Where can I buy an STR-4525 transistor for my Toshiba Rear Projection tv?

If you have some garbage in the main processor you need to leave it unplug for 40 MIN, to reset it back to normal. If that don't work then you need to check for a shorted horizontal transistor, mounted on a metal heat sink near the fly back transformer, that is what turns your high voltage on.. If that is good , then the next common problem would be is a bad convergence module, and you are looking at around 400 on repairs.

high voltage is not coming up. possible fuse locates on power supply board on the right if you are sitting behind set with back off. if fuses are good, possible horizontal output transistor shorted. sounds horrible but easy repair

This TV could have one of several problems including but not limited to; convergence IC's,bad capacitors, shorted horizontal output transistor. Call a good TV Tech. Check with the BBB before you decide on one.

Shorted horz. output transistor

replaced the blue crt drive pcb or the large transistor on the crt driver pcb.

the start up or standby power is in need of troubleshooting. I would start by checking the regulator and horizontal output transistors.

MY HUSBAND FIXED IT FOR 7.OO BY REPLACING THE POWER REGULATOR - STR M6811A....SK9705
TV REPAIR WANTED 300.OO - CRAZY

dont know about warranties but horizontal lines means your horizontal frequency which runs about everything has drifted off sync and if too high or low it will activate shut down circuits in high voltage and power suppy, even causing HOT transistor to short. good luck and call a tech.

No need to take the front screen out. The power deflection board is messing up with that red light.
Nic

This set is pretty common for the regulator IC to go bad. Its inside on the power supply Printed circuit boad assy. It will start with STR#### and have 4 digits after the STR####, depending on the model of the set. Good Luck