Video problem tv has no video,but sometimes shows a picture than pic goes out. tried video processor ic2200 same problem,checked abl line and voltage. check v&h pulses, checked data and clock lines.

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/

The fact that you have no menu or onscreen display, leads me to believe that it is the main logic board. Either the processor ic or the voltages going to the main board are missing. Check to see if the main board is getting 5v and 3.3v to determine if it is your power supply not supplying the voltages or your main board.

This is a fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Thank you for using Fixya.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

The fault is the FAILURE OF THE SOLDER IN THE VERTICAL IC OF THE TV.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

It is possible that TV processor could have some garbage it do to a small voltage surge, and if you leave your set, unplug from the wall for 40 min,. that will reset it back to normal. If thgat don'rt work then remove the back and check for a couple of bulged electrolytic caps on the power supply nthat need change, or change out the power supply.

We know that high voltage and raster are okay. Suspected defective circuits are somewhere in the video drive chain or power supply system, so
the problem is definitely not a quick fix. Although the problem could be bad connections and weak filters which should be checked first.

After checking for quick fixes, you need to check video drive circuits which entails checking the video output wave form from the luminance processor. If video is not present check composite video coming into luminance processor. If input ok check voltages going to processor to determine if problem is power supply or processor. If input is not ok to luminance processor trace back to I/O port where the video switching processor is located. Check for input to input I/O processor. If good check I/O processor output, and if bad check voltages going to processor and switching data port to determine if processor, power supply, or systems control circuits are defective. If input to I/O processor is bad then trace signal back to where it is good and repair applicable circuit[s].

Sorry for delay, just back from vacation...

The pictures look like you have white retrace lines which indicate that all the colors are working. No picture would indicate there is either no video signal present or the video processor is not functioning. If the set has an RCA video input try connecting a video game or other composite video source (remember to set the tv to the aux or video input). If you then get a picture the processor is working and the problem may lie in the conversion of the over-air video signal. If you get no picture with any input type I would suspect the video processor chip (probably the largest chip on the board). See if you can find a Datasheet for the chip and check the voltage input(s). If the chip (or any chips) get excessivly hot they would also be suspect.
Keep me posted on any progress...

the tv turns on fine, but after 5 - 30 min or so, "sometimes MORE " the picture all of a sudden go's black. Sound is ok it is 100% loose contact problem. 1 please check for any connector or print for loose. 2 in signal processor ic there might be loose. remember there is no component failure.

Hey John, How many times does the light blink? No blinks - Problem in the standby power section. Might check fuse, R607, Q601, IC601, R612 and VDR601 (should show open). Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective. One blink - not used for the self-diagnosis Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits. Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672. Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505 Five blinks - AKB circuit (automatic kine bias), 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 Cboard, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly. Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206. Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits. Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some newer models of Sony TV sets, this code means that T8005 is defective on the D board. Nine blinks - Replace D 6116 and D 6301 on the "G" board, do not resolder as this will fix the problem temporary. Or Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing, then change the switching regulator on the "G" board or check connections. Make sure the regulator is -12 or -13 (negitive). Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board. I suggest you do a hard reset. Unplug the power cord for 4 hours. Then plug it back in and check it. If it works, great. It not, cost of repair for this is usually around $150 - $250 plus the house call.

My panasonic Tv pic suddenly turned into a blue color I can't see the pic any more just can hear the audio.....any solutions????