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-19BX200

Technical description and composition of the TV SONY KDL-19BX200, type of panel and applicable modules. The composition of the modules.
SONY
Model: KDL-19BX200
Chassis / Version: AZ-1BK_5-3
Panel: M185XW01 V0
Inverter (backlight): VYA194G-07
PWM Inverter: FAN7314 (20)
MOSFET Inverter: FDD8778 FDD1141 (3)
Trans Inverter: HVT-276 050269G
Power Supply (PSU): VYA194G-07 1-474-241-21
PWM Power: CM0465R (6)
MainBoard: VYA190G-3 V-0 1-857-682-11
IC MainBoard: MSB1210-LF, MAX9736B, NT5TU32M16CG-25C
Tuner: HYB 9ZZ
Control: RM-ED037
Technical Specifications KDL-19BX200
SONY KDL-19BX200
General recommendations for repairing TV LCD
SONY KDL-19BX200 TV, like any others, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
In the case when the KDL-19BX200 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink lights and does not show any signs of operability, most likely in this case the VYA194G-07 1-474-241-21 power supply module is faulty. It is advisable to start the troubleshooting of the power supply module by checking the line fuse. If it is torn, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in a breakdown state in such situations.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors of the N-FET type fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the CMO465R PWM controller microcircuit (6) are subject to verification, which it is desirable to verify by replacement.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
In cases where the SONY KDL-19BX200 TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repair of the VYA194G-07 inverter is complicated by the fact that in case of any malfunction or emergency, even if the lamps are unevenly worn, protection is triggered, which turns it off for fire safety. Diagnostics become impossible and protection needs to be disabled.
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.
If the PRSM-3 motherboard is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MSB1210-LF MAX9736B.
The failure of the HYB 9ZZ tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Once again, remind users! Attempts to self-repair a SONY KDL-19BX200 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram ------------->   Sony KDL-19BX200, KDL-22BX200 CHASSIS    AZ1-BK(5-3).

MODELS::
KDL-19BX200; Panel: LC185WH1 TLG1; Power: 1-474-241-11 (147424111)
KDL-19BX200; Panel: LTM185AT01 R01; Power: 1-474-241-11 (147424111)
KDL-19BX200; Panel: LTM185AT01 R04; Power: 1-474-241-21 (147424121)
KDL-19BX200; Panel: M185B1-L02; Power: 1-474-241-21 (147424121)
KDL-19BX200; Panel: M185B1-L03; Power: 1-474-241-21 (147424121)
KDL-19BX200; Panel: M185XW01 V2; Power: 1-474-241-21 (147424121)



 The appearance of the MainBoard VYA190G-3 is shown in the figure below:
VYA190G-3
VYA190G-3 can be used in TVs:
SONY KDL-19BX200 (Panel M185XW01 V0), SONY KDL-22BX20D (Panel LTA216AT01).
The appearance of the power supply
Main features of the device SONY KDL-19BX200:
Installed matrix (LCD panel) M185XW01 V0.
The VYA194G-07 inverter is used to power the backlight lamps, it is controlled by the FAN7314 PWM controller (20). A transformer HVT-276 050269G is installed in the inverter converter. As power elements of the inverter, keys of the type FDD8778 FDD1141 (3) are used.
The necessary supply voltages for all nodes of the SONY KDL-19BX200 TV are generated by the VYA194G-07 power module or its analogs using CM0465R microcircuits (6).
MainBoard - the main board (motherboard) is a VYA190G-3 module, using microchips MSB1210-LF, MAX9736B, NT5TU32M16CG-25C and others.
The HYB 9ZZ tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 V0
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 07:35
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