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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 6 March 2020

REPAIR / SERVICING TV SONY KDL-32V2000

Technical description and composition of the TV SONY KDL-32V2000, type of panel and applicable modules. The composition of the modules.
SONY
Model: KDL-32V2000
Chassis / Version: WAX2
Panel: LTZ320WS-LH3
Inverter (backlight): PCB2737 - A06-126731 - CSN308-00 - 5
Trans Inverter: T831 / Y6K2
Power Supply (PSU): APS-220 1-869-132-31 1-468-980-12
PWM Power: FA5501AN (PFC), MIP2H2, CXD9841M
MainBoard: 1-869-852-12 (172723112) + 1-869-656-12 (172714512) + 1-869-850-25 (172723025)
IC MainBoard: S29AL016D70, MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG, 24C256
Tuner: BTD-HF431Z 1-869-657-12 BE TUE
Technical Specifications KDL-32V2000
SONY KDL-32V2000
General recommendations for repairing TV LCD
Possible malfunctions
- SONY KDL-32V2000 does not turn on, the indicators on the front panel do not light up and do not blink. The TV does not respond to the control buttons and the remote control.
In most of these cases, a malfunction is detected in the APS-220 power module. First of all, it is necessary to check the standby power converter assembled on a typical MIP2H2 PWM controller.
 In the absence of output voltages in the secondary circuits of other converters, it is necessary to check their power switches and rectifier diodes for a possible partial or complete breakdown.
The performance of the PFC node can be indirectly judged by the presence of an increased voltage (380-400V) on the network rectifier (electrolytic capacitor of the filter of the rectifier network).
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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.
PWM chips FA5501AN (PFC), MIP2H2, CXD9841M are checked by replacing with obviously good ones.
- 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 when working, 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 turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the motherboard 1-869-852-12 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - S29AL016D70, MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG, 24C256 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If you suspect a BTD-HF431Z 1-869-657-12 BE TUE tuner, it is first necessary to verify the correctness of the software, as well as the presence of the required voltage levels and the data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Attention! For users and owners of KDL-32V2000 TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual / schematic diagram -------------------> Sony APS-220 Power supply


 The appearance of MainBoard 1-869-852-12 is shown in the figure below:
1-869-852-12
1-869-852-12 can be used in televisions:
SONY KDL-26S2020 (Panel LTY260W2-L16), SONY KDL-32V2000 (Panel LTZ320WS-LH3).
The appearance of the power supply
Main features of the device SONY KDL-32V2000:
Installed matrix (LCD-panel) LTZ320WS-LH3.
A PCB2737 inverter is used to power the backlight. A transformer T831 / Y6K2 is installed in the inverter converter.
The necessary supply voltages for all nodes of the SONY KDL-32V2000 TV are generated by the APS-220 power supply module or its analogs using FA5501AN (PFC), MIP2H2, CXD9841M microcircuits.
MainBoard - the main board (motherboard) is a module 1-869-852-12, using microchips S29AL016D70, MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG, 24C256 and others.
The BTD-HF431Z 1-869-657-12 BE TUE tuner allows you to receive TV programs and tune to channels.
Additional technical information about the panel:
Brand: S-LCD
Model: LTZ320WS-LH3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA

Posted By: FRANK at 07:26
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