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arch42358
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 Posted: Sat Jan 12, 2008 4:57 am Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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B+ NOMINAL VOLTAGE= 150V. STARTS DRIFTING WHEN POWER IS TURNED UP..COMING DOWN TO 106V..
your suggestion is appreciated highly.
THANK YOU
Archie |
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pawluf
Joined: 10 Jan 2008
Posts: 18
Location: Malta G.C.
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| Posted: Sun Jan 13, 2008 7:28 pm Post subject: |
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Is the TV generating any EHT? Is the sound ok?
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Pawluf
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arch42358
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| Posted: Mon Jan 14, 2008 12:56 pm Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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| pawluf wrote: | | Is the TV generating any EHT? Is the sound ok? |
B+ NOMINAL VOLTAGE= 150V. STARTS DRIFTING WHEN POWER IS TURNED UP..COMING DOWN TO 106V.
HEATER IS NOT ON.
SCREEN IS BLACK, NO RASTER..
PLS NOTE:
WHEN OPERATING THE TV REMOTE CONTROL..HEATER LIGHTS UP MOMENTARY THEN GOES OFF AGAIN..
HV SPARK COMES ON MOMENTARYILY WHEN TV REMOTE OPERATED CHANNEL IS PRESSED UP DOWN
Thanks for ur reply |
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pawluf
Joined: 10 Jan 2008
Posts: 18
Location: Malta G.C.
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| Posted: Mon Jan 14, 2008 2:36 pm Post subject: |
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If all other voltages are ok, especially the 26V on IC301, V-defl. (check it for any dry joints). I would go to D410 & D411 on pins 3 & 4 of the flyback transformer.
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Pawluf
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arch42358
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| Posted: Wed Jan 16, 2008 12:31 am Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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Hi pawluf
i'll try to chk those points mentioned ...
let you knw...
cheers! |
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arch42358
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| Posted: Thu Jan 17, 2008 10:58 am Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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I CHECKED THE DIODE D410 & D411 COMPONENTS AND THE 26V ON PIN 8 IC 301. IMMEDIATELY AFTER PLUGGING, THE VOLTAGE REACHED 20 VOLTS AND AFTER 1-2 SECONDS, THE VOLTAGE ON PIN 8 DROPS TO ONLY .6V.
THE SAME CONDITION STILL EXISTS; N.B-"WHEN YOU HEAR THE HV GETTING ACTIVATED, THATS THE TIME THE VOLTAGE DROPS. "
CHECKED FOR COLD SOLDER CONNECTIONS AS WELL. |
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arch42358
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| Posted: Fri Jan 18, 2008 12:38 am Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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The 12v supply and B+ are affected, it comes to 3V (12V) and 106V for the B+(120V). The time it starts to come down is after the sound of the degaussing coil getting energize, together with the RL801, so you can imagine its that quick!
At first I thought its the sound of the EHT...
thanks for your time! i appreciate very much.
regards
archie |
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pawluf
Joined: 10 Jan 2008
Posts: 18
Location: Malta G.C.
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| Posted: Sat Jan 19, 2008 4:52 pm Post subject: |
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Sorry but I've been away for a couple of days. Check for any over heating on heatsinks and specially power resistors. If not check/replace c820 - 220uf/160V and c829 - 100uF/160V. If these also proove to be ok my bet will be C810 - 470uf/16V on the primary circuit. While you're at it you might want to change C811 & C812 as well.
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Pawluf
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arch42358
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| Posted: Fri Jan 25, 2008 12:45 am Post subject: GOLDSTAR-CF-25C60PS B+ DRIFTING |
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thanks pawluf.
I'll replace those components and let you know.
regards
archie |
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