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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 14 February 2020

REPAIR / SERVICING TV LG 26LZ5RV

Technical description and composition of the LG 26LZ5RV TV, type of panel and applicable modules. The composition of the modules.
LG
Model: 26LZ5RV ZC
Chassis / Version: ML-041D
Panel: LC260W01 (A5) (KA)
Lamp backlight: 14 Lamp CCFL
T-CON: 6870C-0011D
Inverter (backlight): 6632L-0053E 2300KFG018C-F YPNL-M013C Rev 1.
Power Supply (PSU): 6871TPT275E B12-L02P Rev 2.0 BT-EFL30180W-A
PWM Power: FA5501A (PFC), STR-T2268
MOSFET Power: 2SK3681
MainBoard: 6870TB26A60
IC MainBoard: VCT49XYF C7, MSP4410K B3, MST9883C, GM5221-LF
Tuner: TAEW-G053D (6700VS0003E)
Control: IR: 6870T835C10
Technical Specifications RZ-26LZ5RV
LG 26LZ5RV
General recommendations for repairing TV LCD
Possible manifestations of defects
- LG 26LZ5RV 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 such cases, the fault should be sought first in the 6871TPT275E power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (2SK3681) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) FA5501A (PFC), STR-T2268, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
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 work, and after they are finished, 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 indicates standby or operating mode, or blinks.
Repair or diagnostics of the 6870TB26A60 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Board repair and replacement of VCT49XYF C7, MSP4410K B3, MST9883C, GM5221-LF microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before replacing the tuner TAEW-G053D (6700VS0003E), if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
It should be remembered! Attempts to independently repair the LG 26LZ5RV 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 LG 26LZ5RV Chassis ML-041D


 The appearance of the MainBoard 6870TB26A60 is shown in the figure below:
6870TB26A60
The appearance of the power supply
Main features of the device LG 26LZ5RV:
Installed matrix (LCD panel) LC260W01 (A5) (KA).
The matrix control uses the Timing Controller (T-CON) 6870C-0011D.
An inverter 6632L-0053E is used to power the backlight.
The necessary supply voltages for all nodes of the LG 26LZ5RV TV are generated by the power supply module 6871TPT275E, or its analogs using FA5501A (PFC), STR-T2268 microcircuits and 2SK3681 power switches.
MainBoard - the main board (motherboard) is a 6870TB26A60 module, using VCT49XYF C7, MSP4410K B3, MST9883C, GM5221-LF and others.
Tuner TAEW-G053D (6700VS0003E) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC260W01-A5KA
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1280x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 566.4x339.84 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 7.5 / 8.5 (Tr / Td)
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 12.0V
Posted By: FRANK at 02:12
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