Re: Samsung 2493HM - Power button blinking: BN44-00195A & BN41-00962A
I am trying to fix a monitor with exactly same fault. In may case I had to replace to fets QM802/803 and power resistor RM801, zeners DZM802/3/4/5. Then DZT851/2, RT852 and QT851 as well as all electrolytic capacitors and the board still generates a fault.
Good luck.
Yaaman
Member
Last Activity: 02-16-2015, 05:13 PM
Joined: 01-06-2014
Location: Twickenham
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Ok. I keep working. I've got all 24V and 5.3V now. I thought I swapped the zeners in 24V-to-5.3V section but I didn't. Anyway this part is now fixed.
I still need to find out why this power supply randomly making my "trick bulb" to light.
With video board connected test bulb always comes on. When I use 2k resistor the bulb comes on only sometimes. I really don't even want to think that the logic board is fried. I prefer to think it is because of the load.
Could it be because I used...Last edited by Yaaman; 02-02-2014, 04:25 PM.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Yes of course....Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
It doesn't look good. I've got more than one issue.
I removed solder from pins 12 and 14 of ICM801 - MC33067. With logic board connected test bulb is coming on randomly. But when I use 2k resistor and I start the power supply board with it the test bulb never comes on.
I don't think the video board is bad as I have short circuit behind the J830 jumper (on the picture). When I reconnect the jumper I can see sparks and board dies.
I need your help guys....Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I've just connected everything together and unfortunately it's not working. Test bulb comes on and after 2s is pulsing quickly.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
It is good old style 100W incandescent bulb which is now banned in bloody EU. Fortunately I found some on eBay
Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Hi selldoor
Not I didn't. I'll try after work. But that in my opinion doesn't explain such a randomness.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
When I say the bulb i refer to "in series bulb trick" bulb. Inverter is not even connected so I didn't mean ccfl. LED is the led on the front panel.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I had 24V jumper lifted. When I soldered it back on the 24V gone. Now I need to switch off/on many times more to get the bulb come off, and event then I have no 24V.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Then the bulb comes on and pulsing the 24V slowly coming down, 1V every 2s.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Ok that's weird one. When I let it cool down for a few minutes, after first power up the bulb comes on, then power off and on and the bulb only flash once and stays off and I have the 24V!
Unfortunately only until next power off/on. Then the bulb comes and stays on until I let the system cool down again.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Yes. It's brand new and it's 22nF 630V.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Hello
I finally received all replacement parts. I also used the lamp in series trick. Looks like it saved me a lots of trouble.
When I switch power on bulb comes on then after 2-3 seconds starts pulsing at almost full brightness. When I touch on/off button led comes down as well as the bulb. Stand-by is working, that for sure
I've no idea what's wrong. Could it be MC33067 (ICM801)?Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Yes I read about lamp trick, I'll try it. The heatsink is missing because 24V jumper I lifted was underneath.
I am away from my pc so I don't know the zener values but I've got schematic and I go by it.
Every part I order now is always more than I need so I have a spare.
First FETs I ordered were exacly the same but now I'm thinking to get replacement as per Fairchild Semicon the original are not being made.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I'm doing a shopping list. What else possibly could blown? I'm ordering some parts from Farnell so I can get everything in one go. I'll get the zeners, 100ohm smd resistor (RT852), mains caps, 22nF cap, 0.22ohm resistor. What else?Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I checked CX801S, CX802S and CP802S (circled). I only have multimeter with capacitance test. I read CX801S - 312nf, CX802S - 315nF and CP802S - 480nF. That look fine to me....Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
That was stupid what I've just done. I replaced blue cap with 100nF mkp and power resistor with 1.5R 5W one and powerd up. Resistor blow up loudly and two QM802 and QM802 are dead.
I go to sleep...Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I will order and replace all four BZX84C22 and two LMBD2838LT1G.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
I lifted the jumper. Still cant see 24V.Last edited by Yaaman; 01-18-2014, 04:09 PM.Leave a comment:
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Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.
Sorry I mean read value is 168R
Oryginal value of RM801 is 0.22R 1W....Leave a comment:
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