Re: Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

Sorry for letting you wait long. I have been out for long weekend, hopefully today afternoon I can deal a bit with the TV again. I will attach the requested pictures soon.

Re: Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

Hi,

I did some measurement in the CN4 connector. 2,4,6,8 pins are DGN, on 10, 11, 12 pins I can measure 12.48V.
I also checked the pin 1 which has name in the schematic as PIN_1, only few millivolts I can measure which is not stable 1-3.5mV. After connecting the connector to the main board, the voltage on the 10,11,12 (all the three are sorted in the PCB) dropped by 0.02 Volt. So, seems there is no huge load from the main board.

ST_BY : remain close to 0V (actually 18mv) when the...

Re: Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

HI Dannyx,

Thanks a million for your reply.
Before I am starting to measure some voltage in the connector, I want to make clear about some conditions.
Should I connect the main board to the PSU and make the measurement by that way, or, can I do it the main board disconnected status from the PSU as well ?
Also, I just wondering, might I can use the LM7805 linear regulator connected to the 12V VCC and give the ST_BY pin supply if it is necessary. ( Sorry I didn't went deep enough...

Hi Guys,

I have a 40" Technika LED TV (Tesco brand) using the 17IPS20 -R6 PSU. Few days ago the problem started with the TV, no picture, but sound still it had. (I haven't seen this condition my wife told me) so I am not sure the backlight went off, or there was no video as well that time). She tried to power off and on, but after sound also disappeared. The current condition , after connecting the plug to the main, the red standby led flashing 7 times and after going to be off. It didn't try to switch on the backlight, also no electrical sounds coming form any transformers/coils....

Re: Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

Hi Guys,

I have a 40" Technika LED TV (Tesco brand) using the 17IPS20 -R6 PSU. Few days ago the problem started with the TV, no picture, but sound still it has. (I haven't seen this condition my wife told me) so I am not sure the backlight went off, or there was no video as well that time). She tried to power off and on, but after sound also disappeared. The current condition , after connecting the plug to the main, the red standby led flashing 7 times and after going to be off. It didn't try to switch...