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, 13 March 2019

KONKA KLC-2611QS - KLC-2621QS - KLC-3211QS - KLC-3221QS - KLC-2718QS - HOW TO ENTER SERVICE MODE & ADJUSTMENTS - TROUBLESHOOTING

KONKA KLC-2611QS - KLC-2621QS - KLC-3211QS - KLC-3221QS - KLC-2718QS - HOW TO ENTER SERVICE MODE & ADJUSTMENTS - TROUBLESHOOTING



TO ENTER SERVICE MODE [FACTORY MODE]
  • Using the remote control, press Menu button once first, then press RECALL (or named PRE.CH) 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,Temp, and press the vol+ to enter the sub menu and setting the value.
  • To exit the factory menu, press the MUTE button again and again or turn off the TV.
AGC adjustment
  • In TV mode, Receive 60dB split field signal. Enter factory mode menu
  • “UOC III” item, press”CHAN DN” to select “AGC”then use VOL+/- to adjust the item until the voltage of Pin 1 of N100 to be about 2.5V±0.2V,or the noise in the picture disappears.
WHITE BALANCE ADJUSTMENT
  • 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 “RECALL” 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=0.283,Y=0.297), or plug automatic calibration system to adjust white calibration automatically.
QUICK TROUBLESHOOTING
  • Verify the state of TV set. Please switch the TV on, and then verify the LED color. Red is standby state and green is working state.
  • Checking Supply Power. If the color of LED is green, the power supply for signal board : N820 supply 5V, N804,N806 supply 3.3V power(Test the PIN2.N805 supply 2.5V(Test the PIN 2), D803 supply 8.3V, V401 and V402 supply 1.8V. All these are for main IC N401,N501. N860 supply 12V(26’’ and 32’’), N802 supply 5V(27’’).
  • 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 every power supply is normal.
  • Check if the crystal oscillator X501(14.318MHz) X401(24.576MHz) oscillate or not, and oscillate frequency is right or not.
  • Back light control signal (BKLON) of XS805 has high level (about 2.5V) or not, if not, check whether fault soldered or short circuit happened.
  • If back light lamp is on while there is no display, check N401 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.
Posted By: FRANK at 06:10
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