REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Friday 6 March 2020

REPAIR / SERVICING TV SONY KDL-32EX521

Technical description and composition of the TV SONY KDL-32EX521, type of panel and applicable modules. The composition of the modules.
SONY LED
Model: KDL-32EX521
Chassis / Version: AZ2-F
Panel: LTY320HN01
LED backlight: S1G1-320SM0-R0 [10.09.08] 32inch-0D1E-42
LED driver (backlight): integrated into PSU
Power Supply (PSU): APS-288 (CH) 1-883-824-13 GE2A
PWM Power: STR-Y6765, A3810M, J0319 RRH090
MOSFET Power: K5A50D, K15A50D
MainBoard: 1-883-753-32 603N4049-01R
IC MainBoard: CXD4727GB, K4B2G1646C-HCH9, Gl850g (MN1GD07G21), KFM2GN6Q2B, SII9287BCNU PS54452, D95830, RTL8201ES
Tuner: CXD2825GA
Technical Specifications KDL-32EX521
SONY KDL-32EX521
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SONY KDL-32EX521 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Most likely, in this case, the main switching power supply (IIPS) APS-288 is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (K5A50D, K15A50D) and rectifier diodes of the converters for possible short circuit.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) STR-Y6765, A3810M, J0319 RRH090, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 1-883-753-32 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 components CXD4727GB, K4B2G1646C-HCH9, Gl850g (MN1GD07G21), KFM2GN6Q2B, SII9287BCNU PS54452, D95830, RTL8201ES. 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 replacing the CXD2825GA tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention to users! Self-repair of a SONY KDL-32EX521 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual / schematic diagram ------------------->   SONY KDL-32EX521 Chassis AZ2-F

 MODELS  KDL-32EX421, KDL-32EX423, KDL-32EX520, KDL-32EX520, KDL-32EX521, KDL-32EX521, KDL-32EX523, KDL-32EX523, KDL-40EX520, KDL-40EX520, KDL-40EX521, KDL-40EX521, KDL-40EX523, KDL-40EX523, KDL-46EX520, KDL-46EX520, KDL-46EX521, KDL-46EX521, KDL-46EX523, KDL-46EX523



 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-32EX521:
Installed matrix (LED panel) LTY320HN01.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SONY KDL-32EX521 TV are generated by the APS-288 power module or its analogs using STR-Y6765, A3810M, J0319 RRH090 microchips and power switches of the K5A50D, K15A50D type.
MainBoard - the main board (motherboard) is a module 1-883-753-32, using the CXD4727GB, K4B2G1646C-HCH9, Gl850g (MN1GD07G21), KFM2GN6Q2B, SII9287BCNU PS54452, D95830, and other RTL8201 chips.
The CXD2825GA tuner provides TV reception and channel tuning.
Posted By: FRANK at 06:06
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