Hello, I posted this earlier but it applies in this case so here goes,
The chirping sound is either a shorted Horizontal Output Transistor (HOT) / Power FET (whichever one is used in this case) or the IHVT (Flyback Transformer) has developed a short in its windings. In ether case both components will have to be replaced. I would suggest you have a qualified TV technician come over and troubleshoot the problem and give you an estimate on the repair. However, if you are doing this repair yourself take into mind that the HOT and the IHVT (flyback) are in a series circuit configuration and if the Flyback is bad I would change out the HOT also, and vice verse.
I post this only because I have seen this path taken before and it does get rid of the symptom, but it does not get rid of the problem. The convergence IC are usually tied to the same power supply as the Horizontal Output Stage and when the ICs go the cause excessive current through the IHVT causing it to develop a short circuit. That is what actually causing your TV the chirp. If you just replace the Convergence IC your set may work but in a sense you have a ticking time bomb on your hands, because of the IHVT then is functioning with a shorted winding.
That is why troubleshooting is very important, to find the true cause of a problem, and not just to fix a symptom. Just remember, if you replace the ICs, keep your eye on the set and if another outage happens look at the HOT and the IHVT as possible candidates for replacement.
That is why at my shop we try to get the customer to buy a maintenance plan, because a TV like any thing else has to be maintained for proper service.
Answers & Comments
Hello,
I posted this earlier but it applies in this case so here goes,
The chirping sound is either a shorted Horizontal Output Transistor (HOT) / Power FET (whichever one is used in this case) or the IHVT (Flyback Transformer) has developed a short in its windings. In ether case both components will have to be replaced. I would suggest you have a qualified TV technician come over and troubleshoot the problem and give you an estimate on the repair.
However, if you are doing this repair yourself take into mind that the HOT and the IHVT (flyback) are in a series circuit configuration and if the Flyback is bad I would change out the HOT also, and vice verse.
I hope this helps,
Thank you,
Shuttle83
http://www.electron-age-technologies-llc.com
Hello,
I post this only because I have seen this path taken before and it does get rid of the symptom, but it does not get rid of the problem. The convergence IC are usually tied to the same power supply as the Horizontal Output Stage and when the ICs go the cause excessive current through the IHVT causing it to develop a short circuit. That is what actually causing your TV the chirp. If you just replace the Convergence IC your set may work but in a sense you have a ticking time bomb on your hands, because of the IHVT then is functioning with a shorted winding.
That is why troubleshooting is very important, to find the true cause of a problem, and not just to fix a symptom. Just remember, if you replace the ICs, keep your eye on the set and if another outage happens look at the HOT and the IHVT as possible candidates for replacement.
That is why at my shop we try to get the customer to buy a maintenance plan, because a TV like any thing else has to be maintained for proper service.
Thank you,
Shuttle83