repairing a EBR73561701 EAX64232101 Zsus board

[goldbird78]

Hi All, I am attempting to repair 60pz750 zsus board and I am one 270 smd (27 ohm) gate resistor short for a FGPF4633 transistor, could I put a 150 (15 ohm) & 100 (10 ohm) in series to equal 25 ohms just for test purposes ? There are normally two 270 gate resistors in parallel per transistor so I would be putting this setup in parallel with one 270. Again just for a quick test until I get some 270's. Thx

[jetadm123]

Re: repairing a EBR73561701 EAX64232101 Zsus board

Well, you could put two 10 ohm in series, which will give you 20 ohms. And put two 15 ohm in parallel, which gives you 7.5 ohms. Combine the two in series for a total of 27.5 ohms.

[goldbird78]

Re: repairing a EBR73561701 EAX64232101 Zsus board bulb test

I think I may have successfully repaired this Zsus board. I am doing the bulb test right now and the TV has been on for 30 min with no issues, the bulbs are going from dim to approx 60% brightness at times. Is this normal or could there be another issue with the board. I replaced all 6 IGBT transistors, all gate resistors and the fuse. Attached are a couple pictures. Thx

[goldbird78]

Re: repairing a EBR73561701 EAX64232101 Zsus board

I took the bulbs out and wired direct and the TV ran great for about 1 hour and then the pictures started to look maldischarged and the TV started running very hot. I took a reading with my infared thermometer and the top of heatsink was well over 200F, when I shot it to where the transistors are it was over 300F. Anyone have any ideas ? Thx

[lookimback]

Re: repairing a EBR73561701 EAX64232101 Zsus board

Check the big inductors on both sustain boards for cracked solder joints. Not sure if that would be the problem, but it is a common problem on these boards.