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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Friday 29 March 2019

DAYTEK LC2018 - HOW TO ENTER SERVICE MODE - SMPS SCHEMATIC

DAYTEK LC2018 - HOW TO ENTER SERVICE MODE - SMPS SCHEMATIC

How to enter service mode_Adjustments_Checking procedure_Power Supply Regulator Circuit Diagram_ DAYTEK LC1508NT LC1521NT LC2018NT

SERVICE MODE [FACTORY MODE]
> To enter factory mode adjustment Using the remote control, press Menu button once first , then press PRE.CH(or named RECALL) button five times,and you can see manufacture menu on the LCD panel.
> Press the channel +/- button to selection the sub menu of factory menu（including F,E, UOCⅢ,RGBTemp,Temp and press the vol+ to enter the sub menu and setting the value.
> Press the MUTE button again and again or turn off the TV, it can exit the factory menu.
ADJUSTMENT ITEMS
* AGC adjustment In TV mode,Receive 60dB split field signal.Enter factory mode menu “UOC Ⅲ” item, press”CHAN▼” to select “RF AGC”,then use VOL+/- to adjust the item until the voltage of Pin 1 of N100 to be about 2.5V±0.2V,then noise wave of the picture point disappears.
* White calibration adjustment 1 Receive black or white signal under AV or PC mode, adjusting brightness and contrast to set the brightness to 15Nit in dark area and 90 Nit in bright area.
Adjust white balance. Press“MENU”button once, then press “PRE.CH”five times to enter factory menu, select “Temp” Menu,
Adjust Red 0-100 Green 0-100 Blue 0-100
Adjusting chromaticity coordinates of black and white to fit the requirement (X=0.285, Y=0.293), or plug automatic calibration system to adjust white calibration automatically.
START ORDER
Turn on the power > N401 RESET and IO port initialize > N501electrify, reset, initialize > Turn on back light lamp > Successful start and LCD display
CHECKING
1 Verify the state of TV set. Switch the TV on ,then verify the LED color. Red is standby state and green is working state.
2 Checking Supply Power. If the color of LED is yellow, the power supply for signal board.  N801 supply 5V and N802 supply 3.3V(KLC-1508US,KLC-1521US),N804、 N806 supply 3.3V power(Test the PIN 2).N805 supply 2.5V(Test the PIN 2),D803 supply 8.3V,V401 and V402 supply 1.8V. All these are for main I CN401, N501
3 After turning on the power, if blank screen appears (no back light lamp), just press POWER button several times, if blank screen still there. Check if the voltage of power supply is normal.
4 Check if the crystal oscillator X501(14.318180MHz) X401(24.576MHz) oscillate or not, and oscillate frequency is right or not.
5 Back light control signal (BKLON) of XS801 has high level (about 2.5V) or not, if not, check whether fault soldered or short circuit happened。
6 If back light lamp is on while there is no display, check N407 and N501’s reset circuit and the output of the oscillator to confirm the CPU and SCALER are working or not. If RGB is abnormal, check N501; If RGB is working correctly and the other channel is abnormal, check N501.
SMPS SCHEMATIC [Circuit Diagram]
Click on the circuit diagram to Magnify
Posted By: FRANK at 03:40
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