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RCA F27TF12 No chassis #    
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_Al
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PostPosted: Tue May 12, 2009 4:01 pm    Post subject: RCA F27TF12 No chassis # Reply with quote

This RCA has a ( I think) sharp chassis in it. I have no manual. Screen turns yellow with red dashes on it.
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_Eric
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PostPosted: Tue May 12, 2009 4:01 pm    Post subject: Reply with quote

That is the chassis (F27T12). That chassis is know for CRT problems, but I
did find this:

Missing Blue On Crt. Measure The Voltages For Each Drive Coming Into The
Crt Board. Should Be About 2.6v, Missing Drive Will Be Lower Voltage.

Found Leaky D413 (For Blue) On Main Board Beside The Jungle Ic. 6.2v 1/2
Watt Zener.
_Eric
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PostPosted: Tue May 12, 2009 4:02 pm    Post subject: Reply with quote

More:
Picture Tube Is Bad Tube # B68luw6962 Manufactured By Sharp. I Have
Replaced 4 Of These To Date In Warranty. One Unit Would Flash & Flicker Then It
Would Flash. After That Green Dashes Would Apear On The Screen. This Was
Due To A Micro Procesor Lock Up When The Tube Arced Internaly. Tube Can
Be Rejuvinated. The Pin Out Is 5=G1 6=Kgreen 7=G2 8=Kred 9=Heater 10=Heater
11=Kblue

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Pix missing green.

R875 8.2k 1/4w Resistor On Crt Board.

----------------------------------------------------------

I have that manual on ESI. If you need it let me know.
_Al
Guest





PostPosted: Tue May 12, 2009 4:02 pm    Post subject: Reply with quote

Yes I need it. Found that cooling the jungle IC brought the picture back.
Want to make sure.
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