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I just replaced the D10 shorted HER304 but now I don't have sound on the tv

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Hello
First check that any muting control is not activated. This might be a button on the remote or set itself. If you have a headphone jack, it may have dirty contacts as plugging in a headphone usually mutes the speaker.
This you have to do by opening the back cover of the television.

If the set is mono or only one channel of a stereo set is out, then check for bad connections to the loudspeaker. Test the loudspeaker by disconnecting one of the wires (with the power off!) and measuring its resistance with an ohmmeter (it should be less than 100 ohms - probably less than 8 ohms). Or momentarily touch a 1.5 volt battery to the speaker terminals - you should get a click or pop from the speaker.

Next, trace back from the speaker output terminals to the circuit board and look for bad solder connections or a loose or dirty connector.

If these tests do not reveal anything, you probably need a scope (or audio signal tracer) and schematic. Or at least the part number off of the chip. Is the final amp a chip also or just a transistor? Have you tested the transistor? If there is little or no buzz from the speaker, that would indicate a problem fairly near the output. If the tuner/if were bad, I would expect some noise/hum pickup from the low level audio stages. Get the part number off of the chip. If it is in a socket, check the contacts for corrosion or looseness.
Thanks for asking...

Posted on Jun 06, 2010

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Same problem.


D10 is shorted. HER304 in middle of Power supply board near large electrolytic cap. Replace with Radio Shack 276-1144 3A 400PIV Diode. PLEASE BE CAREFUL WITH HIGH VOLTAGE PRESENT ON POWER SUPPLY BOARD. UNPLUG POWER CORD!!! OBSERVE PROPER POLARITY WHEN REPLACING DIODE-LOOK WHERE THE BAND IS.

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No power inside tv outlet is good and fuse is good. power cord is plug in on both sides.


D10 is shorted. HER304 in middle of Power supply board near large electrolytic cap. Replace with Radio Shack 276-1144 3A 400PIV Diode. PLEASE BE CAREFUL WITH HIGH VOLTAGE PRESENT ON POWER SUPPLY BOARD. UNPLUG POWER CORD!!! OBSERVE PROPER POLARITY WHEN REPLACING DIODE-LOOK WHERE THE BAND IS.

PS- I just fixed the same model this morning.

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Bought Memorex MVD2059D 20" tv w/built in DVD player 7-21-09. Did not take out box until I drove my son 4 hours away to college on 8/22/09. TV worked 8/22/09 and on 8/23/09 the power went out and tv never...


IF the Standby Red Light does not come on when you plug in the TV:


1) Check fuse on back panel next to power cord. Pull out cord and pop fuse holder out. On an ohmmeter, it should read 0(short)-that is a good fuse.

2) Check the fuse on power supply board next to power connector. It is soldered onto board.

3) Be careful with this step: With all boards screwed in place, plug in TV and then unplug it. Next take a Voltmeter set on 200 Volts and test large electrolytic cap in middle of board-should have @100-200 volts on it. Do not short the capacitor-big fireball flash explosion if you do!

If 1-3 test OK, then:

D10 is shorted. HER304 in middle of Power supply board near large electrolytic cap. Replace with same diode or Radio Shack 276-1144 3A 400PIV Diode. PLEASE BE CAREFUL WITH HIGH VOLTAGE PRESENT ON POWER SUPPLY BOARD. UNPLUG POWER CORD!!! OBSERVE PROPER POLARITY WHEN REPLACING DIODE-LOOK WHERE THE BAND IS.

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D10 is shorted. HER304 in middle of Power supply board near large electrolytic cap. Replace with Radio Shack 276-1144 3A 400PIV Diode. PLEASE BE CAREFUL WITH HIGH VOLTAGE PRESENT ON POWER SUPPLY BOARD. UNPLUG POWER CORD!!! OBSERVE PROPER POLARITY WHEN REPLACING DIODE-LOOK WHERE THE BAND IS.

PS- I fixed this model this morning.

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D10 is shorted. HER304 in middle of Power supply board near large electrolytic cap. Replace with Radio Shack 276-1144 3A 400PIV Diode. PLEASE BE CAREFUL WITH HIGH VOLTAGE PRESENT ON POWER SUPPLY BOARD. UNPLUG POWER CORD!!! OBSERVE PROPER POLARITY WHEN REPLACING DIODE-LOOK WHERE THE BAND IS.

PS- I just fixed this same problem this morning on same model.

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Please call Memorex customer service at 800-919-3647.

Unfortunately, what you're describing is a repair issue. You won't be able to address the problem with troubleshooting. There is a part inside the TV that needs to be replaced. If the TV is less than one year from the date of purchase, it is still under warranty. Call the number above so that you can have the unit repaired.


I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

Please post a comment if you need additional assistance so that I can help you further.




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If you have a D10-300, use this manual.

Look in the "System Preferences" section.

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