component identification

[glinjik]

hi all out of interest ive got a blown led panel

q1 what is the round component ? Thermistor?
q2 what value should those wire bound resistors be going to the ridge rectifier?
q3 what is the point of those resistors / thermistors?

[WattsThat]

Resistors of some type, fusible if there is no external fuse. The other round components above and below the resistors are likely capacitors.

Values are depend upon led current and other design considerations which are unknown.

[Jwillis]

Bare disc MOV  and MELF resistors .

[fabiodl]

While the resistors blew, the cause is probably somewhere else. Even if you replaced the resistors, you would probably blow them again. Or did you accidentally short something?

[Jwillis]

Surge protection circuit . Causes of surges can include lightning strikes ; Power outages or blackouts  ( specifically when the power comes back on ) ; High power electrical devices turning off and on like refrigerators , Air conditioners and large motors  ; electrical shorts or faulty wiring ; over loading a single circuit can cause surging into other devices on that same circuit .

[glinjik]

hi thank you for your reply the light was on top of a pile driver machine and was exposed to the elements i noticed some condensation inside the glass before i gently opened the case with a hammer i think it was probably water ingress that caused a short just for experimentation i bridged the resistors and all works but its useless as a LED panel unless in side somewhere