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 LE37A330J1

Technical description and composition of the SAMSUNG LE37A330J1 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37A330J1
Chassis / Version: GJE26SE
Panel: CLAA370WA03 SJ
T-CON: CPT 370WA03C
Inverter (backlight): 4H.V1838.491-B1 BAT30370T40A-B CPT 370WA03S
PWM Inverter: OZ964SN
Power Supply (PSU): BN44-00220A
PWM Power: TDA4863G (PFC), STR-A6159 (Standby), MC33067P
MOSFET Power: FQPF9N50C, FCPF20N60S
MainBoard: BN41-00982B BN94-02404B
IC MainBoard: CPU: SAMS01, DRAM: EM6A9160TSOA-5G, SPI Flash: MX25L1605AM2I-12G, EEPROM: 24C256
Tuner: BN40-001116A
Control: IR: BN41-00850a
Technical Specifications LE37A330J1
SAMSUNG LE37A330J1
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE37A330J1 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.
With similar manifestations, in some cases, the BN44-00220A power module is faulty. It is necessary to measure its output voltages and, if they are absent, check the power switches (FQPF9N50C, FCPF20N60S) and rectifier diodes for the probability of short circuit in the converters.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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 chips TDA4863G (PFC), STR-A6159 (Standby), MC33067P are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
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 turn on, the indicator signals standby or working mode, or blinks.
Repair or diagnostics of the BN41-00982B 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 CPU elements: SAMS01, DRAM: EM6A9160TSOA-5G, SPI Flash: MX25L1605AM2I-12G, EEPROM: 24C256. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-001116A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners of the LE37A330J1 TV are recommended to repair only qualified specialists with the necessary work experience! Attempts to repair it yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!

SCHEMATIC ---->  SAMSUNG Chassis : GJE26SE*, GJE32SE*, GJE37SE*, GJE40SE*; Model : LE26A33*J**, LE32A33*J**, LE37A33*J**, LE40A33*J**, LE32A33*J*N**.

SCHEAMATIC OF PSU ---->  Power supply BN44-00220A.


 The appearance of the MainBoard BN41-00982B is shown in the figure below:
BN41-00982B
BN41-00982B can be used in TVs:
SAMSUNG LE32A330J1 (Panel T320HA01-AA), SAMSUNG LE32A430T1 (Panel V315B1-L01), Samsung Panel V260B1-L13), SAMSUNG LE37A330J1 (Panel CLAA370WA03 SJ), SAMSUNG LE26A340J3 (Panel V260B1-L13).
The appearance of the power supply
Main features of the SAMSUNG LE37A330J1 device:
Installed matrix (LCD panel) CLAA370WA03 SJ.
The matrix control uses the Timing Controller (T-CON) CPT.
To power the backlight, an inverter 4H.V1838.491-B1 is used, it is controlled by the OZ964SN PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG LE37A330J1 TV are generated by the BN44-00220A power module or its analogs using TDA4863G (PFC), STR-A6159 (Standby), MC33067P microcircuits and power switches of the FQPF9N50C, FCPF20N60S type.
MainBoard - the main board (motherboard) is a BN41-00982B module using CPU chips: SAMS01, DRAM: EM6A9160TSOA-5G, SPI Flash: MX25L1605AM2I-12G, EEPROM: 24C256 and others.
The tuner BN40-001116A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 06:07
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