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Re: No Picture on Wharfedale tv
Appreciate the direct "Ask Me".
Your son's description of "...bang and smelt hot..." could indicate a number of possibilities:
power supply section;
horizontal section .
Since it has still sound, then the power supply is a least likely possibility. The "...bang and smelt hot..." is also significant. It tells us that we can visually check which component burst and burned by opening the rear of the unit for a look and see. Further diagnosis would of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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It sounds that there is loose solder terminals to the terminals of Chroma IC. Re solder all the terminals by applying a little more solder to each terminal. In practice, it will be very difficult to detect these type of loose solder points. The only way, is to re solder all of them at one time.
Make a fist with ur hand and bang on the tv bazel frame.The tv picture flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics have coldsoldering joints and requiring resoldering.If u bang on the tv bazel frame picture don't flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics are dead require changes those ics chips.If u don't have all the tools.Can't do a basic soldering work or able to changes those ics chips.Shop around for tv shops for estamate and repairing prices for repairing.
Make a fist bang on the tv bazel frame.See if u get a picture or flashes of a picture?If Yes,ur tv have cold solders joints on the tv video board,that the video board connected to CRT- tv picture tube.U have a soldering iron and a roll of sloders,also can u do basic soldering?Yes resolder all the Video sockets pins Holes that connected the video board to the CRT tube together.Tv shoud have picture again.
Rarely picture tube also shows the same symptom. High pitch sound is due to through deflection area LOT power supply is loaded. Compulsary horizontal output transister short. From your statement i think Lot puncture takes place. Change LOT and horizontal output transister and check tv is now working.
sounds like you have a frame fold-over fault, does banging the tv have any effect (slightly bang the set on the sides), if it does then its more than likely a dry joint, check all around the frame output chip, hope this is of some help to you