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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 19 March 2019

KONKA KL26AS21Q - KL27BS23Q - KL32AS21Q - KL37BS21Q - KL40BS21Q - KL42AS23Q - REPAIR HELP

KONKA KL26AS21Q - KL27BS23Q - KL32AS21Q - KL37BS21Q - KL40BS21Q - KL42AS23Q - REPAIR HELP


APPLICABLE TO - KL26AS21Q - KL26AS23Q - KL26AS25Q - KL27BS23Q - KL32AS21Q - KL32AS22Q - KL32BS23Q- KL32AS25Q - KL32BS28Q - KL37BS21Q - KL37AS22Q - KL37AS23Q -  KL40BS21Q - KL42AS23Q
  • Power Supply Board/ M/B Voltage confirmation
  • The input and output characteristic test of power
  • Intention of test: Check input and output to find if short circuit.
Checking Method:
Use Multimeter (VICTOR VC9801) of resistor to check No/Yes short circuit.
Number
Item
Test Point
Standard
Power Supply



1
The resistor of AC input
AC Input Connector CON1
No short circuit
2
The resistor of 24Voutput
24Voutput of connector CON3
No short circuit
3
The resistor of 12Voutput
24Voutput of connector CON3
No short circuit
M/B



1
The resistor of 24Voutput
24Voutputof connector XS801
No short circuit
2
The resistor of 12Voutput
12Voutputof connector F800
No short circuit
3
The resistor of 5Voutput
5Voutput of connector L804
No short circuit
4
The resistor of 3.3Voutput
3.3Voutput of connector N803
No short circuit
5
The resistor of 2.5Voutput
2.5Voutput of connector N808
No short circuit
6
The resistor of 1.8Voutput
1.8Voutput of connector N804
No short circuit
7
A: The resistor of PANEL5V output
B: The resistor of PANEL12Voutput
A: PANEL5Voutput of connector L814
B: PANEL12Voutput of connector L813
No short circuit
Verify the state of TV set:  switch the TV ON by “Power on/off” switch, Then verify the LED color of touch button. Red is standby state and blue is working state.
Checking Supply Power:  If the color of LED is green, the power supply for signal board. F801 supply 5V, N804, N803 supply 3.3V power(Test the PIN 2). N808 supply 2.5V(Test the PIN 2), D806 supply 8V, N804 supply 1.8V. All these are for main IC N001, N401, N504.

Digital signal part:  Turn on the power => N001 RESET and IO port initialize => N504 electrify, reset, initialize => Turn on back light lamp => Successful start And LOGO display.
  • After turning on the power, if blank screen appears (no back light lamp), just press POWER button one times, if blank screen still there.
  • Check if the voltage of every power supply is normal.
  • Check if the crystal oscillator Z001(22.1184MHz) Z501(14.318MHz) Z400(24.576MHZ) oscillate or not, and oscillate frequency is right or not.
  • Back light control signal (BKLON) of XS806 has high level (above 3V) or not, if not, check whether fault soldered or short circuit happened.
  • If back light lamp is on while there is no display, check N001 and N504’s reset circuit and the output of the oscillator to confirm the CPU and SCALER are working or not. If RGB is abnormal, check N504;If RGB is working correctly and the other channel is abnormal check N504.
White calibration adjustment.
  • Receive black or white signal under AV or PC mode, adjusting brightness and contrast to set the brightness to 5 Nit in dark area and 90 Nit in bright area.
  • Adjust white balance. 
  • Enter factory menu, select User RGB Menu

Adjust
B-R
0-63
default
32

B-G
0-63
default
32

B-B
0-63
default
32

C-R
0-205
default
128

C-G
0-205
default
128

C-B
0-205
default
128
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.
Posted By: FRANK at 06:28
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