I have a syncmaster 245bw with no video or backlights on my table right now I checked the mains filter cap and it had 384v is that the norm for these monitors?? At the bridge Rectifier dc side i have 142v.
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Last edited by buggypartsplus; 08-06-2011, 08:04 AM. -
Re: Samsung Syncmaster 945bw High Voltage Question
384 volts sounds correct. That would indicate the PFC circuit is active. There are several other Samsung 945BW threads here; one of them has a schematic for the power supply.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
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Hi Folks
I'm looking for a extreme high current short killer solution for a reasonable cost.
I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a...10-15-2024, 10:13 AM -
Hi folks,
I'm new here and was wondering whether you might be kind enough to give me some advice on troubleshooting the following problem:
Quite a few years ago now, a couple of years from new, my Samsung Syncmaster 740BF LCD monitor starting playing up by making a buzzing noise and then the display would go blank. I seem to remember the blue power led would also go off when this happened but that I'm not 100% sure of. By pressing the power button I do remember I could at first get it working again but eventually the problem would come back. At the time I had read about... -
Greetings to all, I hope you are well.
I consult you because I have a problem with this power source.
The TV when it is connected to the electrical power turns on the blue light but does not give an image. the source is heard a hum.
When I disconnect the power from the TV plates and power it up by itself, the hum goes away.
I have the STB voltages of 5vdc. The microcontroller is powered with said voltage and the main board LED lights up.
but not the 12v or 17v ones, nor the 300vdc high voltage voltages, nor the VS or VA....06-20-2023, 04:30 AM -
Hi all.
Half backlight work fine. 12v in 1 led strip, 2 led strip 178v DC. Two of them are new, 2 led strip blow up .
Main board bn9649462A. What can be? Same one have this problem too? Anyone have the schematics? Thanks in advance. Regards...
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