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 LE37C530F1W

Technical description and composition of the SAMSUNG LE37C530F1W TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37C530F1W
Panel: T370HW03 VG xxxxG
T-CON: T370HW03 VB CTRL BD // T460HW03 VF CTRL BD. (46T03-C09)
Inverter (backlight): V298-502HF 4H.V2988.071-A1 // V298-502 (4H.V2988.071-A2)
PWM Inverter: OZ9937GN
MOSFET Inverter: N5100V
Power Supply (PSU): BN44-00339B - P3237F1_AHS
PWM Power: FSFR1700US, FAN7530 (PFC), STR-A6052 (Standby)
MOSFET Power: SD10N60
MainBoard: BN41-01536A BN94-04176U // BN41-01479A
IC MainBoard: WT61P802, SETD-70, 24C256C, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S
Tuner: BN40-00173A - DTOS40CVL081A
Control: Remote: BN59-01014A, IR: BN96-13022B
Technical Specifications LE37C530
SAMSUNG LE37C530F1W
General repair guidelines for TV LCD
Repair of the SAMSUNG LE37C530F1W TV should begin with a fault diagnosis, which involves a careful inspection of the external and internal elements of the device. Many visible changes in the state of the elements make it possible to determine the future direction of the troubleshooting. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If SAMSUNG LE37C530F1W does not turn on, no control lights on the front panel light up and do not blink, therefore, there is a very high probability of a fault in the power module BN44-00339B - P3237F1_AHS. In some cases, only the processor power regulator may be faulty. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective chip PWM FSFR1700US, FAN7530 (PFC), STR-A6052 (Standby) from the manufacturer.
If there is no image when you turn on the SAMSUNG LE37C530F1W, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. It should be remembered that when protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the inverter power elements. After repair, it is imperative to restore all standard converter protection circuits.
Repair or diagnostics of the BN41-01479A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - WT61P802, SETD-70, 24С256С, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S. Defective components should be replaced.
Before changing the tuner BN40-00173A - DTOS40CVL081A, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners of the LE37C530F1W TV are recommended to repair only qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!


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



The appearance of the MainBoard BN41-01536A is shown in the figure below:
BN41-01536A
BN41-01536A can be used in TVs:
SAMSUNG LE37C530F1W (Panel T370HW03 VG xxxxG), SAMSUNG LE37C550J1W (Panel T730HW03), SAMSUNG LE32C454 LE32C454E3W (Panel LTF320AP08), SAMSUNG LE26C454 LE26C454E36004 Panel.
PSU Advanced
The power module BN44-00339B is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on the FAN7530 PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of the increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the SAMSUNG LE37C530F1W device:
Installed matrix (LCD panel) T370HW03 VG xxxxG.
The matrix control uses the Timing Controller (T-CON) T370HW03.
To power the backlight used inverter V298-502HF, controlled by a 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 LE37C530F1W TV are generated by the BN44-00339B power supply module or its analogs using the FSFR1700US, FAN7530 (PFC), STR-A6052 (Standby) microcircuits and power switches of the SD10N60 type.
MainBoard - the main board (motherboard) is a BN41-01536A module, using microchips WT61P802, SETD-70, 24С256С, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S and others.
Tuner BN40-00173A - DTOS40CVL081A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 07:00
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