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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Thursday, 5 March 2020

REPAIR / SERVICING TV SONY KDL-22EX320

Technical description and composition of the SONY KDL-22EX320 TV, panel type and applicable modules. The composition of the modules.
SONY LED
Model: KDL-22EX320
Chassis / Version: AZ2W
Panel: L216SDA2 // LC216EXN
LED driver (backlight): integrated into PSU
Power Supply (PSU): PSC10343E M (147428311-00012761)
PWM Power: SSC1D310, SI-8205NHD
MOSFET Power: STP10NK80ZFP
MainBoard: A-1798-605-A 1-883-778-11 (173239611) BAT S
IC MainBoard: CXD4727GB, K4B2G1646C
Tuner: Y2009870C
Technical Specifications KDL-22EX320
SONY KDL-22EX320
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-22EX320 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
In some of these cases, the main switching power supply, the PSC10343E module, is faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (STP10NK80ZFP) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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 an excess of the maximum current or voltage. 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) SSC1D310, SI-8205NHD, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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.

- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the A-1798-605-A 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CXD4727GB, K4B2G1646C with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect a malfunction of the Y2009870C tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
We recommend the owners of the KDL-22EX320 TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual / schematic diagram ------------->   SONY KDL-22EX320 , KDL-22EX325, KDL-24EX320, KDL-24EX325, KDL-26EX320, KDL-26EX321, KDL-26EX325, KDL-32EX421, KDL-32EX425, KDL-32EX523, KDL-32EX524, KDL-32EX525, KDL-37EX521, KDL-37EX524, KDL-37EX525, KDL-40EX520, KDL-40EX521, KDL-40EX523, KDL-40EX524, KDL-40EX525, KDL-46EX520, KDL-46EX521, KDL-46EX524, KDL-46EX525 Chassis AZ2W


 The appearance of MainBoard A-1798-605-A is shown in the figure below:
A-1798-605-A
The appearance of the power supply
Main features of the device SONY KDL-22EX320:
Installed matrix (LED-panel) L216SDA2 or LC216EXN.
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-22EX320 TV are generated by the PSC10343E power module or its analogs using SSC1D310, SI-8205NHD microcircuits and power switches of the STP10NK80ZFP type.
MainBoard - the main board (motherboard) is an A-1798-605-A module, using CXD4727GB, K4B2G1646C microcircuits, and others.
The Y2009870C tuner provides TV reception and channel tuning.
Posted By: FRANK at 08:02
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