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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Tuesday 31 March 2020

REPAIR / SERVICING TV TOSHIBA 42X3000P

Technical description and composition of the TOSHIBA 42X3000P TV, panel type and applicable modules. The composition of the modules.
Toshiba
Model: 42X3000P 42X3000PR
Chassis / Version: PE0250A-1
Panel: V420H1-L08
Lamp backlight: 20 Lamp CCFL
Inverter (backlight): VIT70023.80
Power Supply (PSU): PE0282 (V28A00036301)
PWM Power: STR-Z4569, STR-W6765
MainBoard: PE0250 & PE0251
IC MainBoard: CPU: FLI8548H-LE. Audio: MPS 4410K
Tuner: ENG37E01GF
Specifications 42X3000P
TOSHIBA 42X3000P
General recommendations for repairing TV LCD
Possible malfunctions
- The TOSHIBA 42X3000P does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
With such manifestations, in some cases, the PE0282 power module is faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a 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 (OOS) stabilization circuits. PWM controllers (PWM) STR-Z4569, STR-W6765, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the 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 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 indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the PE0250 motherboard, you should start by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    TOSHIBA 42X3000P Chassis PE0250A-1


 The appearance of MainBoard PE0250 is shown in the figure below:
PE0250
The appearance of the power supply
Key Features of the TOSHIBA 42X3000P:
Installed matrix (LCD panel) V420H1-L08.
To power the backlight used inverter VIT70023.80.
The necessary supply voltages for all nodes of the TOSHIBA 42X3000P TV are generated by the PE0282 power module or its analogs using the STR-Z4569, STR-W6765 microcircuits.
MainBoard - the main board (motherboard) is a PE0250 module using CPU chips: FLI8548H-LE. Audio: MPS 4410K and others.
The ENG37E01GF tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V420H1-L08
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit), CIE1931 86%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
 Brand: TOSHIBA, Model: 42X3000P.
Short from TV: LCD, 42 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 2.
The composition includes MainBoard PE0250, PE0251 and LCD panel (matrix) V420H1-L08.
Power Supply Unit (PSU) PE0282 V28A00036301 Power Supply.
TOSHIBA 42X3000P LCD TV with V420H1-L08 LCD, 42 "(106 cm) diagonal size in 16: 9 format. The ratio of maximum brightness to minimum (contrast) is 1200: 1. Dynamic contrast ratio of 6000: 1 is achieved by special control of the backlight The design and technical capabilities of the TV provide for viewing broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Single processing and formation takes place in the digital signal standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound speaker system 20 W (2x10 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART x2, RGB, VGA, HDMI x2. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024.
The power consumed by the TV in the operating mode from the network is 241 watts.
Overall dimensions: with stand 1027x725x333 mm, without stand 1027x673x124 mm.
TV Weight: with stand: 27.45 kg, without stand: 24.95 kg.
Attention! The V420H1-L08 panel of the TOSHIBA 42X3000P LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
Posted By: FRANK at 06:53
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