56" RCA rear projection (FLYBACK related problem)

haitham · electronics forum beginner Joined: 15 Jan 2007 Posts: 3

Hello!

I just replaced the FLYBACK transformer on my 56' RCA rear projection TV model P52921 (Flyback part # 239111, Chassis CTC195M). The HOT was not replaced and I believe the new FLYBACK is not an original part. Anyhow, after replacement the TV powered up and initially the picture looked fine. However, everytime the unit is powered up there is a noise coming from the back that lasted for 3-4 seconds then it disappears. The TV worked well with the exception of the noise and a slight blurr at the very right edge of the screen. The TV worked in that manner for about 7 days until today it did not power up as it did before replacing the FLYBACK.

Without any testing and with those two clues (the noise and picture blurr) can someone help me understand what might the problem be?

It could be anyone of these: The new FLYBACK, the HOT blew, Driver and HOT base circuit components, the LV regulator, or maybe bad soldering to the new FLYBACK.

Any good ideas?

Thanks!

haitham · electronics forum beginner Joined: 15 Jan 2007 Posts: 3

I was able to narrow down the problem, just need a couple of information. I need to know both the location numbers and part numbers for those two HOTs (the horizontal output transistor and trnasformer). If you can provide me with this information I will be very thankful!

haitham · electronics forum beginner Joined: 15 Jan 2007 Posts: 3

Hello, Anybody lives here? Smile

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