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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Monday 6 April 2020

REPAIR / SERVICING TV AKAI LEA-19H03P

Technical description and composition of the TV AKAI LEA-19H03P, type of panel and applicable modules. The composition of the modules.
AKAI LED
Model: LEA-19H03P
Chassis / Version: MT8222
Panel: M185XW01 V6
LED driver (backlight): 0091802061 V1.3 MPS950 3388DR (UH = 43v, UL = 2v5)
PWM LED driver: MPS950 3388DR
Power Supply (PSU): Adapter JS-12030V 12v 3a
PWM Power: PWM SOT23-6
MainBoard: 0091802001
IC MainBoard: MT8222, MP1482, MP1484, TPA1517NE, TDA9885TS / V5
Tuner: TDQ-6ID / GW115HR
Technical Specifications LEA-19H03P
AKAI LEA-19H03P
General repair guidelines for TV LCD LED
Possible malfunctions
- The AKAI LEA-19H03P TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
With such manifestations, a malfunction is most likely to be detected in the Adapter power module.
The external adapter power adapter JS-12030 12V 3a is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM SOT23-6 PWM can also cause a malfunction of the power switch of the converter and is 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.
In most cases, the malfunction is caused by the lack of a backlight display. 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 is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode 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 0091802001 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MT8222, MP1482, MP1484, TPA1517NE, TDA9885TS / V5 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the power supply of the TDQ-6ID / GW115HR tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the AKAI LEA-19H03P 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!

 SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   LEA-19H03P

 Key Features of the AKAI LEA-19H03P:
Installed matrix (LED-panel) M185XW01 V6.
The LED driver 0091802061 is used to power the backlight LEDs, it is controlled by the MPS950 3388DR PWM controller.
To power all internal components of the AKAI LEA-19H03P TV, an external adapter type JS-12030 12v 3a is used using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a module 0091802001, using microcircuits MT8222, MP1482, MP1484, TPA1517NE, TDA9885TS / V5 and others.
The TDQ-6ID / GW115HR tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 V6
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 strings WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V

 Brand: AKAI, Model: LEA-19H03P.
Briefly from the TV: LCD, LED backlight, 19 ", 1366x768, 720p HD, sound: 5 watts.
The composition uses MainBoard 0091802001 and an LCD panel (matrix) M185XW01 V6.
Power supply unit external Adapter JS-12030 12v 3a.
AKAI LEA-19H03P TV with an M185XW01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1000: 1 The LED display backlighting technology is implemented in the model’s display manufacturing technology. HD images can be viewed in high resolution at 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-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, WMA, MPEG4, JPEG.
The power of the speaker system of sound 5 W (2x2.5 W) provide 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), AV, audio x3, component, VGA, HDMI, USB. 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.
The power consumed by the TV working in the network mode is 30 watts.
Overall dimensions: 460x349x160 mm.
Mass of the TV: 3.2 kg.
Attention! The M185XW01 V6 panel of the AKAI LEA-19H03P 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 07:51
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