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-19C05P

Technical description and composition of the AKAI LEA-19C05P TV, panel type and applicable modules. The composition of the modules.
AKAI LED
Model: LEA-19C05P
Panel: CLAA185WA04
T-CON: 185WA01S
LED driver (backlight): integrated into MainBoard
PWM LED driver: A8504 (26 pin)
Trans LED driver: EPC30-B752
Power Supply (PSU): PW0500205 // PW52057B REV: 00
PWM Power: LD7575BGS (PWM flyback)
MOSFET Power: SVD4N65F
MainBoard: JUG7.820.699-1 LS07
IC MainBoard: 1517P, 24LC32B, TSUMV26KU-LF
Tuner: CDT-3LC4I1-00
Control: A4001031 & A10010025
Technical Specifications LEA-19C05P
AKAI LEA-19C05P
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The AKAI LEA-19C05P TV does not turn on and does not show any signs of turning on at all. There are no reactions to the control buttons or the remote control.
With such manifestations, in most cases, the PW0500205 power module is faulty. It is necessary to verify the presence of secondary voltages and, if not, check the power switches (SVD4N65F) 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 chip LD7575BGS (PWM flyback) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- 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.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode 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 JUG7.820.699-1 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - 1517P, 24LC32B, TSUMV26KU-LF. Defective components should be replaced.
Before changing the tuner CDT-3LC4I1-00, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding outputs of the tuner and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.




Repair MainBoard
The appearance of the MainBoard JUG7.820.699-1 is shown in the figure below:
JUG7.820.699-1
JUG7.820.699-1 can be used on TVs:
AKAI LEA-19C05P (Panel CLAA185WA04), AKAI LEA-22C05P (Panel CLAA 215FA04S), Akai LEA-24C05P (Panel V236H1-LE2 Rev.C1).
The appearance of the power supply
Key Features of the AKAI LEA-19C05P:
Installed matrix (LED-panel) CLAA185WA04.
The matrix control uses the Timing Controller (T-CON) 185WA01S.
To power the backlight LEDs, a converter is used, combined with the main board JUG7.820.699-1, controlled by the A8504 PWM controller (26 pin). The transformer EPC30-B752 is installed in the LED driver converter.
The necessary supply voltages for all nodes of the AKAI LEA-19C05P TV are generated by the PW0500205 power module or its analogs using LD7575BGS (PWM flyback) microcircuits and power switches of the SVD4N65F type.
MainBoard - the main board (motherboard) is a JUG7.820.699-1 module, using chips 1517P, 24LC32B, TSUMV26KU-LF and others.
The tuner CDT-3LC4I1-00 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CPT
Model: CLAA185WA04
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)
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V

Brand: AKAI, Model: LEA-19C05P.
Shortly from the TV: LCD, 720p HD, diagonal 19 "(48 cm), there is HDMI.
The composition uses the MainBoard JUG7.820.699-1 LS07 and the LCD panel (matrix) CLAA185WA04.
Power supply unit (PSU) PW0500205, or PW52057B REV: 00 Power Supply.
AKAI LEA-19C05P TV with CLAA185WA04 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. High quality HD images can be viewed at a resolution of 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, NTS C. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 4 W (2x2 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. 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: With stand 772x546x200 mm, Without stand 772x486x46 mm.
Attention! The CLAA185WA04 panel of the AKAI LEA-19C05P 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 07:44
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