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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Monday 13 April 2020

REPAIR / SERVICING TV ERISSON 28LEC2300

 Technical description and composition of the ERISSON 28LEC2300 TV, type of panel and applied modules. The composition of the modules.
ERISSON
Model: 28LEC2300
Chassis / Version: JUC7.820.00098892
Panel: 720p HD, 1366x768
MainBoard: JUC7.820.00098892
IC MainBoard: SPI Flash: 25q64bsig;
Technical Specifications 28LEC2300
ERISSON 28LEC2300
General recommendations for repairing TV LCD
Repair of all electronic devices, including the ERISSON TV, made on the basis of the JUC7.820.00098892 chassis, it is advisable to start with an external examination of its external and internal elements. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before the necessary measurements are taken. 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.
Malfunctions of the power module can be expressed in different ways, for example, ERISSON 28LEC2300 does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the ERISSON 28LEC2300 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU. It is necessary to take into account that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Diagnostics and repair of the JUC7.820.00098892 motherboard is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required. If it is not possible to replace the MB board (SSB), you need to check the health of its elements - SPI Flash: 25q64bsig; . Defective components should be replaced.
Attention! For users and owners of 28LEC2300 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH  ----------->   ERISSON 28LEC2300 , Main: JUC7.820.00098892, Panel: 720p HD, 1366x768
 The appearance of the MainBoard JUC7.820.00098892 is shown in the figure below:
JUC7.820.00098892
JUC7.820.00098892 can be used in TVs:
BBK 32LEM-1003/T2C (Panel LC320EXN), BBK 28LEM-1003/T2C (Panel M280X13-E4-H), ERISSON 28LEC2300 (Panel 720p HD 1366x768).
Main features of the ERISSON 28LEC2300 device:
Installed matrix (LCD panel) 720p HD, 1366x768.
The required supply voltage for all nodes of the TV ERISSON 28LEC2300 provides a switching power supply.
MainBoard - the main board (motherboard) is a JUC7.820.00098892 module, using SPI Flash chips: 25q64bsig; and others.
Posted By: FRANK at 07:10
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