14STM4250AD-6S01 REV.1.0
PWM LED driver: BD9422EF
MOSFET LED driver: SBR10150CT, TPC8127
Power Supply (PSU): ACDP-120E02 Adapter 19.5V 6.2A
MainBoard: 1-889-202-22 (173457422) BAX L
IC MainBoard: CPU: X-Reality PRO CXD4748GB, H5TQ4G83AFR, Nand: TC58NVG3SOFTAIO
Tuner: 1-889-203-13 (173457513)
Control: Wi-fi: J20H076, J20H077, 1-889-245-11 (173459911)
Technical Specifications KDL-42W817B
SONY KDL-42W817B
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SONY KDL-42W817B TV does not turn on, does not respond to the buttons on the control panel and the remote control, the indicators do not light or flash.
With similar manifestations, the ACDP-120E02 power module may be faulty.
The owner of a TV can purchase an external power supply unit such as ACDP-120E02 and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. It is necessary to measure the secondary output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
During thermal or avalanche 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.
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 an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is usually checked by replacing with a known good or new one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 1-889-202-22 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). When repairing an MB board, you need to check its CPU components: X-Reality PRO CXD4748GB, H5TQ4G83AFR, Nand: TC58NVG3SOFTAIO. 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.
Before changing the tuner 1-889-203-13 (173457513), if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that 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
TV users and owners need to remember that attempts to self-repair a SONY KDL-42W817B TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual / Schematic Diagram --------------> Sony Service Procedure for Panel, Board and Software Change RB2G
The appearance of MainBoard 1-889-202-22 is shown in the figure below:1-889-202-22
1-889-202-22 can be used in TVs:
SONY KDL-42W817B (Panel T420HVJ02.1), SONY KDL-42W706B KDL-42W706W (Panel T420HVF06.1), SONY KDL-40W605B (Panel NS4S400DND01 4-528-221-02), SONY KDL-42W705B (Panel T420HVF06.0 xxxxG), SONY KDL-50W817B (Panel T500HVF04.1), SONY KDL-42W828B (Panel T420HVJ02.0), SONY KDL-48W605B (Panel LSY480HN01-001), SONY KDL-32W706B (Panel T320HVF04.1 ).
The appearance of the power supply
Main features of the device SONY KDL-42W817B:
Installed matrix (LED panel) T420HVJ02.1.
The matrix control uses the Timing Controller (T-CON) 42T34-C00.
The LED driver 14STM4250AD-6S01 is used to power the backlight LEDs, it is controlled by the BD9422EF PWM controller. As power elements of the LED driver, keys of the type SBR10150CT, TPC8127 are used.
To power all the internal components of the SONY KDL-42W817B TV, an external source such as ACDP-120E02 Adapter 19.5V 6.2A is used.
MainBoard - the main board (motherboard) is a 1-889-202-22 module, using CPU chips: X-Reality PRO CXD4748GB, H5TQ4G83AFR, Nand: TC58NVG3SOFTAIO and others.
The tuner 1-889-203-13 (173457513) provides the reception of television programs and tuning to channels.