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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday 25 March 2019

ACER AT2645 - AT2646 - LCD TV - FACTORY MODE - WHITE BALANCE & LUMINANCE ADJUSTMENT - PC-MODE DISPLAY ADJUSTMENT

ACER AT2645 - AT2646 - LCD TV - FACTORY MODE - WHITE BALANCE & LUMINANCE ADJUSTMENT - PC-MODE DISPLAY ADJUSTMENT



W/B & LUMINANCE
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
  • YPbPr Mode display adjustment
  • White balance adjustment (B)
General set-up :
Equipment Requirements: 
  1. Minolta CA-110 or Equivalent Color analyzer Quantum Data Pattern Generator 802G , 802BT or equivalent instrument Input requirements:
  2. Input Signal Type: YPbPr signal
  3. 720P mode, TVBar100 pattern by 802G or 802BT.
  • Select Smart picture to User mode and check the x, y data.
  • Input Signal Strength: 1 Vpp for Y signal; 700 mVpp for Pb & Pr signal
  • Input Injection Point: YPbPr (RAC jack)
  • Select source as “Component”.
  • Set Smart picture as “User” and to be Contrast =50(TBD) (CMO), Brightness=50(TBD) (CMO), at normal menu mode.
  • Apply “TVBar100” pattern with color bar pattern by signal generator.
  • Enter factory mode menu: press “MENU+ “234” then enter FAC mode.
Alignment:
  • At FAC mode menu, select FACTORY->Picture ->ADC -> Auto Colour item. Then press “>” key to adjust ADC_GAIN_R, ADC_GAIN_G, ADC_GAIN_B and  DC_OFFSET_R, ADC_OFFSET_G, ADC_OFFSET_B. Then store those values to NVM.
White- Balance alignment :
  1. Select source as “HDMI1”
  2. Apply Flat pattern (100% white pattern) , at FAC mode menu, select Factory -> Picture -> Colour Temp item
  3. Set color temperature to “Standard”.
  4. Adjust the R Gain, G_Gain, B_Gain values to meet “Standard” color coordinates specification below. Then store those values to NVM.
  5. Set color temperature to “Warm”.
  6. Adjust the R Gain, G_Gain, B_Gain values to meet “Warm” color coordinates specification below. Then store those values to NVM.
  7. Set color temperature to “Cold”.
  8. Adjust the R Gain, G_Gain, B_Gain values to meet “Cold” color coordinates specification below. Then store those values to NVM.
  • Use Minolta CA-110 for color coordinates and luminance check.
  • Luminance > 400 cd/m2 in the center of the screen when Brightness control at 100; Contrast control at 100
  • Reset AV setting, smart picture shall be recalled to be “Standard” and Contrast= (TBD) (CMO), Brightness=(TBD) (CMO).
PC MODE DISPLAY ADJUSTMENT
  • Equipment Requirements: Minolta CA-110 or Equivalent Color analyzer Chroma 2250 or equivalent PC signal generator.
  • Input requirements:  Input Signal Type: PC VGA signal 1024X768/60Hz PC mode with PGCWRGB pattern. Input Signal Strength: 0.7 Vp-p linear voltage. Input Injection Point: PC D-SUB input.


ALIGNMENT METHOD
  • Select source as “VGA”.
  • Set Contrast = 50 (CMO) and Brightness=50 (CMO) , at Standard menu mode.
  • Apply “PGCWRGB”(pattern-1) pattern by VGA pattern generator.
  • Enter factory mode menu: press “MENU+ “234” then enter FAC mode
  1. At FAC mode menu, select FACTORY->Picture ->ADC -> Auto Colour item. 
  2. Then press “>” key to adjust ADC_GAIN_R, ADC_GAIN_G, ADC_GAIN_B and ADC_OFFSET_R, ADC_OFFSET_G, ADC_OFFSET_B. 
  3. Then store those values to NVM.
Posted By: FRANK at 02:45
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