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I had the blinking power light problem with my magnavox 37mf321 flat screen. I replaced the 2200 uf capacitor and it worked great for about 6 months. Now the tv will not power up again. The green light turns on solid and the screen will flash randomly about every minute or so? More power supply problems? I did use a 2200 uf 50v rated at 85* instead of a 2200 uf 25v 105*. Could this be the problem?

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  • spunwell Aug 29, 2010

    The green light was blinking before I replaced the capacitor. This time it is not blinking it stays on solid, does this still indicate power problems?

  • spunwell Aug 30, 2010

    The first answer addressed the blinking light problem which I mo longer have. My question is with the light being on solid and the blinking screen. Does this indicate a repairable problem, and where should I start looking for it?

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  • Master
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Yes for sure, you simply MUST NOT ever, use a Lower rated capacitor ever. I suspect, it may have failed again? Also the temperature rating is critical too, that's the 105 or 85, that's degrees C. It must be same or better. However what you replaced it with, should be OK, but the temp rating is way too low.
Also the capacitor is only the symptoms,NOT the cause. Capacitors DO NOT usually spontaneously fail. There MUST be a "Cause". It is this "Cause" that must be discovered, and Fixed, usually we have two things to repair when we have a fault. The Cause, and the damage done from that Cause.
With capacitors, it is usually AC "Ripple" that damages and eventually causes failure, that "Cause" for the "Ripple" must be found and Fixed, or it will simply cause the problem to resurface, after the new capacitor has been replaced.
It maybe leaky Diodes or bridge rectifier, other bad capacitors, other bad semiconductors, Vregs etc. As related this all must be fixed before fixing the symptom.
You MUST get a service manual, to be able to successful effect any repairs.
service manual link below.
http://www.eserviceinfo.com/equipment_mfg/MAGNAVOX_2.html

Posted on Aug 30, 2010

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  • Master
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Hi.

The blinking light is not telling you that the PSU is fried, and that you need to replace the capacitor. The blinking light is protect mode and is simply telling you that the PSU is getting forced to shut down because a wrong voltage had been detected by main chip on main controller board.

The 2200 micro farad cap is common cause for the problem , but it is not necessarily again the cause for the problem, and it may ahd not been the only faulty part in your set.
When problem is the capacitor you may usually notice that the capacitor is bulged, or leaking.

The original 25V capacitor can be replaced with a 50V 85 cap, that is more resistant to over voltage, the capacitor will work in the same way on the circuit, it will only blow less easily.

The minor chance that the cap blows, is the only difference. In this way the only property affected is the property of the cap of working like a fuse, preventing further damage. The 50V cap will work even better than the 25V cap to any other effect.

Replace again the cap, inspect other capacitors on power board and read Ohms on power board resistors to find out if they are OK.

The capacitor may have blown again because of problems related to power line stability, check wall plug grounding and use a surge protector.

If that does not work you will need to test in full PSU, main board and inverter in full. Here some general indications on testing procedure A full test on PSU and inverter

Posted on Aug 29, 2010

  • Ginko
    Ginko Aug 29, 2010

    The blinking light indicates that there is a problem, it does not address in any way the PSU, simply PSU capacitors is the most common occurrence, and often DIYer assume that the blinking light is addressing a power issue.

    The solid light instead indicates that the TV does not detect a fault. If there is no display this often means that either inverter or main controller board is fried. The first part to test is always PSU, by reading voltages. That is more difficult than many newbies can think, since voltages are often not active when there is a fault, and control lines must have low voltage on to keep single voltage outputs from PSU on.


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