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, 6 February 2019

HP LP2275W – AOC LP2275W – 22INCH LCD COLOR MONITOR – POWER BOARD – CIRCUIT DIAGRAM – 715G2966A

HP LP2275w – AOC LP2275w – 22inch LCD Color Monitor – Power Board – Circuit Diagram – 715G2966A

SMPS board schematic – AOC and HP LP2275w – 22 inch LCD Monitor – 715G2966A
Horizontal Frequency - 30- 93 kHz
SMPS and BACK LIGHT INVERTER SCHEMATIC
Software Flow
1) MCU initialize.
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 initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re 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
disappear.
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?


Product features

Feature
Description
Part number
KE289A4
Type
22-in (55.9 cm) Wide-Aspect Active Matrix TFT (thin film transistor)
Viewable Image Area
22 in (55.9 cm) widescreen; diagonally measured
Screen Opening (W x H)
18.87 x 11.7 in (47.5 x 29.8 cm)
Viewing Angle (typical)
Up to 178° horizontal / 178° vertical (10:1 minimum contrast ratio)
Brightness (typical)*
300 nits (cd/m²)
Contrast Ratio (typical)*
1000:1
Response Time (typical)*
< 6 ms (gray to gray), 16 ms (On/Off)
Pixel Pitch
0.282 mm
Backlight Lamp Life (to half brightness)
30K hours
Color Gamut
HP Vivid Color support (92% color gamut)
Self Powered USB 2.0 Hub
One upstream, four downstream ports (cable included)
Native Resolution
1680 x 1050 @ 60 Hz (WSXGA+), 1.76 Million pixels
Best features
Tilt Range: -5° to + 30° vertical
Swivel Range: -45° to + 45°
Height Adjustable: Yes, range 3.9 in (10.0 cm)
Pivot Rotation: Yes
Posted By: FRANK at 07:19
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