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Sony AKB error picture wont come on. is there any way to override this diagnostic

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Sony TV set, KV20FS120 BA6 chassis: light blinks, set isn't coming on. Why?


Sony sets like this have a built-in self-diagnostic function.
The blinks of the Standby LED are the self-diagnostic codes.
There may be more than one error. The blinks indicate only the first error.

Unlug the set. Wait 30 seconds.
Prepare to count the number of times the Standby LED blinks.
Plug the set back in. Count the blinks.

2 blinks
  • Diagnostic Item Description: +B overcurrent (OCP)
  • Probable cause:
    • H.OUT (Q506) is shorted. (A Board) (20"/21" models only)
    • RGB Amp (IC1751) is shorted. (CV Board)
  • Detected Symptoms:
    • Power does not come on.
    • Load on power line is shorted.
4 blinks
  • Diagnostic Item Description: I-Prot
  • Probable cause:
    • +13V is not supplied. (A Board)
    • IC545 is faulty. (A Board)
  • Detected Symptoms:
    • Has entered standby state after horizontal raster.
    • Vertical deflection pulse is stopped.
    • Power line is shorted or power supply is stopped
5 Blinks
  • Diagnostic Item Description: IK (AKB)
  • Probable cause:
    • Video OUT (IC545) is faulty. (A Board)
    • IC001 is faulty. (A Board)
    • Screen (G2) is improperly adjusted.
  • Detected Symptoms:
    • No raster is generated.
    • CRT Cathode current detection reference pulse output is small.

The above may be of little help. Your best bet is to download the service manual for the KV20FS120.

...Google search: Sony KV20FS120 service manual

Apr 26, 2016 | Sony Televison & Video

1 Answer

KDS-R60XBR1 AKB circuit fault


AKB is auto kine bias---means a problem related to one of the three picture tubes or the boards connected to each---if it showed in error buffer with a number to the right that is the number of times the error has been detected.

Aug 29, 2012 | Sony KDS-R60XBR1 60" Projection HDTV

2 Answers

I have a sony trinitron kv36fs210, no sound no picture, stand by light blinks 5 times, tried unpluging for 24 hours, same problem. google searched problem,results found akb circuit problem, im not a tv...


It seems to be a problem to the power supply unit. I would suggest you have a look at the circuit board and look for capacitors that could have a popped up head. If you notice any, replacing it would solve your problem. I had the exact issue with my tv and fixed it that way. If you have any question please do not hesitate to ask, good luck.

Aug 30, 2011 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

1) I have a Sony KV-32FS13 that has a green tint in the picture. Does any oneknow how to access the service menu for this model? I tried other adjustments and I can't get rid of the annoying green...


Code 5 is "AKB error". AKB, or auto kine bias, is a cicuit that monitors the three color guns of the picture tube (red, green and blue) and tries to adjust them for proper color balance. If it can't, the picture is blanked (usually) and the timer/standby light blinks 5 times. When the color drives aren't balanced, you see a color tint in the picture like you're describing.

There might be a problem in the AKB circuit, or the picture tube may just be old enough that the AKB circuit has run out of adjustment range. If the tube is at fault, you should consider replacing the set. A new tube will cost nearly as much as a new 32-inch LCD TV, and you'll need to pay someone to install it and set it up. There are special tools required to perform the convergence which gets the color guns aligned with the face of the tube so they hit the right colors.

If you'd like to try tinkering with the service menu adjustments, this site explains how to access the menu and gives a list of settings.

Jan 02, 2011 | Sony KV-32FS13 TV

1 Answer

The tv is at least 17 years old.The blinking red light blinks 5 times ,then the tv picture goes off . The voice is still on


Five blinks is the error code for an AKB (auto kine bias) error. What this means is that the set isn't able to balance the three color guns (red, green and blue) of the picture tube properly, and it's blanking out the screen.

To get the proper colors, the signals for the three colors need to be balanced, and Sony sets have circuitry to do this automatically. Other brands don't, and when they go out of balance you see a picture that starts to show tinting or colors that are off. As the picture tube ages, it gets harder to adjust the balance until finally the AKB circuit can't anymore, and poof, the picture goes away. With a 17-year-old tube, it's not surprising.

There isn't anything that can be done to fix the picture tube, it would need to be replaced. But the cost of the tube and the work required to get it set up after installation makes it completely uneconomical to repair this TV. A new picture tube is nearly $200. Then special tools are required to set the tube up (a process called convergence), so you'd need to find someone to put it in, and possibly pay to have the old one disposed of. A new 32-inch LCD set is around $350 now. Treat yourself to a new one.

Jan 01, 2011 | Sony FD Trinitron WEGA KV-27FS120 27" TV

1 Answer

2002 Sony KP53s75 is it worth repair?


Ok, 5 times is an akb problem, and without red, this tells me one of three things are most likley wrong either the red tube is too weak to produce return current to the akb circuit, or you have a bad driver on the crt board or you have a defective focus block. There are several diagnostics that need to be done to determine which one is the cause, if you are un familure with electronic repair it could be a little hazardus to do, so i don;t recommend it unless you are aware of the issues. If you swap the neck modules with the blue tube, and the set looses blue then it is not the tube. and might be worth repairing. but again if you don't have experience it may not be a good idea for you to try this yourself.

Sep 01, 2009 | Sony KP-53XBR45 53" Rear Projection...

1 Answer

Sony KV36FS120 9 blinks, picture will not come on set


does the screen light up at all if not rejuvenate picture tube

Mar 29, 2009 | Sony KDS-R60XBR1 60" Projection HDTV

1 Answer

'standby' mode and akb error number


AKB 66 in self diagnostic test means...TV goes to standby (shut-off) for AKB problem 66 times. AKB is White-Balance signal and it is not proper or maintained in your TV. So error signal produced and TV goes to shut-down state.
Regardnig Standby button, its available on remote only. If you push TV Power switch, TV will switch ON, push it again to OFF TV. Power Button on remote set TV in standby status and you dont need to push power button of TV itself.

Aug 14, 2008 | Sony KP-53HS10 TV

1 Answer

Sony KP-51WS520 Stand by flashes 5 times


When a Sony TV flashes five times, that means that there is an AKB circuit fault.
This means that there is something wrong with the video.
When you get this error, several IC and components concerning the video signal must be tested and eventually replaced.

Mar 13, 2008 | Sony KP-51WS520 51" Rear Projection...

1 Answer

Picture cuts out


If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. The five blinks(count them again just to be sure) is an error codes that stands for the following: "FIVE Blinks---AKB circuit (AKB), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. Also unit be in IK blanking, try turning up screen slightly." So what is the AKB? It is Auto Kine Bias; a circuit that holds the video OFF until the picture tube (kinescope) is warm enough to run video. So, if there is trouble within the AKB it may not be turning on the crt. Or, the crt could be cold, or there could be power supply problems (which I favor because the audio is gone, too, which means it is not a "video only" matter). Therefore, I do not favor replacing the C board (or A board as indicated in the url above). I favor finding out why the AKB circuit is not functioning. It is necessary to get the set to come ON long enough to make sure the crt is heating up. You may have to manually defeat the protection circuit and force the set to come ON. If you can find the ON relay you may be able to hold it ON manually - at least long enough to find out more symptoms, but not too long or some further damage may occur. Go to: http://www.schematicsforfree.com/archive/?path=Sony%2FVideo where you may find a schematic or service manual for this set - or one that is close/similar enough to be of great value. Last comment: Some sets will, upon failure of the AKB function, after a few seconds, go into diagnostics - which is similar to protection. So, the audio may be working okey. Turn the set on with the volume up; if you hear audio for the until the set cycles into the flashing light routine it means the audio is really good. So, check that carefully. You may have to do a hard reset to cause the AKB function to reset. So, do this: Unplug the power cord for 4 hours or more. That will reset everything. Hope this helped, or gave you a general idea, but please don't take a further step unless you know the safety issues involved. Good luck

May 18, 2006 | Sony KP-61HS10 61" Rear Projection...

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