20 Most Recent Sony KV-36XBR450 36" TV - Page 3 Questions & Answers


Here is a possible repair for your problem. Remember that this is not deffinet.
This does sound like a difficult problem, it might be better to let a repair shop handel it.


Poor contrast and picture disappears in Vivid and Pro screen modes.
Problem was resolved by replacing C210. The capacitor was breaking down under
operation. Important note: capacitors C257 and C248 are in parallel with C210 and similar
failure of any
one of these three capacitors could cause an identical symptom.
C210 P/N 112776011

Sony KV-36XBR450... | Answered on Nov 15, 2008


Here is the info on your problem. These are problems that have been found in the field.


Found cold solder on IC201 on the A Board.
IC201 P/N
875210025 CRT Driver

Found IC9001 on the C Board defective.
IC9001 875936083 TDA6111Q/N4 Video Output

White balance failure 5 times 5:0 or 5:1 • Video OUT (IC9001-IC9003) is faulty. • No raster is generated.
(not balanced) (C Board) • CRT cathode current detection
• CRT drive (IC201) is faulty. (A Board) reference pulse output is small.
• G2 is improperly adjusted. (see Note 2)

Sony KV-36XBR450... | Answered on Nov 15, 2008


You are not going to like what I am telling you.

The problem you are seeing is that the emission of the CRT has decreased to a point where there is not enough beam current, and the drive circuits are shutting down the beam bias to the electron-gun. The emission is at the borderline stage where it is on the edge and that is why it turns on and off. Most likely, as the cathode in the electron-gun warms up enough to reach a high enough emission, the bias circuits will switch on. Then when the emission drops just slightly because of the beam loading, there is a fault detected, and the bias circuits are switched off.

When you see the picture, the lack of sharpness (soft picture) is because there is too low a beam current for the electron beam to become narrow enough to be sharp at its focal point. There are circuits in the high voltage section to control focus, but they cannot go beyond what the beam cannot deliver.

The solution would be to change the CRT. This would not be feasible, and the CRT is no longer available. It will also be expensive to pay the labor to have the CRT changed. It would require a tech with the skills to perform the factory level purity set-up, convergence, pin-amp, scanning, and color temperature set-ups.

The labour alone could cost a minimum of a few hundred dollars. If I remember correctly, when the CRT was available for your model, it was costing over one thousand dollars. There are some strip magnets and rubber spacers that will also have to be replaced. Sometimes there may be some other small parts required. This will add to some extra cost.

In your case if the set is 6 years old, there is no gaurantee of how long it will take before there are other types of failures. Personaly I would not fix this set!

I would suggest to get yourself an LCD or Plasma HDTV to replace your set. Stay with a known brand name, and take the extended warranty. For myself, I would buy only a brand name that the company also manufactures broadcast and industrial TV equipment. This way, you know you will have original design, and high quality assembly in the set. You will get what you pay for.

In a very basic context, if you are going to watch in a dimly lighted room the Plasma is a good choice. If you are going to watch in a room that is lighted most of the time the LCD would be a better choice. Both systems are good. It depends on your preference and they way you will use the set.


Jerry G.

Sony KV-36XBR450... | Answered on Jul 18, 2008


Try a "hard restart". which simply means unplugging the power cord of the TV, and replugging it after 4 hours have passed. This technique reprograms the electronics, to a certain extent.
You can also visit the manufacturer's website or call their tollfree number for problem solving info.
Hope these suggestions help you out.

Sony KV-36XBR450... | Answered on Jul 11, 2008


You will not be able to service this at home. Most of the time there are failures in the scan amplifiers and or the power supply that cause the fault you are describing.

Jerry G.

Sony KV-36XBR450... | Answered on Jul 06, 2008


Try a "hard restart". which simply means unplugging the power cord of the TV, and replugging it after 4 hours have passed. This technique reprograms the electronics, to a certain extent.
You can also visit the manufacturer's website or call their tollfree number for problem solving info.
Hope these suggestions help you out.

Sony KV-36XBR450... | Answered on Jul 02, 2008


This can be a scan amplifier failure, failure in the high side of the main power supply, the picture tube may no longer be having emission, or the heater supply to the picture tube may not be working. There are many parts inside the set that can cause failures.

You will have to take the set in for proper shop service by an experienced TV tech.

Jerry G.

Sony KV-36XBR450... | Answered on Jun 28, 2008


The most common cause for this are electrolytic capacitors in the pinn amp and scan amplifiers going out of spec with age and use. It is more rare, but it is still possible have other support components go defective in these areas. This fault is refered to as pin amp distortion.

I have repaired many of this type of problem over the years.

If you decide to troubleshoot this yourself, take care about the high voltages employed in the TV set.


Jerry G.

Sony KV-36XBR450... | Answered on Apr 25, 2008


The most common cause is, shadowmask inside of the CRT is magnetized. It sounds by your description that the TV's internal degausser for the CRT is not working. This is serviceable by a service tech.

Most of the time the cause of a failed degausser is the thermoresistor. This is a common type of failure.

Another cause that can show the fault you are seeing is if the shadowmask in the CRT is defective. Sometimes the mask is damaged when the set is being moved, and is accidently banged against something. The CRT is sensitive to this type of treatement.

If the mask inside of the CRT is defvective, the only fix is a new CRT.

Jerry G.

.

Sony KV-36XBR450... | Answered on Apr 25, 2008


Only on newer TV's, yours (I dont think)has the adjustment, if it does it would be in the menu area.

Sony KV-36XBR450... | Answered on Apr 23, 2008


Most probably,the secondary power output of your TV's switching power supply is not functioning.You have to trouble shoot the secondary power which also leads to HT supply in the Horizontal circuitry.

Sony KV-36XBR450... | Answered on Apr 02, 2008


I have a 42" LG LCD TV and just experienced this today. Watching cable, then the screen went to black, but audio continued. I pressed the guide button on my remote and pic came on with my guide menu. But then went to black again 10sec later and has remained that way for nearly an hour. Tried switching off both cable box and TV, disconnecting and reconnecting cables, but no luck. Finally unplugged mains, waited a minute, then turned back on. Everything seems normal now after the reboot. Phew.

Sony KV-36XBR450... | Answered on Feb 11, 2008


i have sony 24"tv they have no picture but having sound.what do you think this problem

Sony KV-36XBR450... | Answered on Feb 04, 2008


Sony usually has a button on remote....MTS maybe....push =
cycles....Main...SAP....Mono.....
SAP = second audio program...........................T.

Sony KV-36XBR450... | Answered on Dec 03, 2007


Hello buddylaw,

Can you post a picture of the TV screen with the problem? It will help in the diagnoses. It looks like you may have a thermal sensitive component causing this issue. But I will have to seen a picture of the screen to properly diagnose this problem as to the possible section that may be causing this problem.

Thank you.
Shuttle83

Sony KV-36XBR450... | Answered on Oct 31, 2007


This might be caused by the CRT or by the chroma circuitry. You will need a schematic diagram and a multimeter set to read voltage. The first thing would be to look at the voltages on the CRT socket. With the TV on and the back off, using the schematic measure the voltages on the CRT socket and see if they match the schematic, if they do not (and they wont) find out if the Red Cathode voltage is too high of to low. If too high the red video circuitry might be at fault if too low the CRT might have a Cathode to grid short. In either case power down the TV and with determine if the CRT is bad (using a CRT Tester / Rejuvenator) Run a series of test acording to the instructions of the CRT Tester. This will tell you if the CRT is bad and if it is bad what problem it actually has. Then you may or may not have to rejuvenate the CRT (follow the instruction on the Tester / Rejuvenator) to do this. If the CRT is not bad then you will have to test the chroma video circuitry to see which component is causing the problem.

As you see you will need some equipment to do the job with. and you will have to have a little bit of an electronics background, If you do not have these I would suggest that you take the TV to a qualified TV repair shop for servicing.

I hope this helps,
Thank you,
Shuttle83 

Sony KV-36XBR450... | Answered on Oct 31, 2007


He probably means the Deguassing coil, which is around the set. This is needed when the set is first turned on. Because of the earth polarized field, when you turn your set to the east, west or just a different degree, it affects the Deguassing area. This sometimes looks like a rainbow affect in your set, and sony's are bad about them. But all in all Sonys are good sets. If it does not go away it could be a problem with your picture tube, or the is a Magnet somewhere close by, like speaker or some type of big magnet. If so then remove Magnet and turn off and on until disappear. Is the pic good when running? Does the set comes right back up if you press power and wait another 11 to 15.?

Sony KV-36XBR450... | Answered on Sep 09, 2007


The set is definately in the SAP mode, which will have some channels in spanish and some channels with no sound at all. You might be able to get an inexpenxive universal remote and go through the menu to return the audio setting to stereo, but if that does not work then you can order an original Sony remote by model number from Union Electronics at 800-648-6657.

Sony KV-36XBR450... | Answered on Jul 08, 2007


Sounds like the PIP feature is causing the problem with the TV if you are connected directly to cable TV without a box inline and getting these issues.

Sony KV-36XBR450... | Answered on Apr 12, 2007


ditto bad flyback

Sony KV-36XBR450... | Answered on Dec 11, 2006

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