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 9 April 2020

REPAIR / SERVICING TV AIWA 32LE4020

Technical description and composition of the TV AIWA 32LE4020, type of panel and applicable modules. The composition of the modules.
AIWA LED
Model: 32LE4020
Chassis / Version: V1R06
Panel: LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
MOSFET LED driver: D4286
Power Supply (PSU): integrated into MainBoard
PWM Power: LNK6778K
MainBoard: 5800-A6M31G-0P10 Ver.00.01 2015-08-13
IC MainBoard: 25Q64CSIG, TPA3113D2
Tuner: NoName
Control: Service Login: SOURCE 3195
Specifications 32LE4020
AIWA 32LE4020
General repair guidelines for TV LCD LED
Possible malfunctions
- The AIWA 32LE4020 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
The malfunction in such cases, first of all, should be sought in the power elements of a switching power supply (IIP) - a network voltage converter (AC / DC), which in this TV model is combined with the MainBoard 5800-A6M31G-0P10 main board. Then it is necessary to measure its output voltage and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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 circuits (PWM) LNK6778K are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 5800-A6M31G-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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements 25Q64CSIG, TPA3113D2 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a NoName tuner is suspected of a malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Owners of the 32LE4020 TV are recommended to repair only qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH  ----------->   AIWA 32LE4020 V1R06, Main: 5800-A6M31G-0P10 Ver.00.01 2015-08-13, Panel: LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00

 To reduce the backlight current, the total resistance of the resistors relative to the housing on the ISET pin of the MP3398A should be proportionally increased. ISET (current setting) - pin 8 in the SOIC-20 package or pin 6 in the SOIC-16 package.

Repair MainBoard
The appearance of the MainBoard 5800-A6M31G-0P10 is shown in the figure below:
5800-A6M31G-0P10
5800-A6M31G-0P10 can be used in TVs:
AIWA 32LE4020 (Panel LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00), AIWA 32LE7020 (Panel LC320DXJ (SH)(A2)), ERISSON 32LES71T2 (Panel LC320DXJ-SFA2), ERISSON 32LES70T2 (Panel LC320DXJ (SF)(A2)), SUPRA STV-LC32T650WL (Panel LC320DXJ-SFA2 RDL320HY(LD0-803)45).
Key Features of AIWA 32LE4020:
Installed matrix (LED-panel) LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00.
To power the backlight LEDs, a converter is used, combined with the main board 5800-A6M31G-0P10, controlled by the MP3398A PWM controller. As the power elements of the LED driver, keys of the D4286 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using LNK6778K microcircuits.
MainBoard - the main board (motherboard) is a 5800-A6M31G-0P10 module, using 25Q64CSIG, TPA3113D2 chips and others.
The NoName tuner provides television reception and channel tuning.

 Trademark: AIWA, Model: 32LE4020.
Briefly from the TV: LCD, LED backlight, 31.5 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 2.
The composition includes MainBoard 5800-A6M31G-0P10 Ver.00.01 2015-08-13 and LCD panel (matrix) LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00. The power supply is combined with the MainBoard.
AIWA 32LE4020 TV with LCD display LC320DXJ-SHA2, diagonal size 31.5 "(80 cm) 16: 9 format. This model uses side illumination LED Edge LED.
The LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00 panel and the 5800-A6M31G-0P10 motherboard software provide for viewing broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
Supported media file formats: MP3, MPEG4, MKV, JPEG.
The power of the sound system 20 W (2x10 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), HDMI x2, USB. An output for connecting headphones is provided. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Attention! Panel LC320DXJ-SHA2 GDL320HY (LD0-008) Rev.00 LED-TV AIWA 32LE4020 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 05:33
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