having trouble identifying this problem, it doesnt do it when the tv has a blue no signal screen, only when the signal is connected to the back. already checked tab bonding
Attached Files
is another ones treasure-
I just acquired this portable aircon, history unknown. Its behaviour is quite strange:
- When turned on and placed into cooling mode, the upper fan (cold air out) just spins slowly. The compressor and lower fan do not run.
- If the device is then placed into heating mode and then back into cooling mode, the lower fan and compressor kick in and start cooling, but the upper fan still only spins slowly.
- If the device is placed into fan-only mode, the upper fan does not respond to low/medium/high speed toggles - just keeps running slowly.
- Display and buttons all behave normally aside from the
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Hello, I would appreciate your expertise on this. I have about 5 years experience with copier repair, so I have done a lot of board and component replacement. This is the first LCD TV I tried to repair, and it really humbled me. The issue was that on power on the TV power light would go on and then fade out seconds later, and there was no image at all, screen stayed black.
I thought this meant there was a power board problem, not realizing that the power light fading out was by design, probably so the light would not distract the TV watcher. This is not my TV, so I wasn't familiar... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hello everyone
I attach a schematic and teardown photos for the DoCreate DHJ567 handheld spot welder. I bought this welder for temporary use while my supercapacitor welder was waiting for replacement parts. It cost only £24, though there is a screenless version available for £17.
Performance: The absolute maximum it can handle appears to be 0.15mm of pure nickel. Reliability was not great - welds were very inconsistent, ranging from weak attachment to burning through the strip. However, I was able to build a 5S2P pack without losing any cells. It's a bit difficult getting... -
Hi
i have a a2179 which is locked. On the other hand I have an unlock t2chip(just the upper layer of ic)I wanna know if I can just change the upper layer of the t2 chip.
any way does anyone know what each layer do?08-03-2024, 01:46 AM