I replaced a burned up D409 and vertical IC, got it to stay on and picture is back fine now (menu works fine, picture is perfect). However, nothing seems to be coming out of the tuner, or at least the RF input section. I see the channel on the screen, but it finds no channels. No snow, no noise, nothing. Any thoughts? Thx!
Philips Magnavox TR2502 Chassis 25B800 tuner issue
Aug 19, 2004
1 Replies
Did you check the voltages at the tuner module to see if there is anything supplying it? This includes checking if the AGC bias to the tuner is also correct.
Did you check that in the TV mode, that the source switching circuits are infact working correctly to pass the video signal from the decoding (output of the IF detection) through its proper path?
If the above complies, then check to see if the IF module is getting the proper supply. If so, then you will have to feed a known signal in to the tuner section, and use a scope to see if there is any output from the tuner. Then follow through the IF stages. Following the schematic, and careful evaluation of the bias voltages, and signal paths would be the key to finding the fault. There is no simple answer for this, unless it is just a missing DC voltage supply to the IF or tuner sections.
Jerry G.
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"Lee" wrote in message
news:c438d194.0408182055.5c17ec50@posting.google.com...
I replaced a burned up D409 and vertical IC, got it to stay on and
picture is back fine now (menu works fine, picture is perfect).
However, nothing seems to be coming out of the tuner, or at least the
RF input section. I see the channel on the screen, but it finds no
channels. No snow, no noise, nothing. Any thoughts? Thx!
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