Question about Philips 32PF7321 32 in. HDTV-Ready LCD Television

8 Answers

Main Board for a 32" LCD

Shaotim's, The power light turns green for a sec. then flashes red. Do you think the main board needs replacing?

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  • snelson_ga Dec 12, 2008

    I had it checked....the gy said it need the main board replaced. He wanted $410 to fix. I thought I'd try to fix it. If I can't, I'll trash it. Thanks

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8 Answers

Louie Role
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  • Master
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Hi and welcome to FixYa,

With the indulgence of shaotim.

Initially, the blinking red light is significant. It indicates the unit is in protection mode. The number/sequence of the blinks would point to the probable fault and where diagnosis would start.

Common problem on this model/series would be 5 blinks that points to the SSB-Small Signal Board. The current replacement has a 12NC of 313926809052 (Philips Part Numbering System).

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 15, 2008

  • Louie Role
    Louie Role Dec 15, 2008

    You can try checking parts availability here.

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ABHISHEK.C
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Hi
These all sound classic to power supply faults. Or, there may be a board that is pulling too much current due to something that has failed, and the power supply is in the protect mode. 

Posted on Dec 15, 2008

  • ABHISHEK.C
    ABHISHEK.C Dec 15, 2008

    OR The lamp could still be the issue even though it looks ok. The other possibilities are the lamp ballast (power supply for the lamp) and/or the thermal fuse. In either case I would have a technician look at it so you don't replace parts you don't need.

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Ginko
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  • Philips Master
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If the model is a Philips 32" LCD , the replacement is here.

If you cannot find your replacement in the list, contact them at Phone:
(952) 881-6492
(877) 881-6492

Posted on Dec 15, 2008

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One of the boards is bad, need to see whats inside...

Posted on Dec 12, 2008

  • 1 more comment 
  • Justin Washburn Dec 12, 2008

    you said you got another board right?

  • Justin Washburn Dec 12, 2008

    I just got your request, had another person I was helping fix a dough roller for a pizza place. Resend it and Ill help you.

  • Justin Washburn Dec 12, 2008

    LCD dont have flybacks

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Benjamin Patri
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It only flashes once. Is there anything that may suggest what happened to cause it to start doing this? You lost both audio and video correct? It could be a number of things and if you here any sounds that would also help diagnose the correct problem which also could be the power supply or the protection circuitry

Posted on Dec 12, 2008

Lee Hodgson
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  • Philips Master
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Press the on/off button on the top right hand side of the remote, it may be on standby, also check the batteries in the remote

post back please

Posted on Dec 12, 2008

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  • Master
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Did you try the newest firmware

http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?sct=LCD_LARGE_30_40_SU&cat=FLAT_TV_CA&grp=TV_GR&scy=US&ctn=32PF7320A/37&slg=AEN&mid=Link_Software&hlt=Link_Software


or try unplugging the TV for 30 seconds to 1 minute to "dissipate possible static electricity in the small signal board

Posted on Dec 12, 2008

Edward Bowers
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This sounds like the flyback unit on the main board needs replaced!that should fix ya!

Posted on Dec 12, 2008

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1 Answer

I have a magnavox 32mf338 tv,the red light is on,when u hit the power button the green light flashes but will not turn on what would cause this
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Mar 15, 2016 | Magnavox 32MF338B 32 in. LCD HDTV

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Why did it work before installation, now flashes numerous different colors?
Before installing replacement parts???

I can assume that the t-con board or the video board had terminal connectors or ribbon connectors. What is often overlooked is a misaligned connector or worse, a broken or bent pin. Try examining these connection points. You may have to use a magnifying glass. A defective screen usually goes black or produces broken images and/or color points.
I hope this helps.

May 30, 2015 | Protron PLTV-4250 42 in. LCD Television

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My LG 42LH30 gets red power light but wont turn green?
Fault with main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Oct 11, 2014 | LG 42LH30 42 in. LCD TV

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Red light on main board
It should turn green.

Jun 17, 2013 | Sharp LC-52D64U 52 in. LCD HDTV

1 Answer

Red light blinks when tv is turned on., and tv flashes Sony and then nothing-blank screen. Red stilkl keeps flashing.
Good day!!!


That problem is usually have 2 causes..Its either power supply board or mainboard..

Please take this steps on how to determine the problem:
  1. Open the back cover.
  2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..
  3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..
  4. If the power supply output is normal..The problem could be on the main board...
  5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..
  6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..
Hope thissolution will be helpful..

Thanks for using fixya...

Aug 11, 2011 | Sony KDL-32EX400 32 in. HD-Ready LCD TV

1 Answer

Push power button green light flashes several times then goes solid red for about 3 seconds but tv does not come on we unplugged for 30 mins did not help
My friend always left their LCD on and the TV did the same thing the main board inside needed to be replaced call service provider.

Jan 27, 2011 | Emerson LC320EM9 32 in. LCD HDTV

1 Answer

I HAVE AN EMERSON LC320EM9 32" LCD FLAT SCREEN TELEVISION... IT WENT OUT IN A THUNDERSTORM WHERE THE HOUSE GOT HIT BY LIGHTNING... IT WAS COMPLETELY DEAD WHEN I GOT IT... I FIRST REPLACED THE POWER BOARD...
The Tuner board is also dead.Also known as a main processing board.That the board,where the incomming broscasting signal cable plug into it.The Tuner board CPU is fried,not taking in voltage distribution any more.The noises u hearing is from those transforners in the power supply board voltage,have no where to go,but it own looping on the power supply board.Tries websites like Shopjimmy.com,Ebay.com to buy a refufurbish Tuner board for the replacement.

Sep 11, 2010 | Emerson LC320EM9 32 in. LCD HDTV

2 Answers

Lg 32lcd tv's - does not power up - flashing green light
Replace any swolen capacitors on power board. If still not working replaced main board.

Aug 29, 2009 | LG 32LG40 32 in. LCD HDTV

1 Answer

When I turn my tv on I only have a flashing red and green light. The power to the tv does not come on.
Most failures when the TV does not power ON, are related to the power supply and some cases to the main board. If you intend to fix the TV yourself is easy by swapping boards or if you are able to isolate the failure to one particular board(power suppy) even better. If you're DIY, open the tv and check the power from the power supply to the main board using a voltmeter. You should be getting 5, 12 and 24 volts going to the main board.
If you need further assistance. let me know or write to jah2mil@hotmail.com

Jul 24, 2009 | Dynex 32 in. LCD Flat-Panel HDTV

2 Answers

Same problem. red light flashes 3 times, but will not turn on.
Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

mrwindex

Jul 03, 2009 | Toshiba 42HL196 42 in. LCD HDTV

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Main Board for a 32" LCD a repair man told me the main board need to be replaced......$410. I thought I'd try to fix myself. How much is a main board? I'm not even sure which board is the 'main' is it the board that the main power cord plugs in to?

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