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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Friday, 27 December 2019

REPAIRING / SERVICING TV SAMSUNG LE37B550

Technical description and composition of the SAMSUNG LE37B550 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37B550 LE37B550A5W
Chassis / Version: N68A
Panel: T370HW02 V.C
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2005 / BD9893
MOSFET Inverter: 5N50
Trans Inverter: LT-HU37
Power Supply (PSU): BN44-00262A H37F1-9SS PSIV181E01A
PWM Power: FAN7530 (PFC), ICE3BR0665J
MOSFET Power: STF13NM60N (PFC), 6N60
MainBoard: BN41-01258B BN94-02766J
IC MainBoard: CPU: SEMS12, EEPROM: 24C1024, SPI FLASH: 25L6405DMI
Tuner: BN40-00137A DNOQ403SH151A (S)
Control: IR: BN41-01194A REV: V1.0, Sensor: BN41-01192A BN96-10382B
Technical specifications LE37B550
SAMSUNG LE37B550
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE37B550 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the malfunction should be sought first in the BN44-00262A power supply module. It is necessary to measure its output voltages, and if they are absent, check the operability of power switches (STF13NM60N (PFC), 6N60) of converters and rectifier diodes for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN7530 (PFC), ICE3BR0665J, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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 inverter. If all the electrolytic capacitors of the filter for the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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 operations, and after their completion, 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-01258B motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software).
Before replacing the tuner BN40-00137A DNOQ403SH151A (S), if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Owners and users of the SAMSUNG LE37B550 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!

Service manual and schematic diagram SAMSUNG LE37B550 Chassis N68A.



 The appearance of the MainBoard BN41-01258B is shown in the figure below:
BN41-01258B
The appearance of the power supply
Main features of the SAMSUNG LE37B550 device:
Installed matrix (LCD panel) T370HW02 V.C.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller SEM2005 / BD9893. A transformer LT-HU37 is installed in the inverter converter. As power elements of the inverter, keys of the 5N50 type are used.
The necessary supply voltages for all nodes of the TV SAMSUNG LE37B550 are generated by the power module BN44-00262A, or its analogs using microchips FAN7530 (PFC), ICE3BR0665J and power switches of the type STF13NM60N (PFC), 6N60.
MainBoard - the main board (motherboard) is a BN41-01258B module using CPU chips: SEMS12, EEPROM: 24C1024, SPI FLASH: 25L6405DMI and others.
The tuner BN40-00137A DNOQ403SH151A (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T370HW02 VC
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 06:47
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