20 Most Recent Samsung HCL4715W 47" Rear Projection Television - Page 3 Questions & Answers

Sounds like a convergence failure. Here is my tutorial, let me know if you have other questions

http://www.fixya.com/support/r5001731-convergence_diagnosing_convergence
Let me know if I can be of further assistance.

Probably a connection got loose on the convergence (they crack as it gets very hot) or a bad chip

http://www.fixya.com/support/r5001731-convergence_diagnosing_convergence
Let me know if I can be of further assistance.

possible bad digital pcb

this model number do not use lamp ?????????

immediately check your plyback connectors and wirings.there is a leak in your high voltage and this is dangerous so be carefull..to locate the leak,open the back cover of your tv enough to see the inside components...specially the plyback transformer..power on the tv and look for the arking of the high voltage.it is like a lightning strong light that produces the buzzing sound..once you see the source of the leak..power of the the tv.use a silicon adhesives (silicon gel) a silicon that is use by the glass intallers to bond the mirrors use on the display show room..apply the silicon on the leak area .apply a large amount of it to be sure there is no leak...once it is bonded you can power the tv right away...to check whether the leak is cured...


good luck hope this helps you..

please rate my help tnx.

Hello,

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem and the only use in feeding the TV fuses will be to keep the fuse manufacturer in business!

Sometimes, a fuse will just die of old age or be zapped by a power surge that caused no damage to the rest of the TV. However, it must be an EXACT replacement. Else, there could be safety issues (e.g., fire hazard or equipment damage from too large a current rating) or you could be chasing a non-existent problem.

If the fuse really blows absolutely instantly with no indication that the circuits are functioning (no high pitched horizontal deflection whine (if your dog hides under the couch whenever the TV is turned on, deflection is probably working).) then this points to a short somewhere quite near the AC power input. The most common places would be:

Degauss Posistor - very likely.
Horizontal output transistor.
Power supply regulator if there is one.
Power supply chopper (switchmode) transistor if there is one.
Diode(s) in main bridge
Main filter capacitor(s).

You should be able to eliminate these one by one.

Unplug the degauss coil as this will show up as a low resistance.

First, measure across the input to the main power rectifiers - it should not be that low. A reading of only a few ohms may mean a shorted rectifier or two or a shorted Posistor.

Test the rectifiers individually or remove and retest the resistance.

Some sets use a Posistor for degauss control. This is a little cubical (about 1/2" x 3/4" x 1") component with 3 legs. It includes a line operated heater disk (which often shorts out) and a PTC thermister to control current to the degauss coil. Remove the posistor and try power. If the monitor now works, obtain a replacement but in the meantime you just won't have the automatic degauss.

If these test good, use an ohmmeter with the set unplugged to measure the horizontal output transistor. Even better to remove it and measure it.

C-E should be high in at least one direction.
B-E may be high or around 50 ohms but should not be near 0.

If any readings are under 5 ohms, the transistor is bad. The parts sources listed at the end of this document will have suitable replacements.

If the HOT tests bad, try powering the set first with your light bulb and if it just flashes once when the capacitor is charging, then put a fuse in and try it. The fuse should not blow with the transistor removed.

Of course, not much else will work either.

If it tests good, power the set without the transistor and see what happens. If the fuse does not blow, then with the good transistor (assuming it is not failing under load), it would mean that there is some problem with the driving circuits possibly or with the feedback from the voltages derived from the horizontal not regulating properly.

Look inside the TV and see if you can locate any other large power transistors in metal (TO3) cans or plastic (TOP3) cases. There may be a separate transistor that does the low voltage regulation or a separate regulator IC. Some TVs have a switchmode power supply that runs off a different transistor than the HOT. There is a chance that one of these may be bad. If it is a simple transistor, the same ohmmeter check should be performed.

If none of this proves fruitful, it may be time to try to locate a schematic.

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.
GOOD LUCK...

Yes,this tv can be fix it have convergence problems.The convergence board the 2 STK covergence ICS are defective and some or all it resistors are dead.The shop will cost u $300-350 for parts and labors.

Projection TV sets have two very common problems listed below.

Problem #1) Convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Hi,thats could from your convergence color ic call stk
;you may need to replaced before looking for the tube thats may just an ajustement on tube screen control beware for high voltage
that is depend how old is the tv and the number of hour it play a day....
hope that will help

bad ic,s in convergence board ...need be replaced,

The clicking is caused by bad capacitors on the mainboard. It is a known problem that is pretty easy to fix. I have never soldered before and I was able to fix it for about 6 bucks! If you take off the back cover (about 18 screws) the mainboard is right in the middle and in the top right corner are 4 capacitors. They are in a row from top on down. Check to see if any of them are bulged on top and if they are they are bad. All you have to do is go to radio shack and get 10u35 volt capacitors and solder them in to replace the bulged ones. The ones that came with the set are under powered and these will fix the problem. Most people are quoted about $500 or more to fix this when a little work on our own works wonders!! If anyone wants more info I am on facebook! Brian Miller in Wisconsin!

The most likely cause is shorted convergence chips and possibly a few pico fuses.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix here http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

if youre already aware of what is the problem or the board that you need you need to take out the board and search for a P/N (part number) and then you can google it or you can go to this store website which i also use sometimes for reference because they have detailed pictures of the boards www.discount-merchant.com.
good luck.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony,Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit wiith instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms

• Screen Looks 3-D
• Colors wont align
• Screen may look distorted or warped
• No Audio/Video - makes a chirping sound.

Problem #2

Another common problem is dull or washed out video.
Your TV may have one or more of the following symptoms....

• Dull looking picture
• White looking picture
• Halos around objects
• Red/Orange looking picture

You can see some more examples and find a fix here
http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

BE SURE THAT THE TIMER HAS NOT BEEN SET FOR AUTO ON/AUTO OFF... THIS IS COMMON AND MANY PEOPLE DO ARE NOT AWARE THAT THEY HAVE TURNED THIS FEATURE ON OR THEIR KIDS HAVE DONE IT.

You need to clean the fans in the back and move it away from a wall so it can have room to "breathe" otherwise it will over heat and cause the screen to burn. Wich it sounds like already happend.

Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

• Screen Looks 3-D
• Colors wont align
• Screen may look distorted
• No Audio/Video - makes a chirping sound.

Example Photo:

Problem #2 CRT Fluid has clouded over.

Symptoms

• Dull Video, Washed out
• White/Bright looking video
• Halos around objects
• Red/Orange looking

Example Photo:


You can see more examples and find a fix here...

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Hi


Thanks for using FixYa. If you have already checked the cables at the back and everything seems fine then from what you have described it seems that you have to replace the convergence IC and also check the power resistor, if values are not exact you have to replace them. These ICs are located behind the black heat sink; you can see once you open the back off the TV. The convergence board should be checked for cracked solder joints and please make sure to check the resistors as if they are shot the ICs might blow again. All this is only recommended if you have electrical expertise and know how to solder/re-solder components, if not then you should get this done by a professional. The typical cost to get this fixed by a pro is around $250-$300. Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

we have no sound

P54A47W1