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LG bh9530tw home theater no power
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Re: LG home theater no power
Did you try PM DJKRISH to see if he can upload the schematic?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: LG home theater no power
Originally posted by R_J View PostSo what exactly is wrong with YOUR power supply, maybe we can figure it out. Post a picture and list what parts you have found that are defective so far.
I will make pictures tonight and upload these here
My Player wont turn on. Nothing happen when pushing the power button on the remote control. No lights nothing
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Re: LG home theater no power
"Ye olde" crapped-out start-up cap problem, perhaps?Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
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Re: LG home theater no power
That is positively irrelevant, especially in those smaller can sizes. Just because they haven't exploded, doesn't mean they haven't dried out and/or dramatically lost capacitance.
https://en.wikipedia.org/wiki/Bootst...power_suppliesKhron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
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Re: LG home theater no power
Originally posted by Khron View PostThat is positively irrelevant, especially in those smaller can sizes. Just because they haven't exploded, doesn't mean they haven't dried out and/or dramatically lost capacitance.
https://en.wikipedia.org/wiki/Bootst...power_supplies
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Re: LG home theater no power
For starters, i'd replace C909, C919(?) and C936, preferably with name-brand, low-ESR ones.
And how far off are the voltages you're measuring?Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
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Re: LG home theater no power
... Which may well be an indication of the "hiccup"-mode the PWM chip is in, not being able to start and keep working.
So either (one of) those three capacitors i indicated has failed, or (maybe a bit less likely) there's some shorted diode on the associated secondary.Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
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Re: LG home theater no power
I can't really see the values from the photos you've posted.
No, i don't have the schematic, but for sort-of-"textbook" circuits like these, manufacturers rarely make things much more complicated than the datasheet examples of the chips they use. In this case, that 7-pin chip driving that transformer seems to be a Sanken STR-A6053M.
https://cdn.badcaps-static.com/pdfs/...ae6914545d.pdf
Example schematics are on page 12.
C909 is most likely the filter capacitor for the chip's Vcc line (C2 in the example-schematics), so that would be the prime suspect, given the symptoms. Something like a 47u/50v should be fine, in that position. C936 may well be a similar value, and the fatter one between them, possibly 100uF/50v (the voltage rating is visible).Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
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