Re: LG 47LM4600 Blown TCON fuse and Main Board Transistor
Thanks.. this helps a lot.. i'll look into the footprint of the SL22
Thanks.. this helps a lot.. i'll look into the footprint of the SL22
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Re: LG 47LM4600 Blown TCON fuse and Main Board Transistor
Just reporting back - Replacement of the FET on the main board went well. Tested the TCON board outside the set with an external power supply (12 V) and current-limited shows a short on the board after replacing the fuse and both Diodes. Though the cap on the output didn't test "short" on the board and passed ESR test, upon applying voltage across it, it goes to almost short. Replacing the cap with a 25V 4.7uF did the trick.
TV is up and running - Thank you budm for the helpAttached FilesComment
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Samsung UN55ES7003
made house call.
red power led comes on, blinks twice, no display, no backlight, relay clicks, repeat.
psu has self test feature.
disconnected from mainboard.
determined PSU ok BL ok.
suspect mainboard.
disconnecting tcon has no change on operation.
markings on mainboard:
BN97-06531P 0151
BN94-06123R
found and ordered replacement on ebay https://www.ebay.com/itm/394077328633
for 54$
second house call:
with replacement mainboard, tv turns on, has sound,... -
I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.
Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in.... -
HP Modelnumber: 14-dh0061nb
This laptop had a shorted cap on a Vcore section. After replacement is works again. But there is still a battery issue.
The battery is HT03XL and with the built-in component test from HP, in the Power section, I get an error: Logic State: Calibration required (20), Charge state: Blown Fuse (42)
I have another same battery, also with error: Logic State: Very Weak (70), Charge state: Blown Fuse (42)
And a third battery TF03XL (looks identical) with error: Logic State: OK (0), Charge state: Blown Fuse (42)
All these 3 batteries are charging... -
I gotten a Carver CM-1090 amplifier from a friend who has kept it in storage for decades. Opened it up, thick layer of dust cumulated everywhere. Vacuumed it semi-cleaned, and blown off as much as possible the remaining dust. This is a 220V version.
On initial powered up with nothing connected - it works with all the lights and button indicator lit up as pressed, etc. I then powered off, connected a CD player into the CD RCA input and powered it on. It seemed to work for a short while and when I turned the volume up and down to see the the VUs works, the power started to clicked off... -
I found a blown transistor (q24) in the picture. I replaced it, and it blew again 🤔
If I measure the Voltage while turned on without the transistor on the pads, it is 10V, 3.3V, 0V The resistance if turned on: High, High, 0.
Anny idea how I could proceed?
Regards
Mawa...
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