Technical description and composition of the SONY KDL-32EX421 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32EX421
Chassis / Version: AZ2W_P-1
Panel: LTY320AN02 // V315B5-LE2
T-CON: LJ9403859G 185795012 //
LED driver (backlight): GE2A FX0022912
Power Supply (PSU): APS-288 (CH) 1-883-824-13
PWM Power: STR-Y6765, A3810M, J0319 RRH090, AS324
MOSFET Power: K5A50D, K15A50D
MainBoard: 1-883-753-32 BAT-V32
IC MainBoard: CXD4727GB, K4B2G1646C-HCH9, KFM2GN6Q2B, Y164B, NJU72040, Sil9287BCNU, GL850G
Tuner: CXD2825GA
Control: RM-ED045 FX0000211
Technical Specifications KDL-32EX421
SONY KDL-32EX421
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs SONY KDL-32EX421, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. Visible damage to the elements can sometimes indicate the direction of the search for the defect even before the necessary measurements. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
In cases when the SONY KDL-32EX421 TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up and do not blink, and there are no sounds and no signs of operability at all, the GE2A FX0022912 power supply module is most likely faulty or there is no processor power on the motherboard (a typical defect of some models of SONY TVs). First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the SONY KDL-32EX421 does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the backlight circuits of the LTY320AN02 // V315B5-LE2 panel is likely. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
Repair or diagnostics of the BAT-V32 motherboard should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
We recommend the owners of the KDL-32EX421 TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual / schematic diagram -------------------> Sony KDL-32EX421/423, KDL-32EX520/521/523, KDL-40EX520/521/523, KDL-46EX520/521/523 CHASSIS AZ2-F
The appearance of MainBoard 1-883-753-32 is shown in the figure below:
1-883-753-32
1-883-753-32 can be used in TVs:
SONY KDL-32CX520 (Panel V315H3-L01), SONY KDL-32EX421 (Panel LTY320AN02), SONY KDL-32EX720 (Panel LTY320HJ01), SONY KDL-40EX521 (Panel LTY400HM08 001), SONY KDL-46EX720 (Panel LTY460HJ05 3D), SONY KDL-46CX520 (Panel LTY460HN01), SONY KDL-40CX521 (Panel LTY400HM07).
The appearance of the power supply
Main features of the device SONY KDL-32EX421:
Installed matrix (LED-panel) LTY320AN02 or V315B5-LE2.
The matrix control uses the Timing Controller (T-CON) LJ9403859G.
To power the backlight LEDs, the GE2A LED driver is used.
The necessary supply voltages for all nodes of the SONY KDL-32EX421 TV are generated by the APS-288 power module or its analogs using the STR-Y6765, A3810M, J0319 RRH090, AS324 microcircuits and power switches of the K5A50D, K15A50D type.
MainBoard - the main board (motherboard) is a module 1-883-753-32, using microcircuits CXD4727GB, K4B2G1646C-HCH9, KFM2GN6Q2B, Y164B, NJU72040, Sil9287BCNU, GL850G and others.
The CXD2825GA tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTY320AN02
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 5.5%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/8 (Tr / Td); 20 (G to G)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
