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 LE37C650L1W

Technical description and composition of the SAMSUNG LE37C650L1W TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37C650L1W LE37C650
Chassis / Version: N84A
Panel: T370HW03 VH
Inverter (backlight): 4H.V2988.071 / A1 V298-502HF 03J
PWM Inverter: OZ9937GN
MOSFET Inverter: N5100V
Power Supply (PSU): BN44-00339B
PWM Power: FAN7530 (PFC), STR-A6052 (Stb), FSFR1700US
MOSFET Power: SD10N60
MainBoard: BN41-01443A
IC MainBoard: SDP92, WT61P802, K4T1G084QE, K4T51163QG, KFG8GH6U4M, sil9287BCNU
Tuner: BN40-00173A DTOS40CVL081A
Technical specifications LE37C650
SAMSUNG LE37C650L1W
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE37C650L1W does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Most often, with such manifestations, the main power module BN44-00339B is found to be faulty. It is necessary to measure its output voltages and, if they are absent, check the power switches (SD10N60) and rectifier diodes for the probability of short circuit in the converters.
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 chips FAN7530 (PFC), STR-A6052 (Stb), FSFR1700US are usually 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of 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 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-01443A 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - SDP92, WT61P802, K4T1G084QE, K4T51163QG, KFG8GH6U4M, sil9287BCNU. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before replacing the BN40-00173A DTOS40CVL081A tuner, 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
Once again, remind users! Attempts to self-repair a SAMSUNG LE37C650L1W TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!


SCHEMATICS --->: Service manual SAMSUNG LE32C63*, LE37C63*, LE40C63*, LE46C63*, LE32C65*, LE37C65*, LE40C65*, LE46C65*, LE55C65*, LE32C67*, LE37C67*, LE40C67*, LE46C67*, LE55C67* Chassis N84A.

PSU SHCEMATICS ---->  BN44-00339B Power supply.

FIRMWARE ----->  WT61P802 SAMSUNG LE32C630 Weltrend WT61P802


 The appearance of the MainBoard BN41-01443A is shown in the figure below:
BN41-01443A
BN41-01443A can be used in TVs:
SAMSUNG LE40C630 LE40C630K1W (Panel LTF400HF16), SAMSUNG LE37C650L1W LE37C650 (Panel T370HW03 VH), SAMSUNG LE55C650 LE55C650L1W (Panel T546HW01 V.0).
The appearance of the power supply
Main features of the SAMSUNG LE37C650L1W device:
Installed matrix (LCD panel) T370HW03 VH.
To power the backlight, an inverter 4H.V2988.071 is used, it is controlled by the PWM controller OZ9937GN. As power elements of the inverter, keys of the N5100V type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE37C650L1W TV are generated by the BN44-00339B power supply module or its analogs using FAN7530 (PFC), STR-A6052 (Stb), FSFR1700US microchips and power switches of the SD10N60 type.
MainBoard - the main board (motherboard) is a BN41-01443A module, using microchips SDP92, WT61P802, K4T1G084QE, K4T51163QG, KFG8GH6U4M, sil9287BCNU and others.
Tuner BN40-00173A DTOS40CVL081A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T370HW03 VH
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 07:12
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