Help With Vertical Circuit. Capacitor getting extremely hot

[IKC2E51R8]

My Thoughts too, im going to leave it as the 2.2, but I'll check those other resistors Chris suggested to see if any have gone high in value.

[IKC2E51R8]

R417 in the manual is 100k but fitted is 120K and its measureing at 117.6k. R416 is 33K measuring at 32.1K.

[IKC2E51R8]

R420 is a 1.2K measuring at 1K and R437 connected in parallel with it is a 2.7K Measuring at 2.1K

[Maarten]

Originally Posted by Chris55000

Unfortunately it's not unknown for these very large "jungle" multi–everything i.c's such as the TDA8361 (U201) to develop a fault in their vertical oscillator/drive section, and this very commonly shows up as part scan/foldover such as you depicted in your picture of your set–there are three or four types of this with different suffix letters (A, E, N3 and N5) and it's important that you get the right one!

In this regard, please note that while A and E are suffix letters behind the type number TDA8361, N3 and N5 are not! N3 and N5 are mask numbers (revision numbers of the actual silicon circuit), you can identify those by looking at the separate number behind the date code (bottom line of the stamping). For N3 this number is a 3, for N5 a 5, etc.

[IKC2E51R8]

new problem, my meter slipped when checking the voltage on D405, dont know what it hit, probably the horizontal line pin, there was a sqeak and the set shut down, it comes back on but no pic, standby led dimmer than usual, Ive got a horizontal line if i turn up the g2, no 26v coming off Pin 5 of the flyback for the vertical. 110v going into the flyback at Pin 3.

any ideas?

[Red to black]

Oh dear! or words to that effect I am sure you will sort it.

[IKC2E51R8]

Can anyone help with this, I dont get why Pin 5 has no voltage on the fb when 110v to the flyback is present and the set starts up

[Red to black]

You won't get a sensible DC voltage reading directly from the pin of the FB transformer as it is predominantly a pulse wave form at line scan rate here, you need to check at the relevant rectifier/smoothing cap for that line derived rail.

[IKC2E51R8]

well dont i feel stupid, that was explained to me before, still such a noob at this.

Checked the reciftier I either get 0v or 0.1v, replaced the recifier, same thing.

[Red to black]

Is the feed resistor from that pin ok, it probably is a fusible type, I am only going by things generally here as I don't have the circuit.

[IKC2E51R8]

I've put the set away for the night as i was just getting more and more annoyed at myself for letting the probe slip and cause this. I havnt checked that resistor yet but i know which one it is its a 68ohm fuseable that i did have to replace before so it could very well just be that thats all thats wrong (here's hopeing)

[Red to black]

Another thing, never ever feel stupid, you are obviously still learning, you seem to have the tenacity just keep trying you will get there in the end.
He who has never made a mistake has never made anything, we have all dropped a bollock from time to time

[IKC2E51R8]

Here's the vertical circuit

[Red to black]

Thanks, I am back at work tomorrow morning, I will catch up with you later

[IKC2E51R8]

Thanks, Still learning true, I'll keep at it. I'll eventually get this set fixed, just gotta be patient...and probably order more parts still have to fix the original problem once this latest one is solved

[Red to black]

Just looked at the snippet of a diagram, that feed (R408) resistor looks to be 0.68 ohms, not 68 as mentioned up thread, 68 ohms definitely seems on the high side in that position.

[IKC2E51R8]

You're right it is 0.68ohms. Dont know why I had 68 in my head, I'll check that resistor tomorrow when ive a bit of free time and see if its a dud

[IKC2E51R8]

Just checked that feed resistor and its open, off to eBay I go to order some

[Red to black]

We will wait and see how you get on, hopefully you don't need another frame chip

[IKC2E51R8]

so I actually found one from a spare board from a philips, fitted it and...nothing, same result, doing some other snooping at other parts of the circuit and i dont want to sound silly but ive a few questions that only you guys can answer for me...

1) On the Primary side of the Horizontal Driver Transformer Ive no continuity, I do on the
Secondary side, Im 99.9% sure thats a problem.

2) The Horizontal Driver Transistor I Believe has a Collector to Emitter problem, shouldnt this show as OL on a multimeter using diode test mode? Im getting a reading on it.

3) R406 Feed resistor to 110v supply for the Flyback is getting very hot if the set runs for minute. C406 was getting warm but not hot.

I have a single horizontal line when the set runs, if all of the above constitues a problem with the Horizontal circuit should i not have that line at all and would the flyback even start as it does with the above problems?

Trying to understand this a bit more so i can narrow down this fault