We replaced the transformer for our RCA F27650. It was sparking and now it is not, but now the screen won't turn on. It is just black. We hookd all the wires up like they were. we can hear sound, but no picture. Can you help?

Hello
Flyback transformer other wise called Line output transformer {LOT} is actually a step up transformer, which supplies extra high tension voltages to the guns. It can be locatee on the main printed circuit board. Just see the different views of the main board of your RCA TV. You can see the flyback transformer at the left top corner, look like a large black componen; with a ferrite "U" type core goes though it. It is the LOT. Line Output Transformer, otheriwse called as Flyback Transofrmer. OK.

the high pitch squeal indicates shorted component/s. the transformer goes hot co'z its being overloaded by the shorted component, it too could be the one creating the squeal!!

if you have experience with electronic troubleshooting, try to test some of the components particularly on the secondary part of the transformer.
Be careful and make sure the TV set is unplugged.
test for shorted diodes and transistors, if you're in doubt of your readings try to desoldering one leg of the diode then proceed with the testing/measuring. replace any of the bad components you find exactly with same part number or replacements with the same rating.

spend more time on it resoldering some other cold soldered components.

Hello ddw7321,

This sounds like it could be a malfunction in the High Voltage section of the TV. The shutdown circuit is switching on and preventing the TV from turning on. This might be due to an excessive amount of current flow possibly caused by a shorted turn in the Integrated High Voltage Transformer (IHVT), or a shorted Horizontal Output Transistor (HOT). To test this you will have to unplug the TV set, and with a multimeter set to resistance, measure the resistance from the collector of the HOT to ground, If it reads 0 ohms then that is the problem (a shorted HOT). The next test which is of the IHVT is a little difficult because it requires removing the IHVT and doing a ring test. At this point I would like to suggest that you take the TV to a repair shop, because these next test might be difficult for someone who does not know electronics, and if you have no knowledge of electronics you may do more damage then good.

With that being said:

Remove the HV anode of the IHVT connected to the CRT by first using a large flathead screwdriver connected with a clip lead to the ground of the TV, by sliding the screwdriver under the rubber cap and releasing the clips. Then unsolder the pins on the bottom of the IHVT using a soldering iron and a suction type desoldering pump. when the solder is removed , pull the IHVT from the circuit board. locating the main primary winding connect it to the device that you are using to perform your ring test (I use a Sencore LC-102), when it is connected do the ring test and it should have at least 10 rings to be considered good, any less then 10 and the IHVT is to be considered as bad.

I hope this helps.

Thank you,

Shuttle83

I have a RCA Entertainment Series 32' Model Number F32650Y01E024C226E just stopped working. no picture, just a chirping loud noise that came from the back of the tv.
Any suggestions?

its probably the transformer in the unit has blown out
you will need to try and find a replacement

No, the tube is not bad. There are a couple of very small surface mount components mounted by the main microprocessor that could be causing what you are seeing. They are very small and quite hard to unsolder and replace without losing them. The set should be serviced by a qualified tech familiar with the new RCA chassis.

The model you listed, F27650 uses the new ATC113 series chassis, which is only about 3 years old. The ATC113 chassis is not known to have snowy issues, but if yours is then I would suspect that a solder joint is loose in the tuner. If your set is actually around 9 years old, then it might perhaps have the notorious CTC175 - CTC187 series chassis, which went snowy all the time due to cracked solder joints on the shield grounds around the tuner and microprocessor. In either case, some good quality resoldering should cure your trouble. If you have never done fine solder work on PC boards with small surface-mount parts, allow a qualified tech to handle it for you.

The hdmi port is for high definition multimedia interface. You should be able to send standard video through the Vport to your set. (RCA phono jack and plug) Stargazer

That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing. In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's You'd need to take to a tv shop and have it checked out. Stargazer

Is a good thing you have an indication of power,it means some volts supplies are working ,your set might have a shorted output transistor and he is the responsible for lighting up the picture tube and energize a transformer that also provides voltage supplies,if the transistor is bad it has likely open the safety resistor that gives him the power to operate.If you are familiar with tv service you can check this part to start but if you are not too familar with tv service be safe and call for the assistance of a servicer.