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 LE37R41B

Technical description and composition of the SAMSUNG LE37R41B TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37R41B
Chassis / Version: GRO37KE
Panel: 1366x768 720p HD (LQ370T3LZ41 / LQ370T3LZ44)
T-CON: CPWBX3255TPZ
Inverter (backlight): RDENC2179TPZZ
Power Supply (PSU): BN41-00521B BN94-00622UJ
PWM Power: VIPER12ADIP, ICE1PCS02, STR-W6755
MOSFET Power: 20N60
MainBoard: BN41-00545D
IC MainBoard: MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32
Tuner: BN40-00051A
Specifications LE37R41B
SAMSUNG LE37R41B
General repair guidelines for TV LCD
Possible manifestations of defects
- The SAMSUNG LE37R41B TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
Usually with such manifestations, the defect is caused by faulty elements in the main power module BN41-00521B. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches (20N60) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits VIPER12ADIP, ICE1PCS02, STR-W6755 are usually checked by replacing with new ones, 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.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- 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 BN41-00545D 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the BN40-00051A tuner, if there is no tuning to the channels, first check the software and supply voltages at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention to users! Self-repair of a SAMSUNG LE37R41B TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!

Service manual and schematic diagram---------> SAMSUNG LE37R41B Chassis GRO37KE
FOR MODELS : ----> LE23R51B, LE26R51B, LE32R51B, LE32R52B, LE32R53B, LE40R51B, LE23R41B, LE26R41B, LE32R41B, LE37R41B.

PSU SCHEMATIC ----->  Samsung BN41-00521B Power supply.


The appearance of the MainBoard BN41-00545D is shown in the figure below:
BN41-00545D
BN41-00545D can be used in TVs:
SAMSUNG LE32R51 LE32R51BM S (Panel LTA320W2-L14), SAMSUNG LE32R51B (Panel LTA320W2-L01), SAMSUNG LE26R51B LE26R51BM (Panel LTA260W2-L11), SAMSUNG LE40R51B LE40R51BX (SAMSUNG LE40 LB2011BG01LB201LB201LB2301 Panel LTA2G01 LE37R41B (Panel 1366x768 720p HD (LQ370T3LZ41 / LQ370T3LZ44).
The appearance of the power supply
Main features of the SAMSUNG LE37R41B device:
Installed matrix (LCD panel) 1366x768 720p HD (LQ370T3LZ41 / LQ370T3LZ44).
The matrix control uses the Timing Controller (T-CON) CPWBX3255TPZ.
An RDENC2179TPZZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SAMSUNG LE37R41B TV are generated by the BN41-00521B power module or its analogs using VIPER12ADIP, ICE1PCS02, STR-W6755 microcircuits and 20N60 type power switches.
MainBoard - the main board (motherboard) is a BN41-00545D module, using microcircuits MST9838, M30620SPGP, FST3125M, TPA3004D2, K4D263238E-GC36, 24C32 and others.
The tuner BN40-00051A provides the reception of television programs and tuning to channels.

Posted By: FRANK at 07:29
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