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 42LEC2000

Technical description and composition of the ERISSON 42LEC2000 TV, type of panel and applicable modules. The composition of the modules.
ERISSON LED
Model: 42LEC2000
Chassis / Version: LS1B
Panel: M420F13-E1-L (G1)
T-CON: LC500DUE-SFR1
LED driver (backlight): integrated into PSU
PWM LED driver: NCS1002-D
MOSFET LED driver: AOD4504
Power Supply (PSU): R-HS100D-1MF12
PWM Power: FA5591, NCP1251A, NCP1271A
MOSFET Power: 13N50C, 7N65
MainBoard: JUC7.820.00084054 LS1B 32C2000
IC MainBoard: SPI Flash: GD25Q64
Tuner: DMI21-C2I3RH
Specifications 42LEC2000
ERISSON 42LEC2000
General repair guidelines for TV LCD LED
Possible malfunctions
- ERISSON 42LEC2000 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
With such manifestations, the R-HS100D-1MF12 power module usually fails. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (13N50C, 7N65) of converters and rectifier diodes for possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips FA5591, NCP1251A, NCP1271A are usually checked by replacing with new, or obviously working.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power 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 break in the LED lines without disassembling the panels using 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the JUC7.820.00084054 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing SPI Flash elements: GD25Q64 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before replacing the DMI21-C2I3RH tuner, if there is no tuning for 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
Owners and users of the ERISSON 42LEC2000 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH  ----------->   ERISSON 42LEC2000 LS1B, Main: JUC7.820.00084054 LS1B 32C2000, Panel: M420F13-E1-L (G1) JUC5.872.00115390+JUC5.873.062

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    R-HS100D-1MF12 XR2.908.184DL Hitachi HSM35D-1MF Power supply

 The appearance of the MainBoard LS1B is shown in the figure below:
LS1B
JUC7.820.00084054 can be used in TVs:
BBK 40LEM-3080/FT2C (Panel ECG390AH-LD2 (SN)), BBK 32LEM-3081/T2C (Panel M320X13-E2-H), BBK 32LEM-1003/T2C (Panel M320X13-E4-L HD), DEXP 28A3000 (Panel R-HS055D-1MF), DEXP 50A7000 (Panel C500F13-E3-A), DNS C28DC2000 (Panel M280X13-E1-H), DNS C39DC2000 (Panel M390F13-E1-A), ERISSON 42LEC2000 (Panel M420F13-E1-L (G1)), ERISSON 55LEC2000 (Panel M550F13-E1-A 1080p Full HD), ERISSON 28LEC2000 (Panel M280X13-E1-H), RUBIN RB-32SD8T2C (Panel M320X13-E3-H), TELEFUNKEN TF-LED32S12T2 (Panel M320X12-E9-A(1)).
The appearance of the power supply
Main features of the ERISSON 42LEC2000 device:
Installed matrix (LED panel) M420F13-E1-L (G1).
The matrix control uses the Timing Controller (T-CON) LC500DUE-SFR1.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the NCS1002-D PWM controller. As power elements of the LED driver, keys of the AOD4504 type are used.
The necessary supply voltages for all nodes of the ERISSON 42LEC2000 TV are generated by the R-HS100D-1MF12 power module, or its analogs using FA5591, NCP1251A, NCP1271A microcircuits and 13N50C, 7N65 type power switches.
MainBoard - the main board (motherboard) is a JUC7.820.00084054 module, using SPI Flash chips: GD25Q64 and others.
The DMI21-C2I3RH tuner provides television reception and channel tuning.


 Trademark: ERISSON, Model: 42LEC2000.
Briefly from the TV: LCD, 720p HD, 42 "(107 cm) diagonal, HDMI: 2, USB: 2, backlight type: Edge LED.
The composition uses MainBoard JUC7.820.00084054 LS1B 32C2000 and LCD panel (matrix) M420F13-E1-L (G1).
Power Supply Unit (PSU) R-HS100D-1MF12 Power Supply.
ERISSON 42LEC2000 TV with M420F13-E1-L LCD, 42 "(107 cm) diagonal size in 16: 9 format. The LED-panel of this TV has LED backlighting - Edge LED. You can view images in high quality HD with Resolution 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, JPEG. tereozvuk realized by two built-in speakers. Use audio NICAM STEREO processing system.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), component, VGA, HDMI x2, USB x2. 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.
Overall dimensions: With a support 897x597x230 mm, Without a support 732x438x58 mm.
Attention! The M420F13-E1-L (G1) panel of an ERISSON 42LEC2000 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 06:51
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