In above laptop, inserting adapter only charging led lit, but pressing 'on' switch no power , no display, no leds at all. suspected mobo, disassembled. near dc jack, ic "max1907a etl" found, but can't find datasheet for it. checking offline, some power-mosfets nearer to ic(both sides of mobo) showed as shorted. but while removing cpu, those mosfets were found ok; checking with multimeter. I sent to repair-shop for cpu replacement. they said mobo must be replaced. not another option. please help me, please.
Satyapal M. H.
SOURCE: no video
You can try doing these:
Clearing the CMOS, i.e. Unplug power cord and take out battery, then put them back in.
Cross check the components such as heatsink/fan, video card, and processor. It is never good to have a heatsink with the fan not spinning.
Check to see if the heatsink is cold, warm or hot. It shouldn't be cold OR hot.
SOURCE: No Power on Sony TV
Be sure to use an ORIGINAL Sony transistor and be sure to resolder the pins of the small horizontal driver transformer and all parts connected to and around it, and your set should be fine.
SOURCE: Sony 2167 No power on
I have not worked on your particular model. But, I have serviced many TV sets over the years. My answer will ge generic.
Check all the capacitors in the horizontal output stage and power supply areas for high ESR. All the caps that are out of spec must be changed.
The high voltage multiplier & flyback can also cause the fault you are having.
You have to consider that the DC voltages are not the only important spec that has to be met. There are also many power drive signals that work with reactive devices. If there is any defect in the critical areas there will be failures.
Jerry G.
SOURCE: I have a Sony Vaio laptop model VGNFZ160E. It
This information my be a bit dated now but it makes interesting reading
http://www.physik.uni-freiburg.de/~zwerger/cip/Vaio/indexeng.htm
Testimonial: "It was interesting...this info applies to PCG-F series models (P3 Processor) and mine is an PCG-300 series model (Core 2 Duo Processor)...but thanks"
SOURCE: Sony Viao, won't power up
HELP! my sony viao made a little "click" sound and just died on me. What can this be? It's been having battery issues for a while now, and I have been charging it constantly. There is not light showing at all! not even the battery symbol. The adapter is showing a green light. can someone tell me if this is fixable and how much?
Thanks
Sam
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