Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Samsung problems i have replaced the ic boths and tried turnig on my t.v. the screen shows for a second and then shrinks from all sides and then shuts down. i have found a bad fusable resistior (i know spelling) 3.9 hmz 1/2 watt would this be causing it or should i be looking for something else?

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  • ugly fod
    ugly fod Jan 07, 2009

    thanks it is working now!!!!!!!!!

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If the fusible resistor is open, yes it could cause this problem. Check for others in the area as well. Is that resistor 3.9 Ohms?
I'm guesing yes. This is likely the current limiting resistor for the IC. There should be another for the other IC as well. Look for pico fuses in that area that may be open.

Dan

Posted on Jun 20, 2008

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Picture shrinking on samsung 32" 450 series???


The shrinking can be due to low voltage output from the SMPS unit .Also there is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

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1 Answer

Vertical picture comes on then shrinks up at center of screen, both top and bottom, after a minute or so. Sometimes will lock in and work till I shut it back off. What does it need & is it worth...


You need to resolder Power supply board and convergence ICs these sets are well known for Poor Solder connections resolder vertical IC also.
Solder all pinns on the FBT flyback Transfomer.

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3 Answers

Pictures shrinks.. Panasonic TC-20LM Television


Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.

Oct 10, 2009 | Panasonic Televison & Video

2 Answers

I having white spots poping up all over my screen


check out for the convergence ic on the convergence board that ic must be faulty and it needs replacements.there are two such stk ic that both needs to be replaced as replacing 1 ic will not solve the problem.

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1 Answer

After a few minutes picture shrinks to single line on screen and then powers off


Since the set works initially, there are likely poor solder connections at the vertical IC. If this is not addressed soon, the IC will fail and need to be replaced. The vertical IC is a small flat IC with about 11 pins or so that may be marked LA7837 or something similar. Try resoldering the pins first. If that fails to resolve the problem, replace teh IC. Feel free to post the marking here so I can verify you have the correct one.

Dan

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2 Answers

Monitor only stays on for 3 seconds


There is probably a bad capacitor within the monitor that will not allow the picture to "hold" in the on configuration. This will need to be replaced. You can send it back to Phillips, or 17" monitors are pretty cheap these days. I would suggest a Samsung or BenQ. They both carry 3yr warranties.

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1 Answer

Screen shrinking


You have bad solder connections on the vertical output IC or on one or more of the surrounding components. Good Luck

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1 Answer

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it is due to problem in red cideo section. solution 1 supply to red video output& output itself 2 crt base loose 3 connector loose 4 red video sigal line from chroma ic to red cathode of crt. 2 red

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1 Answer

Convergence & Pincushion Problem


I had a similiar problem. My screen would shrink in then expand. After a few months of doing this it just broke altogether. No sound or video.  Its not fixed.
You can get a repair kit from this site.
http:///www.magnavoxhelp.com

Aug 31, 2006 | Philips Magnavox 9P6034C 60" Rear...

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