alba 32" hd lcd

[sienoki]

Hi guys n gals..my neighbour was throwing this lcd out so i took to have a look at..dont know the model no as the sticker is half ripped off..it was from argos 2yrs ago..its 32" with 1 hdmi port and 2 scart sockets..all the ones ive been looking at only have 1 scart..this has 2 scarts with power buttons etc on the side of the tv so im stuck on the model..

Anyways the problem was blue led flashing no picture or sound or backlight..opened it up to find 4 caps bulged..the psu model no is (17PW20)..2x50v100uf where the L shaped heatsink is and 2x6.3v4700uf..replaced with same values and the blue led light is now steady on but still no backlight..picture or sound

I dont know what to check now and ..thx
Ive downloaded psu schematics but i dont know how to follow it

[tom66]

Re: alba 32" hd lcd

Vestel? They are well known to me, unfortunately for me. The Lada of the TV world.

Your problem is most likely the two 15n caps near the top of the transformer, between the MOSFET heatsink. They are usually blue cuboids (film cap) or red dipped film caps.

Check the output voltages, a common symptom when these go bad are low output voltages. Like 24V measuring around 15V.

[sienoki]

Re: alba 32" hd lcd

Vestel? They are well known to me, unfortunately for me. The Lada of the TV world.

Your problem is most likely the two 15n caps near the top of the transformer, between the MOSFET heatsink. They are usually blue cuboids (film cap) or red dipped film caps.

Check the output voltages, a common symptom when these go bad are low output voltages. Like 24V measuring around 15V.

Can i take the psu off the tv apply the power and take readings of them 2 blue cuboids from underneath..is this safe to do so..thx..am i setting my multimeter to 20v and taking a reading..thx

[tom66]

Re: alba 32" hd lcd

Can i take the psu off the tv apply the power and take readings of them 2 blue cuboids from underneath..is this safe to do so..thx

No need to. The caps usually bulge when failed, but should be replaced anyway. There are repair kits on eBay.

The voltages are usually only low when a load such as the inverter or main board is connected, they may be fine with no load. You can probe the voltages by sticking the black probe in an exposed screw hole on the TV and by pressing the red probe into the connector pin. If they are normal, then the PSU is likely fine. If they are low, then something's probably wrong with the PSU. If they are not there at all, it could be the PSU but it could also be the main board not switching on the outputs or a shorted load.

[sienoki]

Re: alba 32" hd lcd

No need to. The caps usually bulge when failed, but should be replaced anyway. There are repair kits on eBay.

The voltages are usually only low when a load such as the inverter or main board is connected, they may be fine with no load. You can probe the voltages by sticking the black probe in an exposed screw hole on the TV and by pressing the red probe into the connector pin. If they are normal, then the PSU is likely fine. If they are low, then something's probably wrong with the PSU. If they are not there at all, it could be the PSU but it could also be the main board not switching on the outputs or a shorted load.

Thx tom ive ordered a repair kit & will report bk..thx

[sienoki]

Re: alba 32" hd lcd

Thx tom ive ordered a repair kit & will report bk..thx

Repair kit worked a treattom tv perfect but i could do with getting a remote for it..as i dont know model no i not sure if similar alba 32" lcd remotes will work..my set has 2 scarts..1 hdmi port..channel buttons etc on right down the side..she got it from argos & i dont want to purchase a remote that will not work....thx guys n gals

[tom66]

Re: alba 32" hd lcd

Repair kit worked a treattom tv perfect but i could do with getting a remote for it..as i dont know model no i not sure if similar alba 32" lcd remotes will work..my set has 2 scarts..1 hdmi port..channel buttons etc on right down the side..she got it from argos & i dont want to purchase a remote that will not work....thx guys n gals

What's the model on the motherboard? (17MB20?)

[sienoki]

Re: alba 32" hd lcd

What's the model on the motherboard? (17MB20?)

model no 17PW20 on psu

[tom66]

Re: alba 32" hd lcd

model no 17PW20 on psu

Anything on motherboard?

[sienoki]

Re: alba 32" hd lcd

Anything on motherboard?

mb no is 17MB12-3...v2...110608
on the back cover itself is tft 32760..thx

[tom66]

Re: alba 32" hd lcd

Your best bet is to find what other TVs that motherboard is used in, and seeing if they have remote controls for sale on eBay.

[sienoki]

Re: alba 32" hd lcd

Your best bet is to find what other TVs that motherboard is used in, and seeing if they have remote controls for sale on eBay.

My neighbour brought 1 up from a 15" lcd with freeview & that works fine so i will look up that model & get a replacement

[bbjunkie]

Re: alba 32" hd lcd

Congratulations on a successful repair

[sienoki]

Re: alba 32" hd lcd

Congratulations on a successful repair

thx fella..im finding allot of info from this great site..im a long way of understanding electronics but im willing to learn..totally stuck on this lcd 1908 though..thx