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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Sunday, 22 December 2019

REPAIRING / SERVICING TV SAMSUNG LE26R71B

Technical description and composition of the SAMSUNG LE26R71B TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE26R71B
Chassis / Version: GBD26KE
Panel: T260XW02 V.5
T-CON: T315XW01_V5 AUO-016K1, EM638325TS-6G
Inverter (backlight): VIT71008.91 // HIU-641C HPC-1561D
PWM Inverter: OZ964SN, LM339A LM393
MOSFET Inverter: AO4614
Trans Inverter: T51.0034.211
Power Supply (PSU): BN96-03058A
PWM Power: VIPer22A, 4863-2 / G0622, F9222L
MainBoard: BN41-00680D BN94-00847C
IC MainBoard: M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G
Tuner: BN40-00079A
Control: BN-00507A
Technical Specifications LE26R71B
SAMSUNG LE26R71B
General repair guidelines for TV LCD
It is advisable to start the diagnostics of the malfunction of the SAMSUNG LE26R71B TV, as well as all other varieties of this model, with an external examination of both external and internal elements. Visible damage to elements can sometimes suggest directions for finding a defect even before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, it does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the BN96-03058A power module is defective and needs repair. Sometimes with similar manifestations, a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
Using an Active KKM (PFC) power supply module, troubleshooting is sometimes a little more complicated. An indirect sign of the health of the PFC (Power Factor Correction) node can be the presence of an increased voltage on the filter capacitor of the CP803 rectifier network. Usually in operating mode, it is about 380 volts.
If the SAMSUNG LE26R71B TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
In most cases, the diagnosis and repair of the VIT71008.91 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or breaks in high-voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
Repair of the motherboard BN94-00847C (BN41-00680D) must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its VIPer22A, 4863-2 / G0622, MC33167T, Tuner: BN40-00079A chips and other possible faulty components of the board.
Once again, remind users! Attempts to self-repair a SAMSUNG LE26R71B TV without the appropriate qualifications and experience can lead to its complete non-repairability!


 The appearance of the MainBoard BN41-00680D is shown in the figure below:
BN41-00680D
BN41-00680D can be used in TVs:
SAMSUNG LE26R71B (Panel T260XW02 V.5), SAMSUNG LE27S71B (Panel V270B1-L01), SAMSUNG LE27S71BS (Panel V270B1-L04), SAMSUNG LE32S71BS LE32S71B (Panel V315B1-L01 Rev.C2 (SAMSUNG LEB) -L01 0T1), SAMSUNG LE32R71B (Panel V320B1-L01 REV.C4), SAMSUNG LE32R72B (Panel T315XW02 V.0).





The appearance of the power supply
Main features of the SAMSUNG LE26R71B device:
Installed matrix (LCD panel) T260XW02 V.5.
The matrix control uses the Timing Controller (T-CON) T315XW01_V5.
To power the backlight, the inverter VIT71008.91 is used, it is controlled by the PWM controller OZ964SN, LM339A LM393. A transformer T51.0034.211 is installed in the inverter converter. As power elements of the inverter, keys of the type AO4614 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE26R71B TV are generated by the BN96-03058A power module or its analogs using VIPer22A, 4863-2 / G0622, F9222L microcircuits.
MainBoard - the main board (motherboard) is a BN41-00680D module, using chips M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G and others.
The tuner BN40-00079A provides the reception of television programs and tuning to channels.
Information from an alternative source:
SAMSUNG LE26R71B Chassis GBD26KE
Panel Type (Matrix): T260XW02 V.5,
Motherboard: PCB 00311679 BN94-00847C (BN41-00680D), Tuner: BN40-00079A
T-con: T315XW01_V5, AUO-016K1, EM638325TS-6G
Invertor: VIT71008.91
PSU: BN96-03058A, ICS801S: VIPer22A, ICP801S = 4863-2 / G0622, ICM852: MC33167T
Remote control: BN-00507A

Additional technical information about the panel:
Brand: AUO
Model: T260XW02 V5
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/5 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 8 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V

Posted By: FRANK at 06:32
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