Re: Magnavox 42MF521D/37B
Did you miss Tom's post where he said it could be the startup cap?
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Magnavox 42MF521D/37B
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Re: Magnavox 42MF521D/37B
Following a test that Plainbill suggested in another thread on one of these i came up with a low voltage and fluctuating readings.
https://www.badcaps.net/forum/showpo...2&postcount=13
DC1 19-23v
DC2 20v
In the 2nd pic it shows the voltage for the inverters. Should i be getting any reading on the middle 2 pins?
I'm not sure what i should be getting on the pinout for the logic board or what is what. The wires alternate red/white/red/white etc so I didn't poke around there.
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Re: Magnavox 42MF521D/37B
That is flux that was on there and the pic. Some joints did have a bit too much solder and those pics are from before i capped it.
The fuse was the first thing i checked.
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Re: Magnavox 42MF521D/37B
No didnt mean that - see attachments I meant the red circled bit in reflow2
In reflow I have marked in red something which looks a bit burnt - is it just the pic.? I have also ringed joints in pink on both that could probably do with
re touching but again it could just be the pic.
EDIT
If the back light doesnt come on at all have you tested the white block fuse on the inverter board.
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Re: Magnavox 42MF521D/37B
Originally posted by selldoor View PostAs you say pics are not great however can you look near pin 11? on the big transformer
there is something doesnt look quite right as though it might be shorting/arcing.Last edited by junktv; 05-30-2012, 06:07 AM.
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Re: Magnavox 42MF521D/37B
As you say pics are not great however can you look near pin 11? on the big transformer
there is something doesnt look quite right as though it might be shorting/arcing.
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Re: Magnavox 42MF521D/37B
Check you're getting a good +24V going to the inverters.
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Re: Magnavox 42MF521D/37B
Well i tried it and at first the power button lit up and got bright staying on like it should when working fine but the screen never lit up. I turned it off and realised i forgot to plug in the left inverter. So i unplugged it, let it sit for a bit and plugged in the inverter to try again. This time it acted like it did originally where the power light blinks and won't shut off after being pressed.
Sorry for the bad pics, all i have is a cell camera.
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Re: Magnavox 42MF521D/37B
Just checking for a manual again incase someone has one that wasn't on last week.
I have the new caps in now just haven't tried it. To clarify post #6 i tested the diodes still in the board.
Tom66, I'll get some pics tomorrow before i try it.
Thanks
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Re: Magnavox 42MF521D/37B
Originally posted by retiredcaps View PostThis power board probably has the same suspect diodes 6054, 6055, and 6056 as the Philips models.
All diodes seem to read one way but some do climb. Those you listed are 500-600 and steady.
The frame does have a LG.Phillips sticker.
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Re: Magnavox 42MF521D/37B
This power board probably has the same suspect diodes 6054, 6055, and 6056 as the Philips models.
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Re: Magnavox 42MF521D/37B
I looked also and this board isn't labeled for + and gnd.
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Re: Magnavox 42MF521D/37B
Both of those caps are suitable replacements.
If you have a digital multimeter, you can check if the PSU outputs are in spec - if the caps are bad, they will usually read low.
No luck finding a service manual on my favourite sites.
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Magnavox 42MF521D/37B
Anyone have a service manual for one of these?
Trying to see if I can fix this for a friend of the family. Symptoms are a steady flashing power button after it is pushed with no picture or sound. Has the normal bad caps and seems the diodes check out.
I was able to find the spec sheet for the capxon gf caps so have 1 P12384-ND and 3 P12409-ND for replacements in the cart.Tags: None
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