Question about Creative Labs MegaWorks 510D Speaker

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No output, bad cap 2200 ufd @63 volts need schematic to trouble shoot MEGAWORKS510D.

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  • icwyatt511 Jun 07, 2011

    Need Schematic to find values of R 26 and R 29 Bridge rectifier is OK on MEGAWORKS 510D

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Doesn't appear to be a schematic online. That cap is likely a filter cap for the power supply. Trace back to find diodes in supply. They may be in a bridge rectifier module or individual diodes. You will likely find one or more bad. If one went bad, others may be degraded so replace them all or the module. The amp chip in this may have taken a hit too. They may be in the TDA family such as a TDA2050 or the smaller cousins. When cap and diodes are restored, use a series 40 watt incandescent lamp in series with the power line to limit current until all is well. It will limit current and protect components and fuse should there be another problem.

Posted on May 24, 2011

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1 Answer

Cb is recieving but not trnsmiting


Ah! these and the cobra 2000 had the same board and same problems--

Some will have no transmit audio (check or sub to make sure microphone not the problem) and others no receive audio.

If circuit problem both are caused by a filter cap that opens.

Usually this occurs when radio has not been used for a long period of time.

If you have a schematic for the radio (mine are all out of reach) you will find in the audio circuit a cap (I think it is 220 uf at 10 volts) right near where the volume is controlled that is bad.

The no transmit audio problem is another cap in the mic circuit.

I hope this helps you as it is likely your problem--note if the audio output IC was bad no receive or transmit audio.

shoot me a question by using the make comment if you need further help.

73's

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1 Answer

A big hum of 100 c/s in the output,i need the schematic for repair


You must be on 50Hz power. You don't really need a schematic to repair the unit. Since the hum is twice power line frequency, the likely cause is the electrolytic filter cap for the high voltage has failed. The cap should be obvious in the unit. It will be near rectifier diodes and have a voltage rating above 50 volts. To test, bridge the one in there with another cap observing the correct polarity. If hum changes, replace the original cap.

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I can hear power to the tv but when I push the power button the picture does not come on.


You have bad capacitors in this TV. I Have not repaired this model for quite some time. I do remember there are few caps to look for. I don't remember locations. But look for a 160 volt to 250 volt cap at 1 Mf. Look for a 200volt 100MF and a 200 volt to 250 volt 2.2Mf cap. And be sure to check all grounds to ICs attached to heatsinks. And there might be a 63 volt at 10Mf that is bad as well. These are all rated at 105 degrees. Anyway these are very good clues to get started with. I don't believe you have any bad ICs yet.

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I had two westinghouse 20v5 monitors do this also just over a yr


this is eric. I posted my solution as a problem by mistake. read above and enjoy

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Bad caps


Good Day, newgman;
Yes, this is what MIT. says , you might call it a modification.

Good Luck, big IRISH.

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VZ7 chassis problem began with rolling picture and now protection kills power on process


Good Day, NT-Services;

You may a vertical problem but I think it's not the vertical output amp. The problem should be in the voltages feed the vertical circuit. I have had cocern many times, so try this first:
1. VERTICAL ROLLING, VERTICAL BLANKING BAR LOCKING IN THE MIDDLE OF THE PICTURE, ALSO MAY HAVE HORIZONTAL PULLING OR TEARING. CHECK C2C52 10 UFD @ 50 V OFF THE BASE OF Q2C51 ON THE SIGNAL PCB. 2. CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01 AND IC2P01 PART # 270P466020 (9-VOLT REGULATOR). BOTH ARE ON THE SIGNAL PCB.

Replace these caps no matter how they check.

2. Shuts down; may be intermittent, self-diagnosis ERROR 23 or 24. Check solder connections at connector "DY" on the yokes. Or/and check C411 2200 UFD 35V AND C412 10UFD 50V, both located on the main PCB.

3. Service adjustment codes:
a. Option menu; press MENU 1270
b. Service menu; press MENU 1257.

I hope this was helpful. Good day, big IRISH.

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1 Answer

Shaking screen


Check the 9v regulator Ic2p01 on the signal board for correct regulation 8.9 to 9.1 volts. If voltage at the output is under 8.9v, replace the regulator Ic. Always replace C2p05 100 Ufd 16 V on this set and that should take care of the shakes but you may want the tech to go ahead and ESR some of the other troublesome caps throughout the Tv. He'll know what you mean. Many of the 100mf caps replace automatically. Several others will have a questionable ESR and should be replaced. Caps are inexpensive, but probing with an ESR meter is somewhat labor intensive so you miht discuss with the tech just how far you want him to go testing for bad caps.
A Mits is a great Tv and this repair is clearly worth it..
Bill

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2 Answers

NO PICTURE


your tv most likely has a bad vertical chip or cold solder on this chip. Another thing is that the connections on the vertical yoke connectors are broken and need to be resoldered....John

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