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.

How to use the site:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 !

Saturday, 9 February 2019

AOC PDP 4294LV1 _ PWBS _ FUNCTIONS GUIDE

AOC PDP 4294LV1 _ PWBs _ FUNCTIONS GUIDE

 X/BD

  • Receiving LOGIC signal from CONTROL B/D and make ADDRESS PULSE(generates Address discharge)by ON/OFF operation, and supplies this waveform to COF(data).




COF SEPARATING
  •  Lift up lock as shown in arrow.




  • Pull COF as shown in arrow





Z SUSTAIN B/D
  • Make SUSTAIN PULSE and ERASE PULSE that generates SUSTAIN discharge in panel by receiving LOGIC signal from CONTROL B/D.
  • This waveform is supplied to panel through FPC(Z).  *composed with IPM,FET,DIODE, electrolytic capacitor ,E/R coil.
FPC SEPARATING
  • Separate the fixed Screw of Z-Board.  Pull out Lock as shown in arrow.

  • Condition in Lock part is pulled.
  • Pull FPC Connector as shown in arrow.





IPM stands for (Intelligent Power Module)
E/R stands for(Energy recovery)

Z-SUSTAIN BOARD


 



Y DRIVE B/D

  • This is a path to supply SUSTAIN ,RESET waveform which made from Y SUSTAIN B/D to panel through SCAN DRIVER IC.
  • Supply a wave form that select Horizontal electrode (Y SUSTAIN electrode) sequentially.   potential difference is 0V between GND and Vpp of DRIVER IC in SUSTAIN period.  being generated potential difference between GND and Vpp only in SCAN period.
  • In case of 42” V6 use DRIVER IC IC 8 EA (TOP, BOTTOM: each 4EA)

Y-SUSTAIN B/D
  • Generates SUSTAIN,RESET waveform, Vsc(SCAN)voltage, and supplies it Y DRIVER B/D.
  • Composed with IPM,DIODE, electrolytic capacitor ,FET. [Field Effect Transistor]
CONTROL BOARD
  • Creates signal processing (Contour noise,reduction ISM,..) and an order of many FET on/off of each DRIVER B/D with R,G,B each 8bit input.
  • Use 3.3V/5V 2 kinds of power.

DC/DC CONVERTER PART
  • Being impressed 5V, Va ,Vs, DC/DC converter makes 5V,Va,Vs,Vset_up,Vsc which is essential for each B/D.
  • There is no DC/DC B/D in model 40/42 1 POWER B/D). 50 & 60 embedded DC/DC B/D separately because of high power consumption.
FPC [Flexible Printed Circuit]
  • Supply a driving waveform to PANEL by connecting a PAD electrode of PANEL with PCB(Y and Z).
  • There is two type of this for Y B/D. One is single-sided, another is double-side. These are having pattern on it * for Z B/D, there is no pattern , single-sided, and Beta type(all of copper surface).
FFC [Flat Flexible Cable]
  • For connecting a Logic signal between B/D and B/D.  There is 0.5mm pitch,50pin type 1mm pitch ,30pin type.
COF [Chip On Film]
  • Supply a waveform which made from X B/D to panel and select a output pin that is controlled by COF when be on or off.  96 output pin per IC.
  • The more the resolution higher, the less spare space where can set IC on it in B/D. without using IC PACKAGE, we can use a BARE IC , so we can get IC with LOW COST
  • Because we do not solder IC on PCB directly, a soldering defect rate decrease.
42 V6 COF is the same as 42V5.
IPM [Intelligent Power Module]
  • Composition: HEATSINK,CAPACITOR,,DIODE,IC LINEAR, RESISTORTANSISTOR,FETS.
  • Description:  Attached at Z B/D and Y B/D, make Sustain waveform.
  • Sustainer : supply a square wave to panel to make a video.
Posted By: FRANK at 02:23
TAG: , ,