IN THOMSON CRT COLOR CHASSIS NO TX70 VST, DEFLECTION COIL LOAD RESISTOR BLOWN AND RESISTOR COLOR CODE NOT VISIBLE. SO HELP ME TO IDENTIFY THE VALUE OF THE RESISTOR.OR CAN I POSSIBLE TO CIRCUIT DIAGRAM

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Circuit diagrams of many popular brand TVs and other devices are given

Cl031 is the sfaety retrace capacitor check DL030 an the HOT trans they are most likley blown as well. Usually if anything other than the Hot and DL030 are blown the entire deflection board will need replacement. Its also best to check all three of the CRT necks to be sure none are cracked and broken on the CRT necks . Unfortunately several designs of the deflection components had different parts although the deflection boards will usually interchnage bewteen the ITC222 chassis sets. The ITC222A will not interchange. www.tvrepairworld.com has replacement parts and boards and can also assist with part numbers that you require.

HI.We cannot really but identify the correct resistor value unless we can identify or determine the color coding on the resistor.Each color has a corresponding value and tolerance as well.If you can't indentify the color coding then you can refer to its diagram usually printed out on the side of the control board or near thecontrol board.We cannot but cannot give a guess value unless color coding is given.Thank you for choosing FIXYA.

I looked at the same chassis I have and the resistor has color bands green blue silver gold wich is a .56 ohm 5% 1/2 watt resistor

Depending on the resistor, the values for a resistor is color coded, meaning that there are a couple of lines of colors and each color line represents a value. Do a google on Resistor coloring chart and you might find your answer. If the resistor is a surface mount one and very tiny, you might be out of luck as these are too small for the manufacturer to print the part number on. Only the manufacturer has that part number and can be very hard for you to contact them about.

Hello,


CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.

Hello,

CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.
Good luck..

U can see one or two bands of the colors of the resistor right?Compare it to a couple resistors beside it or around in the board.U should know and determine it values.

There are some low-value (1-2 ohm) 1-watt resistors in each convergence yoke circuit. Most often one will get toasted when one chip fails. Problem should be visible to inspection.

find the change value capacitors and resistors in the convergence section!