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 LE28F1000T

Technical description and composition of the HAIER LE28F1000T TV, type of panel and applicable modules. The composition of the modules.
HAIER LED
Model: LE28F1000T
Chassis / Version: TP.MS3463S.PB801
Panel: HW280WX2-270 CN280CN200
LED backlight: CRH-K28HT3030T020673G-Rev1.1W
LED driver (backlight): integrated into MainBoard
PWM LED driver: SN51DP
MOSFET LED driver: AOD458
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-220
MainBoard: TP.MS3463S.PB801
IC MainBoard: CPU: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP
Tuner: XF-3SDT-H
Technical Specifications LE28F1000T
HAIER LE28F1000T
General repair guidelines for TV LCD LED
Possible malfunctions
- The HAIER LE28F1000T TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
The malfunction in such cases should be sought in the elements of the power source - the network voltage converter (AC / DC), which is located on the MainBoard TP.MS3463S.PB801 main board. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches (TO-220) and rectifier diodes in the converters for possible breakdown.
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, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM SOT23-6 PWM chips are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the TP.MS3463S.PB801 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 some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before replacing the XF-3SDT-H tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
It should be remembered! Attempts to independently repair the HAIER LE28F1000T 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!
Schematic diagram / Trouble Shooting ---------->  Chassis TP.MS3463S.PB801.

FIRMWARE FOR SPI FLASH ---------->   HAIER LE28F1000T, Main: TP.MS3463S.PB801, Panel: HW280WX2-270 CN280CN200

 The appearance of MainBoard TP.MS3463S.PB801 is shown in the figure below:
TP.MS3463S.PB801
TP.MS3463S.PB801 can be used in TVs:
AKAI LEA-40V35M (Panel LSC400HM06), AKIRA 32LED38T2P (Panel ST3151A05-8), AKIRA 32LED02T2M (Panel ST3151A04-9 Ver.2.1), BBK 32LEM-1029/TS2C (Panel C320X16-E18-H), BBK 39LEM-1033/TS2C (Panel C390X15-E8-A G01), BBK 32LEM-1026/TS2C (Panel CX315DLEDM ST3151A05-8), BBK 32LEM-1027/TS2C (Panel ST3151A05-8 / CX315DLEDM), DEXP F43C7100K (Panel LC430DUY (SH)(A1)), DEXP F42B7000M (Panel V420HJ2-P01), DEXP F43C7000C (Panel C430F14-E1-L / LC430DUY), DEXP F40B7100K (Panel LSC400HN02-G02 40N06-L-HPX1F1), DEXP H28C7100C (Panel C275X15-E1-H (G31)), DEXP H32C7300K (Panel LSC320AN02), DEXP H32D7100C (Panel ST3151A05-8 Ver2.5), DEXP H28D7300K (Panel HV280WX2-260), ERISSON 32LES78T2W (Panel KM0320LDRH0037), ERISSON 32LEE30T2 (Panel LK315T3HB87-12V), SUPRA STV-LC32T560WL (Panel LSC320AN10), SUPRA STV-LC32T550WL (Panel LSC320AN02), SUPRA STV-LC40T500WL (Panel C39X15-E7-A), TELEFUNKEN TF-LED32S45T2 (Panel LK315T3HB87-12V), THOMSON T39D20DH-01B (Panel T390XVN01.0).
Key Features of HAIER LE28F1000T:
Installed matrix (LED panel) HW280WX2-270 CN280CN200.
To power the backlight LEDs, a converter is used, combined with the TP.MS3463S.PB801 main board, controlled by the SN51DP PWM controller. As power elements of the LED driver, keys of the AOD458 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits and TO-220 type power switches.
MainBoard - the main board (motherboard) is a TP.MS3463S.PB801 module, using CPU chips: MSD3463GU, SPI Flash: GD25Q64, AUDIO: OB6220VP and others.
The XF-3SDT-H tuner allows you to receive television programs and tune to channels.


 HAIER LE28F1000T TV with HW280WX2-270 LCD display, diagonal size 28 "(71 cm) in 16: 9 format. The required screen brightness of 180 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 1200: 1. Direct LED backlighting with direct LEDs is implemented in the TV’s LCD panel, and HD images can be viewed in high quality with a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready) Supported media file formats: MP3, JPEG. It has two built-in speakers, using the 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, component, VGA, HDMI x3, USB.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 637x414x201 mm, without stand 637x390x80 mm.
Mass of the TV: 2.87 kg.
Attention! The HW280WX2-270 CN280CN200 panel of the HAIER LE28F1000T 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 08:55
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