Samsung LE32A336J1D backlight won't turn on

[sequille]

It doesn't flash on and then off, the CFLs simply don't turn on at all. I tested them individually with a one lamp inverter, they all turn on, but only 2/3 of the length (maybe not strong enough inverter?). When they do, I see the image too.

I measured the voltages going into the inverter board:

E_PWM = 3.80

I_PWM = 2.47

BLON = 5.21

VBL = 24.1


What other tests should I run at this point?

[budm]

Re: Samsung LE32A336J1D backlight won't turn on

https://www.badcaps.net/forum/showthread.php?t=39740
So far the Voltage readings are correct.

[PAKSUM]

Re: Samsung LE32A336J1D backlight won't turn on

first check "fuse" on inverter board

[sequille]

Re: Samsung LE32A336J1D backlight won't turn on

I checked the fuses, they are OK. Until i can get some pictures of it (3Mp camera that i have won't do it) here's a list of the chips on the board:

12 * 4614
10393
BA2902F
OZ964GN

The board is CMO T87I029.14


Since there is no visually identifiable damage, maybe a picture of the product from an online store would help.

I found a burnt fuse, F1, 0.75A 76V. Shops are closed for the day but in the meantime, what could have cause it to burn? If I replace it will it just burn again?

[budm]

Re: Samsung LE32A336J1D backlight won't turn on

That black fuse is the common failure on CMO inverter board, I use pico fuse for replacement, you just have to bend the legs to fit and no need to remove the old fuse. I replaced more than 30 of these fuses on CMO Inverter board. So far non of my repair works come back due to the same fuse, so new fuse should take care of the problem. BTW, the fuse is for supplying the voltage to run the PWM IC.

[sequille]

Re: Samsung LE32A336J1D backlight won't turn on

Wow, thank you! It's so good to know that it's a known issue. The smallest one i could find was 1.25A 250V. The seller seemed confident it's OK to use. Should i go ahead and put it in or try to find another one?

[budm]

Re: Samsung LE32A336J1D backlight won't turn on

You can use that 1.25A for testing.