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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Thursday 5 March 2020

REPAIR / SERVICING TV SONY KDL-20S2000

Technical description and composition of the SONY KDL-20S2000 TV, panel type and applicable modules. The composition of the modules.
SONY
Model: KDL-20S2000
Chassis / Version: SE-1
Panel: V201B1-L01
T-CON: V201B1-C
Inverter (backlight): PWB-IV55194T / B3-E-LF Sumida 6 lights
PWM Inverter: BD9884FV
MOSFET Inverter: 4541C
Power Supply (PSU): 1-870-636-11 - 1-727-578-11 - A-1189-417-A G3
PWM Power: MCZ3001DB, STR-A6169
MOSFET Power: 2SK3469
MainBoard: 1-870-688-13 + 1-870-681-11
IC MainBoard: VCT6973G 24C32 TDA9974AHS / 8/12, D61123F1, HY27US08281A
Tuner: BTP-HC401 1-870-681-11 - 1-727-575-11
Technical Specifications KDL-20S2000
SONY KDL-20S2000
General recommendations for repairing TV LCD
Like any other TV, SONY KDL-20S2000 should start repairing with an external inspection for visible changes in external and internal elements. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Malfunctions of the A-1194-498-A power supply module can be expressed in different ways, for example, the SONY KDL-20S2000 does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the SONY KDL-20S2000 does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
Often attempts to repair the inverter of the PWB-IV55194T / B3-E-LF Sumida 6 lamps are complicated by the fact that the diagnosis of the malfunction is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations . Lock protection to localize the defect is popular among repairmen.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
Attention to the owners! Attempts to repair the TV SONY KDL-20S2000 on your own are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram ------------->   Sony KDL-20S2000, KDL-20S2020 CHASSIS  SE-1



 The appearance of MainBoard 1-870-688-13 is shown in the figure below:
1-870-688-13
1-870-688-13 can be used in TVs:
SONY KDL-15G2000 (Panel CLAA150XP07Q), SONY KDL-20S2000 (Panel V201B1-L01), SONY KDL-26U2000 (Panel T260XM02 V6).
The appearance of the power supply
Main features of the device SONY KDL-20S2000:
Installed matrix (LCD panel) V201B1-L01.
The matrix control uses the Timing Controller (T-CON) V201B1-C.
To power the backlight, an inverter PWB-IV55194T is used, it is controlled by the BD9884FV PWM controller. As power elements of the inverter, keys of type 4541C are used.
The necessary supply voltages for all nodes of the SONY KDL-20S2000 TV are generated by the power module 1-870-636-11, or its analogs using microchips MCZ3001DB, STR-A6169 and power switches of the type 2SK3469.
MainBoard - the main board (motherboard) is a module 1-870-688-13, using VCT6973G 24C32 TDA9974AHS / 8/12, D61123F1, HY27US08281A and others.
Tuner BTP-HC401 1-870-681-11 - 1-727-575-11 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V201B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 444.633x249.984 mm
Surface: Antiglare (Haze 40%), Hard coating (3H), Reflection 2.0% (Max.)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 75%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 5 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 07:46
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