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, 2 April 2020

REPAIR / SERVICING TV TOSHIBA 37SL833R

Technical description and composition of the TOSHIBA 37SL833R TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 37SL833R
Chassis / Version: PE0982
Panel: T370HF01 V.0
LED backlight: 74.37T08.001-0-SX1 110222, 37T07-01B
T-CON: T315HW07 V9 Ctrl BD, 31T14-C0A
LED driver (backlight): T315HW07.V8 led, 31T14-D04
PWM LED driver: MAX16814, RM5103
MOSFET LED driver: P3506DD, P1825AS
Power Supply (PSU): PSLF161502A V71A00021500 JQ10003
PWM Power: PWM
MainBoard: PE0982 V28A001292A1
IC MainBoard: TMPM330FYFG, D2817R, RTL8304, CS48540CQZ
Tuner: ENGS7305D5F
Control: IR: PE0961 V28A001261A1
Specifications 37SL833
TOSHIBA 37SL833R
General repair guidelines for TV LCD LED
If the TOSHIBA 37SL833R does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the PSLF161502A V71A00021500 JQ10003 power supply module. In some cases, only the processor power regulator may be faulty. After checking the mains fuse and power elements of the primary power supply circuit, it should also check the absence of a short circuit in the loads of the secondary rectifiers.
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, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the display backlight LEDs or the LED driver (power converter for the T370HF01 V.0 panel illumination unit).
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
To open all transitions, several tens of volts or more are necessary, and it is best to use a current source for such purposes. A break in the line of LEDs connected in series cannot be detected with a multimeter or tester without disassembling the panel. In the open panel, it is necessary to check each LED. If your multimeter cannot open the LED transitions in forward bias, then see the presence of the PN transition of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
Repair of the motherboard PE0982 V28A001292A1 must begin with the diagnosis and verification of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
When repairing an MB board, you need to check its components TMPM330FYFG, D2817R, RTL8304, CS48540CQZ. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
The malfunction of the ENGS7305D5F tuner is established after checking the software and all the 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 to the owners! Attempts to self-repair the TOSHIBA 37SL833R TV are not recommended by the manufacturer and can lead to serious negative consequences!
To reduce the backlight current in LED drivers with a PWM controller MAX16814 (TSSOP20 MAX16814B), it is necessary to proportionally increase the total resistance of the resistors from terminal 10 (SETI) to the housing. The maximum current in each of the four channels (in milliamps) for the resistance Rseti (in kilo-ohms) is determined from the ratio 1500 / Rseti.


The appearance of MainBoard PE0982 is shown in the figure below:
PE0982
PE0982 can be used in TVs:
TOSHIBA 42UL863R (Panel T420HF04 V.1 LED 75024795), TOSHIBA 46SL833R (Panel T460HF02 V.1), TOSHIBA 46UL863R (Panel T460HF02 V.1), TOSHIBA 37SL833R (Panel T370HF01 V.0), TOSHIBA 32SL833R (Panel T315HF01 V.0).
The appearance of the power supply
Key Features of the TOSHIBA 37SL833R:
Installed matrix (LED-panel) T370HF01 V.0.
The matrix control uses the Timing Controller (T-CON) T315HW07.
The LED driver T315HW07.V8 is used to power the backlight LEDs, it is controlled by the PWM controller MAX16814, RM5103. As power elements of the LED driver, keys of the type P3506DD, P1825AS are used.
The necessary supply voltages for all nodes of the TOSHIBA 37SL833R TV are generated by the PSLF161502A power supply module or its analogs using PWM microcircuits.
MainBoard - the main board (motherboard) is a PE0982 module, using TMPM330FYFG, D2817R, RTL8304, CS48540CQZ chips and others.
The ENGS7305D5F tuner provides TV reception and channel tuning.


Trademark: TOSHIBA, Model: 37SL833.
Briefly from the TV: LCD, LED backlight, 37 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 4, Internet access, Smart TV.
The Toshiba official website has firmware (software update) for the models 37SL833R (19.1.61.7), 37SL833N (19.1.49.236), 37SL833G (19.1.61.14), 37SL833F (19.1.49.236).
The composition uses MainBoard PE0982 V28A001292A1 and an LCD panel (matrix) T370HF01 V.0.
Power Supply Unit (PSU) PSLF161502A V71A00021500 Power Supply.
TOSHIBA 37SL833 LED TV with T370HF01 LCD, 37 "(94 cm) diagonal display in 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 4000: 1 Dynamic contrast ratio of 4,000,000: 1 is achieved by special control of the operation of the LEDs.This model uses side illumination from Edge LEDs.The design and technical capabilities of the TV include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels th in graphical expansion in standard 1080p (Full HD).
The 37SL833 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG.
The power of the sound system 20 W (2x10 W) provides 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 x3, component, SCART, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45). 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, 1360x768.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in the operating mode from the network is 97 watts.
Overall dimensions: with stand 873x590x258 mm, without stand 873x541x36 mm.
TV Weight: with stand: 14.5 kg, without stand: 11.2 kg.
Attention! The T370HF01 V.0 panel of the TOSHIBA 37SL833 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
Posted By: FRANK at 07:07
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