Question about Acer AL1716 17" LCD Monitor

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About the Regulator ic

Thanks for letting me know where the regulator ic circuit is. I do know on the big black capacitor on that it does hold a charge i do not know the exact voltage it has however i do have an indicator that shows it does have a charge going through it. I will take the board to my circuits class to test the regulator ic to try to pin point whats not working.

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Your welcome, just info me if you done to test the regulator ic.

Posted on Mar 12, 2008


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Warking principle of VRM circuit

The Voltage Regulator is the Motherboard Voltage Regulator circuit, which is built into the motherboard, and not a separate module.
Therefore not replaceable as a single unit, but at individual electronic component level.

The Radial Aluminum Electrolytic Capacitors, that surround the processor socket are part of the motherboard voltage regulator circuit.

General example,

There are 6 of these capacitors on the left side of the processor socket. These deal with the processor.

However there may be more capacitors involved in the motherboard voltage regulator circuit, and specifically for the processor, but are Not close by.

There may be more in outlying areas, away from the Processor socket.
Found by tracing the circuit traces on the motherboard, from processor socket to capacitor.

The black 'small boxes' to the left of the processor socket, are also involved in the motherboard voltage regulator circuit.
These are Ferrite Chokes.

For more information on the motherboard voltage regulator circuit,

Visual signs of capacitor failure,

For additional questions please post in a Comment.


(Voltage for Processor, and Ram Memory are adjustable in BIOS Setup, to my knowledge)

Nov 01, 2012 | MSI K9MM-V Motherboard

1 Answer

I have a problem with my pc. I have a msi ms-7037 ver1 with intel 865pe/g/gv chipset. the problem has been going on for quite a while now. whenever I turn on my pc I hear all the fans turning on but I get...


Good photo, thanks for posting!

Those 6 Radial Aluminum Electrolytic Capacitors are bad.

They are in the motherboard voltage regulator circuit, and one's used to control voltage for the Processor.

(NOTE* Not all Electrolytic capacitors used in the motherboard voltage regulator circuit, and specifically for the Processor, are near the Processor. There may be others also, and not close to the Processor socket )

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.

The Processor MUST have a steady, 'clean', supply of Voltage, AND the voltage must be kept within a VERY tight tolerance range, for the Processor.

Detailed information on the motherboard voltage regulator circuit,

How to identify the manufacturer, and values,

Video about bad Electrolytic Capacitors, in the motherboard voltage regulator circuit,

(Starts at 0:04)

A little information on replacing capacitors,

Visual identification of bad Electrolytic capacitors,

One place to buy -> Radial -> Aluminum Electrolytic Capacitors,

Need guidance using the above website, post back in a Comment.

For additional questions please post in a Comment.

Jul 21, 2012 | Computers & Internet

2 Answers

W/supply voltage fuse is ok w/output voltage no supply voltage on fly back

Very likely the flyback is bad. Most CRT sets have an SCR clamping circuit that "crowbars" or shunts power if the voltages on the flyback outputs are not within spec.

Jan 30, 2011 | Televison & Video

1 Answer

Television has double images like 3D, and bottom half of screen has a concaved image.

Please replace convergence ICs in tv, there are two big black ICs that has number STK392-110 mounted with big aluminum heat sink, replacement these ICs will solve your tv problem. Also check big resistor nearby these convergence ICs and replace if found burn mark or color faded.
On circuit board, IC location number is IC7001 and IC7002
Let me know if you have additional question.

Dec 25, 2010 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

I have a proview lcd monitor model pl866s .What is the size of the power connector for the 19vdc @3068a psu?I have an extra psu with the correct voltage /current .Thanks Robert.

For the above LCD Monitor, I actually saw a small spark at the top part of the main board once the power input jack was connected. It prompted me to the exact location and when I check the SMD ceramic capacitor (that generated the spark underneath it) with analog meter set to X 10 K ohm range; it actually developed a slight short circuit. Replacing only the fuse and the SMD ceramic capacitor solved the no power problem in this 19" LCD Monitor. This Monitor uses the inverter IC (OZ960G), A1084-25CM (2.5 volts voltage regulator), AMC1117-3.3 (3.3 volts voltage regulator), ADC IC (MST8136B) and CPU IC (MYSON MTV312MV64).

Oct 07, 2010 | Proview PL 866s (Gray, Silver) 18 in. Flat...

1 Answer

Panasonic DMR-E55 gives frequently "SELF CHECK". Sometimes it working ok but when i try to erase some recordings he goes to SELF CHECK. The problem came very slowly.Is this a problem with the power...

in short "yes". the switching regulator IC (component found on heatsink "cooks" because the heatsink is not big enough).
start with checking power supply capacitors for bulging tops or electronic leakage (preferably using ESR meter) & fitting bigger heatsink. If problem persists then replace switching regulator IC

Sep 23, 2010 | Panasonic DMR-E55 DVD Recorder

1 Answer

Shrinking horizontal screen image appears with black border approx 1/2" on both sides

The most likely cause is a dried up main filter capacitor. Once the effective capacitance drops low enough, 120 Hz (or 100 Hz in countries with 50 Hz power) ripple will make its way into the regulated DC supply (assuming full wave rectification).

Another likely cause of similar symptoms is a defective low voltage regulator allowing excessive ripple. The regulator IC could be bad or filter capacitor following the IC could be dried up.

The best approach to testing the capacitors is to clip a good capacitor of approximately the same uF rating and at least the same voltage rating across the suspect capacitor (with the power off). A capacitor meter can also be used but the capacitor may need to be removed from the circuit.

Once the capacitors have been confirmed to be good, voltage measurements on the regulator should be able to narrow down the problem to a bad IC or other component.

Feb 21, 2010 | Dell E551 15" CRT Monitor

1 Answer

Tv shuts off after screen goes red

Good Day sir, the reason why your tv act that way is the switching power supply. The power supply regulator, cannot supply the current needed by your TV. these can be caused by several factors. a faulty switching regulator, low power, or filter capacitor leaking, check the voltage across the VCC after the regulator, if possible the switching transistor. and the ic that controls the pulse they are usually near each other. for safety reasons, better consult your service personnel. hope this helps. if you need more assistance, do let me know. thanks

Jul 28, 2009 | Televison & Video

1 Answer

Black at bottom of screen then disapears when warmed up

On some model Toshiba Tvs have 2 small red Electrolitic capacitor on maim board, one dose capacitor are close of the big IC and the othe is around of the regulator circuit. I'm sorry I don't have now the lokation numbers for those capacitor, but these capacitor are red color making easy to find then. Tri.

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1 Answer

Picture problems

Sounds like a problem in the main power regulator circuit, such as a bad capacitor or regulator IC or transisitor. There are no user serviceable parts inside these sets and every thing is soldered into place. I recomend that you call in a trained service tech to assist you with this repair.

Sep 25, 2006 | Proscan PS50670 50" Rear Projection...

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