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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Thursday 9 January 2020

REPAIR / SERVICING TV SAMSUNG UE40ES6750

Technical description and composition of the SAMSUNG UE40ES6750 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE40ES6750 MXRU
Chassis / Version: Ver: TE02
Panel: LTJ400HV08-L
LED driver (backlight): integrated into PSU; 163V 530mA (55 inch), 136V 530mA (46 inch)
PWM LED driver: SLC5012M = MAP3312B
MOSFET LED driver: KF9N25D
Power Supply (PSU): BN44-00520C
PWM Power: UCC25600 (PWM), SPC7011F (PFC = FA5695N), SQD2011K (STR2A151D Standby)
MainBoard: BN41-01807A BN94-05678J
IC MainBoard: CPU: WT61P805 (Standby); NAND Flash: KLM2G1HE3F-B001; DRAM: K4B2G1646C-HCK0; SOUND: NTP7412S
Tuner: BN40-00236A DNSD243VH144A
Technical Specifications UE40ES6750
SAMSUNG UE40ES6750
General repair guidelines for TV LCD LED
A malfunction of the power supply is often manifested corny - the TV does not turn on, does not make any sounds, does not light up and does not blink with any indicators. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
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 PWM chip UCC25600 (PWM), SPC7011F (FA5695N PFC), SQD2011K (STR2A151D Standby) from the manufacturer.
If the SAMSUNG UE40ES6750 does not have an image, but there is sound, there may be a malfunction of the backlight LEDs of the LTJ400HV08-L panel or their power converter - LED driver.
A malfunction in the backlight circuits often occurs due to a break in the power supply lines of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the soldering of their outputs, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
In cases of attempts to repair the motherboard BN41-01807A BN94-05678J, it is necessary to check the operability of the linear stabilizers and power converters of its microcircuits and, if possible, update the software (software). BGA chips can sometimes be diagnosed by local heating.
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: WT61P805 (Standby); NAND Flash: KLM2G1HE3F-B001; DRAM: K4B2G1646C-HCK0; SOUND: NTP7412S to new or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect a malfunction of the tuner BN40-00236A DNSD243VH144A, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Once again, remind users! Attempts to self-repair a SAMSUNG UE40ES6750 TV without the appropriate qualifications and experience can lead to its complete non-repairability !!!!!!!!!!!!!


PSU SCHEMATIC ---------------->  Power supply BN44-00520C.

SCHEMATIC MANUAL ------------------>  SAMSUNG Chassis U78A/U79A Model: UE**ES61***, UE**ES63***, UE**ES65***, UE**ES67***, UE**ES68***.




The appearance of the MainBoard BN41-01807A is shown in the figure below:
BN41-01807A
BN41-01807A can be used in TVs:
SAMSUNG UE40ES6550S (Panel LTJ400HV05-V), SAMSUNG UE46ES6547U UE46ES6547 (Panel LTJ460HW06-L), SAMSUNG UE40ES7207U (Panel LTJ400HL10-L), SAMSUNG UE46ES6540 UE46ES6540U (Panel LTJ460HW06-L), SAMSUNG UE40ES6750 MXRU (Panel LTJ400HV08-L), SAMSUNG UE32ES6727U UE32ES6727 (Panel LTJ320HW06-L), SAMSUNG UE40ES6757 UE40ES6757M (Panel LTJ400HV08-L), SAMSUNG UE32ES6550 UE32ES6550S (Panel LE320CSM-C1), SAMSUNG UE40ES6540S (Panel LTJ400HV07-L), SAMSUNG UE55ES6760 UE55ES6760SXZG (Panel LTJ550HW10-B), SAMSUNG UE32ES6540 UE32ES6540S (Panel LE320CSM-C1), SAMSUNG UE40ES6727 UE40ES6727U (Panel LTJ400HV08-L), SAMSUNG UE32ES6757M (Panel LE320CSM-C2).
PSU Advanced
The power module BN44-00520C is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on a PWM controller SPC7011F = FA5695N, 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 pulse amplitude (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 UE40ES6750 device:
Installed matrix (LED panel) LTJ400HV08-L.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the PWM controller SLC5012M = MAP3312B. As the power elements of the LED driver, keys of the KF9N25D type are used.
The necessary supply voltages for all nodes of the SAMSUNG UE40ES6750 television are generated by the BN44-00520C power supply module or its analogs using UCC25600 (PWM), SPC7011F (PFC = FA5695N), SQD2011K (STR2A151D Standby) microcircuits.
MainBoard - the main board (motherboard) is a BN41-01807A module, using CPU chips: WT61P805 (Standby); NAND Flash: KLM2G1HE3F-B001; DRAM: K4B2G1646C-HCK0; SOUND: NTP7412S and others.
The tuner BN40-00236A DNSD243VH144A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 08:02
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