BUSH LED40127FHDCNTD, flashing LED'S

[finntricky]

Re: BUSH LED40127FHDCNTD, flashing LED'S

So the Boosted Voltage at the LED connector PL500 pin 1 and 5 steady?
And the Dimming control signal at connector PL201 pin 2 is also steady? Same for BL_ON/OFF pin 1? Same for +24V?

sorry budm, here are the readings from PL 500, H= high leds, L= low leds
pin 1, 81.7v H----- 75.7v L
pin 2, 0.7v H------ 8.9v L
pin 3, 0.7v H------ 6.8v L
pin 4, 0.0v H------ 0.0v L
pin 5, 81,8v H----- 75.6v L
pin 6, 0.7v H------ 10v L
pin 7, 0.6v H------ 7.5v L
all reading stay steady.

PL 200

pin
1, 0.0v
2, 0.0v
3, 3.3v
4, 3.3v
5, 3.3v
6, 23.8v
7, 12.1v
8, 12.1v
9, 5.4v
10, 5.4v
11, 12.1v
12, 5.5v
13, 0.0v
14, 3.3v
15, 0.0v
16, 3.2v
17, 0.0v
18, 0.0v
19, 0.0v
20, 23.9v
all readings taken at high leds,
the change in voltage when testing with low leds is pin 14 that drops from 3.3v to 2.7, and all readings are steady give or take .1

[finntricky]

Re: BUSH LED40127FHDCNTD, flashing LED'S

it looks like the SCH posted is not the same board, as my voltage readings dont really match on my PL200, and on SCH its PL201,
i dont know where to go from here apart from trying to get the IC for the power board, and even that dont match the SCH.

[budm]

Re: BUSH LED40127FHDCNTD, flashing LED'S

It is going to be tough if the SCH does not match the board.

[jczarniak]

Re: BUSH LED40127FHDCNTD, flashing LED'S

what tests have you done have you checked the voltage to each side of the tcon fuse etc.

Hi,
Thank you for support.
I've checked voltage on each side of the tcon fuse and I get 13.0-13.1 Volt.
I've checked also Voltages on power supply which looks alright.
What else can I check?
If main board is faulty can I buy any vestel 17mb95m for 40,42 or50"TV?
Thank you for help.

[ReeceyBurger123]

Re: BUSH LED40127FHDCNTD, flashing LED'S

Hi,
Thank you for support.
I've checked voltage on each side of the tcon fuse and I get 13.0-13.1 Volt.
I've checked also Voltages on power supply which looks alright.
What else can I check?
If main board is faulty can I buy any vestel 17mb95m for 40,42 or50"TV?
Thank you for help.

No you need the EXACT match for your model of Tv and screen used. If not it will not work.

[jczarniak]

Re: BUSH LED40127FHDCNTD, flashing LED'S

Thank you.
Is there any way to change the soft/configuration or do anything to the other main board to make it working with my TV/screen?

[vinceroger69]

Re: BUSH LED40127FHDCNTD, flashing LED'S

Thank you.
Is there any way to change the soft/configuration or do anything to the other main board to make it working with my TV/screen?

Ive just replied on your other thread maybe try to keep it all in one thread as we maybe replying to the wrong one which thread matches your tv make/model number this one or the other one?

[finntricky]

Re: BUSH LED40127FHDCNTD, flashing LED'S

just found the IC 501 LED driver, and ordered it, after close inspection it is the same IC thats on the SCH, TPS 61199,
ill let you know what happens when i replace it,

[finntricky]

Re: BUSH LED40127FHDCNTD, flashing LED'S

ok, this is the out come, its fucked, changed the IC and still the same result, so must be main board issue,
but it can still be used, as long as LEDs are set to high.
going to give up on this and move on to next tv.

[ReeceyBurger123]

Re: BUSH LED40127FHDCNTD, flashing LED'S

Why give up ? Why dont you force the driver on with a resistor ? Also if it works with BL on high why not just keep it at that ?

[finntricky]

Re: BUSH LED40127FHDCNTD, flashing LED'S

im useing with full back light, but cant really sell on unless i do it dirt cheap, so may just keep it for myself, and stick it in the spare room.

[satinser]

Re: BUSH LED40127FHDCNTD, flashing LED'S

Did you ever resolve this problem of flashing back light on lower backlight settings. Got exactly the same fault works on dynamic with no problem. Any other backlight setting and backlight starts flashing. Ive also ordered LED driver ic so hope I get better luck than you.

[satinser]

Re: BUSH LED40127FHDCNTD, flashing LED'S

I can report that my case fitting a replacement TPS61199 micro resolved the issue. No longer flashing on any backlight setting. I think we can safely assume that more like this will follow in the future. Another revenue stream!

[satinser]

Re: BUSH LED40127FHDCNTD, flashing LED'S

As a follow on to my last post. Afraid id didnt last long after 20mins it started flashing again.

[top204]

Re: BUSH LED40127FHDCNTD, flashing LED'S

I had a Bush TV that flashed with different settings in the menu for its backlight control, and it was one of the backlight LEDs faulty.

Taking the LCD panel off, and testing the LED strips with the PSU, showed one LED that was dim, but not off. This probably upset the control chip, which monitors the current feedback from the LEDs.

The higher the brightness sent to the LEDs, upset the PWM chip.

Replacing the LED cured the fault

[CoolJc]

Re: BUSH LED40127FHDCNTD, flashing LED'S

I have the same blinking problem with a JVC LT-40DG52J

Have we concluded it must be one of the leds breaking down?