Question about Philips Magnavox 51MP392H Rear Projection Television
I have a convergence problem with the subject TV. I changed the convergence amps and even changed two resistors that appeared to be burned (although they tested good once out of the circuit) but there is still a convergence problem.
Prior to changing the amps I believe the green convergence was out (curved up in the corners at the top and up in the middle at the bottom). I didn't fix it right away and then one day when I turned the set on the power started rapidly cycling off and on. I had to unplug the TV to get it to stop. I figured one of the amps or a resistor shorted and was causing an overcurrent, so I went ahead and changed the amps. Now, after changing the amps, both the green and blue convergence are out (green is flared out on the left and blue is flared out on the right).
The convergence went out once before on this TV and I replaced the convergence amps following the instructions from a FixYa post and it worked fine. That time I used what I thought were original Sanyo STK392-120s (they lasted less than 1 year, so maybe they were actually generic). One difference this time is that I used STK392-180s because I read that they are a drop in replacement but are more robust. I'm wondering if that could be the problem. Any help would be appreciated.
I always stick with the OEM stk #'s - for one..... also it sounds like you may have some damaged resistors in the convergence section. Pull one leg of each resistor and measure the impedance of each one to make sure they are in spec.
If you need a service manual, go to techlore.com , click the Resources tab, then click technicians corner. You will be ale to click "see all downloads" and look for the magnavox 52mp392h/17,
or you can try this link:
hope all this information helps!
Posted on Jan 17, 2009
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Posted on Jan 02, 2017
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