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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Tuesday, 3 March 2020

REPAIR / SERVICING TV LG 47SL8500

Technical description and composition of the LG 47SL8500 TV, panel type and applicable modules. The composition of the modules.
LG
Model: 47SL8500
Chassis / Version: LD91K
Panel: LC470WUD (SB) (M4)
T-CON: 6870C-0295D
Inverter (backlight): 6632L-0583A PPW-CC47SS-M (A) & 6632L-0584A PPW-CC47SS-S (A)
Power Supply (PSU): LGP4247-09S EAY58470001
PWM Power: R2A20112 (PFC), L6599 (PWM), VIPer27H (Standby)
MainBoard: EAX60890803 (3) SAA34419901 SAA34326030
IC MainBoard: LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L
Tuner: TDVW-H103F
Control: IR: EAX61195902 (1) EBR62405104
Specifications 47SL8500
LG 47SL8500
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 47SL8500 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Often in such cases, the LGP4247-09S power module is faulty. It is then necessary to measure its output voltages and, if they are absent, it is necessary to check the power switches and rectifier diodes of the converters for a short-circuit probability.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key 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 R2A20112 (PFC), L6599 (PWM), VIPer27H (Standby), 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, all other functions of the TV work. When turned on, the image may sometimes appear for a second.
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 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX60890803 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). When repairing an MB board, you need to check its components LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The TDVW-H103F tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention TV owners! Attempts at self-repair of LG 47SL8500 are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram ----------------> LG 47SL8500 Chassis LD91K

 The appearance of the MainBoard EAX60890803 is shown in the figure below:
EAX60890803
EAX60890803 can be used in TVs:
LG 42SL8000 (Panel LC420WUD (SB) (M4)), LG 37SL8000 (Panel LC370WUD (SB) (M3)).
The appearance of the power supply
Main features of the device LG 47SL8500:
Installed matrix (LCD panel) LC470WUD (SB) (M4).
The matrix control uses the Timing Controller (T-CON) 6870C-0295D.
An inverter 6632L-0583A is used to power the backlight.
The necessary supply voltages for all nodes of the LG 47SL8500 TV are generated by the LGP4247-09S power supply module, or its analogs, using the R2A20112 (PFC), L6599 (PWM), VIPer27H (Standby) microcircuits.
MainBoard - the main board (motherboard) is an EAX60890803 module, using LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L and other chips.
The TDVW-H103F tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470WUD-SBM4
Type: a-Si TFT-LCD, Panel
Diagonal size: 47 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 1039.68x584.82 mm
Brightness: 450 cd / m²
Display Colors: 1.06B (8-bit + Dithering)
Response Time: 6 (G to G)
Frequency: 120Hz + 120Hz
Posted By: FRANK at 02:53
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