Asus MK241H no power

[budm]

Re: Asus MK241H no power

Here is the chart:
http://www.westfloridacomponents.com...tor-sizes.html

[tibimakai]

Re: Asus MK241H no power

Thank you for that chart. So it looks like I have the right resistors?

[budm]

Re: Asus MK241H no power

They seem to be the 805 based on your measured dimensions, I did not look at your links.

[ashok parmar]

Re: Asus MK241H no power

Found these two resistors suspect to me. The previuos owner mentioned about a pop before all went south.

dear friends

resistor location127=200k
" " 124=1k
" " 181=12k

[tibimakai]

Re: Asus MK241H no power

Thank you for that. You don't have by any chance a picture with these resistor values?

[ashok parmar]

Re: Asus MK241H no power

i want servicemanual for that same model

[budm]

Re: Asus MK241H no power

@ashok pamar: That one valure of 200K does not sound right, can we see the pictures of those resistors just to be sure?

[tibimakai]

Re: Asus MK241H no power

Not sure if anybody has one. I have searched for it but I came up empty.
From where did you get those values since you are looking for a service manual? Do you have the same monitor?
Please if you do, could you take a picture with these resistors, I would like to order the resistors before the IC comes from China.

[budm]

Re: Asus MK241H no power

@tibimakai, I am wondering the same thing on how he gets the values of those resistors if he does not have the service manual, we need to see the pictures of those resistors to verify.

[tibimakai]

Re: Asus MK241H no power

Lately I'm fixing monitors and I have more problems fixing these then TVs.
Now I'm working on a Samsung 245B and everything seems good at least to the point that I have reached checking.
I thought that it will be an easy fix, the 3x68 OHM resistors and it will run, but not.
Capacitors read OK too(18nf, 82uf, 10uf, 47uf).
I guess I will stay away from monitors, it's way to much time goes into fixing them and I don't make enough money. These two monitors I'm planning to keep for myself, otherwise I would have trashed them. One will be on one workbench and the other one the other workbench, with mounts from monoprice.
http://www.monoprice.com/products/pr...seq=1&format=2

Tibor Makai

[tibimakai]

Re: Asus MK241H no power

Budm, I have received the ICs (got two of them). Do you think that I should go ahead and order the ones we agreed on?

[budm]

Re: Asus MK241H no power

You mean the resistor? You may also what the other person said what they are also since they are cheap.

[cadiman]

Re: Asus MK241H no power

I have received many tvs that had the power supplies recapped only to find bad diodes.

Also anytime you are working with smaller moniters some use a 12 vdc transformer and that is normally the issue and not the smaller moniter.

Just a thought.

[tibimakai]

Re: Asus MK241H no power

I'm not coming back with good news.
I have replaced the IC, the three resistors and still a no go.
I'm getting on pin:
#1 1.78V #5 0.04V
#2 0,00V #6 0.25V
#3 0.00V #7 0.012V
#4 0.00V #8 143.5V
The pin 1 oscillates slightly.
I don't have writen down the R103, but it was 9.xx Kohm.

[tibimakai]

Re: Asus MK241H no power

Any more ideas?

[tibimakai]

Re: Asus MK241H no power

Need some help here, please.

[tibimakai]

Re: Asus MK241H no power

What value should I have at pin#8?
Found this:
http://www.go-gddq.com/upload/2011-0...0610397797.jpg

[budm]

Re: Asus MK241H no power

About the same as DC voltage reading at the main DC filter cap (450V cap), pin8 Drain is used for start up.

[tibimakai]

Re: Asus MK241H no power

So should I have 400V at pin#8?

[HF Specialist]

Re: Asus MK241H no power

Howdy, Don't know if you're still interested, but here are resistor values you were looking for: R124 1k (102), R137 5.1 (5R1), R181 12k (123). R172 is, I believe 0.1 ohm (brn,blk,silv) 1 or 2 watt. Q101, TEA1530 along with above resistors fixed mine. Good luck! BTW, had to scrape away some charring between the pads of a couple resistors.