plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

[klein]

good morning

i have acquired two tv's (plv16190)

one comes on and when hooked to a computer works sometimes other times the screen is distorted like the controller has a memory chip problem like the old video cards use to do after they have been over heated.

the second one has the red power light and when you push the power button the power light blinks but the tv doesn't come on.

these are cheep off brand sold cheep on black Friday specials. i'm thinking that both are bad controller cards and the psu's are fine no sings of bad caps, the psu has 12v coming out, there are two more connections marked dim and blk does any one know how i could light up the screen with out the controller board i'm assuming the dim and blk is what turns on the lights i find no voltage on those pins. should i apply 12v or 5v etc...........?

connector psu to control board
12v
12v
12v
gnd
gnd
gnd
dim
blk

psu board has the cathode connection

i have found a controller board that should work to make this tv a monitor

[Rtech]

Re: plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

Suspect that the 'blk' means Backlight and if you put a 1k resistor between 5v and and that pin,that should turn the lamps on.

[budm]

Re: plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

Measure the DC voltage at the BLK pin when the monitor is plugged in but not turn on, and when the monitor is ON, I expect to see around 0V when the monitor is off, and >3v when moniotor is ON.

[klein]

Re: plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

i only have one of the tv's disassembled right now and it is the one that doesn't come on at all, so i hunted around on the controller board until i found 3.27v and jumped it to blk and the lights lit thank you all for your help.

[budm]

Re: plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

That means there is problem on the main board, next step will be checking the voltages and voltages regulators to see if they are putting out the correct voltages.

[klein]

Re: plv16190 wont turn on, Power Supply LS1904006a-w08 ver 1.0

i'm not going any further with the repair, i striped down the lcd and maid a computer monitor out of it.

would it be possible to use the cclf inverter to check other screens ? also this psu/cclf unit is for a 19 inch screen will it check a 22 inch?

the psu puts out 12v can i just resistor it to 3.3v to turn on the cclf tubes for testing?