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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
There is short circuited component/s at its horizontal scan output stage circuit. Check the horizontal output transistor first. Check it for collector to emitter, or collector to base, leak. Replace it with the same numebr, and check. If it do not help you, check and replace the Line Output Transformer [LOT]. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.
You need a new frount control raster for this TV, what has happend is this little circuit board under the buttons has given out. You might have lost the function to control with the remote as well. The best thing to do here is take it to a tv repair shop. and have it looked at.
Diagnosis: bad control raster
Prognosis: replace raster with spare or new
Do not shoot the messenger please do leave postive feedback and ratings today.
Oh dear ! I fear my answer may not be what you want hear but my advise is free. Bright green raster with Flyback (retrace) lines may indicate a heater cathode short in the tube (crt) this causes a sharp increase in beam current and the power supply shuts down into standby mode. To prove the point isolate the red and green cathode pins on the tube base and cross couple the red video output stage to the green cathode pin and the green output to red cathode pin using wire links. If set now comes on with bright red raster the fault is in the green video output stage and not the tube. If still bright green then tube is most likely cause. Gently tapping the tube neck may prove the point, but take care the tube neck is thin glass and if hit too hard will break compounding your problems. WARNING if you do not feel totaly confident to attempt this level of repair there is no shame in seeking the advice of your local service technician. Safety first always
Picture goes to high green with retrace lines that shows picture tube is defective and requires replacement. Usually in above symptom, TV goes to standby mode and standby light blinks when green raster problem occurred. New TV is better option because picture tube of KV-34XBR960 would not be available any more. Thanks.
You may have lost the standby power supply. There should be a 5v supply
that runs with the set in standby, see if you can find that. Also check
for B+ (around 160VDC) at the large filter capacitors in the power
I am unable to find in your statement about which brand or type of motherboard is used. One thing i come to know your using service mode kit. knowing in your statement your are a technical person. My simple idea is first you set the TV in standby mode using remote. Then in FBT reduce the screen control minimum position, the release standby. Now the tv is oscillated, now slightly increase screen control till get maximum video and zero retrace line set in position. Even no improvement give me clear picture of brand and microprocessor ic etc. there is a chances to solve by having the above details.