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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Wednesday 18 March 2020

REPAIR / SERVICING TV HAIER LE32B8000T

Technical description and composition of the HAIER LE32B8000T TV, type of panel and applicable modules. The composition of the modules.
Haier LED
Model: LE32B8000T
Chassis / Version: MS308C1-ZC01-01
Panel: LSC320AN02-S01
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3064, OB3350
MOSFET LED driver: MDD1951
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273 (PWM SOT23-6)
MainBoard: MS308C1-ZC01-01
IC MainBoard: CPU: MSD308BEM, SPI Flash: GD25Q64, SOUND: TPA1517
Tuner: TDA18275
Technical Specifications LE32B8000T
HAIER LE32B8000T
General repair guidelines for TV LCD LED
Possible malfunctions
- The Haier LE32B8000T TV does not turn on, does not respond to the remote control and the control panel buttons, does not blink with any indicators.
With such manifestations, a malfunction is most likely to be detected in the elements of the power module, which in this TV is combined with the MainBoard MS308C1-ZC01-01 main board. It is necessary to measure the secondary output voltage of the source, and in case of their absence, check the serviceability of the power switches and rectifier diodes of the AC / DC converter for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during 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. The PWM microchip (PWM) OB2273 (PWM SOT23-6) can also cause a malfunction of the power switch of the converter and is checked by replacing it with a known good one.
- There is no image, but there is sound, it responds to the remote. Or the image appears when you turn it on and immediately disappears
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, sometimes you can detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- 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 motherboard MS308C1-ZC01-01 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). When repairing an MB board, you need to check its CPU components: MSD308BEM, SPI Flash: GD25Q64, SOUND: TPA1517. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The malfunction of the TDA18275 tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
It should be remembered! Attempts to independently repair the Haier LE32B8000T 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  ----------->   Haier LE32B8000T, Main: MS308C1-ZC01-01, Panel: LSC320AN02-S01
To reduce the backlight current in LED drivers with the AP3064 controller (AP3064AM), it is necessary to proportionally increase the resistance of the resistor from pin 2 (ISET) to the housing. The maximum current in each of the four channels (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 1200 / Rset.

The appearance of the MainBoard MS308C1-ZC01-01 is shown in the figure below:
MS308C1-ZC01-01
MS308C1-ZC01-01 can be used in TVs:
Haier LE32B8000T (Panel LSC320AN02-S01), JVC LT-32M340 (Panel LK315T3HB87 ), MYSTERY MTV-3230LT2 (Panel V320BJ7-PE1), MYSTERY MTV-2426LT2 (Panel V236BJ1-P03), MYSTERY MTV-2231LT2 (Panel LC215DT4A).
Key Features of HAIER LE32B8000T:
The matrix (LED panel) LSC320AN02-S01 is installed.
To power the backlight LEDs, a converter is used, combined with the main board MS308C1-ZC01-01, it is controlled by the AP3064, OB3350 PWM controller. As the power elements of the LED driver, keys of the MDD1951 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using OB2273 microcircuits (PWM SOT23-6).
MainBoard - the main board (motherboard) is an MS308C1-ZC01-01 module, using CPU chips: MSD308BEM, SPI Flash: GD25Q64, SOUND: TPA1517 and others.
The TDA18275 tuner provides television reception and channel tuning.

Brand: HAIER, Model: LE32B8000T.
Shortly from the TV: LCD, LED backlight, 32 ", 1366x768, 720p HD, sound: 16W, HDMI connectors: 2.
Manufacturer: TPV ICS Russia, Shushary, St. Petersburg and Qingdao Haier Industry Zone (China).
Developer: Haier Group Corporation. Qingdao (Qingdao). China
The composition uses MainBoard MS308C1-ZC01-01 and LCD panel (matrix) LSC320AN02-S01. The power supply is combined with the MainBoard.
HAIER LE32B8000T TV with LSC320AN02-S01 LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 220 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 3000000: 1 is achieved by special control of the LEDs. V LED TV backlighting technology for this TV model is implemented, it is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed It is used in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, JPEG.
The power of the sound system 16 W (2x8 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x2, 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, 1360x768.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: With stand 733x473x200 mm, Without stand 733x439x69 mm.
Attention! The panel of the LSC320AN02-S01 HAIER LE32B8000T 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 09:02
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