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#1
08-06-2008, 07:58 PM
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Found a 36" Sanyo AVM 3659G Won't power up.
The people I got it from said it flickered once, then went out for good. I plugged it in and heard a faint, high pitched sound coming from it. Pressing the power button did nothing.
Don't know when the TV was made, but it seems to be pretty new. 
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#2
08-06-2008, 08:49 PM
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That set probably uses a switching power supply. If it's making a high pitched noise, that probably means there is something shorted on the B+ line, loading down the power supply. My first checks would be the horizontal output transistor and the big diode in the B+ line.
You can probably get some semi-decent $ for that if you fix it. Around here, 36" sets still fetch $200+ in good condition. Don't know how long that trend will last, though.
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#3
08-06-2008, 08:51 PM
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It's in Sams 4404 (too new for me). That set was probably made in the early 2000's.
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#6
08-07-2008, 02:51 PM
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Yep. Found a large 3 pin transistor near the flyback. (Q 404 ) It reads as a dead short on all 3 pins.
I can't really make out the numbers on it. I'm wondering if I can substitute another HOT from the board of another 36" TV? Hell, what do I have to lose?
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#7
08-07-2008, 03:32 PM
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Since I couldn't obtain a part # off the old HOT that I removed. I went and put in another HOT from a different TV chassis. However, I have NOT plugged the TV in yet.
What's the worst that could happen? My guess is the worst that could happen is the new HOT would short. Should I take some precautions before plugging the TV in?
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#10
08-07-2008, 04:44 PM
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Okay. Plugged it in, and the TV worked!... for about a minute.
The picture was concave, but it was there. After a minute, the TV shut down and that noise came back. The second it did, I unplugged the TV. So all this TV needs is a better HOT...
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#11
08-07-2008, 05:31 PM
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If the picture is concave, you have problems in the horizontal circuit. Probably bad caps around the flyback and HOT. These won't be electrolytics. They will be low value capacitors probably rated at a high voltage. If there are any diodes in that area, check them also.
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#15
08-07-2008, 11:53 PM
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I checked tritronics website and the HOT should be a 2SD1880. An NTE2353 is the generic sub. This HOT does have the damper diode built in. The 2SD1554 is the same as an NTE2331, which is not as heavy duty as the NTE2353.
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