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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Tuesday 7 January 2020

REPAIR / SERVICING TV SAMSUNG UE37D5500

Technical description and composition of the SAMSUNG UE37D5500 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE37D5500 RW
Chassis / Version: U66A / Ver: CN01
Panel: LD370BGB-C1
T-CON: T315HW04 V.B CTRL BD
LED driver (backlight): integrated into PSU
PWM LED driver: SLC3011M
Power Supply (PSU): BN44-00422B PD46AD-BDY
PWM Power: 3BR1765JZ (Standby), 1HS01G (PWM resonant), FA5591N (PFC)
MainBoard: BN41-01660B (BN94-05225V)
IC MainBoard: SEMS21 1108A-LF, K9GAG08U0E
Tuner: BN40-00196A
Technical Specifications UE37D5500
SAMSUNG UE37D5500
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE37D5500 does not turn on and does not show any signs of operability. Does not blink indicators and does not respond to any control buttons.
With such manifestations, a malfunction is most likely to be detected in the BN44-00422B power module. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
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, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip 3BR1765JZ (Standby), 1HS01G (PWM resonant), FA5591N (PFC) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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.
- The indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-01660B 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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its SEMS21 1108A-LF, K9GAG08U0E chips and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-00196A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention to users! Self-repair of a SAMSUNG UE37D5500 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!

SCHEMATICS --------------->  Samsung UE37D5500 Chassis U66A.

Chassis : U66A Model : UE32D55**R*, UE37D55**R*, UE40D55**R*, UE46D55**R*, UE32D57**RS, UE37D57**RS, UE40D57**RS, UE46D57**RS.
Chassis : U57A Model : UE32D50**PW, UE37D50**PW, UE40D50**PW, UE46D50**PW, UE32D40**NW.
Chassis : U57B Model : UE19D40**NW, UE22D50**NW, UE27D50**NW

 The appearance of the MainBoard BN41-01660B is shown in the figure below:
BN41-01660B
BN41-01660B can be used in TVs:
SAMSUNG UE40D5500 UE40D550K1W UE40D5500RW (Panel LD400BGB-A2), SAMSUNG UE37D5520RW UE37D5520 (Panel LD370BGB-C1), SAMSUNG UE37D5500 RW (Panel LD370BGB-C1).
The appearance of the power supply
Main features of the SAMSUNG UE37D5500 device:
Installed matrix (LED panel) LD370BGB-C1.
The matrix control uses the Timing Controller (T-CON) T315HW04.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the SLC3011M PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG UE37D5500 TV are generated by the BN44-00422B power module or its analogs using 3BR1765JZ (Standby), 1HS01G (PWM resonant), FA5591N (PFC) microcircuits.
MainBoard - the main board (motherboard) is a BN41-01660B module, using microchips SEMS21 1108A-LF, K9GAG08U0E and others.
The tuner BN40-00196A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 08:39
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