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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Tuesday, 14 April 2020

REPAIR / SERVICING TV ERISSON 49LES70T2

Technical description and composition of the ERISSON 49LES70T2 TV, type of panel and applicable modules. The composition of the modules.
ERISSON LED
Model: 49LES70T2
Chassis / Version: 5800-A6M33G-0P10
Panel: LC490DUJ-SHA2
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9903GN
MOSFET LED driver: AOD4286
Power Supply (PSU): 168P-L5L017-W3 5800-L5L017-W300
PWM Power: TEA1733
MainBoard: 5800-A6M33G-0P10 VER00.00
IC MainBoard: SPI FLASH: 25Q64CS1G, AUDIO: TPA3110D2
Specifications 49LES70T2
ERISSON 49LES70T2
General repair guidelines for TV LCD LED
Possible manifestations of defects
- ERISSON 49LES70T2 does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the 5800-L5L017-W300 power supply is usually faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in secondary circuits, the converter can usually operate abnormally in short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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 (OOS) stabilization circuits. TEA1733 PWM controllers (PWMs), if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The most likely in these cases is a malfunction of the LED backlight. 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.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 5800-A6M33G-0P10 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - SPI FLASH: 25Q64CS1G, AUDIO: TPA3110D2 with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Attention! For users and owners of 49LES70T2 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-serviceability of the device.



Reduce the backlight current in televisions with power supplies 168P-L5L017-W3 (5800-L5L017-W300) as follows. The current sensors in each of the three channels consist of two 3.3 Ohm resistors connected in parallel at the source of the Q403-Q405 switches. You can reduce the backlight current by about 30% by replacing one of the 3.3 Ohm resistors with 10 Ohm in each channel.






The appearance of the MainBoard 5800-A6M33G-0P10 is shown in the figure below:
5800-A6M33G-0P10
5800-A6M33G-0P10 can be used in TVs:
ERISSON 49LES70T2 (Panel LC490DUJ-SHA2), TELEFUNKEN TF-LED43S27T2 (Panel LC430DUJ-SHA1 RDL430FY (LD0-10F) REV.00).
Main features of the ERISSON 49LES70T2 device:
Installed matrix (LED-panel) LC490DUJ-SHA2.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9903GN PWM controller. As power elements of the LED driver, keys of the AOD4286 type are used.
The necessary supply voltages for all nodes of the TV ERISSON 49LES70T2 are formed by the power supply module 168P-L5L017-W3, or its analogs using TEA1733 microcircuits.
MainBoard - the main board (motherboard) is a 5800-A6M33G-0P10 module, using SPI FLASH: 25Q64CS1G, AUDIO: TPA3110D2, and others.Trademark: ERISSON, Model: 49LES70T2.
Briefly from the TV: LCD, 1080p Full HD, diagonal 48.5 "(123 cm), HDMI: 3, USB: 2, there is support for DVB-T2, backlight type: Edge LED.
The composition includes MainBoard 5800-A6M33G-0P10 VER00.00 and LCD-panel LC490DUJ-SHA2.
Power supply unit (PSU) 5800-L5L017-W300, or 168P-L5L017-W3 power Supply.
TV ERISSON 49LES70T2 with LCD display LC490DUJ-SHA2, diagonal size 48.5 "(123 cm) 16: 9 format. The required brightness of the screen 280 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 900: 1. The LED-panel of this TV has an end LED backlight - Edge LED.The TV design and technical features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution according to the standard 1080p (Full HD). the frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG .
The power of the sound system 16 W (2x8 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, HDMI x3, USB x2. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: With stand 1111x708x296 mm, Without stand 1067x660x39 mm.
Attention! The LC490DUJ-SHA2 panel of an ERISSON 49LES70T2 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
Posted By: FRANK at 07:19
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