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Tv repair i have a nec tv model fs68v81s sound ok no picture how can i test the video drive and the sreen volt with multi meter thank you

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You can try to check if the problem is near flyback transformer
you ha to disconnect the power cord , open tv and locate power
transistor for generate high voltage it is near the big four connector 
cable the transistore you have to dissolder from board and check
with multimeter if it is shorted or not in this way base to collector
junction about 500 or more base emitter the same  collector to emittor open - delfo

Posted on Mar 21, 2008

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Look up the model of your tv. A lot of the problem on these 50 inch tvs can be fixed pretty quick. If you know how to safely use a multi-meter the first thing I would do is unscrew the back of the tv and check all fuses. Only do this after you have checked all connections going into and coming out of the tv to make sure they are secure. MAKE SURE IF YOU DO ANY TESTING THAT THE TV HAS BEEN OFF AND UNPLUGGED FOR AT LEAST 5 MINS. once you get the back off check for any obvious burn marks, bulged or leaking capacitors and fuses. If all checks out you will have to test further (if capable) or take it to a TV/ Electronics repair shop. Also check you tube for your brand and model number. they usually have some good videos
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When convergence out ICs stop working in rear projection TV, picture looks 3D affects.
Need to test/ check supplied volts on convergence out ICs on main board and if volts are OK, replace both ICs.
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ok the problem u have is that u need to have a scope and a volt meter to test the circuits what i would do is check and see if u have a 130 v on the horiza output transistor first. but if u dont have any meters there is nothing u can do to fix the problem. and just rember that phillips allwas wonts u to buy the board that is y it is not cheep to repair a magnavox or phillips sometimes u can buy another tv lot cheaper. i hope this help some what marty.

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Sony trinitron model 32S22


Hello RENE1223,

This problem is related to the HV section of the TV or the picture . The fact that you have sound means that the power supply is working and this means that the HV section is partially working. You can not repair this yourself, because you will need to test points where the voltage can reach 40KV that is 40,000 volts. I would suggest that you take the TV to a qualified TV repair shop.

I hope this helps
Thank you,
Shuttle83

Mar 26, 2008 | Televison & Video

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