No power
Ypu will first have to check the horizontal output transistor and make sure it is not shorted. The voltage for the horizontal output transistor comes from pin14 of the SMPS transformer. Then it goes through the coil,L815, then to the diode for B+,D825. Then the B+ goes through coil L816. Be sure after D825 you check the capacitor, C830, as this is a very common fault with this set. Then the B+ flows through L817, then through two One ohm resistors, R857 and R858 to pin8 on the flyback transformer. If you get B+ on pin 8 of the Fly, and none on the horizontal output transistor, the fly is open and is bad. I have a schematic that is very close to this set but not an exact one, but most of these sets are about the same, and if you know anything about Panasonic TV sets, you should be able to repair them with a schematic from another set. BTW, this Horizontal and fly circuit is on the D board. If you wish to have a copy of the service manual for a set close to yours, I will send you a copy. If you follow these instructions, you should be able to find the fault with this TV set. If the SMPS is not working, you will not get any voltage also on the HOT. Good Luck
Thanks for the reply I'll check it out tonight.Just an observation,you can tell me I am wrong,the smaller gauge wire from the flyback transformer seem to be too short to go to the front.Or that there is a wire come from the front that connect to the flyback? I'll see what I can find.Please see the attached picture for the two wires.Thanks.
Pete
I've eventually used a flash light shine into the cabinet and sure enough I saw the focus block in the front end. My hand is long enough to reach over there.Many thanks to Leadtech.
Thanks,Scott,for the offer.I've ordered the service manual few days ago.It'll come in next week. There are some voltages I like to look into. Thanks again.
Pete
×