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SONY KVXA34M31--- REPLACED HT FLYBACK TRAFO-- PROTECTION CIRCUIT IS CLICKING IN -- I KNOW OF SOME MODS THAT GOT TO BE DONE ON --AS IT IS A COMMON FAULT-- CAN YOU PLEASE HELP WITH THE MODS . Regards Ruben

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Does KV-XA34M31 standby light flashes? If yes, how many times?

Posted on Dec 29, 2008

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Hi and welcome to FixYa,

If it is using chassis BG-3R, this might help?

Good luck and Thank you for using FixYa.

Posted on Dec 29, 2008

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Should you really be Modding you TV, What if something breaks, If it does or is already broken then you should contact Sony, Don't attempt it yourself!!

Posted on Dec 29, 2008

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Sony KP-57WV700


Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads.
Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself
The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition.
Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!

Jul 02, 2012 | Sony KP-57WV600 57" Rear Projection...

1 Answer

The TV will not turn on. It blinks in standby for 6 times and shuts down.. Unit is about 10 yers old.


6 blinks = No Horizontal (H STOP), no raster, goes to the blinking self diagnosis
function immediately. Check C515 & 516 and the jungle IC, IC206 (or similar component references for your model) and replace flyback transformer if required.

Generally, whenever horizontal OCP (over current protection) occurs, the primary cause is usually the flyback transformer (these short circuit/burn out), the horizontal output transistor(s) and the tuning capacitors in the transistor(s) collector circuit must all be replaced together. It is also a good idea to check the ABL (or beam limiter) circuit as components may have been compromised in it due to the failing flyback.

You could take it to a service centre and obtain a quote for estimated repair costs, then you can decide afterwards if it is worth repairing or not. It may not be economical and/or expensive.

Mar 03, 2011 | Sony FD Trinitron WEGA KV-34XBR910 34" TV

2 Answers

My tv is blinking 7 times repeatedly. (The red standby light) What does this idicate and what can be tried before I take it to a repair store?


The blinking standby LED usually is an error code - indicating possible overcurrent protection mode. It can be either a short-circuit in the power supply, the HT rail, or the horizontal output transistor(s) could be shorted along with the flyback transformer. Or it could be a combination of all of the above.

Assuming this is a model with a CRT, I doubt it would be the 'bulb' - it would most likely be a circuit failure. Check the flyback transformer, the horizontal transistors and the tuning capacitors in their collector circuit - one may be shot.

Check the power supply and HT thoroughly for shorts and open circuit components - burn marks on the board, dry solder joints etc. Look for obvious things first.

Once you are satisfied that one or more parts have shorted, and you don't wish to replace them yourself, submit the TV to a repair store and insist on a FREE quote - this way, you can then decide if you want to pay that estimate to fix it or not.

Feb 17, 2011 | Sony FD Trinitron WEGA KV-32HS420 32" TV

1 Answer

Audio and picture go dead red light blinks 7 times


A protection circuit has cut in - possibly due to a fault in the line output stage (flyback transformer could be short-circuit and horizontal output transistor could also be shorted).

Assuming the power supply/HT rail is all OK, replace the above parts, touch up any suspect solder joints, check and replace any capacitors (electrolytic and the tuning caps in the collector of the horizontal transistor - always replace these caps (rated at around 2kV - 6kV) whenever you replace the flyback)

Jan 24, 2011 | Sony FD Trinitron KD-36XS955 36" TV

1 Answer

Why does standby light keep blinking constantly and picture keep flashing off and on


Could be any one of a number of factors, including:

a) a protection circuit could be malfunctioning;
b) your flyback transformer is arcing, hence the flashing picture;
c) power supply is not oscillating at the correct frequency, causing varying HT and affecting the line output stage;
or
d) worst case scenario, your CRT could be shot, which would make the set uneconomical to repair due to tube replacement cost.

DON'T PANIC ABOUT THE CRT JUST YET: I would advise checking every component (look for dry solder joints and resolder accordingly) on the main board thoroughly, starting with the power supply and working towards the horizontal output stage, in particular checking all the tuning capacitors in the collector circuit of the output transistor, making sure none of them have dropped in value, as well as the transistor itself.

Once you have completed all checks, if it turns out the flyback transformer is the true culprit, replace both this and the horizontal output transistor with correct type numbers. You should be able to order new ones. This is just a starting point suggestion here, but it may bear fruit and could save you hundreds of dollars in workshop charges/fees.

Jan 01, 2011 | Sony FD Trinitron WEGA KV-24FS120 24" TV

1 Answer

SONY Trinitron (POWER on. Black screen.)


This is not the flyback, if the model is the one listed in title, it has no flyback, has it is a rear projection. The motherboard is possible, but also C board and D board are likely.

If there is a flashing led on front of the TV, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1 The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the TV will reset just unplugging power cord for one or two hours, sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr suddenly are a blown capacitor on power board, a convergence IC has blown, or a faulty on Digital board.
check also the video cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Check also connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact SonySony Global - "Contact Us".

If you want to repair at your own expenses, just locate any good qualified repairer.


Regards

Mar 06, 2009 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Flyback board for RCAd52w20


a bad flyback will inhibit the protection circuit. This sounds like what's happening.

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

5 Answers

Sony KV-36XBR250 - no picture, good sound


This is a common failure mode (which I now share), and has nothing to do with the picture tube or surge protection. From the forums I have searched to-date, it appears to be a failed component in the flyback circuitry, but Sony will not admit to an inherent defect. If anyone has ACTUALLY FIXED this problem, please post a reply. Guessing won't help anyone. Thanks.

Oct 24, 2006 | Sony KV-36XBR250 TV

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