celcus lcd40s913fhd flashing red light

[shaunbt123]

Hi there can someone help,im having look at this tv for a friend the problem is the red led on the front panel just flashes continuously,i have replaced the psu but the problem remains,there is 5v on the av board fuse and also there is 24v on the inverter fuse,could it possibly be the mainboard thats gone.
thanks for your help.

[munirutech]

Re: celcus lcd40s913fhd flashing red light

yeah i thing you have a problem with the main board

[munirutech]

Re: celcus lcd40s913fhd flashing red light

try to check the voltage regulators on the board

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

just incase its of any use to anyone the psu is a vestel 17pw26-5
and the mainboard is a vestel 17mb65s-3

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

I have taken some voltage readings from the connector pl816 of the power supply which goes to the av board,the voltages which are circled are with the mainboard disconnected,i have two missing voltages the 33v and the 24v all the others seem ok .

[selldoor]

Re: celcus lcd40s913fhd flashing red light

Stunning combination vestel power supply AND main !!
Can you post some pictures - as already said test VRs
Is this LEDLIT panel

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

ill try and post some pics of the mainboard and the psu ,could show me the points which i need to test.

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

sorry but best i can do with my cameraphone.

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

i have measured three voltage regulators on the mainboard they look like all are ajustable voltage regs here is what i measured

lda1117
pin1----6.58v
pin2----7.84v
pin3----11.92v

ld1117
pin1---2.1v
pin2---3.3v
pin3---5.1v

ld1117
pin1---0.5v
pin2---1.8v
pin3---3.3v

hope someone can tellme if these are ok.
thanks for your help.

[tom66]

Re: celcus lcd40s913fhd flashing red light

First one looks a little off - can you retest.

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

thanks for your help tom,i have retested it and the readings are exactly the same.
also tom i have found a component which is an b240a which according to data sheet is a schotty barrier rectifier which is showing short circuit could this be anything to do with the problem

[vinceroger69]

Re: celcus lcd40s913fhd flashing red light

can you lift one side of the diode and retest as some times diodes in circuit show sc or pictures of the diode in question so we can see the circuit around it.

[tom66]

Re: celcus lcd40s913fhd flashing red light

Upon looking at the readings again, it looks OK because voltage between OUT (2) and ADJ (1) is approx 1.2V.

Flashing red light on a Vestel chassis means one of two things:
- A monitored rail voltage is missing
- Bad/corrupted firmware

Main b/d schematic


Can you see test point TP217 or capacitor C734?

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

thanks tom and vinceroger 69 i will lift the smd diode later and get back to you with results as i have to go to work now

[shaunbt123]

Re: celcus lcd40s913fhd flashing red light

hi tom this is the manual i have found for the mainboard ,as the link you sent me would not open when i download it.i have found c734 its part of the protection circuit.

[vinceroger69]

Re: celcus lcd40s913fhd flashing red light

the link works ok in firefox.

[Tc1986]

Re: celcus lcd40s913fhd flashing red light

Hi, just found this thread when troubleshooting my celcus dled40125fhd

Had red light flashing as normal, but power on produced no picture.

Found out the problem: I connected the TV to a wall bracket so unscrewed the Base mount. I don't like bags of screws lying around so screwed the Base mount screws back in to the housing. Without the thickness of the Base mount, the screws actually pressed against the t-con causing problems. One of the diodes named cd6 fell out when I touched it, and suddenly the TV worked again!

Bad design but at least it's working now!!

[Shotgun25]

Re: celcus lcd40s913fhd flashing red light

Just wanted to say that the service manual posted above for the vestel board 17MB65-2 in a Celcus TV fixed a no audio from internal speakers, but sound from headphones issue.

No audio fix instructions below.

Turn TV on
Press menu
Type 4725
Type 4725 again
Service Menu appears
Open Diagnostic
Select factory reset
Press OK
Wait approximately 2mins
Accept 'first run' options
Tune any channels or switch to your desired source
Test sound works

I suspect this is only a temporary fix, there may be some hardware that is aging, but the fix can be applied as many times as it works