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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Thursday, 5 March 2020

REPAIR / SERVICING TV LG RZ-26LZ30

Technical description and composition of the LG RZ-26LZ30 TV, panel type and applicable modules. The composition of the modules.
LG
Model: RZ-26LZ30
Chassis / Version: ML-041A
Panel: LC260W01 (A5) (K8)
T-CON: LC260W01-A5 6870C-0011D
Inverter (backlight): 6632L-0053E, 2300KFG018C-F, YPNL-M013C
Power Supply (PSU): 6871TPT275E BT-EFL30180W
PWM Power: FA5501A (PFC), STR-T2268
MOSFET Power: 2SK3681
MainBoard: 6870T802A70 041023
IC MainBoard: gm5221H, VCT-49XYF, MST9883C, M52758FP
Tuner: TAEW-G053D 6700VS0003E
Control: 6710T00008B
Technical Specifications RZ-26LZ30
LG RZ-26LZ30
General recommendations for repairing TV LCD
Possible malfunctions
- The LG RZ-26LZ30 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Often in such cases, the 6871TPT275E power module is faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, 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 work, 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 indicates standby or operating mode, or blinks.
Repair or diagnostics of the 6870T802A70 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - gm5221H, VCT-49XYF, MST9883C, M52758FP with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner TAEW-G053D 6700VS0003E and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the LG RZ-26LZ30 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!
Service manual / schematic diagram ------------->  LG RZ-26LZ30 Chassis ML-041A


 The appearance of the MainBoard 6870T802A70 is shown in the figure below:
6870T802A70
The appearance of the power supply
Main features of the device LG RZ-26LZ30:
Installed matrix (LCD panel) LC260W01 (A5) (K8).
The matrix control uses the Timing Controller (T-CON) LC260W01-A5.
An inverter 6632L-0053E is used to power the backlight.
The necessary supply voltages for all nodes of the LG RZ-26LZ30 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 module 6870T802A70, using microchips gm5221H, VCT-49XYF, MST9883C, M52758FP and others.
The TAEW-G053D 6700VS0003E tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC260W01-A5K8
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)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 12.0V
Posted By: FRANK at 06:53
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