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.

How to use the site:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday 22 April 2020

REPAIR / SERVICING TV SHIVAKI 49-9000

Technical description and composition of the SHIVAKI 49-9000 TV, type of panel and applicable modules. The composition of the modules.
SHIVAKI LED
Model: 49-9000
Chassis / Version: CV512H-A50
Panel: LC490DUY-SHA2
LED driver (backlight): integrated into MainBoard
PWM LED driver: LD5530
MOSFET LED driver: 7N65
Power Supply (PSU): integrated into MainBoard
PWM Power: L6562, LD5530
MOSFET Power: 13N50, 7N65
MainBoard: CV512H-A50
IC MainBoard: SPI FLASH: 25Q64, AUDIO: TPA3110LD2, AS358M
Tuner: CDT-9NT372-RF01
Appearance
SHIVAKI 49-9000
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SHIVAKI 49-9000 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
First of all, in such cases, you should verify the operability of the common switching power supply (IIP) - AC / DC voltage converter of the mains voltage. All source elements in this TV model are located on the MainBoard CV512H-A50 main board. It is necessary to measure its output voltages and, if they are absent, check the power switches (13N50, 7N65) and rectifier diodes for the probability of short circuit in the converters.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the main fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) L6562, LD5530, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
The faulty usually in these cases is the backlight matrix (LED-panel). The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the CV512H-A50 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - SPI FLASH: 25Q64, AUDIO: TPA3110LD2, AS358M. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The malfunction of the tuner CDT-9NT372-RF01 is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.

 FIRMWARE FOR SPI FLASH  ----------->   SHIVAKI 49-9000, Main: CV512H-A50, Panel: LC490DUY-SHA2

 The appearance of the MainBoard CV512H-A50 is shown in the figure below:
CV512H-A50
Main features of the SHIVAKI 49-9000 device:
Installed matrix (LED-panel) LC490DUY-SHA2.
To power the backlight LEDs, a converter is used, combined with the main board CV512H-A50, controlled by the LD5530 PWM controller. As power elements of the LED driver, keys of the 7N65 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using L6562, LD5530 microcircuits and 13N50, 7N65 type power switches.
MainBoard - the main board (motherboard) is a CV512H-A50 module, using microchips SPI FLASH: 25Q64, AUDIO: TPA3110LD2, AS358M and others.
The tuner CDT-9NT372-RF01 provides the reception of television programs and tuning to channels.
Posted By: FRANK at 07:31
TAG: , , , ,