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Simply doing the habit of reading pwm /control IC datasheets there are always a list of protections with acronyms like OVP (over voltage protection) , OCP (over current protection), SCP (short circuit protection), UVLO (under voltage lock out) and these are achieved with feedback loop (V too high, V too low) and compared / balanced with Mosfet current via Current sense pin input on primary, when there is high current on mosfet and low V on output the alarm bell rings and pwm stops until the next IC start (remove - reinsert power).. this is poor theory, i'm not the expert of psu designs, never been lucky of finding broken tv with bad PS..Comment
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Update time! So the only diodes I could get quickly were 20A versions, and a quick suggests this is OK to do. So I ordered those, whacked them in and the TV works! I'm going to run it for a while to make sure it stays happy, but so far so good.
Also, I missed disconnecting the ribbon cable that goes to the IR receiver, and damaged the end of the cable, breaking a trace. I cut off the broken bit, and was carefully able to shave the ribbon cable's top layer and expose the traces again. All 100% now.
Thanks everyone for your input.
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Well, that’s good, as I expected, replace these two diodes and everything will work.Comment
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Hi,
I've got a Sony KD-49XE8396 TV that will switch on show the Sony logo then the Android logo and then switches off, and then blinks red 6 times.
I've read that this is the backlight, and during it showing the initial logos I can see that the left side is definitely darker.
I've also read that you can bypass the error to get it working but I'd prefer to fix it if at all possible. Any help would be appreciated.
Many Thanks in advance. -
Buenas mi nombre es carlos me uni al foro porque estoy buscando el schematic de una sony vaio pcg-41217u otras formas de escribirlo son 1p-0117j01-a012 mbx-237 numero de placa revision 1.2 o Sony VPCSB (MBX-237), en fin me gustaria y ayudaria un monton si alguien me puede dar dichi svhematic para hacer las mediciones de una laptop de la mencionada anteriormente(Sony VAIO PCG-41217U) con el fin de repararla dejo de funcionar solo prende el led de la bateria al pulsar el boton de power el disco empiesa a hacer ruido de actividad pero los leds del frontas no reflejan acividad y no enciende la pantalla.... -
Hi
Ive got a vintage 2001 sony trinitron flat tube tv
The image is slightly bowed and the left and right sides about 1-2in has fluctuating discoloration that comes and goes if i move or hit tv on sides
See many images attached...
Just windering if this is not fixable or something i can correct without getting too invloved
Im trying to sell the tv
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I have here a Magnum IA.100 which belongs to my parents.
The unit powers on & when the relay kicks in, you get a pop from the speakers (this might sound weird but is usual behavior for this amp). However, you get nothing coming through it from any of the inputs & no pops and crackls from any of the controls.
Because of the sound from the speaker when the amp turns on I have assumed that the output section probably works but I could be wrong & I'm not sure how to test that side of things further.
What Ive done........01-01-2025, 01:26 PM -
Diagnosed this TV as having a failed main board which I've replaced with one from a KDL 55HX850. They are (supposedly) the same board.
Being 'Smart TV' it requires a firmware reboot when you swap out boards such as T-Con or main board. It starts with a black screen and flashing yellow and green LEDS, indicating it needs that firmware boot. The procedure described all over the web is to put the software into the root directory of a FAT32 formatted USB drive and it should load that up once plugged into USB1 port. But not for me. I can see the LED on the USB chip flash for about...
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