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 26 March 2020

REPAIR / SERVICING TV TOSHIBA 22SLDT3WR

Technical description and composition of the TOSHIBA 22SLDT3WR TV, type of panel and applicable modules. The composition of the modules.
Toshiba
Model: 22SLDT3WR
Chassis / Version: CMH143
Panel: V216B1-L01
PWM Inverter: MP1008-ES-LF-Z
Power Supply (PSU): CEH433B
PWM Power: FA5571N-D1
MOSFET Power: 2SK3532-01MR
MainBoard: CMH143 PCBF40
IC MainBoard: LA42052-E, BD9323EFJ DC-DC, BD7820FP-E2, NJM4565M, MM1501XNRE, DVD A52C01T650 DAV-RR933WR
Tuner: TDTG-S486D
Control: CEH437B
Technical Specifications 22SLDT3W
TOSHIBA 22SLDT3WR
General recommendations for repairing TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of operations for their dismantling. Often, by the visible signs of a change in the state of some elements, one can judge the causes of the defect. If ring cracks are detected in the soldered terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
In the case when the 22SLDT3WR does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the CEH433B power supply module is probably defective in this case. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power key (s) of the 2SK3532-01MR converter. The complete inoperability of the power supply unit can be caused by a short circuit in the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the TOSHIBA 22SLDT3WR does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
If the motherboard CMH143 PCBF40 is faulty, first of all it is necessary to check all the linear stabilizers and power converters of its chips, as well as, if necessary, update the software (software). Sometimes you can check the health of MB only by replacement. In some cases, it is necessary to check or replace (if necessary) the elements of the MainBoard board - LA42052-E, BD9323EFJ DC-DC, BD7820FP-E2, NJM4565M, MM1501XNRE, DVD A52C01T650 DAV-RR933WR. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The TDTG-S486D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention! For users and owners of 22SLDT3WR TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.

 SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    19SLDT3, 22SLDT3. DMH104A, CMH143A, CEH447A, CEH434A, CEH433B



 The appearance of the MainBoard CMH143 is shown in the figure below:
CMH143
CMH143 can be used in TVs:
TOSHIBA 19SLDT3RW (Panel M185XW01 V0), TOSHIBA 22SLDT3R (Panel 22 inch), TOSHIBA 22SLDT3W (Panel M185XW01 V0), TOSHIBA 22SLDT3WR (Panel V216B1-L01).
Main features of the TOSHIBA 22SLDT3WR device:
Installed matrix (LCD panel) V216B1-L01.
A converter controlled by the MP1008-ES-LF-Z PWM controller is used to power the backlight lamps.
The necessary supply voltages for all nodes of the TOSHIBA 22SLDT3WR TV are generated by the CEH433B power supply module or its analogs using FA5571N-D1 microchips and power switches of the 2SK3532-01MR type.
MainBoard - the main board (motherboard) is a CMH143 module, using microcircuits LA42052-E, BD9323EFJ DC-DC, BD7820FP-E2, NJM4565M, MM1501XNRE, DVD A52C01T650 DAV-RR933WR and others.
The TDTG-S486D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V216B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 477.417x268.416 mm
Brightness: 400 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 08:30
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