Dear colleagues, I want to fix the LG 42PJ350 that burned the C766 330pf / 1Kv capacitor, and the IGBT Q11 (30J124) and Q21 (30F124) all came in from Y SUS . I have changed the three components from two different sources and the situation is the same. At startup, the image is very bright, with lots of red and noise as if it were a weak signal TV. In 20 seconds, the image gradually returns to its correctness, but the radiator on which the Q11 (30F124) lies is extremely warm . It looks like it's all in the area of this transistor and this in max 30-40 seconds. I do not find anything abnormal in the board or the Y drivers. I have no access under the board but I have two voltages of 5V and 17V that are also noted. The Q11 is a 5-smd smd driver that writes 5K and it measures as another. The only thing I can bind to is a yellow sponge between two sheets of plastic under the radiator in question that I threw from the beginning.I read all the posts related to this defect. Any idea is welcome.
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hello.
I have two power amplifiers, both having their IGBT blown on the PSU.
The original mounted IGBT where marked with IRGB20B60PD1PbF and the gate driver is a IR2156STRPBF.
I looked at mouser and digikey and could not find any available IRGB20B60PD1PbF and somehow ended up using a Bourns BIDW20N60T.
I replaced the gate driver, the gate resistor and both IGBT. But as soon power is turned on, both IGBT shorts out completely (gate, emitter, collector) and the fuse on the AC line gets killed.
So I though i missed a capacitor or diode. I removed... -
Dear reader
TL;DR: iPad not turning on, A10 and power IC become (very) warm when attempted to turn on but this power-on cycle has a 'cooldown' period wherein powering on doesn't work, does not take more than 0.5A charge.
I am working on an iPad 7th generation 2197 from >2019 with no / limited charging and no boot issues. It is a refurbished purchase made in 2021. It appears the 'refurbish' company has either done prior motherboard work (all protective component shield layers are gone) or is one of the many trash refurbish companies (little screen adhesive left, component... -
Hello everyone, I have this ups/inverter IGBT 1450VA which was working great until it started showing short circuit on a small lcd screen, I opened it up and started troubleshooting it and indeed I found some fault transistors, I decided to get rid of all of the transistors next to the shorted ones and it worked for some minutes without a problem, but then I heard a relay tripping off, and now it is showing that 2 batteries connected in series have no power at all, and if i disconnect the 24dc in then the battery are showing they are full (28vdc) with another inverter, they are working great no...
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Hi everyone,
got an Acer Helios 500 Laptop (PH517-51) for diagnosing with a strange issue:
The laptop runs for a while (1-2 hours, sometimes less) and then suddenly shuts completely off, like someone pulled the power cord and restarts immediately after on its own.
If this happened once, then the laptop only runs for a few minutes until restart.
This happens regardless while staying in windows or uefi or in a linux environment.
At first I thought of a normal overheating issue, but as I monitored temps with HWInfo64, nothing seems very hot.
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A1502 - 820-4924-A - light green and then orange without battery - Not turning on - CPU warm,3 beepsA1502 820-4924-A, e, no liquid, stop working suddenly. Yesterday, I've plugged magesafe, light green and then orange without battery,3 beeps, not turning on, CPU warm and at some point fan was spining but nothin on screen, .. no chemie.