Question about Philips Magnavox 51MP392H Rear Projection Television

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No hv.. no. hv and no voltage supply on the lamb drive and there is one parts sparking looks like thermistor on the circuit board part of the lamb drive. what is the required voltage of the lamb drive...?

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What's a 'lamb drive'? Do you have a schematic for this model? If so, let me know where you got it as I'm looking for one. What's the number near the part that is arching on the PCB? 

Posted on Sep 30, 2008

  • hanzee_2000 Oct 04, 2008

    'Heliman' posted a link to the service manual:
    http://www.mediafire.com/?ad1mtycjei3

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Turned on tv no picture only sound then i heard a pop and smelled burning tv turned itself off. 5 min tried turning on tv again nothing happened tv does not turn on at this time


Your RCA TV needs serious troubleshooting. Burning smell is from HV transformer or resistors smoking.

Most likely power supply and/or high voltage circuit or convergence circuit. Many times RCA have multiple or secondary faults that occur with HV or convergence failure.

Repair of RCA HV or convergence usually requires exact manufacturer parts and upgrades or repair in power supply. I would not advise trying this repair without manufacturer support for correct part numbers and service bulletins.

easyab

Feb 28, 2010 | RCA Projection Televisions

Tip

Projection TV troubleshooting techniques.


When you turn your television on and get nothing almost anything could be wrong with it. The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem. Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

First for safety unplug the unit. If your set has no blinking lights proceed by checking the main fuse in the power supply for continuity and replace if open. Then proceed to looking at the mainboard for burned resistors or bulging electrolytic capacitors. Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct. If they are bulging replace them. Also replace any bad resistors found. At this point it would be a good idea to inspect all solder joints on all boards, but especially the Low Voltage and High Voltage sections, and resolder anything which looks suspicious.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure. Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating.

hardrocko

on Oct 13, 2010 | Projection Televisions

Tip

Basic Standard TV Troubleshooting Techniques.


When you turn your television on and get nothing but a clicking sound you could have almost anything wrong with it.

The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem.

Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

If your set has no blinking lights proceed by unplugging and looking at the mainboard for burned resistors or bulging electrolytic capacitors.

Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct.

If they are bulging replace them. Also replace any bad resistors found. Resistors must be replaced with similar units and cannot be derated.

Resolder any bad connections on the low voltage power supply and certainly the high voltage power supply. That would be most or all of them.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure.

Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. If you are not sure about the results replace it. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating. Please consider a testimonial.

hardrocko

on Mar 27, 2010 | Projection Televisions

1 Answer

TV turned off and would not turn back on


Hello Scbesso:
I am asumming you are talking about the Deflection Board, which some call the High Voltage Board, Power Supply Board etc... These boards are know to fail, but can be repaired to componet level. Check all fuses on the Power Supply board and make sure none of them are blown. Most older projection televisions use around 115vdc to 130vdc to power the deflection circuit, Considering the shop could of repaired the board at componet level but charge more for the entire board, Two known common failures in the Defletion Circuits are the Horizontal Output transistor or the Flyback tranformer. The flyback is the most likely suspect. It is the largest part on the Power Board ususlly grey or black with three to four red leads coming out of it going to tubes and Focus block and or HV Splitter. The Horizontal Transistor in located very near the Flyback Transformer it is usually by itself on a metal heatsink , its black with 3 leads connection to the board. Number on it might say something like 2SD OR 2SC followed by for numbers You need to determine if you are getting any HV at all by listening closely to the set for a Static sound much like when you run your hand in front of Direct View Crt television,when u turn it on. If it comes on temporaily and then shuts down then you problem lies in the Main PS section,and you are in HV protection shutdown mode. Hopes this helps you..

Sep 21, 2009 | Samsung HC-R4755W 47" HDTV

1 Answer

Jumping Screen 61" cinemavision


Hello dana1983165,

The problem you described is caused by poor voltage regulation in the High Voltage power supply. This can be caused by a defective fylback transformer, a defective focus block, a defective HV trippler, of the horizontal output transistor/damper diode assembly. I would first check the high voltage from the flyback to see if it was fluctuating, you can do this with a high voltage probe. The I would check the horzontal output transistor out of circuit with a transistor checker to see if it passes.

If you do not have equipment what you can do is remove the deflection/HV board and order a replacement from panasonic.
Look up Panasonic's web site and contact their technical support number and call them to find out the part number and have them order the part for you. If this fails try PTS at http://www.ptscorp.com

I hope this helps

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 22, 2009 | Panasonic PT-47WX53 47" Rear Projection...

2 Answers

Picture quality


I don't know your model of set very well. I will comment in general. I am assuming your set is using three CRT's for its projection system.

This is normaly a voltage regulation fault. As the CRT's pulls more current, the HV is dropping. A lower anode voltage means lower cathold current. What this does is lower the mass of the electron beam that is hitting the front phosphor in the tubes. Because of the lower electron mass, the deflection yoke has an easier time to pull or deflect the beam for scanning. And, thus the picture appears to increase in size.

If you look at low cost CRT TV sets, it is very common that the raster changes size a little with contrast and brightness change. This is because they use less quality of HV regulation.

Check the main power supply to see if it is stable with wide variation of picture contrast. Also, if you have an HV probe, check to see if the HV at the anodes of the CRT's is stable with changes in the picture contrast and brightness.

If the main power supply is stable, and the anode voltages are changing, then I would try the HV multiplier and flyback assembly.

This can also get a little complicated to troubleshoot. There is some regulation feedback reference from the HV drive that goes back to the HV generator circuit. There may be a fault in this area as well. Where this gets interesting to troubleshoot is where the horizontal scan drive is also the HV drive, as like most common CRT sets.

Some sets use scan compensation to also help for stability. They will control the gain of the scan amplifiers to help stabilize the scanning to make up the error difference in the HV regulation.

Jerry G.


Nov 07, 2007 | Panasonic PT-51G44 51" Rear Projection...

1 Answer

Light blinking...but not coming on


This looks like a problem with the H Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor, and the components in that section of the TV.

In addition check the voltage test points on the HV / Horizontal and switching power supply board. This will determine if the section is working or not (most likely not). Make sure you have a schematic, and multimeter and a high voltage probe.
I hope this helps,
Thank you,
Shuttle83

Sep 04, 2007 | Sony KP-46WT500 46" Rear Projection...

1 Answer

Sony Big Screen TV Not Powering On


This looks like a problem with the High Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor, and the components in that section of the TV.

In addition check the voltage test points on the HV / Horizontal and switching power supply board. This will determine if the section is working or not (most likely not). Make sure you have a schematic, and multimeter and a high voltage probe.
I hope this helps,
Thank you,
Shuttle83

Aug 15, 2007 | Sony KP-46WT500 46" Rear Projection...

2 Answers

Dead no pic no sound


This looks like a problem with the H Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor or a driver transistor, and the components in that section of the TV.

In addition check the voltage test points on the HV / Horizontal and switching power supply board. This will determine if the section is working or not (most likely not). Make sure you have a schematic, and multimeter and a high voltage probe.   Since you have checked most of the common Items I am leaning towards one of the fuses in the system, I would suggest getting a schematic since switching power supplies can be tricky. Trust me I remember the days when a tech could find a fuse on a board easily, those days are gone some fuses even look like ICs now they are called digital fusible devices.   try www.servicemanuals.net to get a schematic for your set
I hope this helps,
Thank you,
Shuttle83

Feb 11, 2007 | Sony KP-46WT500 46" Rear Projection...

1 Answer

Momentary high voltage


Is the voltage staying at 135 volts or is it rising?? There are several power supply fix it kits available as well as a way to test the power supplys. please let me know as I have a nice library of sony kits to use as well as a way to test the power supplys. Also a bad Crt can cause a shutting on and off of a projection set as well. If this is the case, try having the CRT rejuvenated and see what happens. please do not forget tp rate this htread.

Oct 16, 2006 | Sony KP-46WT510 46" Rear Projection HDTV

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