Mag model 2600

[xtraelectronics]

Hi folks. Anyone got some pointers for this one? I temporarily replaced four of eight 100uf 35 volt caps. (the four remaining passed ESR with flying colours, but when I get get my parts order in all eight wil be replaced). I did this as a check to see if the problem persists. It apparantly does. The SMPS checks out ok. The monitor will still only flash once in a blue moon. All fuses ok. Nothing is noticably running hot, or burnt. There is a turn on signal from the "control" board. Good, stable 24 volts to the inverter. (normal for this monitor) Any ieas?

[xtraelectronics]

Re: Mag model 2600

Anybody? help pls

[PlainBill]

Re: Mag model 2600

Anybody? help pls

Patience is a virtue. Even those of us without a real life sometimes have obligations that prevent jumping right in with an answer.

What have you done between the first and second posts? Are the fuses good? Did you compare the voltages on the OZ960GK with the datasheet? Did you try substituting CCFLs? Did you search for a schematic? (OK, forget the schematic. I'd take a miracle to find one.)

PlainBill

[xtraelectronics]

Re: Mag model 2600

Didn't mean to sound impatient. Yes the fuses are all fine, as are the MOSFET drivers. I still must look up the IC datasheet. In the meantime I removed the mainboard and found many bad surface mount caps! I don't know if this will affect the inverter's operation, but looks like I will have to repair the mainboard, so I will need to order more caps. At that point I set it aside to persue other repairs. (A Sony receiver, and a JVC amplifier). I will devise a test scheme for the inverter board, and check it out with the datasheet next. Thanks, I'll keep you posted.

[370forlife]

Re: Mag model 2600

What kind of caps are those you used anyway?

[xtraelectronics]

Re: Mag model 2600

the caps I put on the board are ones I had here, branded EKM, all measured less than one on the esr meter. the reason for doing tis was to confirm if this was the only problem. I will be replacing all 8 with high quality low esr parts.

[PlainBill]

Re: Mag model 2600

Didn't mean to sound impatient. Yes the fuses are all fine, as are the MOSFET drivers. I still must look up the IC datasheet. In the meantime I removed the mainboard and found many bad surface mount caps! I don't know if this will affect the inverter's operation, but looks like I will have to repair the mainboard, so I will need to order more caps. At that point I set it aside to persue other repairs. (A Sony receiver, and a JVC amplifier). I will devise a test scheme for the inverter board, and check it out with the datasheet next. Thanks, I'll keep you posted.

It may be that replacing the bad caps on the main board will fix the problem. The 'flash only once in a blue moon' problem sounds more like a logic board (main board) problem than an inverter board problem.

PlainBill

[bullwinkle]

Re: Mag model 2600

Did you take out the MOSFETs (packaged like an IC)? Outboard tests are needed. OZ960GN rarely fails. If ok, go back to the supply board.

[xtraelectronics]

Re: Mag model 2600

thanks. will do that. (when I get time) got a road grader in here today for speakers.