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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Sunday, 22 December 2019

REPAIRING / SERVICING TV SAMSUNG LE32B450C7W


Technical description and composition of the SAMSUNG LE32B450C7W TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE32B450C7W
Chassis / Version: N65A / N65B
Panel: LTF320AP06
Lamp backlight: 4 Lamp CCFL
T-CON: 320AP03C2L V0.1
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2006
MOSFET Inverter: 4N60
Power Supply (PSU): BN44-00260C FSP118-3PI01
PWM Power: FAN7530 (PFC), ICE3BR0665J
MOSFET Power: 7N60
MainBoard: BN41-01165A BN94-02690H
IC MainBoard: CPU: SEMS12, DRAM: K4T511630G-HCE7, SPI Flash: 25L6405DMI-12G, NTP3200, MX25L6445D, WT61P8
Tuner: BN40-00137A DNOQ403SH151A
Appearance
SAMSUNG LE32B450C7W
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE32B450C7W does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Failure in such cases should begin to be sought in the BN44-00260C power supply circuits. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of power switches (7N60) and rectifier diodes for possible breakdown (short circuit).
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key often breaks.
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) FAN7530 (PFC), ICE3BR0665J, 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, but there is sound, it reacts to the remote control. Or the image appears when you turn on and immediately disappears
These manifestations can be triggered by a power supply module, or by inverter defects, as well as a 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 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 BN41-01165A 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 attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: SEMS12, DRAM: K4T511630G-HCE7, SPI Flash: 25L6405DMI-12G, NTP3200, MX25L6445D, WT61P8 which may require replacement with new ones. If the BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If a tuner BN40-00137A DNOQ403SH151A 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 power supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Owners and users of the SAMSUNG LE32B450C7W TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!SCHEMATICS: Samsung LE19B45***, LE22B45***, LE26B45***, LE32B45*** Chassis N65A, N65B.

PSU SCHEMATICS: BN44-00260C Power Supply schematic diagram.

The appearance of the MainBoard BN41-01165A is shown in the figure below:
BN41-01165A
BN41-01165A can be used in TVs:
SAMSUNG LE32B450C4 LE32B450C4W (Panel LTF320AP06), SAMSUNG LE37B530P7 LE37B530P7W (Panel AX094F040E), SAMSUNG LE40B530P7 LE40B530P7W (Panel LTF400HA08), SAMSUNG LE46B530P7 LE46B530P7W (Panel V460H1-L06 RevC1), SAMSUNG LE32B530 LE32B530P7W (Panel LTF320HA09), SAMSUNG LE40B531 LE40B531P7W (Panel LTF400HA08) .
The appearance of the power supply
Main features of the SAMSUNG LE32B450C7W device:
Installed matrix (LCD-panel) LTF320AP06.
The matrix control uses the Timing Controller (T-CON) 320AP03C2L.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller SEM2006. As power elements of the inverter, keys of type 4N60 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32B450C7W TV are generated by the BN44-00260C power module or its analogs using FAN7530 (PFC), ICE3BR0665J microcircuits and 7N60 type power switches.
MainBoard - the main board (motherboard) is a BN41-01165A module, using CPU chips: SEMS12, DRAM: K4T511630G-HCE7, SPI Flash: 25L6405DMI-12G, NTP3200, MX25L6445D, WT61P8 and others.
The tuner BN40-00137A DNOQ403SH151A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF320AP06
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 09:19
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