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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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 LE37M87BD

Technical description and composition of the SAMSUNG LE37M87BD TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE37M87BD LE37M87B
Chassis / Version: GTU37SEN
Panel: T370HW02 V.2
T-CON: T370HW02 V0 AUO 06A22-1B AUO-024, BD815FFV, EM6A9320BI-5MG, AS15-F, 24C64WI
Inverter (backlight): 4H.V1838.461 / B V183 DARFON
PWM Inverter: OZ964SN
Trans Inverter: 6024B73DB14 (GP)
Power Supply (PSU): BN44-00157A
PWM Power: TDA4863-2 (PFC), VIPer22A (Standby), F9222L (PWM resonant)
MainBoard: BN41-00813E BN94-01206A
IC MainBoard: MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000
Tuner: BN40-00096A DN0S403MH261B (S)
Control: Remote: BN59-00603A; IR BN41-00850A
Technical Specifications LE37M87BD
SAMSUNG LE37M87BD
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE37M87BD TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Failure in such cases should begin to be sought in the power supply circuits BN44-00157A. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converters for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency-setting or damper ones, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) TDA4863-2 (PFC), VIPer22A (Standby), F9222L (PWM resonant), if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during operations, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-00813E 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000. Defective components should be replaced.
If the TV operates normally from external devices but does not tune into television channels, the tuner BN40-00096A DN0S403MH261B (S) may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
TV users and owners need to remember that attempts to self-repair a SAMSUNG LE37M87BD TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!


SCHEMATICS --------->  Samsung LLE37M87BDX, LE40M87BDX, LE46M87BDX, LE52M87BDX Chassis GTU37SEN, GTU40SEN, GTU46SEN, GTU52SEN.

PSU SCHEMATIC ----->  BN44-00157A.


The appearance of the MainBoard BN41-00813E is shown in the figure below:
BN41-00813E
BN41-00813E can be used in TVs:
SAMSUNG LE23R86 LE23R86BCX / FID (Panel T230XW01 v1), SAMSUNG LE37M87BD LE37M87BDX (Panel T370HW02 v.2), SAMSUNG LE52M87BD (Panel LTA520HA03), SAMSUNG LE40N87BDX LE40N87H1 (Panel).
PSU Advanced
The LE37M87BD TV is equipped with a BN44-00157A power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the TDA4863-2 PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the value of the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). 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 LE37M87BD device:
Installed matrix (LCD-panel) T370HW02 V.2.
The matrix control uses the Timing Controller (T-CON) T370HW02.
To power the backlight, an inverter 4H.V1838.461 is used, it is controlled by the PWM controller OZ964SN. A transformer 6024B73DB14 (GP) is installed in the inverter converter.
The necessary supply voltages for all nodes of the SAMSUNG LE37M87BD TV are generated by the BN44-00157A power module or its analogs using TDA4863-2 (PFC), VIPer22A (Standby), F9222L (PWM resonant) microcircuits.
MainBoard - the main board (motherboard) is a BN41-00813E module, using microcircuits MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000 and others.
The tuner BN40-00096A DN0S403MH261B (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T370HW02 V2
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 550 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit)
Response Time: 15/8 (Tr / Td); 6 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 07:25
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