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, 10 April 2020

REPAIR / SERVICING TV DAEWOO DLP-20J3

Technical description and composition of the DAEWOO DLP-20J3 TV, type of panel and applicable modules. The composition of the modules.
DAEWOO
Model: DLP-20J3
Panel: LC201V02 (SD) (A3)
Inverter (backlight): integrated into PSU
PWM Inverter: STR-H2003 (24 pin)
MOSFET Inverter: APM4546 (8 pin)
Trans Inverter: EFD1221B
Power Supply (PSU): IPB-6015N01 RUS Ver04
PWM Power: SRTW6253
MainBoard: SL-130P Main
IC MainBoard: 1501-B LOC-1, TDA9178T, LA42032
Tuner: UV1316A
Technical Specifications DLP-20J3
DAEWOO DLP-20J3
General recommendations for repairing TV LCD
Possible malfunctions
- DAEWOO DLP-20J3 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.
With such manifestations, the IPB-6015N01 power supply module usually 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 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 chip of the SRTW6253 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 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 inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the SL-130P 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips 1501-B LOC-1, TDA9178T, LA42032 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the tuner UV1316A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
For owners of the DLP-20J3 TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>   DAEWOO chassis SL-130P


SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    DAEWOO DLT-19W4, DLP-19W4, DLT-22W4, DLP-22W4, DLT-20J1, DLP-20J1M, DLT-20J3, DLP-20J3M, DLT-20J9, DLP-20J9M, DLT-19L1, DLP-19L1, DLT-19L2, DLP-19L2, DLT-22L1, DLP-22L1, DLT-22L2, DLP-22L2 chassis SL-150T-150P


 The appearance of the MainBoard SL-130P is shown in the figure below:
SL-130P
SL-130P can be used in TVs:
DAEWOO DLP-20D7 (Panel LC201V02), DAEWOO DLP-20J3 (Panel LC201V02 (SD)(A3)), DAEWOO DLP-20J1 (Panel LC201V02-SDA3).
The appearance of the power supply
Main features of the DAEWOO DLP-20J3 device:
Installed matrix (LCD panel) LC201V02 (SD) (A3).
To power the backlight, a converter is used, combined with a power supply, controlled by the STR-H2003 PWM controller (24 pin). The transformer EFD1221B is installed in the inverter converter. As power elements of the inverter, keys of the APM4546 type (8 pin) are used.
The necessary supply voltages for all nodes of the DAEWOO DLP-20J3 TV are generated by the IPB-6015N01 power module, or its analogs using SRTW6253 microcircuits.
MainBoard - the main board (motherboard) is a SL-130P module, using 1501-B LOC-1, TDA9178T, LA42032 chips and others.
The UV1316A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V


 Brand: DAEWOO, Model: DLP-20J3.
Briefly from the TV: LCD, 20 ", 640x480, sound: 4 watts.
The composition uses the MainBoard SL-130P Main and the LCD panel (matrix) LC201V02 (SD) (A3).
Power Supply Unit (PSU) IPB-6015N01 RUS Ver04 Power Supply.
LCD TV DAEWOO DLP-20J3 with LCD display LC201V02, diagonal size 20 "4: 3 format. The brightness of the screen is 500 cd / m² backlight lamps CCFL (EEFL). The ratio of maximum brightness to minimum (contrast) is 700: 1 The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p.
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, S-Video, SCART. An output for connecting headphones is provided.
Overall dimensions: With stand 514x498x257 mm, Without stand 514x460x85 mm.
Attention! The DAEWOO DLP-20J3 LCD TV panel LC201V02 (SD) (A3) is the most expensive component of it.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
Posted By: FRANK at 06:32
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