How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Pete Your Own Question

Pete
Pete, Electronic Engineer
Category: TV
Satisfied Customers: 9974
Experience:  12+ years experience installing and repairing electronics.
Type Your TV Question Here...
Pete is online now
A new question is answered every 9 seconds

Hello, I have a Samsung model sp43q5hl1x projector wont

Resolved Question:

Hello,
I have a Samsung model sp43q5hl1x projector wont come on I Checked power up to the ic regulator voltages are 160 , pin 3 of ic is up and down between 10 volts and17.9 unstable ,any help would be appreciated

Chris
Submitted: 1 year ago.
Category: TV
Expert:  Pete replied 1 year ago.
Hello Chris,
Welcome to JustAnswer!
I am Pete, and I'll be happy to assist with your question today.

It seems that the voltage regulator IC is malfunctioning since the output is fluctuating.
Check that there are no dry solder joints on the device.
If it appears to be soldered ok, it may be defective and will need to be replaced.
Customer: replied 1 year ago.
Hello Pete,
I want to be more clear on this, The circuit in question is a smps circuit the regulator pin 3 is the controlling voltage input from an optoisolator connected to a transistor who,s emitter feeds pin 3 the turn on and turn off voltages, the voltages are from 1.2 to 17.9 Now the circuit wont oscillate and the secondary side of the transformer wont produce any dc voltages mymyhttp://www.tube plus.me/player/497497/

Chris
Expert:  Pete replied 1 year ago.
Without a physical board to test or detailed schematics and datasheets it is impossible for me to work out how the circuit should perform.
Your voltage fluctuation symptoms will most likely be due to a defective regulator and it will have to be replaced.
Customer: replied 1 year ago.
Ok Pete,

You might be right! When power is turned on in the circuit I get a noisy whining fromr the transformer which means a component has failed before or after the transformer and it just might be the regulator

Chris
Expert:  Pete replied 1 year ago.
Good deductions and analysis, Chris...
replace the regulator and let me know if the replacement device emits a more stable voltage.
Pete, Electronic Engineer
Category: TV
Satisfied Customers: 9974
Experience: 12+ years experience installing and repairing electronics.
Pete and 5 other TV Specialists are ready to help you
Customer: replied 1 year ago.
Ok Pete will let you know by weekend

Thanks

Chris
Customer: replied 1 year ago.
Hello Pete
The reason for the tv not staying on after being powered up was due to a shorted flyback transformer ,this caused the smps transformer to have a high whinning pitch and not the ic regulator that was suggested to be the culprit earlier.

This case is now closed, and how do you rate me ?

Chris

Expert:  Pete replied 1 year ago.
Hi Chris,
I would rate that as an excellent job well done!
Best,
Pete.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I'm screaming your praises!! WOW! I plugged my TV in and bammo! The picture came on bright and beautiful. What a relief! YOU saved me some money and headache. VM United States
< Last | Next >
  • I'm screaming your praises!! WOW! I plugged my TV in and bammo! The picture came on bright and beautiful. What a relief! YOU saved me some money and headache. VM United States
  • I love this site! $9 instead of a repairman or new/used frig can't be beaten. This older woman will worry less now that she knows about this site. Bless you all. Windy USA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • TV Tech1

    Technician

    Satisfied Customers:

    4800
    30 Years experience. Authorized Warranty servicer.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TV/TVTech1/2013-3-25_625_TECH1Nobanner.64x64.jpg TV Tech1's Avatar

    TV Tech1

    Technician

    Satisfied Customers:

    4800
    30 Years experience. Authorized Warranty servicer.
  • http://ww2.justanswer.com/uploads/OR/OriginalSeadog/2011-7-22_191917_ProfilePicture.64x64.jpg Rod's Avatar

    Rod

    TV & Communications Sys Repair

    Satisfied Customers:

    2354
    FCC Commercial License, Previous owner of Electronics Repair shop, 40+ years in electronic systems.
  • http://ww2.justanswer.com/uploads/benimur/2009-03-29_003401_id_2.jpg Louie's Avatar

    Louie

    Technician

    Satisfied Customers:

    2208
    25+ yrs. experience in the field and 3+ yrs. online, down to component level.
  • http://ww2.justanswer.com/uploads/P0/p0llinate/2011-4-27_174649_tucker.64x64.JPG Nathan's Avatar

    Nathan

    Installer

    Satisfied Customers:

    1683
    Custom home theater installer, authorized dealer top brands.
  • http://ww2.justanswer.com/uploads/ST/steven.benoit/2011-4-1_194735_untitled1.64x64.jpg Steven's Avatar

    Steven

    Technician

    Satisfied Customers:

    1366
    Ma. Master Technician Lic. Authorized Warranty Support.
  • http://ww2.justanswer.com/uploads/IT/ITPeter/2011-5-3_23187_Pete.64x64.JPG Pete's Avatar

    Pete

    Electronic Engineer

    Satisfied Customers:

    1260
    12+ years experience installing and repairing electronics.
  • http://ww2.justanswer.com/uploads/3G/3guk/2011-1-15_132320_D1SC01363.64x64.jpg James's Avatar

    James

    Technician

    Satisfied Customers:

    1154
    AV Service Engineer (4 Years)