Re: Bush LCD TV no power *HELP!*
Thanks again for help guys.
How I found it was to go into a dark room hold board over a bright light while examining it so you can nearly see through it.
beemerbruser
Member
Last Activity: 11-22-2012, 04:52 PM
Joined: 08-05-2012
Location: Clonmel
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Re: Bush LCD TV no power *HELP!*
Ok guys bit of an update. Examined the board again & found a small crack on one of the tracks in the primary side, so rubbed it down to expose copper & joined with a bit of solder. Plugged mains back in & it powered up!
So any recommendations for a broken track? A bit of solder joint enough or would a bit of resistor wire be better for the job?
Thanks again folks!Leave a comment:
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Re: Bush LCD TV no power *HELP!*
Can you read through my 1st post & see if I've done it right already or are you talking about something else? It's been 15 years since I was in collage doing this stuff
As Retiredcaps has said earlier, I should be getting more than 9V at VDD of IC101. If don't have this then there's hardly any point in trying to take measurements in the secondary.Leave a comment:
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Re: Bush LCD TV no power *HELP!*
I get nothing. That's my problem. Sorry, I should have clarified that at the start.Leave a comment:
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Re: Bush LCD TV no power *HELP!*
@retiredcaps - Attached is more cap pics, C103 & C113. Hopefully these are the ones you are referring to.
C103: 10uF 50V - Readings: 9.32uF, ESR: 0.50
C113: 33uF 50V - Readings: 36.66uF, ESR: 0.06
@tom66 - Attached pics as requested.
Anymore info needed let me know.
Cheers guys!...Leave a comment:
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Re: Bush LCD TV no power *HELP!*
Firstly, thanks guys for the rapid responses!
@retired caps - see attached pic of under heatshield. Looks like it says "RR 222K 1KV" printed on it . According to the ESR meter it's 0.26ohms. Does this sound ok or should I remove & test ooc or just replace regardless?
@tom66 no it's an LCD 1080p & yes I was surprised too by the quality of components used. If only it would work though! Line voltage is ok 223.8V
@selldoor 311.6V at the + & -...Leave a comment:
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Re: Bush LCD TV no power *HELP!*
Hi, thanks for quick post.
I was always under the impression that around 300V DC was normal on the big cap. Regardless I've replaced battery & now reading 308VDC. However, this has no bearing on actual fault so any ideas what next? Because I'm not seeing anything on the secondary diodes I assumed there is an issue somewhere on the primary side. The transformer details if this is helps are
MD-1301 (00)
MV-DP9569 DELTA
DCUM1002(02) 2D3
CheersLeave a comment:
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Bush LCD TV no power *HELP!*
Hi guys,
having trouble trying to figure out an issue with a Bush 24" LCD TV. The issue is it will not turn on at all. When plugged in there is no 12V output from the power board/Inverter. It's a Delta DPS-83AP. I'm familiar with electronics but a novice when it comes to debugging down to component level. Tools I have for testing are a Fluke 179, Atlas ESR60, soldering iron and cheapo analogue meter. Anyway, as well as measuring resistors and caps this what I've done so far:
On primary side.
Measured 230VAC coming to board
Measured 230VAC on the rectifier... -
Re: Technika 32-407B starting problems
Thanks for the response. Yes, mine is the same as pic so I'll replace the same caps & go over the solder joints too. I'll post up here on how I get on as there may be others out there in the same boat.Leave a comment:
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Re: Technika 32-407B starting problems
HI,
I was reading your post about the issue you eventually solved. I have the same TV exhibiting the same symptoms. Can I ask you a couple of question?
1. In your final post, did you check all connections to all the boards & solder all connections on all the boards too or just the PSU?
2. Can you try to direct me to the SMD cap that you reckon could have been at fault too?
3. Was your PSU PSA-218-417-R? If so, which caps did you end up replacing?
Thanks a mil,
SteveLeave a comment:
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