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 !

Saturday, 2 February 2019

ACER AL512, ACER AL513 - 15 INCH LCD MONITOR – CIRCUIT DIAGRAM

Acer AL512, Acer AL513 - 15 inch LCD Monitor – Circuit diagram

LCD Panel 15.0" TFT Power Management Energy Star compliant VESA DPMS compatible < 3W Displayable Resolution XGA 1024× 768 (max.) Pixel Dimension 0.297× 0.297mm LCD Display Color 16.7M Color Max. (8bit)
Used ICs: KAM0365R (SMPS)  control, AIC1341/SMD,8051PLCC, TDA7057, Mascot VZ
DC-DC CONVERTER
This block provides adjustable output voltages of 9.2V, -6V, 18V and 3 to 4V for the panel.
It consists of a Q114 transistor and power switch IC I108 (AIC 1526-1).
When DC_ EN signal is high, then Q114 is activated and send one signal to activate I108.
At this time I108 will send 200KHz 12V PWM to Q106, Which is connected with L111, Q106, D203 and C308, to boost 5V to 9.2V. And I108 offers the adjustable voltage of 3V to 4V. By sending out pulses from pin 2 and pin 16 of I108 to double voltage circuit consisting of C301, D201, D202 and C303, leaner regulator with Q105, would output –6V, 18V output id created, according to the rule of –6V creation.
Scalar controller
MascotV scalar is a highly integrated solution that combines a high performance ADC with an advanced image processing controller. Using advanced image scaling algorithms, Mascot V has intelligently adaptive sub-algorithms that will automatically optimize the display quality for different images – the text is sharper and the graphics is smoother. The built-in analog interface includes a 160Mhz, 8-bit 3-channel ADC, preamplifier, and VGA, allowing seamless support to resolutions from VGA to XGA. MascotV also offers other integrated functions such as an internal OSD that supports all languages, and build-in line buffers that allows support to a wide range of LCD panels.
The scalar implements four advanced display technologies:
1. Sampling RGB input signals by fully integrated triple-channel ADC, PLL, and pre-amplifier
2. Automatically calibrate for vertical and horizontal alignment to center display and phase calibration
3. High-quality advanced scaling: Enhanced and adaptive scaling algorithm for optimal image quality
4. One and two pixels per clock panel support: Up to 24 bits per pixel.
The panel interface consists of 48-bit panel data bus, Start Pulse(STH1) and Clock (CLKH), Polarity(POL)/Latch pulse(LP) for source driver IC, Start pulse(STV1) and Clock(CLKV) for gate driver IC, and Data inversion control(HMSO/HMSE) for odd/even pixel bus and the power supply (+3.2V, +3.45V<adjustable>,+9.2V, +18Vand-6V) for panel driver IC use.
Click on the pictures to magnify
Exploded view
Panel Power
MVz
MCU
Audio Output
Inverter
In order to drive the CCFLs embedded in the panel module; there is a ROYER inverter to convert,
The input 12V up to hundreds of AC voltage output.
The inverter is formed by symmetric, in order to drive the separate lamp modules.
The input stage consists of a PWM controller, buck choke, and switching MOSFET (Metal Oxide Semiconductor Field Effect Transistor) to convert DC input into AC output.
The output stage consists of a tuning capacitor, transformer, push-pull transistor pair to boost ac output up to hundreds of voltage.
And one resister is serial to lamp for output current feedback.
A 5-pin connector is the only interface to control the inverter. Pin 1 is 12V input, Pin 2/4 is the returns, pin3 is the control of output current, and pin 5 is the enable/disable control.
Posted By: FRANK at 06:34
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