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Search: Posts Made By: Yaaman
Forum: Troubleshooting Computer Displays 02-03-2014, 12:57 AM
Replies: 11
Views: 8,723
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 02-02-2014, 02:26 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 02-02-2014, 09:17 AM
Replies: 108
Views: 32,225
Posted By Yaaman
Forum: Troubleshooting Computer Displays 02-02-2014, 08:34 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 02-02-2014, 05:45 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-31-2014, 06:52 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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 ;)
Forum: Troubleshooting Computer Displays 01-31-2014, 05:09 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-30-2014, 03:09 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-30-2014, 03:05 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-30-2014, 02:15 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-30-2014, 02:11 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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!...
Forum: Troubleshooting Computer Displays 01-30-2014, 02:02 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Yes. It's brand new and it's 22nF 630V.
Forum: Troubleshooting Computer Displays 01-30-2014, 01:48 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 01-19-2014, 12:16 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 01-19-2014, 06:41 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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...
Forum: Troubleshooting Computer Displays 01-19-2014, 04:51 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-18-2014, 03:15 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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. :bash:

I go to...
Forum: Troubleshooting Computer Displays 01-18-2014, 02:55 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-18-2014, 01:59 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

I lifted the jumper. Still cant see 24V.
Forum: Troubleshooting Computer Displays 01-18-2014, 01:44 PM
Replies: 108
Views: 32,225
Posted By Yaaman
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.
Forum: Troubleshooting Computer Displays 01-18-2014, 01:40 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

I powered it uup with this large resistor I had. Unfortunately nothing changed.
I checked voltage on this large blue cap. Should it fluctuate from 300V to 330V-ish? Up and down all the time.
Same...
Forum: Troubleshooting Computer Displays 01-18-2014, 12:59 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Good shot. I didn't find it because it is not in caps category. Thanks.
Hopefully I won't need it and the new RT852 will sort it out.
Forum: Troubleshooting Computer Displays 01-18-2014, 12:38 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Closest value I'got at home is 1.4R 5W. Do you think it would be ok just for tests?
Forum: Troubleshooting Computer Displays 01-18-2014, 12:26 PM
Replies: 108
Views: 32,225
Posted By Yaaman
Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Oh yes, the power resistor is blown. That was the very first component I checked but I can swear it was good. Strange... ok I'll replace it and I'll report.
Oh yes RT852 shows 168R.
Forum: Troubleshooting Computer Displays 01-18-2014, 11:40 AM
Replies: 108
Views: 32,225
Posted By Yaaman
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