Technical description and composition of the TV SONY KDL-22BX20D, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-22BX20D
Chassis / Version: AZ1-BK (5-3D)
Panel: LTA216AT01
Inverter (backlight): VYA194G-06 // VY194G-07
PWM Inverter: FAN7314 (20)
MOSFET Inverter: FDD8778 1A13AC /. FDD4141 1A20AS
Trans Inverter: TMS204819 T // TSM95026CT
Power Supply (PSU): VYA194G-06 // VY194G-07
PWM Power: PWM SOT23-6 (1A15AS), CM0465R
MainBoard: VYA190G-3 V.0 HYF MZZ
IC MainBoard: MAX9706B, MSB1210-LF, ST1S10, DVD YLP120G-4 SW Ver V57
Tuner: HYB 9ZZ
Control: RM-ED038
Technical Specifications KDL-22BX20D
SONY KDL-22BX20D
General recommendations for repairing TV LCD
TV SONY KDL-22BX20D, like any other, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the SONY KDL-22BX20D TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the VYA194G-06 general power supply module // VY194G-07. When diagnosing and repairing the VYA194G-06 // VY194G-07 power supply, first of all, it is necessary to check the fuse, and if it breaks, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the 1A15AS PWM controller chip (6) (AN7514). CMO465R, which can only be checked by replacing with a new or obviously working one.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
Sometimes the SONY KDL-22BX20D TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Diagnostics of the VYA194G-06 // VY194G-07 inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
In the event of a malfunction on the HRJ MZZ motherboard, first of all, check the operability of all power supply stabilizers for the microcircuits and, if necessary, update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MB (SSB) card - MAX9706B. MSB1210-LF. ST1S10 DVD YLP120G-4 SW Ver V57 120X.
Remember! Attempts to self-repair by users of the SONY KDL-22BX20D TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual / schematic diagram -------------> Sony KDL-22BX20D CHASSIS AZ1-BK(5-3D)
The appearance of the MainBoard VYA190G-3 is shown in the figure below:VYA190G-3
VYA190G-3 can be used in TVs:
SONY KDL-19BX200 (Panel M185XW01 V0), SONY KDL-22BX20D (Panel LTA216AT01).
The appearance of the power supply
Main features of the device SONY KDL-22BX20D:
Installed matrix (LCD-panel) LTA216AT01.
The VYA194G-06 inverter is used to power the backlight lamps; it is controlled by the FAN7314 PWM controller (20). The transformer TMS204819 T // TSM95026CT is installed in the inverter converter. As power elements of the inverter, keys of the type FDD8778 1A13AC / are used. FDD4141 1A20AS.
The necessary supply voltages for all nodes of the SONY KDL-22BX20D TV are generated by the VYA194G-06 power module or its analogs using PWM SOT23-6 (1A15AS), CM0465R microcircuits.
MainBoard - the main board (motherboard) is a VYA190G-3 module using MAX9706B, MSB1210-LF, ST1S10, DVD YLP120G-4 SW Ver V57 and others.
The HYB 9ZZ tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA216AT01
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 477.417x268.416 mm
Surface: Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
