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 42LE3110

Technical description and composition of the TV AIWA 42LE3110, type of panel and applicable modules. The composition of the modules.
AIWA LED
Model: 42LE3110
Chassis / Version: V1K11
Panel: K420B1CE10
LED backlight: EDGE LED
LED driver (backlight): integrated into PSU
Power Supply (PSU): 168P-P42EWB-HCW0
PWM Power: FSFR1700XSL, OB5223AP, OB6572CP
MainBoard: 35015749 REV-01
IC MainBoard: Spi Flash: W25Q32, Eeprom: 24C64
Tuner: AFT / W127
Control: Service Mode: MENU 2008
Specifications 42LE3110
AIWA 42LE3110
General repair guidelines for TV LCD LED
Possible malfunctions
- AIWA 42LE3110 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Most likely in this case, the main switching power supply (IPS) 168P-P42EWB-HCW0 is faulty. 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 the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most 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 chips FSFR1700XSL, OB5223AP, OB6572CP are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
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.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with 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 turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 35015749 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its Spi Flash: W25Q32, Eeprom: 24C64 chips and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the AFT / W127 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
For owners of the 42LE3110 TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH  ----------->   AIWA 42LE3110 V1K11, Main: 35015749 REV-01, Panel: K420B1CE10


 The appearance of MainBoard 35015749 is shown in the figure below:
35015749
35015749 can be used in TVs:
AIWA 32LE3010 (Panel LC320EXN (SD)(A1)), AIWA 42LE3110 (Panel K420B1CE10).
Key Features of the AIWA 42LE3110:
Installed matrix (LED panel) K420B1CE10.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the TV AIWA 42LE3110 are formed by the power supply module 168P-P42EWB-HCW0, or its analogs using the FSFR1700XSL, OB5223AP, OB6572CP microcircuits.
MainBoard - the main board (motherboard) is a module 35015749, using Spi Flash chips: W25Q32, Eeprom: 24C64 and others.
The AFT / W127 tuner provides TV reception and channel tuning.


 Trademark: AIWA, Model: 42LE3110.
Short from TV: LCD, 42 ", 1920x1080, 1080p Full HD HDMI: 3.
The composition uses MainBoard 35015749 REV-01 and the LCD panel (matrix) K420B1CE10.
Power Supply Unit (PSU) 168P-P42EWB-HCW0 Power Supply.
AIWA 42LE3110 TV with K420B1CE10 LCD, 42 "(107 cm) diagonal display in 16: 9 format. This model uses side illumination from Edge LEDs.
The K420B1CE10 panel and the 35015749 motherboard software provide for watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Stereo sound is realized by two built-in 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 x3, 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, 1360x768.
Attention! The K420B1CE10 panel of the AIWA 42LE3110 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 06:26
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