Value of replacement for 6632L-0470A & 0471A inverter

[jbfr_54]

Hello,
As I am a new member from France, I am happy to join the forum which I often searched for technical advice on TV set repair.

I have a Philips 42PFL7662D with bad inverters. I changed the IC and the four Mosfets on the Master board but no progress, backlight still failing while slave board loks fine..

I found equivalent boards on sale in different locations for a reasonable price.

These are 6632L-0535A and 0535B, advertised as equivalent in size, screw holes and power but cable locations seem different.

As anyone had experience with these new boards ? Any advice ?

Thanks in advance for your support.

Happy New Year

Jean

[tom66]

Re: Value of replacement for 6632L-0470A & 0471A inverter

An inverter is an inverter. In the vast majority of cases, if the power connector and output connectors are the same, it will work…

[Dgtech]

Re: Value of replacement for 6632L-0470A & 0471A inverter

I have a Philips 42PFL7662D with bad inverters. I changed the IC and the four Mosfets on the Master board but no progress, backlight still failing while slave board loks fine..

I'm confused as to why you would first consider the inverters to be bad?? What are the symptoms? You say that the IC and the mosfets were changed out on the master but not the slave. Once again... what made you do this? Resistance readings??

Check my post here: https://www.badcaps.net/forum/showpo...4&postcount=29

Follow the instructions for testing both boards and post your results.

[jbfr_54]

Re: Value of replacement for 6632L-0470A & 0471A inverter

In the meantime I found my problem, in fact the BD9897 IC (brand new) was bad, I probably blew it up when soldering. When testing the Master board, I short circuited pins 28 and 29 resulting in a Zener blown (placed on pin 28 of the IC and GND).
I replace again the BD9897 and placed a 6,2v Zener (forgot the diode identification on PCB but it's a SMD Zener marked E2 which semms to be 6.2 volts (it's placed between pin 28 REG and ground). Checked everything again and powered the TV !
The Master PCB shows a blue LED on for a couple of seconds, then off, then I hear a little "tick" noise from the PCB and at the same time the backlight flashes shortly, then a few seconds later the blue LED comes on again and finally the backlight switches ON.

This "two steps" cycle to turn on the backlight occurs each time I turn on the TV and I wonder if it is normal. Does anyone knows about this ?

I have 6.2 volts on the REG pin of the BD9897. Is this the normal voltage, I expected 5.5 to 6 volts according to datasheet) ?

Next step, I will apply the recommended modifications of the circuit !

Thaks in advance for your help.
Jean