Mulja tv repair portal
Equipment Repairs => PLASMA TV forum => Topic started by: rebel-mc on July 13, 2012,15:11:21
-
Hi, Got one of these in for repair and just can't establish where the fault is. Power up tv the standby light goes from red to green then after 5 seconds back to red.
So far ive tested all voltages from power supply and everything is there (or at least for 5 seconds). +5v standby allways there. Power supply comes on for 5 seconds (relay click) and all voltages there, after 5 seconds all I have is the +5v standby. On the power supply there are only two power outs (ysus and Mainboard). If I disconnect the Ysus the same thing happens. If I disconnect the mainboard the same. If I disconnect both the power supply stays on. Anyone had any experience with this fault. I believe the same fault can occur on the 42PG2000 and 42PG3000. I was thinking the ysus but just can't prove it.
Again any help would be appriciated.
Thanks
-
Chassis PD83A
On PSU change capacitors and check (with hot air) IC U701(MC80F0604B P)
-
Hi Jordan, thanks for the advice. I've tested most of the caps and all seem to be ok. How would I go about testing u701?
Thanks
-
Warm up him with hair dryer
-
Right tried the hairdryer on IC U701 and this is what I get.
After the ic has been heated for 5 mins, I switched the tv on and the only difference was on the LVDS board the two right leds come on for 5 seconds (there are three in a row). When the ic has been left to cool the two leds on the left come on for 5 seconds. Tv' still just shuts down after 5 seconds. Front standby light green to red.
Still as clear as mud.
Any advice.
-
Hi Think I have found it. On the ysus there are three transistors all reading short. Part Num 45f123. sgs thompson part.
Anyone know where I could get them from?