 |
|
| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
|
|
LinkBack | Thread Tools | Display Modes |
|
#1
|
|||
|
|||
LM7812 semiconductor has zero volts in but still measures 12.12 volts out?
This LM7812 is in a TV power supply without any raster or sound.
When I power on and test the voltage input at pin 1 I measure no voltage there but on checking pin 2 (output) I get 12.12volts. My question is: how can that be? where is the voltage coming from when the input is not there? Thanks to anyone who might be able to eplain this one. AliT |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Zenith Model SY3288DT 32" TV WILL NOT TURN ON | Electronics Repair | |||
Threaded Mode
