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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Wednesday 18 March 2020

REPAIR / SERVICING TV HAIER L24F6

Technical description and composition of the HAIER L24F6 TV, type of panel and applicable modules. The composition of the modules.
HAIER
Model: L24F6
Chassis / Version: F6 RTD2674
Panel: V236H1-L01
Inverter (backlight): 471R1006 467-0101-23731G
PWM Inverter: MPS1022
MOSFET Inverter: ME12P04
Trans Inverter: 401-8322-27411G
Power Supply (PSU): 465-01A2-18001G
MainBoard: 471-01A2-T7601G 2010.04.12 REV: 03 MJ16-AAP231-01672 941-11T7-61401G
Tuner: F21CT-2DK-E
Control: RC-A03
Specifications
HAIER L24F6
General recommendations for repairing TV LCD
Possible manifestations of defects
- The HAIER L24F6 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Most often, with such manifestations, the 465-01A2-18001G power module is found to be faulty. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, but there is sound, it responds to the remote. Or the image appears when you turn it 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 471-01A2-T7601G 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).
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner F21CT-2DK-E and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the HAIER L24F6 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 -------------------->   HAIER L24F6 Chassis

 The appearance of the MainBoard 471-01A2-T7601G is shown in the figure below:
As part of the 471-01A2-T7601G motherboard, an MST6M16JS processor combined with a scaler, DDR WINBOND W9412G6JH-4 RAM and an SPI FLASH 2Mb ROM are used.
It is advisable to start this type of MainBoard repair by checking the voltage converters and linear stabilizers necessary to provide power to the processor nodes, RAM, ROM and standby mode. Check the power of the 5V or 12V LCD panel, depending on the type of panel used, it is advisable directly on the LVDS connector. If, in the presence of the necessary supply voltage, the TV does not exit Stand-by mode, does not respond to the remote control and control buttons, the SPI Flash software should be updated.
471-01A2-T7601G can be used in TVs:
HAIER L24F6 (Panel V236H1-L01), HYUNDAI H-LED22V4 (Panel LTM230HT05), ROLSEN RL-19L1002U (Panel LM185WH2-TL A1), RUBIN RB-22SL1F (Panel LTM230HT01).
The appearance of the power supply
Key Features of HAIER L24F6:
Installed matrix (LCD panel) V236H1-L01.
The 471R1006 inverter is used to power the backlight, controlled by the MPS1022 PWM controller. A transformer 401-8322-27411G is installed in the inverter converter. As power elements of the inverter, keys of the type ME12P04 are used.
The formation of the necessary supply voltages for all nodes of the HAIER L24F6 TV is carried out by the power module 465-01A2-18001G, or its analogues.
MainBoard - the main board (motherboard) is a 471-01A2-T7601G module.
The F21CT-2DK-E tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: CMO
Model: V236H1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V


Posted By: FRANK at 08:18
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