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 LE40R51B


Technical description and composition of the SAMSUNG LE40R51B TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE40R51B LE40R51BX
Chassis / Version: RE40EO
Panel: LTA400W2-L01
Lamp backlight: 20 Lamp CCFL
T-CON: 400W2C4LTV0.1
Inverter (backlight): 24V40W2S (HIP0212A)
PWM Inverter: DMB8110D
MOSFET Inverter: SI4942
Power Supply (PSU): BN41-00521B
PWM Power: VIPER12ADIP, ICE1PCS02, STR-W6755
MOSFET Power: 20N60
MainBoard: BN41-00545D 400W2C4LTV0.1 TV11
IC MainBoard: M30620SPGP, SIL9993CTG100, MST9883CR-LF, 3F866BXZZ, MSP4410K, TPA3004D2, 24C32WP
Tuner: BN40-00051A
Specifications LE40R51B
SAMSUNG LE40R51B
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE40R51B TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In some of these cases, a fault is detected in the BN41-00521B power module. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (20N60) and rectifier diodes in the converters for a short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers VIPER12ADIP, ICE1PCS02, STR-W6755, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
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 turn on, the indicator signals standby or working mode, or blinks.
Repair or diagnostics of the BN41-00545D 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements M30620SPGP, SIL9993CTG100, MST9883CR-LF, 3F866BXZZ, MSP4410K, TPA3004D2, 24C32WP. BGA chip malfunctions are usually easy to detect by warming up.
If a tuner BN40-00051A is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
It should be remembered! Attempts to self-repair a SAMSUNG LE40R51B TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!


Service manual and schematic diagram-------> SAMSUNG LE40R51B Chassis RE40EO. Service Manual 98 FOR MODELS   LE23R51B, LE26R51B, LE32R51B, LE40R51B.

PSU SCHEMATIC  Samsung ------------>  BN41-00521B Power supply.

FIRMWARE  SPI EEPROM T-CON, Main ----------> SAMSUNG LE40R51B LE40R51BX, Main: BN41-00545D 400W2C4LTV0.1 TV11, Panel: LTA400W2-L01.



 The appearance of the MainBoard BN41-00545D is shown in the figure below:
BN41-00545D
BN41-00545D can be used in TVs:
SAMSUNG LE32R51 LE32R51BM S (Panel LTA320W2-L14), SAMSUNG LE32R51B (Panel LTA320W2-L01), SAMSUNG LE26R51B LE26R51BM (Panel LTA260W2-L11), SAMSUNG LE40R51B LE40R51BX (SAMSUNG LE40 LB2011BG01LB201LB201LB2301 Panel LTA2G01 LE37R41B (Panel 1366x768 720p HD (LQ370T3LZ41 / LQ370T3LZ44).
The appearance of the power supply
Main features of the SAMSUNG LE40R51B device:
Installed matrix (LCD-panel) LTA400W2-L01.
The matrix control uses the Timing Controller (T-CON) 400W2C4LTV0.1.
To power the backlight, an inverter 24V40W2S is used, it is controlled by the PWM controller DMB8110D. As power elements of the inverter, keys of type SI4942 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE40R51B TV are generated by the BN41-00521B power module or its analogs using VIPER12ADIP, ICE1PCS02, STR-W6755 microcircuits and 20N60 type power switches.
MainBoard - the main board (motherboard) is a BN41-00545D module, using microcircuits M30620SPGP, SIL9993CTG100, MST9883CR-LF, 3F866BXZZ, MSP4410K, TPA3004D2, 24C32WP and others.
The tuner BN40-00051A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400W2-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 885.168x497.664 mm
Surface: Antiglare (Haze 44%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 10/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 07:30
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