Question about Toshiba 32A40 32" TV
I replace integrated circuit TA8427K = NTE158 Deflection Circuit Power Amplifier. Also check voltages all are ok. I don't have the squematic for this tv. any idea on what to do will be very helpfull.
If any one has a copy of the squematic by any chance you can email me at firstname.lastname@example.org
TV Thosiba 32A40 chasis #0017 .
Thank you all for your coments.
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
Posted on Jul 13, 2017
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Posted on Jan 02, 2017
If this is a CRT television, replace all electrolytic capacitors in the vertical circuit - this fixes 90% of all vertical deflection problems. The capacitors most likely t0 fail are low-cap, high-volt such as 3.3 uF at 50 volts, etc. Quicker and cheaper to replace them all, rather than tracing it down to the one bad part. Total cost if you do it yourself is about $15 tops, and make sure you install them correctly - electros have a plus and minus lead, and must not be installed backwards or you'll have serious blow-upage of the new parts. Before replacing the caps, however, go over all solder joints in the vertical section, reheat them and add a touch of fresh solder. You may end up not needing to replace anything.
Posted on Jan 02, 2009
If flexing the board will "fix" the problem, then the most likely issue is poor solder connections on that board. Look for any connections that appear grainy or have rings and resolder them. The IC involved here is the vertical IC which will be a small flat IC attached to a heatsink. It may be marked LA7837 or something similar and have about 9-11 pins.
Try the resoldering and update this with your results.
Posted on Mar 04, 2009
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