Not sure of the resistor value of this

[korotoyo]

Im trying to fix a 14 inch CRT tv with few flickering white horizontal lines at the bottom of the screen. These flickering lines gradually disappear when using the tv for maybe 5 minutes or more. They only appear when I turn on the tv after being unused for maybe 30 minutes or more.

I read somewhere that it's related to the vertical ic section especially the capacitor. Upon checking I suspected a capacitor and a resistor. I started with the capacitor by desoldering one leg and lifted it. I wasn't really sure but I tried turning on the tv after a 30 minutes rest and was surprised to see no white lines. I tried it again by leaving the tv off for more than an hour. I turn on the tv and still no white lines. Yehey!

One thing that bothers me though is about the resistor I tested with a multimeter which reads about 9 ohm and has a 5 color band as brown,black,black,brown,gold. I'm not really sure if it's actually a 10 ohm or 1k ohm resistor. Do I need to desolder and remove the resistor from the board to actually check its actual value?

I hope somebody can help me identify this resistor. Please see attached picture.

[petehall347]

Re: Not sure of the resistor value of this

code says 1k 5 percent ..what does schematic say ?

[korotoyo]

Re: Not sure of the resistor value of this

code says 1k 5 percent ..what does schematic say ?

That's the problem I can't find any schematics for this tv. It's a Changhong 14A01PH crt tv.

It looks like it's a 5 band resistor in which online resistor checker tells me it's 1k 5%. But can also be a four band resistor, 10 ohm?

[korotoyo]

Re: Not sure of the resistor value of this

Sorry for the title of this post I forgot to add the tv model.

[dskall]

Re: Not sure of the resistor value of this

Only need to lift one end to check it

[R_J]

Re: Not sure of the resistor value of this

the usuall cause of lines at the bottom of the screen is a cap. in the vertical circuit output, If the lines were at the top it would be screen bypass cap. c486

This could be the schematic? if not it could be close could be c304 or 307 which are in the output

[Andrew F. Ali]

Re: Not sure of the resistor value of this

1Kohms 5%...Trust me..

[Agent24]

Re: Changhong 14A01PH - Not sure of the resistor value of this

Do I need to desolder and remove the resistor from the board to actually check its actual value?

Yes. Unless you know for certain there is nothing in parallel with it. But it is usually faster just to desolder one leg and test.

[keeney123]

Re: Not sure of the resistor value of this

So it looks to be 1K ohm 5 % tolerance with 100 parts per million per C temperature coefficient . That means for each degree C increase from ambient the resistance will not change more than 0.000100 ohms

[Andrew F. Ali]

Re: Not sure of the resistor value of this

1Kohms 5%...Trust me..

I think I made an awful error here.......Brown Black Black Brown GOLD Brown....is actually read just like a 5 band resistor....however we see here 6 bands which suggests 1 0 0 1 X 0.1 +/-1% which should be a 100.1ohm resistor +/- 1% tolerance.....This is a very hi-precision resistor.
What circuit is this from/used?

[korotoyo]

Re: Not sure of the resistor value of this

the usuall cause of lines at the bottom of the screen is a cap. in the vertical circuit output, If the lines were at the top it would be screen bypass cap. c486

This could be the schematic? if not it could be close could be c304 or 307 which are in the output

Thank you for this! It looks like it. According to the schematic the R313 resistor I suspected is 1k ohm. The capacitor I removed at C310 which is causing the white lines at the bottom of the screen has a two line label. First line reads "0.033J" & second line reads "100". Schematic says it's "100V0.22u".

TV is working perfectly fine now even without the C310 capacitor. Should I replace it or just leave it that way?

How do you check the chassis no. anyway? I can't seem to find it anywhere on this tv.

Only need to lift one end to check it

I desoldered and lifted one leg of the R313 and tested it with my DMM. It reads 0.998k ohm. So it looks fine.


Thank you guys!

[korotoyo]

Re: Not sure of the resistor value of this

I think I made an awful error here.......Brown Black Black Brown GOLD Brown....is actually read just like a 5 band resistor....however we see here 6 bands which suggests 1 0 0 1 X 0.1 +/-1% which should be a 100.1ohm resistor +/- 1% tolerance.....This is a very hi-precision resistor.
What circuit is this from/used?

It's from the vertical output section of a CRT TV Changhong 14A01PH.

[korotoyo]

Re: Not sure of the resistor value of this

One more thing, as you can see from the 1st picture, tv screen is a little tilted. I tried the service mode menu but I'm not sure which of those settings to adjust if it's even possible. I read somewhere that you can set it by rotating the yoke. I'm not so sure how to do it though. Is this easy to do?

[budm]

Re: Not sure of the resistor value of this

I still suspect bad lytics caps around that Vertical IC.

[gabiz_ro]

Re: Not sure of the resistor value of this

Deflection coils block is problem of tilted image.
Need to be realigned.

[petehall347]

Re: Not sure of the resistor value of this

see those brown discs on the back of the tubes by the yoke with levers ?
looks like they have been moved . the yellow marks are not inline .
saying that they have been moved to align it . try each one a little amount and see what happens to the picture . best to have a large mirror in front of screen to do this .
if i remember correctly the discs move picture in a parabolic fashion .
also see if whole yoke has been moved at all .

[Agent24]

Re: Not sure of the resistor value of this

First line reads "0.033J" & second line reads "100". Schematic says it's "100V0.22u".
TV is working perfectly fine now even without the C310 capacitor. Should I replace it or just leave it that way?

Yes, replace it. It will have a reason to be there. They don't just put parts in that do nothing. If they can save money by taking them out, they will.
Sometimes the schematic is wrong. Or for a slightly different model or design revision. I would use the same value capacitor as was in the TV.

[korotoyo]

Re: Not sure of the resistor value of this

Yes, replace it. It will have a reason to be there. They don't just put parts in that do nothing. If they can save money by taking them out, they will.
Sometimes the schematic is wrong. Or for a slightly different model or design revision. I would use the same value capacitor as was in the TV.

Ok but I'm not sure what to buy. What are those printed on the little blue capacitor that I removed mean? "0.033j 100". The ones I know are caps with something like "10v 220uf".

[korotoyo]

Re: Not sure of the resistor value of this

Deflection coils block is problem of tilted image.
Need to be realigned.

How can I do this? When you say "deflection coils block", do you mean the yoke?

I loosen the screw on the clamp and I tried to rotate the yoke but it won't move. Probably because of the white adhesive between the yoke and the black padding on the tube. I'm not sure how to proceed.

[budm]

Re: Not sure of the resistor value of this

Ok but I'm not sure what to buy. What are those printed on the little blue capacitor that I removed mean? "0.033j 100". The ones I know are caps with something like "10v 220uf".

0.033uF 5% Tolerance, 100V, Polyester film (more likely).
Does it show as bad? Leakage resistance?