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#1 |
Badcaps Veteran
Join Date: Dec 2013
City & State: Tathra, New South Wales
My Country: Australia
Line Voltage: 230VAC 50Hz
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![]() After sitting in Standby mode for years(?) the owner decided to power up and play a CD. At which point the magic smoke emerged and it died.
Upon opening I can immediately see the main charge capacitor has dropped its guts (literally). The switching IC is completely physically destroyed so I can't read any type number. I should be able to work my way through the other components; I can usually get a SMPS going. (I can see at least one bulging electro; they'll all get replaced.) But I'm hoping someone might be able to suggest the most likely six-legged IC that would be used? If it helps at all, board number is EAX39561401 Oh, by the way, I'm pleased to see all these components sacrificed themselves in order to save the life of the 10c fuse, which is perfectly fine! |
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#2 |
Badcaps Veteran
Join Date: Mar 2012
City & State: Nuneaton Warwickshire
My Country: uk
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![]() Could it be a str w6251 is there a ebr number on the board
https://elektrotanya.com/lg_ebr42894...wnload.html#dl |
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#3 | |
Badcaps Veteran
Join Date: Dec 2013
City & State: Tathra, New South Wales
My Country: Australia
Line Voltage: 230VAC 50Hz
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![]() Quote:
And what makes you conclude that the switching IC could be a STR-W6251? Thanks for your help! - David |
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#4 |
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![]() IC101 is a STR-W6251 according to the schematic
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#5 |
Badcaps Veteran
Join Date: Dec 2013
City & State: Tathra, New South Wales
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#6 |
Badcaps Veteran
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![]() The one I have is for a RCT689H, Page 46 smps schematic, Page 61 board layout
Last edited by R_J; 11-14-2021 at 05:29 PM.. |
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#7 |
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Join Date: Jan 2016
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![]() lg_ebr42894130_sch
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#8 |
Badcaps Veteran
Join Date: Dec 2013
City & State: Tathra, New South Wales
My Country: Australia
Line Voltage: 230VAC 50Hz
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![]() Thank you so much I'm sure it's probably identical. I'll check my spare parts box; I strip down TVs that are unrepairable and I have many of these 6-legged SMPS ICs. Hopefully I have STRW6251?
Are you aware of any common substitute if I strike problems? (Out of interest I've been checking what else needs replacing. The 2.7 ohms power resistor seems to have gone O/C. My DC measurements of the zener diodes suggests they might be blown. But at least the fuse was saved!) |
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#9 |
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![]() Check, replace.
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#10 |
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![]() I would also replace C108 (33µf/35v) on the vcc of the ic.
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#11 |
Badcaps Veteran
Join Date: Dec 2013
City & State: Tathra, New South Wales
My Country: Australia
Line Voltage: 230VAC 50Hz
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Posts: 398
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![]() All working again. Got the STR-W6251 out of China. Virtually all the components on the hot side needed to be replaced. Both zener diodes were defunct. Just to be sure I changed out all the electro caps on the cold side.
Another piece of electronic saved from landfill! |
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