Re: Magnavox 32md359b/f7 White Screen and with sound only
On the 20k ohm range? Any decimal points to report? Most of those transformers look off (all are more than 3% out from each other) but the real bad one is probably the "13.87" one.
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Re: Magnavox 32md359b/f7 White Screen and with sound only
Can you show a picture of the meter in the setting you are using just so we can be sure it is OK. When probes are not touching do you see a "1"?
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Re: Magnavox 32md359b/f7 White Screen and with sound only
I am happy to help. Any TV saved from landfill is a victory.
All your transformers are fine they are well within spec. Next check, see picture. Use 200V DC range. I have no idea what it should be, other than around 50V, from what I heard of this chassis, but it is really unconventional.
I am suspecting you may have a broken CCFL tube inside the screen, but to find out you will need to take it apart - literally pull the LCD off - and it's not an easy operation and one that is easy to mess up.
Attached Files
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Re: Magnavox 32md359b/f7 White Screen and with sound only
We have seen bulbs on this forum which have cracked without obviously being dropped - at least according to the owners. I don't know how or why it happens, but it seems to be happening. Perhaps some internal pressure of small crack introduced at the factory damages them.
What is the voltage rating on that nearby big capacitor? 186V is very high. Far higher than I expected. Again this chassis is alien to me though so I am not sure what it should be.
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Re: Magnavox 32md359b/f7 White Screen and with sound only
It shoudn't be 186V then if the cap is only 100V rated. Maybe that test point is incorrect. I am checking the SM now.
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Re: Magnavox 32md359b/f7 White Screen and with sound only
It may be that I told you to test the wrong side. 56V seems much more reasonable I recall someone else here had around 50V.
I have looked at the schematic and they use a very dodgy feedback scheme which looks like it doesn't have a specified voltage.
There should be a pin marked BACKLIGHT-SW on the connector "CN201". Can you see it?
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