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 !

Wednesday 20 March 2019

AKIRA LCT-26CHSTP - LCD TV - SERVICE MODE [FACTORY MODE] - ADJUSTMENTS

AKIRA LCT-26CHSTP - LCD TV - SERVICE MODE [FACTORY MODE] - ADJUSTMENTS



TO ENTER SERVICE MODE [FACTORY MODE]
  • Enter into child lock of main menu in TV mode, press “OK”, the password input box will appear.
  • USE remote control to input the follows in order:[ 7, red key, 9, blue key,] then you can enter into factory mode menu. After entering into factory mode menu, sign of the factory menu M will appear.
FACTORY MODE DISPLAY
=======================
M 
Index: 1 
HWUC_BRI 0x1F 
======================
  • The M denotes entering into factory mode now, the figures of index denotes the index number now, the HWUC_BRI denotes the name of adjusting item now, the 0X1F denotes the numerical value.
  • Each adjusting item have only one index number, the operator press the numeric key or press P+/P- directly.
Optional and adjustable items, the corresponding relation of index number and adjusting items. [Click on table to Enlarge]
FACTORY MENU ADJUSTMENT METHOD
  • Select the adjusting item operator can skip to the adjusting items by pressing the number key, also can select the adjusting item in the order of P+/P-.when pressing the number key. If the adjusting item is 1~9,input the corresponding number keys and press down “OK”. If the adjusting items tens digit, input a tens digit for example, press number key 8 when adjusting the volume, you can see the color which become green, then press down “OK”. The color of index number turns red, so you already selected corresponding volume adjusting item.
  • Adjusting methods adjust it according to the operating key in above list. For one acting operation. Press OK/V+ example Auto Color. For some variable add/reduce, example Volume, press V+/V-.
  • All menu functions are on in factory mode, if necessary you can use menu to check the items and effect test.
FACTORY MENU DEBUG ITEM
Auto color revise (Auto Color)
You should finish auto color revise first before factory debug. Revise in TV, YPBPR and PC respectively.
Requisite Meters
  • PC one
  • HD signal source one.
  1. Debug (Revise in TV, YPBPR and PC respectively)
  2. Park the channel in C-3 under TV mode, then do AutoColor.
  3. Input color stripe signal in YPbPr and do AutoColor.
  4. Input window signal in PC, the window is white with black signal around.
  5. The result will appear on screen after Auto Color adjustment. As for TV, you should make the adjustment results of Rgain, Ggain and Bgain close to 0×80; If the difference is too great, adjust the value of HWUC_CON(auxiliary saturation),and readjust the Auto Color.
White balance, color temperature adjustment.
Requisite Meters
  • CHROMA 7120 color analyze instrument (or same function instrument, contain color coordinate – chroma diversion card) one .
  • White balance adjusting frock（request the video output range 0-1V is adjustable, 750hm load) one.
Preparation
1. Connect all equipment, switch the condition of LCD TV to AV.
2. Set the picture of LCD TV for standard condition
Set the distance of light receiver of white balance from center place of LCD display screen for 15cm±3cm.   Make sure that the environmental brightness is below 2cd/m2.
White balance, color temperature adjustment
  • Before adjusting it, put the first LCD TV in AV condition, and the image in standard condition, white balance adjust frock send the white vertical signal output from video into AV, adjust output range of balance adjust frock, make the brightness of the LCD TV 200±20cd/m2 (use CHROMA 7120 color analyze instrument to obtain the brightness), then fix the video output range of white balance adjust frock (until all the LCD TV are adjusted). Enter into white balance adjusting item of factory mode, change R, G, B value (try best to adjust this 3 value to maximum). Make color temperature coordinates value same to this table below: (Error limitation ± 4%):
K12000
X = 0.270
Y= 0.277
Note: After color temperature and color coordinates meet the above requirements, you should judge whether is any abnormal color or not, that is to say, is the value of Δuv 0, if not, it means abnormal color, then you should adjust values of R, G, B to 0, meanwhile, meet the color coordinates requirements.
Posted By: FRANK at 04:54
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