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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Sunday, 22 December 2019

REPAIRING / SERVICING TV SAMSUNG LE26C450E1WXRU

Technical description and composition of the SAMSUNG LE26C450E1WXRU TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE26C450E1WXRU LE26C450E1W
Chassis / Version: N65C
Panel: LTF260AP04
T-CON: 26AP04S4LV0.3
Inverter (backlight): SS1260_4UC01
PWM Inverter: SSI1091ASN
MOSFET Inverter: AOD4186
Trans Inverter: LT-U2632
Power Supply (PSU): BN44-00338B
PWM Power: ICE3BR1765J (Standby), FAN7530 (PFC), FSFR1700US
MOSFET Power: 13N60N, MDS1653
MainBoard: BN41-01331B or BN41-01479A
IC MainBoard: WT61P802, SETD-70, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S
Tuner: DTOS40CVL081A BN40-00173A
Control: TM950, AA59-00483A; IR: BN96-13046D (BN41-01366A)
Specifications LE26C450
SAMSUNG LE26C450E1WXRU
General repair guidelines for TV LCD
It is advisable to start any repair and diagnostics of the SAMSUNG LE26C450E1W X (RU) TV with a careful external examination of the internal and external elements, including case parts, the display, buttons and cables. Sometimes, with some visible changes, you can determine the further direction of the defect search and localization of the malfunction before the start of the acquisition of oscillograms and the necessary measurements at the control points. Ring cracks in the soldering of the leads of the elements, deformed electrolytic capacitors, charred resistors - all this for the repairman can be a hint in assumptions about the causes and consequences of the malfunction.
Faults in the BN44-00338B power supply module can be expressed in different ways, for example, SAMSUNG LE26C450E1W does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it is broken, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate heatsink, or integrated with the ICE3BR1765J, FAN7530, FSFR1700US PWM controller in a single chip, are quite reliable and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known good one.
The circuitry of the BN44-00338B power supply unit provides for the use of the Active Power Factor Correction (CMC) circuit, another abbreviation for PFC (Power Factor Correction). Troubleshooting in such cases is somewhat more complicated and requires certain knowledge and skills. Details and recommendations for repairing such modules will be considered separately.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when turned on, but there are sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
On the motherboard BN41-01331B or BN41-01479A, in the event of a malfunction, you should first check the operation of all the power stabilizers of the microcircuits and, if necessary, update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - WT61P802, SETD-70, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S, Tuner: DTOS40CVL081A (BN40-00173A), and replace the failed chips with new or obviously working ones.
Owners and users of the SAMSUNG LE26C450 TV must 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!

The appearance of the MainBoard BN41-01331B is shown in the figure below:
BN41-01331B
BN41-01331B can be used in TVs:
SAMSUNG LA32C450 (Panel LFT320AP08), SAMSUNG LA32C450E1D (Panel LTF320AP08 A10), SAMSUNG LE26C450E1WXRU (Panel LTF260AP04), SAMSUNG LE32C530F1 LE32C53051F5W5405L Panel, LTF320HMF150, SAML5505F150, Panel LTF320HMF150
PSU Advanced
The LE26C450E1WXRU TV is equipped with a BN44-00338B power module using the PFC (Power Factor Correction) circuitry acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the FAN7530 PWM controller does not allow the electrolytic capacitor of the input rectifier filter to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the SAMSUNG LE26C450E1WXRU device:
Installed matrix (LCD panel) LTF260AP04.
The matrix control uses the Timing Controller (T-CON) 26AP04S4LV0.3.
To power the backlight, an SS1260_4UC01 inverter is used, controlled by the SSI1091ASN PWM controller. A transformer LT-U2632 is installed in the inverter converter. As power elements of the inverter, keys of the AOD4186 type are used.
The necessary supply voltages for all nodes of the TV SAMSUNG LE26C450E1WXRU are generated by the power module BN44-00338B, or its analogs using ICE3BR1765J (Standby), FAN7530 (PFC), FSFR1700US and power switches type 13N60N, MDS1653.
MainBoard - the main board (motherboard) is a module BN41-01331B, using microchips WT61P802, SETD-70, K4T1G164QE-HCF8, KFG1G16U20K, NTP-7300S and others.
The tuner DTOS40CVL081A BN40-00173A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 06:01
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