Panasonic PT-L735

[asp]

Hi
   Can anyone please point me in the right direction for fixing my Panasonic projector? The Lamp was dead so I got a new one but it never started either, so I opened the power source and found 2 IGBTs that ware in short (Q9608 and Q9609 from the attached schematic). In reality Q9608 and Q9609 are 20J321 and I replaced them with GT20J341

   What I suspect might be bad as well is also Q9606 but for the life of me I can't find a 2SB0710 transistor (I know aliexpress has some but wouldn't want to wait 1 month for it to get here) so I ordered this one https://www.tme.eu/en/details/pmbt2907a.215/ PMBT2907A.215; should that be a good replacement? .

   What else should I look for? IGBT Driver? Some other parts? Thanks

[Armadillo]

Firstly, don't install the 2 IGBTs, you need to ensure that both bases are not high at same time.

A. Measure Voltage at IC9602 - Pin 4 wrt Pin 3 and Pin 7 and Pin 3, make sure both not high at same time.

B. Then, make sure T9604 are not fused/shorted. You have to take it out to ring test it.

If both pass, then install the IGBT and run it using series light bulb test.

Above my opinion, the way I would proceed it.

[asp]

Thanks Armadillo.
   Just an update...
   I tested and it seems D9608 is bad as well and I have no idea what to replace it with. On the package it's written M2W and it's a SOT-23. Any ideas?
   Q9608 is shortened between E and C and Q9609 between all 3 pins

[Armadillo]

MA720

Thanks Armadillo.
   Just an update...
   I tested and it seems D9608 is bad as well and I have no idea what to replace it with. On the packacke is writeen M2W and it's a SOT-23. Any ideas?
   Q9608 is shortened between E and C and Q9609 between all 3 pins

[Armadillo]

   Q9608 is shortened between E and C and Q9609 between all 3 pins

Alternatively, remove IC9602 and measure [Or remove any other shorts and measure]

Pin 6 and Pin 7 > 3 Kohm
Pin 4 and Pin 3 > 3 Kohm

[asp]

   Q9608 is shortened between E and C and Q9609 between all 3 pins

Alternatively, remove IC9602 and measure [Or remove any other shorts and measure]

Pin 6 and Pin 7 > 3 Kohm
Pin 4 and Pin 3 > 3 Kohm

6-7 ~ 6.2K
3-4 ~ 8.4K

[Armadillo]

With a short such like this, I would be surprise if R9601 or the fuse still survive.     

[asp]

With a short such like this, I would be surprise if R9601 or the fuse still survive.     

can't find any fuse except 2 main ones which are ok since the projector works except for the lamp powering on

R9601 seems to be doing quite well Anyway now I have to wait till 2nd of Jan to get the components and see if it works (i just hope PMBT2907A.215 is a good replacement for 2SB0710) thanks for the help

[asp]

After changing the IGBT’s (Q9608 and Q9609), the diode (D9608), transistor (Q9606) and IGBT controller (IC9602).... the proiector is alive...again.

I think what caused everything was D9608. I was not in short but had a lower than expected resistance (22ohms)

Thanks again for the help