I have a Dell monitor with backlight problem. It uses a pair of BE341V transistors. I have not been able to find any information. I think one of them is bad. See picture attached.
Looking for information on BE341V transistor
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by pavithra_ukI received two GW Insteak GOS-622G 20Mhz Analog CRT oscilloscopes to repair. both have shorted transistors and fried resistors in Y plate drive circuit.
since both have same issue, I want to find if this common issue with this scope or any other cause. here I attached schematic of Y output circuit.
C2570 Transistor. this is Gigahertz range low power transistor (VCBO-25V, VCEO-12V, 50mA) for use in VHF/UHF range. but, that transistor here in the circuit of 160V supply. both scopes have both this transistor fried.
Transistors with heatsink - 2SB648A,...08-26-2022, 07:02 AM -
by Brendon@aaHi, pretty new to repair and have an OLD benchtop DC power supply with no output. There is no voltage showing on the volt meter display however the current meter is full scale at 5a when on the 2a limit setting and 1.35a when on the 500ma setting.
230V AC is making it past the fuse and into the main transformer - a yellow pair on the secondary has 30VAC on it, Brown pair 37V, there is what I think is a centre tap coming from the main transformer in green that has 15V and 20V respectively from the yellow and brown windings.
From there the power dives into what looks like a control...3 Photos -
by NevilletHi All,
I have a Denon PM34 HiFi amplifier that presented with no output on the right channel.
On examination the main drive Darlington transistor pair was faulty together with a smaller NPN driving them.
I've obtained the matching transistors but have not soldered them in place and would like some advise before I do:
The faulty componants are:
Q762 2SD1894 Darlington NPN
Q764 2SB1254 Darlington PNP
Q752 2SC3419 NPN
My question is why did they blow in the first place and are there any componants I should...-
Channel: Troubleshooting Audio Equipment
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by ohrenHello!
I'm looking at an original Xbox PSU: Foxlink ftps-0002 rev. B. The 12 V output is too low, and the 5 V output is too (?) high. Unfortunately I don't have an oscilloscope but only a DMM for diagnosis.
Measured voltages with no load:
After rectifier diodes
12V: 6.17 V
5V: 5.67 V
Secondary transformer pins AC measurement (really don't know if this says anything)
12V: 2-2.5 V
5V: 1.04 V
I also have another (working) Xbox psu from Delta. The same measures there, in order, being: 10.79,... -
by mikey5791Hi all forum members,
Fyi, i have been working on this old model PCT-4082 (4 channel car amplifier). The owner said only one channel is working.
My initial finding is this amp originally use Toshiba 2SA1943 and 2SC5200 transistor for its output but after opening the top casing i found it used Toshiba A1941 (pnp)and C5198(npn). I desoldered all the 4 pairs transistors and found 1 piece A1941 open(tested "OL" on all legs) and replaced the 1st pair with 2SA1943 and 2SC5200, thats why you can see in the picture it is the bigger size transistor. The other A1941 and C5198 all...-
Channel: Troubleshooting Audio Equipment
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