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 11 April 2020

REPAIR / SERVICING TV DAEWOO DSL-17W1T

Technical description and composition of the DAEWOO DSL-17W1T TV, panel type and applicable modules. The composition of the modules.
DAEWOO
Model: DSL-17W1T
Chassis / Version: SL-100P
Panel: LC171W03 (C4) // LM171W01-B3
Inverter (backlight): DS-1007WA // DS-1009WC // P1766-36A
PWM Inverter: BIT3105
Power Supply (PSU): Adapter 12V
MainBoard: SL-100P 97165M4001-03 LPP_Ver12
IC MainBoard: W166B-20T, 24C16, MSP3410G, LA4635
Tuner: TCPQ9091PD27E
Control: Remote: R-46K35
Technical Specifications DSL-17W1T
DAEWOO DSL-17W1T
General recommendations for repairing TV LCD
Possible malfunctions
- DAEWOO DSL-17W1T does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, in some cases, the Adapter power module is faulty.
The external adapter 12V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately 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 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 turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the SL-100P 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 W166B-20T, 24C16, MSP3410G, LA4635 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 TCPQ9091PD27E, if it is not possible to tune 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 DSL-17W1T 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 DSL-15D1T, DSL-17W1T chassis SL-100P

 The appearance of the MainBoard SL-100P is shown in the figure below:
SL-100P
SL-100P can be used in TVs:
DAEWOO DSL-15D1T (Panel SVA150XG10TB), DAEWOO DSL-17W1T (Panel LC171W03(C4)).
Main features of the DAEWOO DSL-17W1T device:
Installed matrix (LCD panel) LC171W03 (C4) or LM171W01-B3.
The DS-1007WA inverter is used to power the backlight, controlled by the BIT3105 PWM controller.
To power all the internal components of the DAEWOO DSL-17W1T TV, an external adapter 12V type source is used.
MainBoard - the main board (motherboard) is a SL-100P module, using chips W166B-20T, 24C16, MSP3410G, LA4635 and others.
The TCPQ9091PD27E tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC171W03-A4KG
Type: a-Si TFT-LCD, Panel
Diagonal size: 17.1 inch
Resolution: 1280x768, WXGA
Display Mode: Transmissive
Active Area: 372.48x223.488 mm
Display Colors: 16.7M
Frequency: 60Hz
Lamp Type: 6 pcs CCFL
Signal Interface: LVDS (1 ch, 8-bit)

 Brand: DAEWOO, Model: DSL-17W1T.
Shortly from the TV: LCD, 17 ", sound: 10 W.
The composition uses MainBoard SL-100P 97165M4001-03 LPP_Ver12 and LCD-panel (matrix) LC171W03 (C4), or LM171W01-B3.
Power supply unit external Adapter 12V.
DAEWOO DSL-17W1T LCD TV with LC171W03 (C4) LCD, 17 "diagonal size of 16: 9 format. 450 cd / m² screen brightness is provided by CCFL (EEFL) lamps. The ratio of maximum brightness to minimum (contrast) is 350: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC.
The power of the sound system 10 W (2x5W) provides 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.
Dimensions: With stand 608x456x215 mm, Without stand 944x529x115 mm.
Attention! The panel of the LC171W03 (C4) LCD TV DAEWOO DSL-17W1T is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen surface to prevent permanent damage to the LCD panel.
Posted By: FRANK at 05:08
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