Hey guys, I tried posting this in an existing thread but got no replies, so I'll try a new one.
Found a Magnavox LCD 47mf437/37, LED lit up when plugged in but wouldn't turn on. When power button was pressed, the LED would change color, still wouldn't turn on, but would chirp.
Has power supply 715T2454-2 S/N 07386. It looks a bit different from the other ones I've seen pictured on various threads. For starters, the 3 tall caps at C952, C951, C953 were all PF nichicon caps, and the one at C955 was a VR series Nichicon. The soldering job looked sloppy so not sure if it was a repair job or a revision of sorts.
I replaced the two zener diodes at ZD904 and ZD902 because they were burnt. I also replaced all the other caps (besides the 4 Nichicon and big 450V Capxon one) on the board with the same rating Panasonic or Nichicon ones.
The TV now works, but there is a very high pitched whine when it is plugged in, and slowly dissipates after it is unplugged.
I've just taken the heat shield off the main board, and found three swollen caps at C113, C131, and C830. I am obviously going to add these caps to the list of things to replace. Should I check other caps on the main?
I'd like to sell this TV, but don't want to sell something that might crap out. What else can I replace to make this thing bulletproof?
I've seen some people replace:
diodes D925, D912, D907, D926, D928
Mosfets Q901, Q902, Q917
Those Mosfets are kind of expensive, so before I replace, how do I test? I have a DMM and an ESR meter on its way to me (finally).
Cheers,
Alex
Found a Magnavox LCD 47mf437/37, LED lit up when plugged in but wouldn't turn on. When power button was pressed, the LED would change color, still wouldn't turn on, but would chirp.
Has power supply 715T2454-2 S/N 07386. It looks a bit different from the other ones I've seen pictured on various threads. For starters, the 3 tall caps at C952, C951, C953 were all PF nichicon caps, and the one at C955 was a VR series Nichicon. The soldering job looked sloppy so not sure if it was a repair job or a revision of sorts.
I replaced the two zener diodes at ZD904 and ZD902 because they were burnt. I also replaced all the other caps (besides the 4 Nichicon and big 450V Capxon one) on the board with the same rating Panasonic or Nichicon ones.
The TV now works, but there is a very high pitched whine when it is plugged in, and slowly dissipates after it is unplugged.
I've just taken the heat shield off the main board, and found three swollen caps at C113, C131, and C830. I am obviously going to add these caps to the list of things to replace. Should I check other caps on the main?
I'd like to sell this TV, but don't want to sell something that might crap out. What else can I replace to make this thing bulletproof?
I've seen some people replace:
diodes D925, D912, D907, D926, D928
Mosfets Q901, Q902, Q917
Those Mosfets are kind of expensive, so before I replace, how do I test? I have a DMM and an ESR meter on its way to me (finally).
Cheers,
Alex
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