I HAVE A PHILIPS MAGNAVOX 7P6035W102 60 INCH REAR PROJ TV THAT LOST ITS PICTURE SUDDENLY WHILE I WAS OUT OF THE ROOM..SO I DONT KNOW IF THERE WHERE ANY FIREWORKS OR LIGHT SHOWS BEFORE IT DIED,MY DOG WAS THE ONLY WITNESS AND HES NOT TALKING.I HAVE STUDIED ELECTRONICS IN THE PAST,I DO R+D INMY OWN ALT ENERGY COMPANY ON POWER INVERTERS AND ALT DRIVE SYSTEMS FOR VEHICLES.STARTED AN E-COURSE ON COMPUTER AND TV REPAIR ABOUT A MONTH AGO(NOT SOON ENUF I GUESS),THE POINT BEING,IM NOT GOING TO FRY MYSELF. SO WHER CAN I FIND THE CHASSIS # ON THIS THING AND A SERVICE MANUAL WOULD BE GREAT (#7566 IS WHAT PHILIPS SAYS BUT THEY DONTSELL THEM ANYMORE).I SEE THE EXPERIENCE YOU TECH GUYS(LIKE DAVE) HAVE AND IM BLOWN AWAY BY HOW EASY YOU MAKE THIS STUFF SEEM.SO HOW ABOUT SOME HELP WITH THIS BEAST PLEASE.I STILL HAVE AUDIO AND POWER LITE,THE COOLANT IS NASTY LOOKING AND THE BLUE LOOKS TO BE LOW,BUT I DONT SEE ANY PHYSICAL SIGNS OF DAMAGE FROM LEAKAGE.IT WAS VERY CRUDDY BEFORE I CLEANED IT UP BUT THAT SEEMS TO BE COMMON IN MY LIMITED EXPERIENCE. AND YES I KNOW ITS AN OLD SET (CIRCA'97)BUT IT WASNT PUT INTO SERVICE UNTIL LATE '99 ANDIT HAS LOW HOURS IF THAT MEANS ANYTHING.I WOULD APPRECIATE ANY HELP YOU BRAINIACS CAN THROW MY WAY AND WHEN I GET THIS FREE POWER THING FIGURED OUT I WILL BE GLAD TO RETURN THE FAVOR!! THANKS ,GEO
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I need to know the chassis # it will start with PTV -835 0r something like that before I can help you. also it will have two main boards inside. one is the large signal board on the right side, & a small signal board on the left side. LOOK REAL CLOSE at the large board toward back for dampness from coolant. I would bet that has caused the problem. it also needs the coolant changed. usually the blue, but I have had to change green also. good luck, Phillips Tech TOM
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First of all, thanx for the kind words. I think your set is a PTV 700 series- the chassis # should be on the back of the unit.
If there is no light coming from the tubes it is quite possible the flyback transformer has failed. One thing you can do is pull the rightside board out (large signal board) and find the HV out xstr near the flyback. Check it for short from emitter to collector. If shorted, it probably took out R934, .33 ohm resistor in the emitter leg to ground.
Also, on that set, there are callouts next to the pins on the connectors on the left side which are a great help when troubleshooting. That chassis can be pulled out pretty far so you can get to 'em. Grab your meter, and check for presence of 130 volts and the other supply voltages listed in the callouts.
If you manage to score a new flyback and get it working, we'll tackle the fluid change in another post!
Good luck,
Dave
PS: also look to see if you can see the filaments in the tubes glowing, and listen if you can hear the HV come up when you power the set.
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FIRST, I THANK YOU GUYS FOR YOUR QUICK AND KNOWLEDGABLE RESPONSES, BUT TO PUSH MY LUCK EVEN FURTHER,DO EITHER OF YOU GENTS KNOW WHERE I MIGHT FIND A REPRINT OF A SERVICE MANUAL????,JUST AS A SECURITY BLANKET.ITS JUST A HANG-UP OF MINE SINCE I WAS A KID WRENCHING ON $50 CARS......PUT THAT MANUAL IN MY HAND AND I'M A 10 FOOT TALL,BULLET-PROOF BRAINIAC,AT LEAST IN MY OWN LITTLE WORLD ,LOL !! THANX AGAIN , GEO P.S. IM GOING TO ATTEMPT TO APPLY YOU GUYS' EXPERTISE LATER TONITE I'LL LET YOU KNOW WHAT I FIND OUT......
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Agreed, it is always a plus to have the factory service literature. You can use the schematix along with the callouts on the boards. That chassis is a pretty easy one to service, actually.
Dave
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CHASSSIS#PTV775AH01 I SEE NO GLOW ,NO ARCS...NOTHING BUT WHEN I TURN IT ON I GET THE NORMAL CLICK AND THEN A SCREECH? CHERP NOISE I DONT KNOW IF ITS NORMAL OR NOT , I MAY BE HEARING IT BECAUSE I HAVE IT OPENED UP? ITS COMING FROM BOARD (PRETTY SURE) RIGHT SIDE FROM REAROF SET P.S. SORRY FOR THE DELAY GETTIG BACK TO YOU GUYS,BUT WHEN IT RAINS IT POURS IF YOU KNOW WHAT MEAN .BTW...ARE THERE ANY SCHEMATIC SITES THAT ARE BETTER THAN OTHERS I DONT MIND SPENDING SOME $$$$ BUT ID LIKE TO HAVE A USEFUL MANUAL,I WOULD ASK ABOUT PARTICULAR SITES BUT IM NOT SURE OF THE RULES ON THIS FORUM THANX AGAIN, GEO.
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Geo, do you have audio, and just no picture? or is the tv completely dead with no lights on front also? need to know that first, so I will know what area to start in with schematic. Phillips tech Tom
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YES I DO HAVE PERFECT SOUND AND THE GREEN LED LIGHTS UP.ALSO THE CHANNEL CHANGES BY REMOTE AND SET BUTTON,IF THAT MAKES ANY DIFF??? BTW..THE ONLY WAY I KNOW THE CHANNEL CHANGES IS BY THE SOUND..NO DISPLAY ON SCREEN AT ALL. IM TRYING TO PIN DOWN THE SOURCE OF THE CHIRP WHEN I TURN IT ON. IS THAT A NORMAL SOUND THAT IM NOTICING NOW BECAUSE I'M LISTENING AND I HAVE THE BACK COVER OFF?? THANX IN ADVANCE FOR ANY HELP, GEO
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Geo, do you have horiz. drive on pin#6 on the large sig. panel? if so do you have vert drive on p#7 on LSP? IF SO, THEN WHAT VDC DO YOU HAVE ON P#6 OF IC 7952 ? ( 0-15 VDC ) I THINK THE CHIRP IS A BAD H.O.T. AND MAYBYE NEEDS A FLYBACK ALSO, BUT CHECK WHAT I MENTIONED FIRST ,AND LET ME KNOW. GOOD LUCK, PHILLIP'S TECH TOM
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