This had been missing 3v line it shows practically a short and this transistor is missing if any one has a reference pcb of one of their own please have a look for me for the symbol on the transistor.
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Missing transistor, only 2 choices:
MMBT3904 or MMBT3906.
you can tell which one exactly by checking the solder pad for pin 2 (emitter), if it goes to GND then it's MMBT3904.Attached Files -
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it read 3.4 kohms on the emitter, just as reference 12v from plug is also the same so they directly correlate so is it MMBT3906 for sure?
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If the emitter solder pad has 3.4k resistance to GND which is the same resistance as the 12V rail to GND then yeah, it must be a PNP transistor.Last edited by прямо; 03-20-2024, 08:14 PM.Comment
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thank you for your help!
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AMD Radeon R9 290 / R9 380 / R9 390
The Radeon R9 290 was a high-end graphics card by AMD, launched on November 5th, 2013. Built on the 28 nm process, and based on the Hawaii graphics processor, in its Hawaii PRO variant, the card supports DirectX 12. This ensures that all modern games will run on Radeon R9 290. The Hawaii graphics processor is a large chip with a die area of 438 mm² and 6,200 million transistors. Unlike the fully unlocked Radeon R9 290X, which uses the same GPU but has all 2816 shaders enabled, AMD has disabled some shading units on the Radeon R9 290 to reach the... -
Hello,
I got a SAPPHIRE NITRO+ RADEON RX 570 4G that has no picture.
I see no dmg on the board.
Fans and RGB are working.
I can see the card on Windows with an other GPU, but with an error in device management.
When I try to install last driver, it freeze.
I've tried to boot on Arch linux to do a meme test, and it freeze at boot.
Here is my resistance measurements :
Vcore seems low. What can I check next ?
Thanks...10-31-2024, 07:08 PM -
Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.
The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.
Original T-con:
Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.
First replacement T-con:
I thought it might be t-con and ordered new t-con from china(supposedly tested)... -
This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.
Problem
TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode... -
Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
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- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered...
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