5154 Problems and solutions

TIP 1:

IBM 5154 AND 5175 MONITORS

EGA (5154) and PGA (5175) monitors are nearly identical except for the
video electronics contained in a metal box on the left side (when
facing the screen). Schematics ARE available from IBM, in _Technical
Reference, Options and Adapters, Volume 3_ of the "Personal Computer
Hardware Reference Library." 

The most common failure is in the power supply: Symptoms include
chirping noise, repetitive startup/shutdown (blinking LED pilot lamp)
or jagged edges on left and right of picture.
Replace three small electrolytic capacitors in the power supply:
C11 (47uF 40v), C13 (10uF 35v) and C14 (1uF 35v). These capacitors
fail from heat after long service.

The power-supply unit is removable. You must drill-out three pop-
rivets to open the metal box; replace them with sheet-metal screws.

TIP 2:

Symptom: Vertical foldover in EGA mode, or incorrect vertical centering.
Replace C311 (100 uf 40v) near vertical amplifier (IC300)

In the ibm technical reference (link has been posted recently - I downloaded it) on page D-53, if that's the 5154 (I can't remember numbers) look at C315 (or it's equivalent) it's a 220uF 50V and it's in series with the vertical deflection coil - that would be the first component I'd look at! 

C315 if  the same monitor, should be idented on the board, it'll be near the (usually 4 way plug thingy) connections for the deflection coils, on the main board, all the same It will possibly show some bulging/leaking. 
And it's a good contender, having big AC currents flowing through it it's whole life. Look at the psu first, then that, then the vertical deflection drive chip

TIP 3:

According to my work notes (from the 80's), the two commonest failures that I saw in the 5154 were:
1. Power supply problem - replace C11 (47uf 35V electrolytic between C13 and C14).
2. Full or partial vertical collapse - replace TDA2653A.

I discarded my schematic years ago (I mean, who would still be using 5154's these days?)

When you do get a schematic, you'll see references throughout about mode 1/2.
Mode 1 is when the monitor is running at 15.75Khz (horr. scan freq).
Mode 2 is when the monitor is running at 21.85Khz.
In some areas of the schematic you'll see two potentiometers (pots) - one will be for mode 1 operation, and the other for mode 2.

Mode 2 is the normal mode of operation, however the CD4053 logic switches shown in the schematic are shown in their mode 1 position.