Re: Advice needed regarding a broken charging circuit on a lappy

remember that PQ49 has RDS on of 13 milliohmn at 20v and is a 12A part, replace with identical or equivalent I used fds4435 which was within the spec of what the circuit required,
btw to last poster this is the fix! lol

Re: Advice needed regarding a broken charging circuit on a lappy

Fix for posted problem PQ49 short circuit gate drain source,
type AO4407 p-type power trench mosfet,
underneath main board,

Re: Ysus_zsus

thanks i will check those capacitors, replaced mosfet on buffer boards, and replaced the IPM y sus module from spare, unit, repairing the older one at a later date, we had a shorted flash chip, unsolder and resoldered,
TV up and running at moment on soak test,
cheers

Re: Ysus_zsus

Thanks for reply me and my colleague have found that one of the IPM modules are bad, removed it from circuit for repair both of the IGBT have popped as well as a 2r2 and shorted T6790 (complementary high gain transistors)
Ive managed to find equivalent IGBT (gb10nb37lz) going to replace them and module should be ready to go, I am not going to buy another board when repairing the module looks straight forward

Have anyone got the schematics for any of these especially for the LG,I know that LG do not supply them but I have heard That someone has one directly from lg Technician, (Can not remember his name)
Tv set is 50px4d-eb.... green light but black raster, they may be a problem on micro board, also, found that the 115 vset voltage was zero due to faulty mosfets on Buffer board 45pn15 (150V@45A) rdson 33miliOhms, replaced mosfets on top buffer board, lower biffer board disconnected yet still blank screen,with upper board connected
but the 115V is now there, I think there is a problem...