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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Sunday 23 February 2020

REPAIR / SERVICING TV LG 37LE5300

Technical description and composition of the LG 37LE5300 TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 37LE5300
Chassis / Version: LD01D
Panel: LC370EUH (SC) (A1)
LED backlight: 3660L-0351A, 1-1 LG lnnotek 37 inch Rev 0.5 54EA TYPE-A / TYPE-B
T-CON: T370HW04 V.1
LED driver (backlight): integrated into PSU
PWM LED driver: AS3693B, ATMEGA48PA
Power Supply (PSU): PLDD-L902A 3PAGC10017A-R EAY60802901
PWM Power: VIPer27L (Standby)
MainBoard: EAX61766102 (0)
IC MainBoard: CPU: LGE107D, Nand: HY27UF082G2B, SPI Flash: Winb25Q80, Audio: NTP7100
Tuner: TDTJ-S001D
Control: AKB72914209, IR: LE50_70 (Large) Ver 1.8
Specifications 37LE5300
LG 37LE5300
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 37LE5300 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 likely in this case, the main switching power supply (IIP) PLDD-L902A is faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. Chips PWM (PWM) VIPer27L (Standby) are usually 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.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX61766102 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: LGE107D, Nand: HY27UF082G2B, SPI Flash: Winb25Q80, Audio: NTP7100 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before replacing the TDTJ-S001D tuner, if there is no tuning to 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

For owners of the 37LE5300 TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!

 schematic diagram ------------->  LG CHASSIS: LD01D; 37LE5300/5308, 37LE5300/5308-ZA, 37LE530N 37LE530N-ZA, 37LE5310/5318, 37LE5310/5318-ZB SERVICE MANUAL


 The appearance of the MainBoard EAX61766102 is shown in the figure below:
EAX61766102
EAX61766102 can be used in TVs:
LG 42LE4500 ZA (Panel LC420EUG), LG 42LE4508 ZA (Panel T420HW07 V.5), LG 37LE5300 (Panel LC370EUH (SC)(A1)), LG 32LE4500 ZA (Panel T315HW05 V.3), LG 32LE5300 ZA (Panel T315HW05 V.1), LG 32LE3300 32LE3300-ZA.BRUWLJU (Panel LC320EXN (SC)(A1)), LG 37LE4500 37LE4500-ZA (Panel T370HW04 V.4 ), LG 32LE5450 -ZA (Panel LC320EUH (SC)(A1)).
The appearance of the power supply
Main features of the device LG 37LE5300:
Installed matrix (LED-panel) LC370EUH (SC) (A1).
The matrix control uses the Timing Controller (T-CON) T370HW04.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller AS3693B, ATMEGA48PA.
The necessary supply voltages for all nodes of the LG 37LE5300 TV are generated by the PLDD-L902A power module or its analogs using VIPer27L (Standby) microcircuits.
MainBoard - the main board (motherboard) is an EAX61766102 module, using CPU chips: LGE107D, Nand: HY27UF082G2B, SPI Flash: Winb25Q80, Audio: NTP7100 and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC370EUH-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.4x460.9 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 1.06B (8-bit + Dithering), CIE1931 72%
Response Time: 8/10 (Tr / Td)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: Mini LVDS, 120 pins
Posted By: FRANK at 07:55
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