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 !

Wednesday 20 February 2019

AKIRA - 14KLS4/CE SERVICE MODE LA-67931

AKIRA - 14KLS4/CE SERVICE MODE LA-67931


TO ENTER SERVICE MODE

  1. Press "Menu" button on the remote control.
  2. Press "Recall" button three times sequentially to enter Factory Menu.
  3. Press [P+/P-] buttons on the remote control to select an item to adjust.
  4. Press [V+/V-] buttons on the remote control to adjust the data value to selected item.
  5. Press "Recall" button again to 'Exit' the Factory Menu.
DEFAULT DATA VALUES

Factory Menu - 00
  1. H-PHASE = 11
  2. OSD-H-POSITION = 25
  3. V-SIZE = 82
  4. V-POSITION = 1
  5. V-LENEARITY = 22
  6. V-SC = 4
  7. V-KILL = 0
  8. SUB-BRIGHT = 50
  9. RF -AGC AUTO = 25
Factory Menu - 01
  • H-BLK-L = 1
  • H-BLK-R = 1
  • TUNER 0:QJ   1  1:ALPS = 0
  • VOLUME LENEAR MEASURE = 0
  • B-Y DC LEVEL = 10
  • R-Y DC LEVEL = 11
  • B-Y DC LEVEL YUV = 9
  • R-Y DC LEVEL YUV = 8
Factory menu - 02
  1. RED-BIAS = 117
  2. GREEN-BIAS = 134
  3. BLUE-BIAS = 153
  4. RED-DRIVE = 99
  5. GREEN-DRIVE = 15
  6. BLUE-DRIVE = 92
OPTION MENU - 00
  1. BACK COVER OPTION = 0
  2. Q-ASM OPTION = 0
  3. OPT-AV-SYSTEM = 1
  4. Y-IN   0:P48    1:P54 = 1
  5. OPT-YUV = 0
  6. LANGUAGE SW CE = 1
  7. ENG 0  : CH 1 = 0
OPTION MENU 01
  • LV 1116O  OPT = 1
  • AUDIO SW = 1
  • SIF 6.5M = 1
  • SIF 6.0M = 1
  • SIF 5.5M = 1
  • SIF 4.5M = 1
POWER SUPPLY VOLTAGE ADJUSTMENT
  • Check AC voltage is normal or not at AC 220V 50Hz.
  • Receive a broadcast signal and adjust the brightness and contrast until the standard picture is obtained.
  • Adjust (RP950) until voltage between cathode of (VD950) and GND of the chassis is 110V+/-0.5V.
SERVICE FLOW CHART
  • POWER SUPPLY:  Check input voltage > check voltage of C910 anode > check pin 3 of N901 > check V901 > check input voltage of T901 secondary coil > check voltage of N904, N905 pin-3(5v) and N903 pin-3(9v) > check voltage of N103 pin 8,31,32,35,36,43,55 (5V) and pin-11,19 (8V) > check voltage of N602 pin 8 (5V).
  • AUDIO CIRCUIT:  Check power supply of audio power amplifier circuit > check input audio signal of audio power amplifier > check waveform of N103 pin-5 > check waveform of xs808 pins 16,17 > check waveform of N201 pins 8,9.
  • HORIZONTAL CIRCUIT:  Check voltage of T402 pin-3 (110V) > check voltage of N103 pin-19 (+9V) > check waveform of V401 base > check waveform of V402 collector > check output voltage of T402 coil > check waveform of T402 Pin-8.
  • VERTICAL CIRCUIT:  Check voltage of N440 Pin2(+25V) & Pin7(+9V) . check voltage of N103 pin 19 (9V) > check waveform of N103 Pin-17 > check waveform of N440 pin-1 > check waveform of N440 Pin-5.
  • MCU CIRCUIT: Check voltage of N103 Pin 31,32(5V) > check waveform of N103 pin-33
Posted By: FRANK at 06:12
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