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-20J1

Technical description and composition of the DAEWOO DLP-20J1 TV, type of panel and applicable modules. The composition of the modules.
DAEWOO
Model: DLP-20J1
Chassis / Version: SL-130P
Panel: LC201V02-SDA3
Inverter (backlight): integrated into PSU
PWM Inverter: STR-H2003 (24 pin)
Power Supply (PSU): IPB-6015N02 ver02
PWM Power: SRTW6253
MOSFET Power: FSFD5A20 (diod) HF6AH (pl) 8n
MainBoard: SL-130P Main
IC MainBoard: 1501-B LOC-1, TDA9178T, LA42032
Tuner: UV1316 / A
Control: approach R44C13
Technical Specifications DLP-20J1
DAEWOO DLP-20J1
General recommendations for repairing TV LCD
Possible manifestations of defects
- DAEWOO DLP-20J1 does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
Failure in such cases should be sought in the power supply circuits IPB-6015N02. It is necessary to measure its secondary output voltage, and in case of their absence, check the serviceability of power switches (FSFD5A20 (diod) HF6AH (pl) 8n) of 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 a short circuit in the elements of the primary circuit, the mains 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 switch may be PWM (PWM) SRTW6253. It is checked only by replacement with a known good one.
- 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 to 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 during work, 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 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements 1501-B LOC-1, TDA9178T, LA42032. BGA chip malfunctions are usually easy to detect by warming up.
Before changing the tuner UV1316 / A, 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
It should be remembered! Attempts to independently repair the DAEWOO DLP-20J1 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  / SERVICE MANUAL   ------------------>   DAEWOO DLP-20J1, DLP-20D7, DLP-20W2 chassis SL-130P

 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-20J1 device:
Installed matrix (LCD panel) LC201V02-SDA3.
To power the backlight, a converter is used, combined with a power supply, controlled by the STR-H2003 PWM controller (24 pin).
The necessary supply voltages for all nodes of the DAEWOO DLP-20J1 TV are generated by the IPB-6015N02 power supply module or its analogs using SRTW6253 microchips and power switches of the type FSFD5A20 (diod) HF6AH (pl) 8n.
MainBoard - the main board (motherboard) is a SL-130P module, using 1501-B LOC-1, TDA9178T, LA42032 chips and others.
The UV1316 / A tuner provides television 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-20J1.
Short from TV: LCD, 20 ", 640x480.
The composition uses the MainBoard SL-130P Main and the LCD panel (matrix) LC201V02-SDA3.
Power Supply Unit (PSU) IPB-6015N02 ver02 Power Supply.
LCD TV DAEWOO DLP-20J1 with LCD display LC201V02-SDA3, diagonal size 20 "in 4: 3 format. The brightness of the screen is 500 cd / m² with CCFL (EEFL) lamps. The ratio of maximum brightness to minimum (contrast) is 700 : 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i. Stereo sound is realized by two built-in 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, SCART, RGB, VGA. An output for connecting headphones is provided. A VGA (D-Sub 15) connector is used to connect a computer or laptop. This interface supports resolutions: 640x480.
Dimensions: With stand 608x456x215 mm, Without stand 944x529x115 mm.
Attention! The DAEWOO DLP-20J1 LCD TV panel LC201V02-SDA3 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 06:23
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