Question about Samsung HCN436W 43" Rear Projection Television

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Dropped picture Hi Adoph, I hope you can help. I have the above mentioned TV and the red of my picture has dropped. It just happened yesterday when I switched it on in the morning. It was fine when I switched it off the night before. I have taken a couple of pics so hopefully you can see. Is it fatal? Is there something I can do to fix it or will it need to go in for repair? Will it be expensive to put right? Thank you for any help you can give. Best wishes Richard

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Help pls. i have the same problem....

I live in scandinavia DENMARK and its difficult to ship the chips .... what shall i do ?

Posted on Jun 06, 2008

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Hi bully, the problem is the convergence ic diodes, 3 way convergence chip called an stk392-140. you need to purchase x2 they are easy to soilder in, a novice could do it. you can purchase from (little diode uk) all the best.

Posted on Apr 20, 2008

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My KP-51HW40 clicks off after running for a period. The red power light blinks when it goes off but screen stays dark. When TV is shut off for a while it restarts and runs fine. The "On"...

KP-51HW40 shuts off due to incorrect white balance and blue arch lines is an evidence of that incorrect white balance. I hope tv standby red light would flashing 5 times then 3 seconds pause and again 5 times when tv shuts down.
This is rear projection tv that has three picture tubes (red-green-blue) inside to generate picture that projected at front screen. These three picture tubes must be drive with correct drive voltage to produce good picture of each color.
Solution for your tv problem is Screen Voltage adjustment that can be done easily if you are handy with electronics stuff repair.
Let me know your expertise level to guide you more and if you feel unconformable by tv repair then local tv repairman will help you to adjust white balance in tv.
Hope these info will help you.
Let me know if you have additional questions.

Nov 05, 2010 | Sony KP-51HW40 51" Rear Projection...

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Picture will have red tint most of the time. Sometimes works great then turns red. Sometimes starts red then goes back to normal. Sometimes picture is almost completely red and images are blurred. What...


One thing you can try is turning off the TV and then unplug it for 30 seconds or so. Then plug it back in, turn it on, and see if the problem has cleared up. If you're lucky, the problem may be solved this simply.

I know this might sound odd, but you could also try unplugging your Cable/Satellite from the TV for a while and watch some DVD Movies or something like that. I've heard of this fixing issues like the one you are having. I'm not sure why it works, but I've seen many situations where it does fix the problem.

If the above doesn't work, it is possible a wedge that centers the yoke around the picture tube has deteriorated and fallen out. That would effect the color purity. You could check to see if this is the problem by removing the rear cover of the TV set and looking for a wedge that could have fallen. It should be laying in there somewhere if this is the case. Also, it never hurts to do a thorough inspection while you have the rear cover removed to see if you notice anything else out of the ordinary.


This could also be due to problem in the red cathode section in your TV.

The following could be checked as they are possible reasons for this problem:
  • Voltage on red video ckt.
  • Loose or print cut in red ckt.
  • CRT base loose.
  • Problem in red signal processing line.
  • Signal processor is defective
  • Connector loose somewhere.
If you are not able to figure it out yourself or don' t feel comfortable doing anything I have mentioned above, you may have to take the TV in to get it serviced.

I hope this helps! If it does, please be sure to leave me a good rating and some feedback. I would greatly appreciate it!

Best Regards,


Jun 02, 2010 | Sony Grand WEGA KDF-42WE655 42" Rear...

2 Answers

My screen keeps losing the red colour

not absolutly sure but it sounds like one of the crt's are starting to fail. Sony has a white balance circuit that constantly will attempt to correct for white balance errors, if it has a hard time fixing the white balalnce what you describe can happen. Durring these events your tv's power button can blink in repeating pattern of 5 blinks indicating an akb or auto white balance error. Eventually the picture may flicker on and off or the tv will shut down all togeter with a 5 blink error. But i cannot be sure without looking at it myself. There are other causes aswell; focus block, or a crt driver can cause simular issues. But given the age of this set i feel it is a better chance one of the crt;s are going bad. But again it could be the other things i mentioned.

May 07, 2010 | Sony KP-43HT20 43" Rear Projection...

1 Answer

2002 akai 54in. rear projection tv wont turn on

Unplug,replug the tv back an hour later.The tv should reset itself.More problems repost,see if i can help u.

Feb 20, 2010 | Akai PT5492S 54" Rear Projection...

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Red light flashing no picture or sound

Please check Lamp in TV that seems broken and causing red light bliknking on TV front, if it is Sony KDF-60XS955
If model is different, please mention it so to provide you proper helpful info.
Let me know if you need further info.

Nov 23, 2009 | Sony Grand WEGA KDF-60XS955 60" Rear...

1 Answer

No picture

if it is dropped you most likely would have a cracked ciruit board. you would need a qualified tv repairman to check tv

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Panasonic TC-25V50A TV circuit schematic needed to try and fault find. Set completely dead except for red led signifying power on. Power fuse OK. No blown out capacitors or resistors apparent. Can you...

Success! After finding nothing with a visual check I dropped the set about 3inches and all is well. Must be a mechanical connection problem. Probably a dry joint, will resolder if it happens again. John

Nov 29, 2008 | Televison & Video

2 Answers

RCA TV Will Not Power On - Powered Off Suddenly

Theses sets had 2 problems pip mod or most of the time Flyback Transfomer bad.

Jul 13, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

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Red Shadow on scheen

your tv needs to be align take it to a tech so that the tv can get a convergence adjustment it is call color bleeding.these things when a set gets old this wil cost between 440.00 TO $75.00,in this the comb filter and the screen voltage will be checked.

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