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 Jack Your Own Question
Jack, Technician
Category: TV
Satisfied Customers: 7877
Experience:  40 years experience as audio,video repair and installation tech
Type Your TV Question Here...
Jack is online now
A new question is answered every 9 seconds

philips 42pfl5432d/37 turns on and stays on as long as nothing

This answer was rated:

philips 42pfl5432d/37 turns on and stays on as long as nothing is on that input. as soon as you change to a active input i.e xbox on and running tv powers off. if you remove (xbox from input tv stays on fine. same with coax and hdmi inputs. power or main board issue?
Hello , my name is Jack
Perhaps I can help you with this problem but first i would have a few questions;

When it turns off with a unit connected and turned on , can you turn the tv back on ?
If so , does it stay on for a while or just shut down right away ?
Did this problem appear all of sudden or slowly got worse ?
Customer: replied 3 years ago.

it appeared all of a sudden. with a unit connected I can power it back on for about 1 sec then it shuts down again

O.k and another question;
When it shuts down , does the power light flash at the front ?
Customer: replied 3 years ago.

no when it shuts off no noises no blinking light. if you didnt know any better you would think someone hit the power button on the remote. then you can turn it back on and count to 8 then it shuts off and just goes back to solid red light on front of tv


O.k , one thing to try if you haven`t done it yet , disconnect everything or set the tv to an input where nothing is connected and open the menu then go through the different items in the menu to see if it will turn off then.
Customer: replied 3 years ago.

already done that. if nothing is connected to a input the tv stays on. can navigate menus and change aspect ratio. I have the back of the tv off. no bad caps on the power board.

O.k then , at first I was tempted to say the power board as pretty much all the problems I`ve seen with this model came from the power board , namely bad caps.

Still could be the power board that fails when it is asked to deliver more current i.e when the tv is processing signal.

Can you see the plugs that go to the backlight inverters ?
There should be two connectors side by side labeled CN905 and CN 903 , set the tv on a live input and disconnect those plugs to see if you will get the sound and if the tv will stay on ?
Note that you won`t get the picture

Customer: replied 3 years ago.

ok removed the back light plugs. powered on tv. turned on xbox heard sound. it stayed on for 15 seconds. then i heard a quick popping sound from the speakers as the tv shut off. light went red. didnt blink

o.k , can you give me a couple of minutes?
Customer: replied 3 years ago.



On the main board there is the LVDS connector CN850 , it is a 40 pins connector .
Replug the backlights on the power board and unplug that CN850 on the main then try the tv again with a signal.

Customer: replied 3 years ago.

Hi Jack. So with removing the cn850 the unit is staying on but not displaying any picture at all i reconnected the backlights as instructed. i can hear sound from the unit


O.k but the tv will stay on without shutting down ?

Reconnect that lvds plug without turning off the tv or unplugging the power cord ?
Customer: replied 3 years ago.

as soon as i plugged in the cn850 unit shut off instantly

O.k then this looks like a main board problem , namely the sub-power that feeds the t-con board connected at the other end of that lvds cable.

There is a 14 volts coming from the power board that goes into the main board where it is sud-divided into 12 ,5 and 3.3 volts , by connecting the t-con (with a signal) it pushed it over what it can supply and it just shuts down those voltages.

In a repair shop there would be other test that could be tried to confirm that but it requires some specialized equipment.

So to resume, from what you tried and without being there with tools and meters , I would put my money on the main board.

Right now there is something confusing here , the service manual gives me one part number for the main and the aprt list I have gives me 2 versions.
Can you give me the numbers on the bar coded sticker of the main board ?
Customer: replied 3 years ago.

cbpf72mkpi and lower half of barcode p4m574370217


engraved in top corner of board is dlh 715t2303-3

Sorry it took a while but that board part number CBPF72MKPI A.K.A 996510008583 was difficult to find as all the regular suppliers seem to be out of stock, I found one that seems to have it at the link below;


You can also use the part numbers I gave you if you`d like to do your own shopping.

Give it a try and you can reach me here at any time after this chat is closed if you have questions about this.
Thanks and please take the time to rate my answer

Jack, Technician
Category: TV
Satisfied Customers: 7877
Experience: 40 years experience as audio,video repair and installation tech
Jack and 3 other TV Specialists are ready to help you

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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
< Previous | 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:

  • Louie



    Satisfied Customers:

    25+ yrs. experience in the field and 5+ yrs. online, down to component level.
< Last | Next >
  • Louie's Avatar



    Satisfied Customers:

    25+ yrs. experience in the field and 5+ yrs. online, down to component level.
  • Rod's Avatar


    TV & Communications Sys Repair

    Satisfied Customers:

    FCC Commercial License, Previous owner of Electronics Repair shop, 40+ years in electronic systems.
  • Pete's Avatar


    Electronic Engineer

    Satisfied Customers:

    Over 16 years of experience installing and repairing electronics.
  • Steven's Avatar



    Satisfied Customers:

    Ma. Master Technician Lic. Authorized Warranty Support.
  • euro-pro llc's Avatar

    euro-pro llc


    Satisfied Customers:

    20 years in TV repair,certified by all major brands- Sony,Samsung, LG,Toshiba, Panasonic, RCA,
  • Daniel's Avatar


    Electrical Engineer

    Satisfied Customers:

    BSEE (Electrical Engineer), 10+ years electronic design experience ,chip, board, component expert
  • Conrad's Avatar



    Satisfied Customers:

    Training on many types of consumer electronics, training on Sony Samsung and JVC