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 UE40ES7207U

Technical description and composition of the SAMSUNG UE40ES7207U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE40ES7207U
Chassis / Version: TEO1
Panel: LTJ400HL10-L
T-CON: BN95-00582C (BN41-01790C BN97-06374C) LSJ400HL02-S
LED driver (backlight): integrated into PSU; 135V 700mA
PWM LED driver: SLC5012M
MOSFET LED driver: F9N25, K8A500D
Power Supply (PSU): BN44-00522B PD46B2Q_CDY
PWM Power: UCC25600, PC7011F (PFC = FA5695N), 2A153D (Standby)
MOSFET Power: K8A50D, MDF11M60 (PFC)
MainBoard: BN41-01807A - BN9405578N
IC MainBoard: CPU: WT61P805 (Standby); NAND Flash: KLM2G1HE3F-B001; DRAM: K4B2G1646C-HCK0; SOUND: NTP7412S
Tuner: BN40-00238B DNTD243VH144AA
Control: Bluetooth: BN96-21431C (WIBT30A)
Appearance
SAMSUNG UE40ES7207U
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the SAMSUNG UE40ES7207U does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the power supply BN44-00522B PD46B2Q_CDY of the TV. After checking the mains fuse and power elements of the primary power supply circuit, you should also check for the presence of a short circuit in the loads of the secondary rectifiers.
The breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
In cases where the SAMSUNG UE40ES7207U TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (converter for powering the backlight LEDs of the LTJ400HL10-L panel). When you turn on the TV, the image may appear briefly and disappear. It must be borne in mind that with such manifestations the LEDs themselves also fail.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a malfunction, the zener diode PN junction will either be cut off or broken into short-circuit.
Repair or diagnostics of the motherboard BN41-01807A - BN9405578N should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update the software (software).
When repairing an MB board, you need to check its CPU components: WT61P805 (Standby); NAND Flash: KLM2G1HE3F-B001; DRAM: K4B2G1646C-HCK0; SOUND: NTP7412S. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
The failure of the tuner BN40-00238B DNTD243VH144AA is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention to users! Self-repair of a SAMSUNG UE40ES7207U TV without the appropriate qualifications and experience can lead to its complete non-repairability!

SCHEMATIC MANUAL PSU -------------->  Power supply BN44-00522B.


 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
In the UE40ES7207U TV, the BN44-00522B power module is installed using the PFC (Power Factor Correction) circuit acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the PC7011F = FA5695N PWM controller does not allow the input rectifier filter's electrolytic capacitor 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 UE40ES7207U device:
Installed matrix (LED-panel) LTJ400HL10-L.
The matrix control uses the Timing Controller (T-CON) BN95-00582C.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the SLC5012M PWM controller. As power elements of the LED driver, keys of the type F9N25, K8A500D are used.
The necessary supply voltages for all nodes of the SAMSUNG UE40ES7207U TV are generated by the BN44-00522B power module or its analogs using UCC25600, PC7011F (PFC = FA5695N), 2A153D (Standby) microcircuits and K8A50D, MDF11M60 (PFC) type power switches.
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 BN40-00238B DNTD243VH144AA provides the reception of television programs and tuning to channels.

 
Posted By: FRANK at 08:09
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