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, 24 December 2019

REPAIRING / SERVICING TV SAMSUNG LE32D450

Technical description and composition of the SAMSUNG LE32D450 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE32D450 LE32D450G1W
Chassis / Version: U56A / U56B
Panel: T315XW03 V.D
Lamp backlight: 4 Lamp CCFL
T-CON: T315XW07 V2 31T18-C01
Inverter (backlight): integrated into PSU + INV32T4UB
PWM Inverter: OZ9938GN
MOSFET Inverter: AP4506GEH
Trans Inverter: LT-T32A
Power Supply (PSU): BN44-00438A
PWM Power: ICE3BR1065JF, FAN7530 (PFC)
MOSFET Power: STP9NK50ZFP
MainBoard: BN41-01603C BN94-04615P
IC MainBoard: Eeprom: 24C256, Submicom: WT61P805
Tuner: BN40-00197A
Specifications LE32D450
SAMSUNG LE32D450
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE32D450 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In some of these cases, a fault is detected in the BN44-00438A power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of the diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually 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 ICE3BR1065JF, FAN7530 (PFC), in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
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 working, 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 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 BN41-01603C 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements Eeprom: 24C256, Submicom: WT61P805 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00197A 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.
Once again, remind users! Attempts to self-repair a SAMSUNG LE32D450 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!


SCHEMATICS---->  Samsung LE32D450 Chassis U56A, U56B   

 FOR MODELS  LE32D550, LE32D551, LE37D550, LE37D551, LE40D550, LE40D551, LE46D550, LE46D551, LE32D570, LE37D570, LE40D570, LE46D570, LE19D450, LE19D451, LE22D450, LE22D451, LE26D450, LE26D451, LE32D450, LE32D451.

PSU SCHEMATICS---->  BN44-00438A Power Supply schematic diagram.




 The appearance of the MainBoard BN41-01603C is shown in the figure below:
BN41-01603C
BN41-01603C can be used in TVs:
SAMSUNG LE32D451 LE32D451G3W (Panel T315XW03 VD), SAMSUNG LE40D550K1W LE40D550 (Panel LTF400HM03), SAMSUNG LE26D451 LE26D451G3W (Panel T260XW04 V.8), SAMSUNG LE40D551 LE40D551K2W (Panel LTF400HM03), SAMSUNG LE32D450 LE32D450G1W (Panel T315XW03 VD), SAMSUNG LE37D550 LE37D550K1W (Panel T370HW03 VP).
The appearance of the power supply
Main features of the SAMSUNG LE32D450 device:
Installed matrix (LCD panel) T315XW03 V.D.
The matrix control uses the Timing Controller (T-CON) T315XW07.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9938GN PWM controller. A transformer LT-T32A is installed in the inverter converter. As power elements of the inverter, keys of the AP4506GEH type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32D450 television are generated by the BN44-00438A power module or its analogs using ICE3BR1065JF, FAN7530 (PFC) microcircuits and STP9NK50ZFP type power switches.
MainBoard - the main board (motherboard) is a BN41-01603C module, using Eeprom: 24C256, Submicom: WT61P805 and others.
The tuner BN40-00197A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T315XW03 VD
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 08:07
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