The 8-pin chips on the bottom side are Dual MOSFET's
"244.6 ohms
439.8k
0.1 ohms
5.4 ohms"
Are these the resistance reading that I asked to check by leave one probe on any one of the pins on the right side of the chip (pins on the right are connected together) as shown in my redlined picture, then another probe on each pin top read the resistance? If that's the case, then you have bad chip (shorted).
Can you read the numbers on them?
yes that is correct i thought one may be faulty given them readings. cant make it out clearly but my wife said it looks to her like etstm 8309.if i disconnect and remove the shorted one should the other one then work?
Probably, but need both to work to get the Monitor back on,Part Code is a new one on me, perhaps budm may have some idea //You could try finding something like it on the Alldatasheet webpage
They are dual MOSFET's setup as bridge drive so you will need both chips, there should be more than one lines on the chip, you may have to wet it to read the numbers.
wow you guys are awesome thank you very much for all your help so far. I will do a bit more work on this board and report back with the results.
Once again thank you very much for all your help you are all very kind.
I have brought up this thread because i have the same board but 2 secs to black, board recapped, mosfets all ok no shorts,all transformer solder joints reworked as well as a few others which looked suspect, i would like the schematic if at all possible my board is out of a 2233BW (LS22CMKKFV/EN), by the way there are 2 caps the wrong way round
C113 and C116.
I have read these posts about the Samsung 2253bw and hope some one can assist.
I have this monitor, and someone has started a repair - removed the caps, and I need to know which one is which for the locations shown as C301 & C302, C108, C113, C116, C112.
I have read these posts about the Samsung 2253bw and hope some one can assist.
I have this monitor, and someone has started a repair - removed the caps, and I need to know which one is which for the locations shown as C301 & C302, C108, C113, C116, C112.
What was the model and revision of that IP board? If its IP-49135B then these should be the usual values...
For C301, C302, C108 & C112 => 820uF 25V 105C
For C113 & C116 => 1000uF 16V
Markings may vary for different versions of the same board model. Trace the rails, anything that goes to the inverter side, usually +13V or more, should be using 25Vdc rated capacitors. For the other rail, usually +5V one, should be 16Vdc rated capacitors...
Generally for 820uF capacitors on the supply rail, I always never use the original values but rather replace them with 1000uF which have lower ESR, lasts longer (despite aging) and much cheaper (yes, believe it or not... those 1000uF are actually cheaper than 820uF ones!).
Hello, I have this invertor board IP-49135B.
At first, the monitor shut down suddently.
After opening it I found 4 bad caps. After replacing all caps, still nothing. I checked U202, U203, both shortened. I replaced them and now the monitor displays image for 2 seconds, after that it goes dark again.
It seems there is a problem with the OVP circuit.
Can you please tell me the values for R241, R214 and C207?
I have marked them on the image, in case i misread them.
On my board R241 is showing overheat marks and i can't read it. I measured it and it looks like 330K, which i don't think is good.
Also, c207 has a strange color, it looks more like an inductor then a cap, but on the board it is c207.
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