Re: Problems with Samsung 740N monitors

Hi.
I replaced 4502C by 4606 ICs. The monitor doesn't flash but the CCFL still off. The voltage on 13V pin = 17.4V and 5V in Vcc pin of BLT3195G IC now. What's the matter here? Where do I can checking now?

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Re: Problems with Samsung 740N monitors



Thanks for your prompt reply. I checked 4502C as your instruction. S2-D2 = 0.5 Ohm. So I removed that ICs (both of them). Now I'm wating the new IC from supplier. I purchased this morning. Hope the problem will fix in this time.
I'll return and notice the result to you....

Re: Problems with Samsung 740N monitors

I checked CCFL already, it's working fine. Problem on Inverter board but I don't know where? (may be 4502C IC died but I don't know how can I check it). I just heard a low noise of inverter board but I don't know it's normal or not.
Some pictures I just taken after I cleaned resin on the board.
Looking for answer. Thanks!
Sorry for my English....

Re: Problems with Samsung 740N monitors



Thank for your answer. I will check CCFL bulbs as budm's method (I don't have any spare bulb). If it fine. I will cleaning flux on the board and take a good picture to show you. 0.am right now in my location righ now, so I can't do it. I will doing on tomorrow....

Re: Problems with Samsung 740N monitors

Hi, Thank for all reply.
I just uploaded some pictures of the board.
R of transformer = 1.3k (both of them)
Look forward to hearing from......

Re: Problems with Samsung 740N monitors

I replaced 3 caps 820u by 2x1000u + 1x470u and 3A pico fuse by a small copper wire (I cannot found it in my location). My monitor don't working. Power led on but it off every 3 second, the panel flash after power led off (off time about 0.5 second). I check the board but it in good condition (I think may be 4502C burned but it look good). The voltage on 13V pin oscilated from 14.5-18.3V, in on/off pin about 0.3-2.5V. Oscilating same with power led ligh time. No picture on display. I remove fuse (copper wire) and check again. The power led...