magnavox 37MF321D/37 no power

[johnboy1313]

Re: magnavox 37MF321D/37 no power

Every set that I've fixed had that chip go bad. Do a search for IC7003 or LD5973D there is a capacitor that may need to be replaced as well.

[budm]

Re: magnavox 37MF321D/37 no power

https://www.badcaps.net/forum/showth...ghlight=IC7003
Read post 23 about bad cap.
and this one by Johnboy:
https://www.badcaps.net/forum/showth...light=l5973%2A

[rsrace]

Re: magnavox 37MF321D/37 no power

Many thanks Johnboy and BudM. I think I will take a shot at the IC7003 replacement (and the associated capacitor). At the price of the main boards available right now, this seems like the way to go.

I will also check the outputs of the IC to be sure that nothing is shorted...both boards look like they fried right between pin 7 and 8 as shown in many of those other posts I found in BudM's reply and a search I did of the forum.

Those chips are cheap and easy to replace. Buy two chips and a heat gun. Fix both boards, use one, and sell the other.

I like the way you think Johnboy - I need to recoup a bit from this ordeal and it would be nice to sell a verified-working main board to help.

When you say heat gun - do you mean an industrial "hair drier" like is used for shrink wrap and such (I have one)? Is that to release the IC from the circuit board? I assume I do not need to seat the new one with heat as that would likely overheat the IC...?

I also saw a tip on another post from BudM to cut the legs off the IC first to make removal easier.

[rsrace]

Re: magnavox 37MF321D/37 no power

Nailed it! All is working now after replacing IC 7003 and capacitor 2002!

One of the two main boards I "fixed" did not have any standby after replacing the IC, so I need to go back and figure out what I messed up (because that's a change from low volts). I bought one extra IC and cap from digikey so I might just have to start the soldering over again.

The other board fired right up and I have picture and power lights again...it has been running for hours now.

Many thanks BudM and Johnboy1313 ...I could not have done this without you!