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 !

Thursday 7 February 2019

ACER V223W – TFT LCD MONITOR – SMPS AND BACK-LIGHT INVERTER SCHEMATIC - 715G2930-C

Acer V223W – TFT LCD Monitor – SMPS and Back-light Inverter Schematic - 715G2930-C

The following symptoms are normal with LCD monitor and do not indicate a problem.
* Due to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the Power Switch and then turn it on again to make sure the flicker disappears.
* You may find slightly uneven brightness on the screen depending on the desktop pattern you use.
* The LCD screen has effective pixels of 99.99% or more. It may include blemishes of 0.01% or less such as a missing pixel or a pixel lit all of the time.
* Due to the nature of the LCD screen, an afterimage of the previous screen may remain after switching the image, when the same image is displayed for hours. In this case, the screen is recovered slowly by changing the image or turning off the Power Switch for hours.
When the monitor is power on, the LOGO will be showed in the center, and disappear slowly.
Plug & Play DDC2B Feature.
This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.
The DDC2B is a bi-directional data channel based on the I²C protocol. The host can request EDID information over the DDC2B channel.
This monitor will appear to be non-functional if there is no video input signal. In order for this monitor to operate properly, there must be a video input signal.
Using The Right Power Cord
The accessory power cord for the Northern American region is the wallet plug with NEMA 5-15 style and is UL listed and CSA labeled. The voltage rating for the power cord shall be 125 volts AC.  Supplied with units intended for connection to power outlet of personal computer: Please use a cord set consisting of a minimum No. 18 AWG, type SJT or SVT three conductors flexible cord. One end terminates with a grounding type attachment plug, rated 10A, 250V, and CEE-22 male configuration. The other end terminates with a molded-on type connector body, rated 10A, 250V, having standard CEE-22 female configuration.  Please note that power supply cord needs to use VDE 0602, 0625, 0821 approval power cord in European counties.
SMPS BOARD SCHEMATIC – 715G2930-C
Software flow chart
1. MCU initializes.
2. Is the EEPROM blank?
3. Program the EEPROM by default values.
4. Get the PWM value of brightness from EEPROM.
5. Is the power key pressed?
6. Clear all global flags.
7. Are the AUTO and SELECT keys pressed?
8. Enter factory mode.
9. Save the power key status into EEPROM.  Turn on the LED and set it to green color. Scalar initializes.
10. In standby mode?
11. Update the lifetime of back light.
12. Check the analog port, are there any signals coming?
13. Does the scalar send out an interrupt request?
14. Wake up the scalar.
15. Are there any signals coming from analog port?
16. Display "No connection Check Signal Cable" message. And go into standby mode after the message disappears.
17. Program the scalar to be able to show the coming mode.
18. Process the OSD display.
19. Read the keyboard. Is the power key pressed?
Posted By: FRANK at 01:41
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