20 Most Recent Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television - Page 9 Questions & Answers

Replace both convergence ICs nuber STK392-040 that should take care of the problem. you can get new replacement ICs at the following link and they will send free instalation instructions with pictures so you can install the new ICs. heres the link.

Samsung... | Answered on Oct 08, 2008

i have one on my workbench right now please check the jumpers you unplugged especially the one on the far left corner (goes to front panel) the one behind the stk 392 010 you replaced (very easy to miss)
take good lighting and make sure every jumper is plugged in
skip this if your set was working but if it wasnt check the fuses and fusible resistors
third if all that fails check your soldering make sure the joints(on the stk's ) are all good and shiny and the joints on the heavier components especially the line output transformer the big black plastic thing on the right of the stk ic you could have loosened it [UNPLUG THE POWER CORD FIRST]

Samsung... | Answered on Oct 04, 2008

I had the same problem with mine until I figured out it was from the auto self focus. Normally it should be done with a picture that remains constant or close to it, or else the focus gets screwed up. Go to menu and setup, then turn the self focus off. If you look on the remote and slide the lower portion down you will see a self focus button. My suggestion is to put a DVD in and hit the pause button and then press the self focus button and wait until its finished.

Samsung... | Answered on Oct 04, 2008

if the blue lines runs across the screen in the center its a vertical deflection problem it will need to be diagnosed.

Samsung... | Answered on Oct 02, 2008

It sounds like there is a fault on the chroma panel of some kind.

Samsung... | Answered on Oct 01, 2008

Without sticking my neck out too far I think a component failed on yor tv initially and took out some over voltage protection in the process and what you are seeing and smelling is the result of whatever is being cooked alive. It does not mean there was a manufacturing fault with the tv as this has happened on other appliances as varied as can be. Please call out a competant technician and if you can help it dont switch it on again to avoid further damage to the unit and also to expose yourselves to the risk of fire or electric shock. Hope this was of some help.

Samsung... | Answered on Oct 01, 2008

It sounds like the popping noise you heard was a capacitor blowing its top somewhere in the tv. Sorry I cannot be more specific but if you manage to find out where this cap has gone also check any resistors near it as they can be also damaged. If you cant do this call out a competant technician. Good luck.

Samsung... | Answered on Sep 30, 2008

I think it could be a faulty diode on the power supply board. If you can check this for yourself otherwise call out a competant technician. Good luck.

Samsung... | Answered on Sep 30, 2008

I think you have a fault on the chroma board and on the picture frame board. If you can trace it yourself try these two locations otherwise call out a competant technician. hope this helps.

Samsung... | Answered on Sep 30, 2008

check the 3.9om fusible resistors next to the stk the small ones with the orange white gold stripes
they are paired so you will have to replace at least 2 maybe more.all the current from the stk goes thru

Samsung... | Answered on Sep 30, 2008

picture is ok /converg.-ok/;diagonal lines on screen; looks like waves.Appear on tv and video modes.I observed same problem on some another tv in my practic,but this case is worse.

Samsung... | Answered on Sep 29, 2008

Hi there,

Thanks for your posting in FixYa.

I think the IC placed in it is not compatible. So you need to go for a repair shop to diagnose it thoroughly.

Dont forget to vote me. Have a Nice day.


Samsung... | Answered on Sep 24, 2008

glad i could help ...now the black screen .. remove the back turn it on and look at the actual tubes
the base of the tubes should have a reddish glow if not the set isnt fully on look at the top of the tube if its on you should see a box or a dot etc
if both conditions above are true then you have damaged the stks you will need to replace them again
you can order from here $7.99 each http://www.electronix.com
remember to solder carefully stks do not take shorts well
if you dont see anything in the tubes you may have damaged the regulator too if you have a multimeter handy (and you know how to use it)while the set is running check (pins 15,18) for +28 volts {pins 16 ,17 and 19} for -28 volts if you dont get around those voltages you will be replacing the regulator too its probably an str (something or other) look around where the power cord plugs in for a big transistor looking thing..
good luck

Samsung... | Answered on Sep 23, 2008

IT sounds like you may have two small issues that may be interrelated the movement thing is definately
due to a dry joint(tech term for a bad solder joint) somewhere if you are comfortable with removing the main circuit boards turn them over and look at the tracks on the bottom with a powerful light look out for solder joints that are dull or have a ring in them you can rework the joint with a soldering iron and some flux core solder
the temparature part is odd to me 99% of the time its the other way around due to condensation but i will give it a shot it sounds like something is making a good connection when warm and expanded but when it cools and contracts it breaks it so look carefully around the large metal heatsinks start with the 4 power transistors near the lpt (dont forget the power regulator ic)check that the components attached to it are seated well and the joints are good.

there is a more risky way but it saves alot of time i used this sometimes in the field ....you take a can of compressed air turn it upside down so that it sprays out liquid air(away from hands and faces)..turn onthe set while the back is open wait for it to warm up 20 min or so then carefully spray the chilled air
on one component at a time untill the set tuns off
remember go slow one component at a time be careful

Samsung... | Answered on Sep 23, 2008

replace the two convergence ICs with STK392-040 ICs. You can get replacement ICs at the following link with free installation Instructions. Heres the link.

Samsung... | Answered on Sep 21, 2008

if its on for that long its probably not a main capacitor issue a blown capacitor of that size would
have some distortion in its shape look for bulging at the top or bottom or fluid leaks at the base
a good capacitor looks like a small tin can
from the sound of it your problem is elsewhere if the picture is the picture is good then it may be a regulator or power transistor if the picture is distorted then its in your convergence circuit.

Samsung... | Answered on Sep 20, 2008

We had a repairman tell us that it was the projector light and meter that it would cost over $500 to fix. He reset a timer and said it would give us another 2 wks before the light would go out. Does this sound right to anyone?

Samsung... | Answered on Sep 20, 2008

the first two things to check is to make sure none of the IC pins arent bridged with solder, and the other is to determine all wires are connected correctly and firmly.

Samsung... | Answered on Sep 18, 2008

With TV powered off press: [mute], [1], [8], [2], [power]
Television will power up in service mode and GAMMA GAIN1 will be displayed on the screen.
Use [mute] and the [menu] button to move values up and down.
Use the [volume +] and [volume -] keys to move to other adjustements.
Use [add] to save the settings.
If you're attempting to adjust color or geometry errors, you'll need the Video Essentials DVD, Laser Disc or some other source of test material.

Samsung... | Answered on Sep 17, 2008

I decided to scrap the samsung and buy a new 42" LG Scarlet LCD - by far a better use of my money

Samsung... | Answered on Sep 15, 2008

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