Question about Philips Magnavox 51MP392H Rear Projection Television

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No heater voltage

Philips 51mp6100/ dptv 585 hv &audio ok no crt heater voltage and no road map

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  • lastchancetv May 22, 2009

    I have good high voltage/ sound/tuner ---only thing missing is the crt's heater voltage, figure I got a 1 ohmer off the flyback somewhere feeding the usual 6vdc to the heaters. no map and I'm lazy the chassis is a pain to work on,was hopen someone new the id # to the resistor or pico fuse. if I don't hear from ya untill later have a good and safe holiday week-end

    warren

  • lastchancetv May 23, 2009

    hey crickett, thanks a bunch for getting back so soon. But I got to looken around and I had the manual on cd. after philips went down the tubes, and started charging so much for their update manual program I drop them. but I had this one ,and everything before 2006. so If I could help ya with manuals just holler, been in the biz for 23 years now. anyway the problem was an open resistor #3801

    .68 ohm. thanks again

    warren

    last chance tv

    last chance tv @sbcglobal.net

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  • Philips Master
  • 1,779 Answers

Without HV you won't get heater voltage, describe the problem your having.

Posted on May 22, 2009

  • Jim Krause May 23, 2009

    Hi Warren,

    Send me your E-mail address and I'll send you the manual.

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1 Answer

Screen not appear,no Oscillation & no F.B.T on


check the boost voltage.may be there is a short in -160v.
-prabakaran-

Jul 12, 2010 | Philips 105S51 15" CRT Monitor

Tip

How to test Flyback Transformer Without taking it off the Boarda) Basically it...





How to test Flyback Transformer Without taking it off the Board


a) Basically it has to be acted upon by a supply voltage of at least 95V

to work.



sample picture:


7_31_2012_2_32_48_pm.jpg

b) Of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor



sample of H out transistor

7_31_2012_2_38_05_pm.jpg


It would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the CRT.


c) The easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too ( if speaker is connected).






7_31_2012_2_42_22_pm.jpg


• Heater : marked with letter H and H1

• Green Arrow for the G2 voltage


d) Having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.





7_31_2012_2_47_50_pm.jpg





• These only applies to CRT type TV's.

on Jul 31, 2012 | Philips Televison & Video

1 Answer

Philips DPTV 60PP9753/17. Problem started when blue CRT seemed to "fuzz" out. Tried to increase the brightness via the Blue G2. Made no difference. The sound quit while the picture was running. Turned...


Hi my name is Roety,
I can help you with your issue ,
First of all lower the blue and any other screen controls or service menu settings back to where they were or lower.
Then see if it powers on again with a picture.
If it still shuts off, unplug the Blue CRT circuit board and see if it works.
If it does work the blue CRT may be shorted .
Your problem may have been corroded CRT pins. 
 
 
If I have helped you with your issue please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap
Thanks

Nov 02, 2009 | Televison & Video

1 Answer

No raster, no audio, CRT filaments lit, 20KV high voltage, B+ 136V.


most likely you are missing one of the scan derived power sources; most of these sets when HV is present produce some secondary voltages for other things---look at diodes and resistors around the flyback (HV) transformer--if you find an open resistor there--follow it back to the diode that supplies it---also try to check all the smaller voltages from the main power supply

Aug 07, 2009 | Disney DT1900-P 19" TV

2 Answers

SOUND OK BUT NO PICTURE.


THAT MAKES SENSE, CHECK FOR HIGH VOLTAGE- YOU CAN SIMPLY HOLD A NY SMALL NEON BULB[LIKE THOSE USED IN PILOT AMPS] NEAR THE ANODE LEAD OR FLYBACK TRANSFORMER IF IT'S ACCESSABLE, AND IT SHOULD GLOW. THE NEXT STEP IS TO CHECK THE FILAMENT CIRCUIT FOR THE PROJECTION TUBES- OFTEN IN MODERN SETS, THE FILAMENT [HEATER]VOLTAGE IS OBTAINED WITH A COUPLE WINDINGS AROUND THHE FLYBACK. IF YOU HAVE HIGH VOLTAGEE, AND NO FILAMENT, A 'HACK' THAT WORKS IS TO USE A SMALL POWER TRANSFORMER [MOST FILAMENTS [HEATERS] ARE 6.3 VOLTS, BUT DOUBLE CHECK THAT- IF YOU HAPPEN TO HAVE ONE OF THE LESS COMMON LOW VOLTAGE HEATERS, AND YOU OVER-VOLTAGE IT, YOU'VE JUST DESTROYED A VERY EXPENSIVE TUBE.THE 2SD921 IS IN AL LIKEYHOOD THE HORIZONTAL OUTPUT, WHICH DRIVES THE HIGH VOLTAGE CIRCUIT. IF YOU HAVE A SCOPE, CHECK FOR APPROX 15KHZ SIGNAL AT THE EMMITTER OR BASE- BUT BE CAREFUL ABOUT THE GROUND LEAD- USE A 3 PRONG ADAPTER, AND DEFEAT THE EARTH GROUND OF THE SCOPE, OR YOU COULD DAMAGE THE TV'S POWER SUPPLY

Feb 28, 2009 | Samsung LN-T5781F TV

1 Answer

DPTV335


Ed did you change the yokes when you put the DPTV series CRT into the PTV chassis? If not its most likely the vertical output or the Horizontal output that got destroyed. If you changed the yoke its most likely the HV generator.
On the DPTV chassis that should shutdown the vertical deflection which would leave audio working worse case scenario would also be the HV generator and Horizontal output.

Oct 20, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

Philips DPTV335


Ed,
That chassis has a couple of problems I'd check first before writting it off as a bad crt... The vertical Ic can cause the problems you're experiencing. In that unit it's a TDA8177 (vertical Ic) and if it fails you'll find no 10v supply to the HV generator - thus no HV to light the cans. Could also be the HV generator module itself, but more likely vertical Ic before suspecting the HV module. If you hav a dmm you could measure the voltage on pins 7 & 8 or pins 1 & 2 on the HV plug. If you have nothing there it's the generator - if not highly suspect the vertical.
To answer your question - if the blue can were bad red & green would still light depending on the internal short. If all three are out I'd suspect a loss of HV (high voltage) or B+ as it's referenced.
Good Luck!
Bill

Oct 13, 2008 | Philips Magnavox MWR10D6 DVD Recorder

1 Answer

Have sound no pic


Hello tshotwell,

I would start by checking the IHVT for High Voltage output this can be done with a HV probe. Then if no HV is present I would check to see if the filament voltage for the CRTs is working, after that I would check the CRTs using a CRT tester (checking for shorts). These are a few of the beginning test that could be done. You will need a schematic of the TV, a High voltage probe, a CRT tester (can be purchased from ebay) and a multimeter. If you do not have experience in electronics, I would suggest having a TV repair person check the TV out for you.

Sep 07, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Power issues


Audio is linked to the HV side on most CRT chassis.(That means No HV present)... Could be Flyback transformer, H.O.T., Horizontal driver.. Too many things without seeing..

Jan 19, 2008 | Philips Magnavox 27MS343S 27" TV

1 Answer

I have projection TV 55PP9363H/17 SOUND NO PICTURE.


check the horizontal output transistor, it could be open.

Jun 19, 2007 | Philips 60PP9352 60" Rear Projection...

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