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55" magnovx siren code4 str up caps,but they look fine.2 diodes burnt and missing(d924&d906)?can u tell me their particulars*mod.47mf437b/37b

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Posted on Jan 02, 2017

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SOURCE: have a magnavox 47mf437b no picture has green

Please read my guide first:
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
Failed TV and Monitors:

Learn about bad caps:

Capacitors kit: he can make you a set of caps.
Or just make sure to use caps with low ESR, 105c rating such as PANASONIC FM or FC series.
Please post back what you find.

Posted on Dec 06, 2010

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I have a Magnavox 37mf337b/37 tv that wont power on. I need the part name and number for diodes zd906 and D924 that are located under the transformer.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Circuit diagrams of SMPS section and main board of many popular brand devices are given. Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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Hi i have a alba tv Model number LCD32880HDF afer 10 seccond the display turn off but the sound no what is the problem???

power supply 17ips10-3 v.1,mainboard 17mb45m-2

the power supply has intergrated inverter bit of a pain,no markings for voltages etc,also used in bush,sylvania etc,it has a touch panel on the side for the usual adjustments ,.

these NORMALLY suffer with the inverter output ceramic caps (3kv),on c231 &c230,an insulation test confirmed they were fine,and capacitance was within tolerance,all other lytic caps tested for esr returned good results.

it had all stable voltages ,but no voltage in inverter section??although a fluctuation on the standby voltage was due to the led's flashing in time with the flucuation.

it was hit and miss knowing what voltage goes where,it is a vestal afterall!things seemed fine as a guestamite.

to do component testing in the area of the inverter, from the smpt there are 2 ultra fast recovery diodes in parallel .

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I need a power supply board # 080GL19X01LT

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Check out this replacement PCB for $88. It isn't available for shipping until March though.

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Hi I've replaced the final with rf 520 & some caps etc, but now the niddle is not moving can you tell me what is wrong or what should I do thanx George.

Check the polarity of your caps (not ceramic of course they are not polarized) and the compansion parts or diode if you built your own. The diode banded end should be toward front of radio.
Check that you have not bumped that pa switch it has happened to me numerous times.
Just a side note after go back thru your work and it starts swing again if it is a china made you may need to remove a turn off of L14 to get max swing. Dont leave the plug out it creates harmonics!!
I like this mod site it has a mosfet mod without compansion parts Good luck

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Ice 2as01 is broken again

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TV shuts off after 2 to 30 minutes

Octo, I'm afraid this one is something you'll have to bite the bullet on and take to the shop. For now it sounds like a bad cap that's going thermal. Meaning that it heats up beyond it's tolerance range and allows the voltages in that circuit to go too high, causing the x-ray protection circuit to shutdown the unit. Because the cap is already warm when you try subsequently it takes less time for the protect circuit to react. A shop will ESR the caps in the suspected circuit. My first suspect would be the SMPS (switch mode power supply). And they would also check the following: Z00451 - I901 Hybrid Ic Str-M6811a 2000465 - 3 Opto-Couplers Ps2501-1 2348253m - D906 Zener Diode Mtz-J22cta 2312171 - Q901 Transistor 2sc3852 2381349 - I905 120v. Hybrid Ic Se120n I doubt seriously any of these would need to be replaced from your description of the symptoms. But if it progresses to an instant shutdown you could have damage to some of the above. Sorry for the less than good news, please don't kill the messenger, but it's not too expensive if it's just caps. Find a reputable shop in your area and take it to them, it will save a few bucks. Good Luck Bill

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