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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Friday 20 March 2020

REPAIR / SERVICING TV BBK LT1529S

Technical description and composition of the BBK LT1529S TV, type of panel and applicable modules. The composition of the modules.
BBK
Model: LT1529S
Chassis / Version: MSTV2203-ZC01-01
Panel: M156MWR1
T-CON: MTD003-LF-00; AAT1176 (Analog MAX17075)
Inverter (backlight): integrated into PSU
PWM Inverter: BIT3102B
MOSFET Inverter: AO4435, AO4804
Power Supply (PSU): TV1901-ZC02-01B
PWM Power: DM0565R
MainBoard: MSTV2203-ZC01-01 (B)
IC MainBoard: TSUMV26KU-LF, MX25L4005A, 24C32, TE330C X2, 74HC4052D, TDA1517P
Tuner: F21WT-3BAR-E
Technical Specifications LT1529S
BBK LT1529S
General recommendations for repairing TV LCD
Possible malfunctions
- The BBK LT1529S TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Usually, with such manifestations, the defect is caused by faulty elements in the main power supply module TV1901-ZC02-01B. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) DM0565R, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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 defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
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 when working, and after they are finished, 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 MSTV2203-ZC01-01 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements TSUMV26KU-LF, MX25L4005A, 24C32, TE330C X2, 74HC4052D, TDA1517P requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
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 voltage of the tuner F21WT-3BAR-E and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention to users! Independent repair of the BBK LT1529S TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
 
 
 Schematic Diagrams 10 pages of 2009 on the LT1529S
 
SCHEMATIC / MANUAL ------------->  (Main Board) MSTV2203-N1

FIRMWARE FOR  SPI FLASH, EEPROM ------------->   BBK LT1529S, Main: MSTV2203-ZC01-01 (B), Panel: M156MWR1
 
 
  The appearance and voltage measurements at the control points of MainBoard MSTV2203-ZC01-01 are shown in the figure below:
MSTV2203-ZC01-01
MSTV2203-ZC01-01 can be used in TVs:
BBK LT1929S (Panel F21WT-3BAR-E), BBK LT1529S (Panel M156MWR1), MYSTERY MTV-2206W (Panel CLAA216WA01), MYSTERY MTV-1906W (Panel M190MWW3), MYSTERY MTV-1607w (Panel M156MWR1), MYSTERY MTV-1907W (Panel BOE HT185WX2-10), MYSTERY MTV-2417WHD (Panel M236MWF1), MYSTERY MTV-2407WH (Panel V236H1-L05 Rev:C1), MYSTERY MTV-2217WD (Panel CLAA215FA05), MYSTERY MTV-1917WD (Panel CLAA185WA06).
The appearance of the power supply
Main features of the BBK LT1529S device:
The matrix (LCD panel) M156MWR1 is installed.
The matrix control uses the Timing Controller (T-CON) MTD003-LF-00 ;.
To power the backlight, a converter is used, combined with a power supply, controlled by a BIT3102B PWM controller. As power elements of the inverter, keys of the type AO4435, AO4804 are used.
The necessary supply voltages for all nodes of the TV BBK LT1529S are generated by the TV1901-ZC02-01B power supply module, or its analogs using DM0565R microcircuits.
MainBoard - the main board (motherboard) is an MSTV2203-ZC01-01 module, using TSUMV26KU-LF, MX25L4005A, 24C32, TE330C X2, 74HC4052D, TDA1517P, and others microcircuits.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
 
 BBK LT1529S LCD TV with M156MWR1 LCD display, diagonal size 15 "(39 cm) 16: 9 format. The brightness of the screen is 500 cd / m² using CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 1200: 1. It is possible to view images in high quality HD 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, NTSC. Graphic processing and digital signal generation occurs in the standard ah 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the acoustic system of sound 3 W (2x1.5) is provided by 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, component, SCART, RGB, VGA, HDMI. 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, 1280x1024.
The power consumed by the TV in the operating mode from the network is 30 watts.
Overall dimensions: With stand 390x304x160 mm, Without stand 390x290x74 mm.
TV Weight: 2.8 kg.
Attention! The BBK LT1529S LCD TV panel M156MWR1 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 06:43
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