Philips 32PF7320A/37 won't turn on, 7 blinks

[cammac725]

Hi

I've got this Philips 32PF7320A/37 TV that was given to me. When the power cord is plugged in, nothing happens for about five seconds then I hear a click and the power light starts blinking 7 times repeatedly. I have been unable to find out what that blink code is for this model.

I looked at the boards but see no caps that look bad. I replaced all the caps on the power board with Nichicon caps...no joy.

The "click" I hear when plugging it in comes from the component circled in pic 1, and I have tested the 2 fuses indicated in pic 1, they are good. (I hope the pics are good enough. The board is 15" long so I split the pics.)

I don't know where to go from here. Any help would be appreciated.

Cam

[Mr Bill]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

Is Ic7001 MC34067P? Can't tell from 100% from the pictures. If it is Check Pin 4 (ground) to Pin 15 (Vcc) and see if it's shorted.

[cammac725]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

Thanks, Mr Bill

yes, it is MC34067P.

With board isolated, pin 4 to pin 15 is open.

With board installed, pin 15 to chassis gnd is 20v, while LED blinks 7x.
When power applied, pin 15 to pin 4 is 15v, which drops slowly to 1.5v after shutdown.

[budm]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

Is there a chassis number on the model number sticker on the back of the TV?

[cammac725]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

Chassis number is BL2.3U AA

[cammac725]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

Well, I ended up replacing the power board because it looks like I damaged the board when replacing one of the caps, but I still have the exact same problem. Voltages are still the same also.

[Shane711]

Re: Philips 32PF7320A/37 won't turn on, 7 blinks

I have this TV and I have narrowed the problem down to the scaler board. I am not sure if it can be repaired. It seems it is an overheating issue or the bad component is getting too hot. If I put a fan across the circuits the TV stays on. I am not sure if it will be a good idea to get another scaler board unless I can figure out how to prevent it from going bad. I am thinking maybe a heat sink on the main IC. Even a square copper block tall enough to reach the top cover with heat paste on both ends might do the trick.

It seems to me this TV is not worth fixing so I think I am going to disassemble it and put the panel on eBay for sale.