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, 20 February 2020

REPAIR / SERVICING TV LG 32LS562T

Technical description and composition of the LG 32LS562T TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 32LS562T
Chassis / Version: LD21B / LC21B
Panel: LC320EUN (SE) (M2)
LED backlight: 6920L-0001C 32 V12 TV Edge REV1.1
T-CON: 6870C-0401B
LED driver (backlight): 6917L-0080A PPW-LE32SE-O (A) REV0.5
PWM LED driver: SW5516
MOSFET LED driver: FDD850N10L
Power Supply (PSU): EAX64310001 (1.9) EAY62512401 LGP32M-12P PSLC-L115A
PWM Power: FAN7930B, ICE3BR4765JZ (Stb), L6599AD
MOSFET Power: TK6P60V
MainBoard: EAX64909901 (1.0) EBR75149818
IC MainBoard: LGE2111A-T8, NAND FLASH: H27U1G8F2BTR, SPI: W25Q80, EEPROM: 24C256, AUDIO: STA380BWE
Tuner: TDSN-G301D
Control: IR: LM35-55 Ver 2.2 MB32B00 1BF-3010B EBR74966702
Specifications 32LS562T
LG 32LS562T
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LS562T TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
With such manifestations, in some cases, the EAX64310001 power module is faulty. It is necessary to measure its output supply voltage, and in case of their absence, check the serviceability of the power switches (TK6P60V) of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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 FAN7930B, ICE3BR4765JZ (Stb), L6599AD, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX64909901 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - LGE2111A-T8, NAND FLASH: H27U1G8F2BTR, SPI: W25Q80, EEPROM: 24C256, AUDIO: STA380BWE. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
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 TDSN-G301D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention to users! Self-repair of the LG 32LS562T TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
To reduce the backlight current in LED drivers with the SW5516 controller, it is necessary to proportionally increase the total resistance of the resistors connected between the 28 output of SW5516 and the housing, for example, by removing one of the resistors. You can calculate the resistance when connecting resistors in parallel here.


More details on this page


 The appearance of the MainBoard EAX64909901 is shown in the figure below:
EAX64909901
EAX64909901 can be used on TVs:
LG 42LM580T-ZA (Panel LC420EUE (SE)(F1)), LG 42LM340T (Panel LC420DUN (SE)(U3)), LG 32LM580T (Panel LC320EUN (SE)(F3)), LG 42LM585T ZD (Panel LC420EUE (SE)(F1)), LG 42LM615T (Panel LC420EUE (SE)(F1)), LG 42LS560T 42LS560T-ZC (Panel T420HVN01.1).
The appearance of the power supply
Main features of the device LG 32LS562T:
Installed matrix (LED-panel) LC320EUN (SE) (M2).
The matrix control uses the Timing Controller (T-CON) 6870C-0401B.
The LED driver 6917L-0080A is used to power the backlight LEDs, it is controlled by the PWM controller SW5516. As the power elements of the LED driver, keys of the FDD850N10L type are used.
The necessary supply voltages for all nodes of the LG 32LS562T TV are generated by the EAX64310001 power supply module or its analogs using FAN7930B, ICE3BR4765JZ (Stb), L6599AD microchips and TK6P60V power switches.
MainBoard - the main board (motherboard) is an EAX64909901 module using LGE2111A-T8 chips, NAND FLASH: H27U1G8F2BTR, SPI: W25Q80, EEPROM: 24C256, AUDIO: STA380BWE and others.
The TDSN-G301D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUN-SEM2
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 07:37
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