Need help identifying IC (BD5F17) from KDS 700P monitor.

[Welchs101]

I have a KDS 700P monitor which does not work. I opened it up and found two burned areas on the power supply board (see enclosed pic).

In the areas that are burned i see this chip. But i cant seem to find a datasheet for this chip. I have included a pic of the chip.

any help you can provide would be appreciated.

[ecking767]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

I have a KDS 700P monitor which does not work. I opened it up and found two burned areas on the power supply board (see enclosed pic).

In the areas that are burned i see this chip. But i cant seem to find a datasheet for this chip. I have included a pic of the chip.

any help you can provide would be appreciated.

That's an easy one ! AO4606
https://cdn.badcaps-static.com/pdfs/...c6e472ae00.pdf

The AO4620 is the replacement for AO4606. You can still buy the AO4606 from from Ebay but not from Digikey.

ecking767

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

thanks!!!!!! How did you know the part number is AO4606? I was stumped....could not figure it out. I thought the 2nd number was the part number.

Thanks.

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

Another quick question.........

Can you tell from the data sheet if D2 and D1 are shorted? When i take a meter and measure the resistance from D1 to D2 i get a short.......but i am not sure if this is how it is supposed to be or not?

[ecking767]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

thanks!!!!!! How did you know the part number is AO4606? I was stumped....could not figure it out. I thought the 2nd number was the part number.

Thanks.

Well search using wildcard *4606 and that other website

http://www.alldatasheet.com/

Have a better search engine then

http://www.datasheetcatalog.com/

Either way you should be able to get some anwser

Another quick question.........

Can you tell from the data sheet if D2 and D1 are shorted? When i take a meter and measure the resistance from D1 to D2 i get a short.......but i am not sure if this is how it is supposed to be or not?

internally no that are not connected. on the board yes that OK.
Measure from the gate to drain, and source to drain to see if shorted

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

Thanks!

I checked between gate and drain, source and drain........not a short. So i guess its ok. I also measured the diode as shown in the data sheet. So i guess the chips are ok.

SO this leads me to ask the question........what could have caused the "burnt" spots on the pcb board.

Could it be the transformer?

Measuring the primary side of the transformer. There appear to be 6 pins on what i would call the primary side. ALL 6 pins are shorted..........is this NORMAL?

[sofTest]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

SO this leads me to ask the question........what could have caused the "burnt" spots on the pcb board.

Bad solder joints on the transformer legs? Try re-flowing them.

Could it be the transformer?

I think you would need a ring tester to test a transformer.

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

You really think the burnt spots are just due to bad solder joints? Ok....i will reflow them. Thanks. Have you seen this before?

I found this article on how to test transformers (see link below).

http://ezinearticles.com/?Testing-a-...ormer&id=56803

In the article there is a statement about using a simple 60watt bulb........anyone ever done this?


************************
"If you do not wish to invest on this tester you may use a light bulb to check it. Remove one of the

primary winding pin and connect a 60 watt light bulb. One end to the circuit while the other to the

transformer pin. If the bulb light and didn't goes off suspect a shorted winding and if the light goes off,

the winding is ok."
************************

[sofTest]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

You really think the burnt spots are just due to bad solder joints? Ok....i will reflow them. Thanks. Have you seen this before?

On some HP, where bad solder points on the transformers is common, the discolouration of the board is also common. Usually not as bad as on yours, but still...

Anyway, I wouldn't start with suspecting the transformers. It isn't often they go bad, and if they do go, not both at the same time.

I would have started with the usual suspects; caps. What are the symptoms? Is this one of the "see the picture on the screen with a flash light"s?

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

a friend brought it to me........they had tried to work on it......replacing a few caps..........

Right now, when i power it up.......nothing. No LED light........nothing. I checked fuse ...its ok. So i will have to look a little deeper.

I did reflow the transformer connections. Thanks.

Quick question: Should ALL of the inputs on the primary side be shorted? Because they are.........just curuious.

thanks again.

[sofTest]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

a friend brought it to me........they had tried to work on it......replacing a few caps..........

Right now, when i power it up.......nothing. No LED light........nothing. I checked fuse ...its ok. So i will have to look a little deeper.

So, what kind of caps did they use? Doesn't look like anything we usually recommend. Also, start looking for damages they might have done (broken traces, damaged solder pads etc.). Some boards are so delicate, that even a to hot iron do damages.

ALL of the inputs on the primary side be shorted? Because they are.........just curuious.

On the board, impossible to say without tracing out the board or schematics. There is a lot of jumpers in the area, so it's not improbable. Others here are more qualified than me. I simply checks out everything else, before I look at the transformer. Only fond one bad one, and on that one, the thermal protection had triggered.

[ecking767]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

Right now, when i power it up.......nothing. No LED light........nothing. I checked fuse ...its ok. So i will have to look a little deeper.

Start by checking the power supply out voltage.
Are you getting a steady +5VDC and +14vdc?

About the dark spot on the top side of the board. This is normal heat burn mark from the four AO4606 and not from the transformer.

Also check for shorts across the power supply.

[PlainBill]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

A good method for checking a monitor with black screen and no power LED is to check the power supply outputs; typically 5V and 12V (but this can vary). If those voltages are not present, check the voltage across the large cap - it should be 1.4 x the input voltage (call it 165V in the USA). If it is missing, check the fuse, etc. If the 165V is present, suspect the caps around the SMPS IC, or the SMPS controlelr itself.

If you have 5V and 12V, check the logic board. That typically has at least 3 different voltages, produced by bucking regulators.

If you have 5V, 12V, and the power LED comes on when appropriate, check the voltage to the inverter, and the control line turning on the backlights (BL_ON).

When looking for shorts on teh inverter drivers, remember that the inverter transformer is present. It is usually capacitively coupled.

PlainBill

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

thanks guys.......i will try and check all that you said. I will get back to you with the results. thanks again.

[Welchs101]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

Well, IT WORKS!

Using what you guys said i started probing around. I started with the voltage across the big filter cap......then I discovered that my friend had not replaced ALL the caps that he said he had. I found one cap "near" the big filter cap which was "bad". I replaced this cap. I looked at a few other caps which were not replaced. They were the SAMXON brand which i remember reading on here that these were "bad" so i replaced the other caps as well. Good thing i did since after i removed the caps i measured them using my cap meter on my fluke........they were not 100% bad probably getting close.

I replaced all the caps on the board with new ones.........plugged everything back in and the monitor WORKED!!!!!!!!!

Thanks guys and thanks BAd-caps forum. You guys rock.

[chomot]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

I know this is an old thread but I figured since there is good advice here on the 700P I should see if my problem will add to it.

I have a 700P that powers up fine. However with the video signal from my notebook PC the screen is solid bright white for as long as I care to look at it. None of the buttons on the bottom work except the power on and off. The rest of the buttons produce no set up or adjustment windows and I can see no video from my PC at all.

I am thinking the power supply card is fine but the video processor board is acting up. I see no obvious issues visually.

Does anyone know of any issues with these. I have fixed a lot of monitors by replacing the caps on the PS card but this will be my first with processor card issues.

Thanks

[PlainBill]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

I know this is an old thread but I figured since there is good advice here on the 700P I should see if my problem will add to it.

I have a 700P that powers up fine. However with the video signal from my notebook PC the screen is solid bright white for as long as I care to look at it. None of the buttons on the bottom work except the power on and off. The rest of the buttons produce no set up or adjustment windows and I can see no video from my PC at all.

I am thinking the power supply card is fine but the video processor board is acting up. I see no obvious issues visually.

Does anyone know of any issues with these. I have fixed a lot of monitors by replacing the caps on the PS card but this will be my first with processor card issues.

Thanks

Probably NOT a processor card (signal card) issue, but rather a panel board problem (the long narrow board that the output cable of the signal card connects to). Sometimes the cable from the signal card is not properly seated in the connector on the panel card, sometimes a fuse on the panel card is blown.

PlainBill

[chomot]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

I looked into the fuse and connector advise and could not find any issues. The LED for the power button is green when I test it so I am stumped.

I am not an electronics wiz, for this issue I am more of a one trick poney. I have fixed about a doz monitors now with only the knowledge of replacing the PS caps and have had good luck with this as I have always found the bulged caps every time I opened one up.

Anyway this one has the good brand of Samxon for all but the big guy and that is a KM(M) but they rarly go bad from what I know. I guess I will replace the four 1000uf x 25v, two 470uf x 25v and the one 220uf x 25v and see where that takes me. If that does not work I will ask if anyone wants a monitor for parts or repair as I will be outa my leage.

Thanks for the help, I did add a few pics of the board in case you can see something I do not.

[PlainBill]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

I looked into the fuse and connector advise and could not find any issues. The LED for the power button is green when I test it so I am stumped.

I am not an electronics wiz, for this issue I am more of a one trick poney. I have fixed about a doz monitors now with only the knowledge of replacing the PS caps and have had good luck with this as I have always found the bulged caps every time I opened one up.

Anyway this one has the good brand of Samxon for all but the big guy and that is a KM(M) but they rarly go bad from what I know. I guess I will replace the four 1000uf x 25v, two 470uf x 25v and the one 220uf x 25v and see where that takes me. If that does not work I will ask if anyone wants a monitor for parts or repair as I will be outa my leage.

Thanks for the help, I did add a few pics of the board in case you can see something I do not.

What I am seeing is someone who is not listening. By your description, the problems is NOT the power supply, it is not the signal card, it is the LCD panel card. Post a picture of the back of the LCD panel, or stop wasting my time.

PlainBill

[chomot]

Re: Need help identifying IC (BD5F17) from KDS 700P monitor.

Sorry for the long lead, I am have some time now to get back to this. Also sorry for not mentioning that I did look at the panal when you brought it up, I should have said so but I forgot since I did not see anything about it. All it is is four buttons and an LED. I did attach photos of the front and back of it.

Since I am a one trick pony on these I orderd a set of caps and replaced them hoping for the best. It did not work out, still have the same issue. The monitor is full bright all day long. It will since the presence of a video signal when I switch the note book PC I use for testing from onboard LCD to external and back but that is all it does other than make a nice large square desk light. The only button that works is the power and all the others do not give me any menu nothing.

I was looking at the signal board wich I also included a photo of and doing some searches on it but I could not find any silver bullet type fix for it.

Thanks for the help and sorry for taking so long and the incomplete info.