My power supply the 18v and 24v drop to 0 then back every 5 seconds. Green wire gets 2.7v and drops to 2.6 in same cycling. Blue wire 1.7 cycles to 0. Any help would be appreciated. Thanks
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Re: FSP271-4f01 power cycles
You could haveOriginally posted by irad View Post
1) bad startup cap
2) bad SMPS IC
3) shorted output diode
4) some board shorted dragging down the power supply--- begin sig file ---
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Re: FSP271-4f01 power cycles
Thanks for the reply. I will check the items you listed and report back. I have an esr meter to check caps. The tv is an Olevia lt42hvi. I took off the main board (logic) and the power board stopped cycling. But the backlights did not go on even though 24v was going to the inverters. I guess the main board send a signal to the inverters to go on? Can I force the inverters on to see if current draw is causing a power board problem? Are there any schmatics for a lt42hvi?Comment
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Re: FSP271-4f01 power cycles
Thanks for the reply. I will check the items you listed and report back. I have an esr meter to check caps. The tv is an Olevia lt42hvi. I took off the main board (logic) and the power board stopped cycling. But the backlights did not go on even though 24v was going to the inverters. I guess the main board send a signal to the inverters to go on? Can I force the inverters on to see if current draw is causing a power board problem? Are there any schematics for a lt42hvi?Comment
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Re: FSP271-4f01 power cycles
Yes.Originally posted by irad View Post
PlainBill talks about using a resistor to pull PS_ON highCan I force the inverters on to see if current draw is causing a power board problem?
https://www.badcaps.net/forum/showpo...1&postcount=45--- begin sig file ---
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Please do not post inline and offsite as they slow down the loading of pages.
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