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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Saturday 21 March 2020

REPAIR / SERVICING TV BBK LT3214S

Technical description and composition of the BBK LT3214S TV, panel type and applicable modules. The composition of the modules.
BBK
Model: LT3214S
Chassis / Version: MST9
Panel: LC320W01 (SL) (A1)
T-CON: LC320W01-SLA1 MDK 336V-0n P / N 19-100056
Inverter (backlight): KLS-EE32HK14A // HIPC-1654E / HIU-812-M (S) MASTER + SLAVE
PWM Inverter: BD9897FS.LM2901, LM2904, FDD8447L
Power Supply (PSU): HLP-23A01 E / RSAG7.820.848A / ROH VER.H
PWM Power: NCP1207
MOSFET Power: FQP3N80C
MainBoard: RSAG7.820.1037 / ROH
IC MainBoard: MST9E88L, F40-100GLR, 24C32AN, TMDS341A, TMDS341A
Tuner: TDQ-6FT / W126H
Control: IR: RSAG7.820.986A
Technical Specifications LT3214S
BBK LT3214S
General recommendations for repairing TV LCD
Possible manifestations of defects
- The BBK LT3214S TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
In most of these cases, the HLP-23A01 main switching power supply fails. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters 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 short circuit in the elements of the primary circuit, the main fuse 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) NCP1207. It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the RSAG7.820.1037 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). Board repair and replacement of MST9E88L, F40-100GLR, 24C32AN, TMDS341A, TMDS341A microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before replacing the TDQ-6FT / W126H tuner, if there is no channel tuning, 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 BBK LT3214S 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 ------------->  BBK LT2614, BBK LT3214 Chassis M-STAR

Service Manual with Schematic Diagram 42 pages 2006 on model LT2614S, LT3214S.

 servicee mode:
 1. Open the Main menu with the MENY key on the remote control, 2. Select the Sound menu with the Up / Down keys, 3. Select the Balance item, 4. Dial 0, 5, 3, 2.

Repair MainBoard
The appearance of the MainBoard RSAG7.820.1037 is shown in the figure below:
RSAG7.820.1037
RSAG7.820.1037 can be used in TVs:
BBK LT2614S (Panel V260B1-L02), BBK LT3214S (Panel LC320W01 (SL) (A1)), BBK LT4214S (Panel LC420WX7 Sl A1), BBK LT3215S (Panel LC320WX3 (SL) (C1)), BBK LT4014S (Panel LTA400WT- L17), DAEWOO DLP-26H1C (Panel V260B1-L02).
The appearance of the power supply
Main features of the BBK LT3214S device:
Installed matrix (LCD panel) LC320W01 (SL) (A1).
The matrix control uses the Timing Controller (T-CON) LC320W01-SLA1.
To power the backlight, an inverter KLS-EE32HK14A is used, it is controlled by the PWM controller BD9897FS.LM2901, LM2904, FDD8447L.
The necessary supply voltages for all nodes of the TV BBK LT3214S are generated by the HLP-23A01 power module or its analogs using NCP1207 microcircuits and power switches of the FQP3N80C type.
MainBoard - the main board (motherboard) is an RSAG7.820.1037 module, using microchips MST9E88L, F40-100GLR, 24C32AN, TMDS341A, TMDS341A and others.
The TDQ-6FT / W126H tuner provides TV reception and channel tuning.
Information from an alternative source:
BBK LT3214S Chassis MST9
Panel Type (Matrix): AX080D002F
Motherboard: RSAG7.820.1037 / ROH, MST9E88L, F40-100GLR, 24C32AN, TMDS341A, Tuner: TDQ-6FT / W126H
T-con: MDK 336V-0n P / N 19-100056
Invertor: HIU-812M & HIU-812S, BD9897FS, LM2901, LM2904, 1H29TB x4
PSU: HLP-23A01 E / RSAG7.820.848A / ROH VER.H Schematic, Schematic HIU-812M
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SLA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 07:10
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