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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Saturday 28 December 2019

REPAIRING / SERVICING TV SAMSUNG LE46M87BD

Technical description and composition of the SAMSUNG LE46M87BD TV, type of panel and applicable modules. The composition of the modules.
SAMSUNG
Model: LE46M87BD
Chassis / Version: GTU46SEN
Panel: LTA460HT-LH2
Inverter (backlight): SSB460WA22L REV04 (SSB460WA22-L / R)
PWM Inverter: FAN7382 (8pin), LX1691A. (16pin)
MOSFET Inverter: FQPF9N50C
Power Supply (PSU): BN44-00166A - IP-301135A
PWM Power: DM0365R (Standby DIP-8), ICE2BS01 (DIP-8 flyback), ICE1PCS02 (PFC)
MOSFET Power: FQPF6N80C, SD20N60 (PFC)
MainBoard: BN41-00813B - MP1.0 BN94-01206C
IC MainBoard: MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000
Tuner: BN40-00096A
Control: IR: BN41-00850A
Technical specifications LE46M87BD
SAMSUNG LE46M87BD
General repair guidelines for TV LCD
Repair of TVs, as well as other devices, it is advisable to start with an external examination. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
Sometimes the SAMSUNG LE46M87BD TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the IP-301135A BN44-00166A general power supply module. If it is working properly, you must check the standby batteries on the Main Board. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are FQPF9N50C, SD20N60.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller FAN7382 (8), DM0365R (8), G0748LP (8) KIA278 R12P1, which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Sometimes the SAMSUNG LE46M87BD TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter of the backlight lamps, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit). 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.
Diagnosis and repair of the motherboard BN41-00813B - MP1.0 BN94-01206C usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
Tuner malfunction Tuner is installed after checking the software and all the 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! Users and owners of LE46M87BD TVs who do not have the appropriate qualifications, knowledge and experience are strongly advised against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device.


SCHEMATIC --------> Samsung Chassis GTU46SEN, GTU52SEN.

 The appearance of the MainBoard BN41-00813B is shown in the figure below:
BN41-00813B
BN41-00813B can be used in TVs:
SAMSUNG LE37M87BD (Panel T370HW02 V.2), SAMSUNG LE46M87BD (Panel LTA460HT-LH2), SAMSUNG LE40M87 LE40M87BD (Panel LTA400HT-LH1).
PSU Advanced
The LE46M87BD model uses a BN44-00166 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the ICE1PCS02 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased DC voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the SAMSUNG LE46M87BD device:
Installed matrix (LCD panel) LTA460HT-LH2.
The SSB460WA22L inverter is used to power the backlight, it is controlled by the FAN7382 (8pin), LX1691A PWM controller. (16pin). As power elements of the inverter, keys of the FQPF9N50C type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE46M87BD TV are generated by the BN44-00166A power module or its analogs using microchips DM0365R (Standby DIP-8), ICE2BS01 (DIP-8 flyback), ICE1PCS02 (PFC) and power switches of the type FQPF6N80C, SD20N60 (PFC).
MainBoard - the main board (motherboard) is a BN41-00813B module, using microcircuits MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000 and others.
The tuner BN40-00096A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA460HT-LH2
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Display Colors:, CIE1931 92%
Lamp Type: CCFL
Posted By: FRANK at 08:45
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