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 LTA-19N508HCP

Technical description and composition of the AKAI LTA-19N508HCP TV, panel type and applicable modules. The composition of the modules.
AKAI
Model: LTA-19N508HCP
Chassis / Version: LS03
Panel: HT190WG1-600
Inverter (backlight): integrated into PSU; 950V 9mA
PWM Inverter: MP1038EY (28pin)
Power Supply (PSU): FSP048-2PI04
PWM Power: STR-W6525
MainBoard: JUG7.820.534 -1 LS03
IC MainBoard: MST718BE-LF, CSC2314F, JUG7.820-534, M, P1484EN, TDA9885S, TEA2025B
Tuner: TAF5-C2IP1W
Technical Specifications LTA-19N508HCP
AKAI LTA-19N508HCP
General recommendations for repairing TV LCD
Possible manifestations of defects
- The AKAI LTA-19N508HCP TV does not turn on, does not respond to the remote control and the control panel buttons, and does not blink with any indicators.
With such manifestations, a malfunction is most likely to be detected in the FSP048-2PI04 power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can emergencyly operate in the short circuit mode, and during short circuit in the power 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 STR-W6525 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 the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the JUG7.820.534 motherboard should be started 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 (SSB) card, you need to check the health of its elements - MST718BE-LF, CSC2314F, JUG7.820-534, M, P1484EN, TDA9885S, TEA2025B. Defective components should be replaced.
Before changing the tuner TAF5-C2IP1W, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding tuner pins and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the AKAI LTA-19N508HCP TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH  ----------->   AKAI LTA-19N508HCP LS03, Main: JUG7.820.534 -1 LS03, Panel: HT190WG1-600

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    AKAI LTA-19N508HCP Chassis LS03

LTA-15N602M, LTA-15N680HCP, LTA-15N686HCP, LTA-19N508HCP, LTA-22N680HCP, LTA-22N686HCP


 The appearance of the MainBoard JUG7.820.534 is shown in the figure below:
JUG7.820.534
JUG7.820.534 can be used on TVs:
AKAI LTA-19N508HCP (Panel HT190WG1-600), AKAI LTA-15N602M (Panel HT150X02-100), SUPRA STV-LC1502 (Panel HT150X02-100).
The appearance of the power supply
Key features of the AKAI LTA-19N508HCP device:
Installed matrix (LCD panel) HT190WG1-600.
To power the backlight, a converter is used, combined with a power supply, controlled by the MP1038EY (28pin) PWM controller.
The necessary supply voltages for all nodes of the TV AKAI LTA-19N508HCP are generated by the power module FSP048-2PI04, or its analogs using microcircuits STR-W6525.
MainBoard - the main board (motherboard) is a JUG7.820.534 module, using chips MST718BE-LF, CSC2314F, JUG7.820-534, M, P1484EN, TDA9885S, TEA2025B and others.
The TAF5-C2IP1W tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: BOE
Model: HT190WG1-600
Type: a-Si TFT-LCD, Panel
Diagonal size: 19.0 inch
Resolution: 1440x900, WXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 408.24x255.15 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V

 Brand: AKAI, Model: LTA-19N508HCP.
Short from TV: LCD, 19 ", 1440x900, 720p HD, sound: 4 watts.
The composition uses MainBoard JUG7.820.534 -1 LS03 and an LCD panel (matrix) HT190WG1-600.
Power Supply Unit (PSU) FSP048-2PI04 Power Supply.
AKAI LTA-19N508HCP TV with an HT190WG1-600 LCD, 19 "(48 cm) diagonal 16:10 aspect ratio. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 1000: 1. It is possible to view images in high quality HD at a resolution of 1440x900 pixels in the standard for 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 to camp Darts 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 x2, S-Video, component, VGA. 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, 1360x768.
The power consumed by the TV working in the network mode is 60 watts.
Overall dimensions: 475x400x175 mm.
Attention! The HT190WG1-600 panel of the AKAI LTA-19N508HCP LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!

Posted By: FRANK at 05:48
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