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Old 01-11-2019, 05:09 PM   #9
R_J
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Join Date: Jun 2012
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Default Re: Bush idlcd26tv22hd 17PW15-8 issue

So IC802 is a L6562 and not a IRF7314 as on the schematic? Pin 1 will likely be low as the voltage comes from +400v but since the pfc booster is not working, that voltage would only be around 340v
If those C805 & C870,C808 are small electrolytics, they could be bad.
Q803 is driven by ic802 at 70khz, so yes it does switch the primary of TR806 to ground BUT at 70khz, that action boosts the 340 volts to 400 volts on the other side of D824, Thats why the voltage on C819 is important to check as it wil tell you if the pfc is working or not

Last edited by R_J; 01-11-2019 at 05:24 PM..
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