phillips lcd keeps blowing fuse

[TimT]

Re: phillips lcd keeps blowing fuse

I dont know much about this TV if it was a lighting strike that damaged the board could that effect the other boards?

[TimT]

Re: phillips lcd keeps blowing fuse

just pulled SA1601 it's bad then i pulled C6106, C1605 there bad then I checked the other side of transformer and more were bad..pulled 12 in total of this type all bad. Had to recheck my meter with good cap I was thinking it was messing up.. but it's good.
checked other resistors bad. must have been a massive surge on this board? time to buy another board

[Dgtech]

Re: phillips lcd keeps blowing fuse

Ok, the reading that you got from the resistor and the capacitor are correct readings for those. Resistor's ohm values will vary from resistor to resistor, in this case, this resistor should have read high and it did read high. The other resistor that you measured that read 269 most likely is a 270 ohm and reads fine as well (red violet brown are its colors probably).

Anyways... The other component I spoke of earlier was SA1601. you can check this one as well.

[TimT]

Re: phillips lcd keeps blowing fuse

the third component? I thought it was the 2 transformers the resistor and capacitor?

[TimT]

Re: phillips lcd keeps blowing fuse

the probes apart it reads 1. I've been calling that 0 and I probably shouldn't have. probes together reads 0. setting the meter to 2 K on a brand new resistor reads 269. reversing the probes I get the same reading. when I try this on the resistor I pulled from the board I'm getting a 1. testing the capacitor the same way I'm getting a 1 in fact no matter what setting I use I get 1. testing a new 2200uf 35v with a meter set to 2m I get .740 and -.295

the only time I could get a reading with the Transformers was to set the meter to 200 and the reading was .002

[Dgtech]

Re: phillips lcd keeps blowing fuse

R1609 is 0 no reading at all on meter. tested other resistors of same type tested good. pulled C1602 dead 0 on meter. wanted to make sure i was testing the cap correct. tested on new cap. new cap test ok! so bad cap and resistor?

I am unsure of how you tested these components. It all sound so confusing when you explain what you did to find both a 3 Meg ohm resistor and a capacitor to both be bad. Both should read high resistance (ohms). There is no way that I could agree that these both would be shorted which means no resistance (zero ohms).

What happened to the 3rd component I wanted you to check?

Help me to help you. When checking resistance (horseshoe) - If you put your meter leads together, what does the meter read? With the leads apart what does it read?

[TimT]

Re: phillips lcd keeps blowing fuse

I would just run it for testing purposes until I ordered the correct capacitor. I tested the new resistor 270 olm retest the old one and it is apparently bad. yes i am getting 1 on meter.
so I would need to download the service manual to find the correct specifications on the resistor? in order to replace it with a correct one.

[tom66]

Re: phillips lcd keeps blowing fuse

You can run the TV briefly without it. It will emit a lot of radio-interference so could be a hazard to CB operators but otherwise shouldn't be an issue. If you can ensure TV will always be in US or Canada (115V only), a class-X 250V cap should be fine. (An ordinary cap could be a fire hazard.) You can't use a 250V cap in 230V areas -- minimum is 315 or 330V for some reason...

[TimT]

Re: phillips lcd keeps blowing fuse

the capacitor is 0.1 uf 340v can I replace it with 0.1 uf 250v metalized film capacitor? I'm pretty sure the meter does read 1 but I'll double check when I get home.

[tom66]

Re: phillips lcd keeps blowing fuse

OK... that cap seems bad!!

Just to check, meter leads not touching, reads single "1".

[TimT]

Re: phillips lcd keeps blowing fuse

horseshoe

[tom66]

Re: phillips lcd keeps blowing fuse

200 - "horseshoe" or 200 - V?

[TimT]

Re: phillips lcd keeps blowing fuse

the meter was set to 200. I measured the resistor on the board the capacitor out of the board.

[Mark369]

Re: phillips lcd keeps blowing fuse

so i would think c1602 and r1609 is bad.
what setting did you have your meter on. 20M, 200K, 20K, 200?
and when you measured they were out of the board right. you tested in both directions?

[TimT]

Re: phillips lcd keeps blowing fuse

R1609 is 0 no reading at all on meter. tested other resistors of same type tested good. pulled C1602 dead 0 on meter. wanted to make sure i was testing the cap correct. tested on new cap. new cap test ok! so bad cap and resistor?

[Dgtech]

Re: phillips lcd keeps blowing fuse

I pulled 1601 and 1602 showing 00.2 ohms on both. did i need to test something on the board with these removed?

The measuring of the transformer is not going to be accurate for now. Read the ohms across R1609.

[TimT]

Re: phillips lcd keeps blowing fuse

I pulled 1601 and 1602 showing 00.2 ohms on both. did i need to test something on the board with these removed?

[Dgtech]

Re: phillips lcd keeps blowing fuse

Here is another way to look at it from your point of view.

[Dgtech]

Re: phillips lcd keeps blowing fuse

You are correct, L1601, i read wrong. Look at my notes on the schematic below.
ALWAYS CHECK OHMS WITH THE POWER OFF.

[Mark369]

Re: phillips lcd keeps blowing fuse

Here, I did you a little legwork. Pull the first transformer (L1501) out of the circuit and see if your short is still there by checking ohms across from fuse (both sides) to ground. Here is a schematic of this primary side of your power supply.

do you mean L1601 I don't know where L1501 is.