Question about Intel DG41RQ Motherboard & Core 2 Duo E7500 Processor Bundle (INTEL DG41RQ MB & CORE 2 DUO ...)

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High frequency crystal circuit is damaged due to which on soldering that area regularly results in starting of display

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First check the crystel and the 2 grey smd capictors on the crystel line replace them and check the crystel oscillation section and the electrolictic capacitors and smd resitors

Posted on Sep 27, 2010

  • Anonymous Sep 29, 2010

    you must not use localy soldiring iorn on the motheboard it can damagfe ur board circuil you have to use smd rework station or bga rework station to remove or fix the components if yo hav mresk in the circuti it take longe time and stress to repaior the circuit you will need a high magnifing glass a god soldering iorn which temprature can be regulated you can conect the both end of the circuit using a thin wire it can be used only for a certain period or you need epoxy kit a microdrillsystem circuit track kit etc



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Panel light on Bosch microwave out but works fine. I'm just flying blind

I have had sometmes where bad solder connections on the display crystal stopped the display from working. May be worth a look at the connection on the main board where the display crystal is soldered to the board. If not, new main circuit board $$$$. Sharp uses a conductive rubber pad below the crystal to conduct power to the display. It is possible Bosch did something like that too. If so remove the main board, see how the crystal is connected to the board. Clean the rubber conductive pad or look for bad solder connections.

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My Bose clock radio, quite old model, has suddenly started losing about 45 seconds a day so in a week it's 5 mins slow. Any suggestions and preferably fixes?

Usually when a digital clock starts losing time like that its because the crystal thats used as a time reference in the clock circuit has started to age and drift off frequency. Other then repair/replacement of components there isn't much that can be done to it. I have a couple older LCD tv's with built in clocks that display the time on the screen that do the same thing, after checking the time base crystal in the circuit its simply due to the frequency of the crystal drifting with age.

May 04, 2017 | Bose Audio Players & Recorders

1 Answer

Matthias Hofmann suggested the X1=32.768KHZ crystal defective. How do I test this?

The purpose of a crystal is to regulate an oscillator circuit to the frequency of the crystal. It can also be used to filter a particular frequency from a mixed signal.

In an oscillator circuit, if the crystal is defective, the oscillator might still be working in an unregulated way or it might not work at all. If an oscillator circuit does not work it is just as likely to be one or more of the other components in the circuit that are faulty or a lack of supply current.

While there are probably modern solutions to the testing of a crystal-controlled oscillator or clock circuit, the original method would be to investigate the current supply to the circuit and check for function using an oscilloscope or a frequency counter. If the circuit seems ok but not oscillating the cystal is probably the easiest component to remove for testing, though it is probably easier and cheaper to simply replace it.
There are dedicated crystal testers available or it can be fitted to a known good oscillator circuit and checked as above. If the crystal is found to be ok (which is likely) the other components must be investigated/tested/replaced, which would be a highly specialised task and likely to be expensive.

Unless your motherboard is something really special and very expensive without many "miles on the clock" it is more practical, economic and convenient to consider the motherboard as a throw-away unit.

Apr 19, 2016 | Computers & Internet

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Add channels to a to make it 40 channels or a web page thanks happy happy knew year and healty

I\'m assuming you\'re talking about converting an old 23-channel CB to a 40-channel radio.

You didn\'t specify what kind of CB you have so it\'s impossible to say for sure, but it\'s highly unlikely that this can be done cost effectively.

Most 23-channel radios used a set of 14 (6 base + 4 transmit + 4 receive) crystals whose frequencies were added together to result in the specific CB channel you were wishing to use.

Adding additional channels would require multiple sets of crystals and a replacement of the front-panel switch assembly that selected them.

This is a lot of work and expense, and you would be left with a radio that would either be missing channels - due to the peculiarities of CB channel assignments - or would include frequencies that you\'re not allowed to use. In either case such a heavily-modified radio would likely be illegal to operate.

Most - if not all - 40 channel radios use a newer digital synthesis technique to generate the frequencies needed, so their circuitry is much simpler and less expensive to manufacture. If you\'re wanting 40 channels, it\'s time to put the old 23-er out to pasture and buy a new one. Amazon has basic models starting at under $40.

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Do frequency crystals need heat sinking to be soldered

They should just plug in!!! Just make sure the 2 prongs line up properly!!! might ave 2 bend one a bit....

Jun 29, 2014 | Syma Toys

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I have a galaxy 66. Sometimes when iI turn it on, It works fine. Them I will look at the frquency counter and it shows 24.340 and keeps changing. Does it intermittinly and I have had it looked at. At...

I would suspect cold solder joint at frequency Crystal or around L26 freq tx alignment point. Cold solder joints are basicly breaks in the solder or the 2 surfaces that were being solder were no equally heated when solder was applied. These tiny crack can expand with heat or develope corrosion that becomes an insulator. I suggest that you remelt the solder adding a rosin core silver solder in this area on trace side or have it done if you are not comfortable with soldering.

A good test is to remove speaker/component cover removed with radio upside down. Power up radio, antenna connected, mic gain down, key mic then lightly press down on the crystals there are 3 marked as X1 X2 and X4. Watch for devation on frequency counter.

It is unlikely that you have a bad crystal. I suspected voltage is dropped in this area it could be a capacitor. Since you mentioned Base i assume it is not mobile less likely it is cold solder joint.

Whatever the problem i suggest you go thru replacing capacitor it could make it much more stable.
Nov-2006 Stopped Production

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1 Answer

Remote control wont work

First of all checck your batteries and if possible replace. If not you will need to open the remote controller and check if any components have come off the remote due to a fall. You must try to look carefully and solder all joints possible specially the crystal and controller IC. Check the battery connections , clean if dirty. Now place back and use a multimeter to check for the IR when the pad is pressed. If it works and the TV does not respond you will have to check for IR detection inthe TV or a possible change of frequency in the circuit. It is possible that the crystal or controller could be defective. I hope you try this out. Good day

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1 Answer

Compaq presario 2127AD

Flickering may b due 2 ur Display configurations so u may also use some Display software or u may manually correct it.


1. adjust ur screen resolution

Change the refresh frequency for your monitor To change the refresh frequency for your monitor
  1. Open shortcutcold.gifDisplay in Control Panel.
  2. On the Settings tab, click Advanced.
  3. On the Monitor tab, in the Refresh Frequency list, click a new refresh rate.
note.gif Notes
  • To open Display, click Start, point to Settings, click Control Panel, and then double-click Display.
  • The default refresh frequency setting is 100 Hertz, although your monitor may support a higher setting. Check your manufacturer's documentation for information regarding the settings your monitor supports.
  • A higher refresh frequency reduces any flicker on your screen, but choosing a setting that is too high for your monitor can make your display unusable and cause damage to your hardware.
  • Changes to the refresh frequency affect all users that log on to the computer.

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1 Answer

Nebulizers problem

There are two main types of nebulizers: jet and ultrasonic devices. Jet nebulizers form droplets by using a compressor to deliver a pressurized jet stream of air down a narrow tube and through an opening. This creates a vacuum (through the Venturi effect), thus drawing liquid from a reservoir. The resultant small droplets of liquid are propelled out of the machine by the continued jet stream. Ultrasonic nebulizers produce aerosolized droplets using high-frequency sound waves generated by a special crystal. Liquid drug is usually delivered to the crystal, where it forms a thin layer. Electricity excites the crystals, causing them to vibrate at extremely high frequency. This vibration forces the thin liquid layer through an adjacent mesh, creating a fine mist. Droplet size varies with the frequency of the sound waves created by the vibrating crystals.

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1 Answer

NEC AccuSync 120 Frequency setting

This is the maximum resolution for this monitor:
1600 x 1200 / 76 Hz

Even if you lower the resolution to the monitor, as I can see that you want to do, the maximum refresh rate is still going to be 76 Hz. If you were able to force the monitor to scan a greater field rate and its protection circuits do not shut it down, the monitor will be damaged.

Your display card is most likely limited also, unless you went out and bought a very high end card.

When using a different resolution that what the specs on the monitor indicates as its native mode, this will reduce the quality of the results displayed.

Specs for this monitor:

Jerry G.

Apr 24, 2008 | NEC-Mitsubishi Nec Display Solutions...

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